/* $NetBSD: pmap.c,v 1.272 2014/03/30 15:55:08 matt Exp $ */ /* * Copyright 2003 Wasabi Systems, Inc. * All rights reserved. * * Written by Steve C. Woodford for Wasabi Systems, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project by * Wasabi Systems, Inc. * 4. The name of Wasabi Systems, Inc. may not be used to endorse * or promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 2002-2003 Wasabi Systems, Inc. * Copyright (c) 2001 Richard Earnshaw * Copyright (c) 2001-2002 Christopher Gilbert * All rights reserved. * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the company nor the name of the author may be used to * endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /*- * Copyright (c) 1999 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1994-1998 Mark Brinicombe. * Copyright (c) 1994 Brini. * All rights reserved. * * This code is derived from software written for Brini by Mark Brinicombe * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Mark Brinicombe. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * * RiscBSD kernel project * * pmap.c * * Machine dependent vm stuff * * Created : 20/09/94 */ /* * armv6 and VIPT cache support by 3am Software Foundry, * Copyright (c) 2007 Microsoft */ /* * Performance improvements, UVM changes, overhauls and part-rewrites * were contributed by Neil A. Carson . */ /* * Overhauled again to speedup the pmap, use MMU Domains so that L1 tables * can be shared, and re-work the KVM layout, by Steve Woodford of Wasabi * Systems, Inc. * * There are still a few things outstanding at this time: * * - There are some unresolved issues for MP systems: * * o The L1 metadata needs a lock, or more specifically, some places * need to acquire an exclusive lock when modifying L1 translation * table entries. * * o When one cpu modifies an L1 entry, and that L1 table is also * being used by another cpu, then the latter will need to be told * that a tlb invalidation may be necessary. (But only if the old * domain number in the L1 entry being over-written is currently * the active domain on that cpu). I guess there are lots more tlb * shootdown issues too... * * o If the vector_page is at 0x00000000 instead of in kernel VA space, * then MP systems will lose big-time because of the MMU domain hack. * The only way this can be solved (apart from moving the vector * page to 0xffff0000) is to reserve the first 1MB of user address * space for kernel use only. This would require re-linking all * applications so that the text section starts above this 1MB * boundary. * * o Tracking which VM space is resident in the cache/tlb has not yet * been implemented for MP systems. * * o Finally, there is a pathological condition where two cpus running * two separate processes (not lwps) which happen to share an L1 * can get into a fight over one or more L1 entries. This will result * in a significant slow-down if both processes are in tight loops. */ /* * Special compilation symbols * PMAP_DEBUG - Build in pmap_debug_level code */ /* Include header files */ #include "opt_cpuoptions.h" #include "opt_pmap_debug.h" #include "opt_ddb.h" #include "opt_lockdebug.h" #include "opt_multiprocessor.h" #ifdef MULTIPROCESSOR #define _INTR_PRIVATE #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include //#include __KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.272 2014/03/30 15:55:08 matt Exp $"); //#define PMAP_DEBUG #ifdef PMAP_DEBUG /* XXX need to get rid of all refs to this */ int pmap_debug_level = 0; /* * for switching to potentially finer grained debugging */ #define PDB_FOLLOW 0x0001 #define PDB_INIT 0x0002 #define PDB_ENTER 0x0004 #define PDB_REMOVE 0x0008 #define PDB_CREATE 0x0010 #define PDB_PTPAGE 0x0020 #define PDB_GROWKERN 0x0040 #define PDB_BITS 0x0080 #define PDB_COLLECT 0x0100 #define PDB_PROTECT 0x0200 #define PDB_MAP_L1 0x0400 #define PDB_BOOTSTRAP 0x1000 #define PDB_PARANOIA 0x2000 #define PDB_WIRING 0x4000 #define PDB_PVDUMP 0x8000 #define PDB_VAC 0x10000 #define PDB_KENTER 0x20000 #define PDB_KREMOVE 0x40000 #define PDB_EXEC 0x80000 int debugmap = 1; int pmapdebug = 0; #define NPDEBUG(_lev_,_stat_) \ if (pmapdebug & (_lev_)) \ ((_stat_)) #else /* PMAP_DEBUG */ #define NPDEBUG(_lev_,_stat_) /* Nothing */ #endif /* PMAP_DEBUG */ /* * pmap_kernel() points here */ static struct pmap kernel_pmap_store = { #ifndef ARM_MMU_EXTENDED .pm_activated = true, .pm_domain = PMAP_DOMAIN_KERNEL, .pm_cstate.cs_all = PMAP_CACHE_STATE_ALL, #endif }; struct pmap * const kernel_pmap_ptr = &kernel_pmap_store; #undef pmap_kernel #define pmap_kernel() (&kernel_pmap_store) #ifdef PMAP_NEED_ALLOC_POOLPAGE int arm_poolpage_vmfreelist = VM_FREELIST_DEFAULT; #endif /* * Pool and cache that pmap structures are allocated from. * We use a cache to avoid clearing the pm_l2[] array (1KB) * in pmap_create(). */ static struct pool_cache pmap_cache; static LIST_HEAD(, pmap) pmap_pmaps; /* * Pool of PV structures */ static struct pool pmap_pv_pool; static void *pmap_bootstrap_pv_page_alloc(struct pool *, int); static void pmap_bootstrap_pv_page_free(struct pool *, void *); static struct pool_allocator pmap_bootstrap_pv_allocator = { pmap_bootstrap_pv_page_alloc, pmap_bootstrap_pv_page_free }; /* * Pool and cache of l2_dtable structures. * We use a cache to avoid clearing the structures when they're * allocated. (196 bytes) */ static struct pool_cache pmap_l2dtable_cache; static vaddr_t pmap_kernel_l2dtable_kva; /* * Pool and cache of L2 page descriptors. * We use a cache to avoid clearing the descriptor table * when they're allocated. (1KB) */ static struct pool_cache pmap_l2ptp_cache; static vaddr_t pmap_kernel_l2ptp_kva; static paddr_t pmap_kernel_l2ptp_phys; #ifdef PMAPCOUNTERS #define PMAP_EVCNT_INITIALIZER(name) \ EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "pmap", name) #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) static struct evcnt pmap_ev_vac_clean_one = PMAP_EVCNT_INITIALIZER("clean page (1 color)"); static struct evcnt pmap_ev_vac_flush_one = PMAP_EVCNT_INITIALIZER("flush page (1 color)"); static struct evcnt pmap_ev_vac_flush_lots = PMAP_EVCNT_INITIALIZER("flush page (2+ colors)"); static struct evcnt pmap_ev_vac_flush_lots2 = PMAP_EVCNT_INITIALIZER("flush page (2+ colors, kmpage)"); EVCNT_ATTACH_STATIC(pmap_ev_vac_clean_one); EVCNT_ATTACH_STATIC(pmap_ev_vac_flush_one); EVCNT_ATTACH_STATIC(pmap_ev_vac_flush_lots); EVCNT_ATTACH_STATIC(pmap_ev_vac_flush_lots2); static struct evcnt pmap_ev_vac_color_new = PMAP_EVCNT_INITIALIZER("new page color"); static struct evcnt pmap_ev_vac_color_reuse = PMAP_EVCNT_INITIALIZER("ok first page color"); static struct evcnt pmap_ev_vac_color_ok = PMAP_EVCNT_INITIALIZER("ok page color"); static struct evcnt pmap_ev_vac_color_blind = PMAP_EVCNT_INITIALIZER("blind page color"); static struct evcnt pmap_ev_vac_color_change = PMAP_EVCNT_INITIALIZER("change page color"); static struct evcnt pmap_ev_vac_color_erase = PMAP_EVCNT_INITIALIZER("erase page color"); static struct evcnt pmap_ev_vac_color_none = PMAP_EVCNT_INITIALIZER("no page color"); static struct evcnt pmap_ev_vac_color_restore = PMAP_EVCNT_INITIALIZER("restore page color"); EVCNT_ATTACH_STATIC(pmap_ev_vac_color_new); EVCNT_ATTACH_STATIC(pmap_ev_vac_color_reuse); EVCNT_ATTACH_STATIC(pmap_ev_vac_color_ok); EVCNT_ATTACH_STATIC(pmap_ev_vac_color_blind); EVCNT_ATTACH_STATIC(pmap_ev_vac_color_change); EVCNT_ATTACH_STATIC(pmap_ev_vac_color_erase); EVCNT_ATTACH_STATIC(pmap_ev_vac_color_none); EVCNT_ATTACH_STATIC(pmap_ev_vac_color_restore); #endif static struct evcnt pmap_ev_mappings = PMAP_EVCNT_INITIALIZER("pages mapped"); static struct evcnt pmap_ev_unmappings = PMAP_EVCNT_INITIALIZER("pages unmapped"); static struct evcnt pmap_ev_remappings = PMAP_EVCNT_INITIALIZER("pages remapped"); EVCNT_ATTACH_STATIC(pmap_ev_mappings); EVCNT_ATTACH_STATIC(pmap_ev_unmappings); EVCNT_ATTACH_STATIC(pmap_ev_remappings); static struct evcnt pmap_ev_kernel_mappings = PMAP_EVCNT_INITIALIZER("kernel pages mapped"); static struct evcnt pmap_ev_kernel_unmappings = PMAP_EVCNT_INITIALIZER("kernel pages unmapped"); static struct evcnt pmap_ev_kernel_remappings = PMAP_EVCNT_INITIALIZER("kernel pages remapped"); EVCNT_ATTACH_STATIC(pmap_ev_kernel_mappings); EVCNT_ATTACH_STATIC(pmap_ev_kernel_unmappings); EVCNT_ATTACH_STATIC(pmap_ev_kernel_remappings); static struct evcnt pmap_ev_kenter_mappings = PMAP_EVCNT_INITIALIZER("kenter pages mapped"); static struct evcnt pmap_ev_kenter_unmappings = PMAP_EVCNT_INITIALIZER("kenter pages unmapped"); static struct evcnt pmap_ev_kenter_remappings = PMAP_EVCNT_INITIALIZER("kenter pages remapped"); static struct evcnt pmap_ev_pt_mappings = PMAP_EVCNT_INITIALIZER("page table pages mapped"); EVCNT_ATTACH_STATIC(pmap_ev_kenter_mappings); EVCNT_ATTACH_STATIC(pmap_ev_kenter_unmappings); EVCNT_ATTACH_STATIC(pmap_ev_kenter_remappings); EVCNT_ATTACH_STATIC(pmap_ev_pt_mappings); static struct evcnt pmap_ev_fixup_mod = PMAP_EVCNT_INITIALIZER("page modification emulations"); static struct evcnt pmap_ev_fixup_ref = PMAP_EVCNT_INITIALIZER("page reference emulations"); static struct evcnt pmap_ev_fixup_exec = PMAP_EVCNT_INITIALIZER("exec pages fixed up"); static struct evcnt pmap_ev_fixup_pdes = PMAP_EVCNT_INITIALIZER("pdes fixed up"); #ifndef ARM_MMU_EXTENDED static struct evcnt pmap_ev_fixup_ptesync = PMAP_EVCNT_INITIALIZER("ptesync fixed"); #endif EVCNT_ATTACH_STATIC(pmap_ev_fixup_mod); EVCNT_ATTACH_STATIC(pmap_ev_fixup_ref); EVCNT_ATTACH_STATIC(pmap_ev_fixup_exec); EVCNT_ATTACH_STATIC(pmap_ev_fixup_pdes); #ifndef ARM_MMU_EXTENDED EVCNT_ATTACH_STATIC(pmap_ev_fixup_ptesync); #endif #ifdef PMAP_CACHE_VIPT static struct evcnt pmap_ev_exec_mappings = PMAP_EVCNT_INITIALIZER("exec pages mapped"); static struct evcnt pmap_ev_exec_cached = PMAP_EVCNT_INITIALIZER("exec pages cached"); EVCNT_ATTACH_STATIC(pmap_ev_exec_mappings); EVCNT_ATTACH_STATIC(pmap_ev_exec_cached); static struct evcnt pmap_ev_exec_synced = PMAP_EVCNT_INITIALIZER("exec pages synced"); #ifndef ARM_MMU_EXTENDED static struct evcnt pmap_ev_exec_synced_map = PMAP_EVCNT_INITIALIZER("exec pages synced (MP)"); static struct evcnt pmap_ev_exec_synced_unmap = PMAP_EVCNT_INITIALIZER("exec pages synced (UM)"); static struct evcnt pmap_ev_exec_synced_remap = PMAP_EVCNT_INITIALIZER("exec pages synced (RM)"); static struct evcnt pmap_ev_exec_synced_clearbit = PMAP_EVCNT_INITIALIZER("exec pages synced (DG)"); static struct evcnt pmap_ev_exec_synced_kremove = PMAP_EVCNT_INITIALIZER("exec pages synced (KU)"); #endif EVCNT_ATTACH_STATIC(pmap_ev_exec_synced); #ifndef ARM_MMU_EXTENDED EVCNT_ATTACH_STATIC(pmap_ev_exec_synced_map); EVCNT_ATTACH_STATIC(pmap_ev_exec_synced_unmap); EVCNT_ATTACH_STATIC(pmap_ev_exec_synced_remap); EVCNT_ATTACH_STATIC(pmap_ev_exec_synced_clearbit); EVCNT_ATTACH_STATIC(pmap_ev_exec_synced_kremove); #endif static struct evcnt pmap_ev_exec_discarded_unmap = PMAP_EVCNT_INITIALIZER("exec pages discarded (UM)"); static struct evcnt pmap_ev_exec_discarded_zero = PMAP_EVCNT_INITIALIZER("exec pages discarded (ZP)"); static struct evcnt pmap_ev_exec_discarded_copy = PMAP_EVCNT_INITIALIZER("exec pages discarded (CP)"); static struct evcnt pmap_ev_exec_discarded_page_protect = PMAP_EVCNT_INITIALIZER("exec pages discarded (PP)"); static struct evcnt pmap_ev_exec_discarded_clearbit = PMAP_EVCNT_INITIALIZER("exec pages discarded (DG)"); static struct evcnt pmap_ev_exec_discarded_kremove = PMAP_EVCNT_INITIALIZER("exec pages discarded (KU)"); #ifdef ARM_MMU_EXTENDED static struct evcnt pmap_ev_exec_discarded_modfixup = PMAP_EVCNT_INITIALIZER("exec pages discarded (MF)"); #endif EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_unmap); EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_zero); EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_copy); EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_page_protect); EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_clearbit); EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_kremove); #ifdef ARM_MMU_EXTENDED EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_modfixup); #endif #endif /* PMAP_CACHE_VIPT */ static struct evcnt pmap_ev_updates = PMAP_EVCNT_INITIALIZER("updates"); static struct evcnt pmap_ev_collects = PMAP_EVCNT_INITIALIZER("collects"); static struct evcnt pmap_ev_activations = PMAP_EVCNT_INITIALIZER("activations"); EVCNT_ATTACH_STATIC(pmap_ev_updates); EVCNT_ATTACH_STATIC(pmap_ev_collects); EVCNT_ATTACH_STATIC(pmap_ev_activations); #define PMAPCOUNT(x) ((void)(pmap_ev_##x.ev_count++)) #else #define PMAPCOUNT(x) ((void)0) #endif /* * pmap copy/zero page, and mem(5) hook point */ static pt_entry_t *csrc_pte, *cdst_pte; static vaddr_t csrcp, cdstp; #ifdef MULTIPROCESSOR static size_t cnptes; #define cpu_csrc_pte(o) (csrc_pte + cnptes * cpu_number() + ((o) >> L2_S_SHIFT)) #define cpu_cdst_pte(o) (cdst_pte + cnptes * cpu_number() + ((o) >> L2_S_SHIFT)) #define cpu_csrcp(o) (csrcp + L2_S_SIZE * cnptes * cpu_number() + (o)) #define cpu_cdstp(o) (cdstp + L2_S_SIZE * cnptes * cpu_number() + (o)) #else #define cpu_csrc_pte(o) (csrc_pte + ((o) >> L2_S_SHIFT)) #define cpu_cdst_pte(o) (cdst_pte + ((o) >> L2_S_SHIFT)) #define cpu_csrcp(o) (csrcp + (o)) #define cpu_cdstp(o) (cdstp + (o)) #endif vaddr_t memhook; /* used by mem.c & others */ kmutex_t memlock __cacheline_aligned; /* used by mem.c & others */ kmutex_t pmap_lock __cacheline_aligned; extern void *msgbufaddr; int pmap_kmpages; /* * Flag to indicate if pmap_init() has done its thing */ bool pmap_initialized; /* * Misc. locking data structures */ static inline void pmap_acquire_pmap_lock(pmap_t pm) { if (pm == pmap_kernel()) { #ifdef MULTIPROCESSOR KERNEL_LOCK(1, NULL); #endif } else { mutex_enter(pm->pm_lock); } } static inline void pmap_release_pmap_lock(pmap_t pm) { if (pm == pmap_kernel()) { #ifdef MULTIPROCESSOR KERNEL_UNLOCK_ONE(NULL); #endif } else { mutex_exit(pm->pm_lock); } } static inline void pmap_acquire_page_lock(struct vm_page_md *md) { mutex_enter(&pmap_lock); } static inline void pmap_release_page_lock(struct vm_page_md *md) { mutex_exit(&pmap_lock); } #ifdef DIAGNOSTIC static inline int pmap_page_locked_p(struct vm_page_md *md) { return mutex_owned(&pmap_lock); } #endif /* * Metadata for L1 translation tables. */ #ifndef ARM_MMU_EXTENDED struct l1_ttable { /* Entry on the L1 Table list */ SLIST_ENTRY(l1_ttable) l1_link; /* Entry on the L1 Least Recently Used list */ TAILQ_ENTRY(l1_ttable) l1_lru; /* Track how many domains are allocated from this L1 */ volatile u_int l1_domain_use_count; /* * A free-list of domain numbers for this L1. * We avoid using ffs() and a bitmap to track domains since ffs() * is slow on ARM. */ uint8_t l1_domain_first; uint8_t l1_domain_free[PMAP_DOMAINS]; /* Physical address of this L1 page table */ paddr_t l1_physaddr; /* KVA of this L1 page table */ pd_entry_t *l1_kva; }; /* * L1 Page Tables are tracked using a Least Recently Used list. * - New L1s are allocated from the HEAD. * - Freed L1s are added to the TAIl. * - Recently accessed L1s (where an 'access' is some change to one of * the userland pmaps which owns this L1) are moved to the TAIL. */ static TAILQ_HEAD(, l1_ttable) l1_lru_list; static kmutex_t l1_lru_lock __cacheline_aligned; /* * A list of all L1 tables */ static SLIST_HEAD(, l1_ttable) l1_list; #endif /* ARM_MMU_EXTENDED */ /* * The l2_dtable tracks L2_BUCKET_SIZE worth of L1 slots. * * This is normally 16MB worth L2 page descriptors for any given pmap. * Reference counts are maintained for L2 descriptors so they can be * freed when empty. */ struct l2_dtable { /* The number of L2 page descriptors allocated to this l2_dtable */ u_int l2_occupancy; /* List of L2 page descriptors */ struct l2_bucket { pt_entry_t *l2b_kva; /* KVA of L2 Descriptor Table */ paddr_t l2b_pa; /* Physical address of same */ u_short l2b_l1slot; /* This L2 table's L1 index */ u_short l2b_occupancy; /* How many active descriptors */ } l2_bucket[L2_BUCKET_SIZE]; }; /* * Given an L1 table index, calculate the corresponding l2_dtable index * and bucket index within the l2_dtable. */ #define L2_BUCKET_XSHIFT (L2_BUCKET_XLOG2 - L1_S_SHIFT) #define L2_BUCKET_XFRAME (~(vaddr_t)0 << L2_BUCKET_XLOG2) #define L2_BUCKET_IDX(l1slot) ((l1slot) >> L2_BUCKET_XSHIFT) #define L2_IDX(l1slot) (L2_BUCKET_IDX(l1slot) >> L2_BUCKET_LOG2) #define L2_BUCKET(l1slot) (L2_BUCKET_IDX(l1slot) & (L2_BUCKET_SIZE - 1)) __CTASSERT(0x100000000ULL == ((uint64_t)L2_SIZE * L2_BUCKET_SIZE * L1_S_SIZE)); __CTASSERT(L2_BUCKET_XFRAME == ~(L2_BUCKET_XSIZE-1)); /* * Given a virtual address, this macro returns the * virtual address required to drop into the next L2 bucket. */ #define L2_NEXT_BUCKET_VA(va) (((va) & L2_BUCKET_XFRAME) + L2_BUCKET_XSIZE) /* * L2 allocation. */ #define pmap_alloc_l2_dtable() \ pool_cache_get(&pmap_l2dtable_cache, PR_NOWAIT) #define pmap_free_l2_dtable(l2) \ pool_cache_put(&pmap_l2dtable_cache, (l2)) #define pmap_alloc_l2_ptp(pap) \ ((pt_entry_t *)pool_cache_get_paddr(&pmap_l2ptp_cache,\ PR_NOWAIT, (pap))) /* * We try to map the page tables write-through, if possible. However, not * all CPUs have a write-through cache mode, so on those we have to sync * the cache when we frob page tables. * * We try to evaluate this at compile time, if possible. However, it's * not always possible to do that, hence this run-time var. */ int pmap_needs_pte_sync; /* * Real definition of pv_entry. */ struct pv_entry { SLIST_ENTRY(pv_entry) pv_link; /* next pv_entry */ pmap_t pv_pmap; /* pmap where mapping lies */ vaddr_t pv_va; /* virtual address for mapping */ u_int pv_flags; /* flags */ }; /* * Macro to determine if a mapping might be resident in the * instruction cache and/or TLB */ #if ARM_MMU_V7 > 0 && !defined(ARM_MMU_EXTENDED) /* * Speculative loads by Cortex cores can cause TLB entries to be filled even if * there are no explicit accesses, so there may be always be TLB entries to * flush. If we used ASIDs then this would not be a problem. */ #define PV_BEEN_EXECD(f) (((f) & PVF_EXEC) == PVF_EXEC) #else #define PV_BEEN_EXECD(f) (((f) & (PVF_REF | PVF_EXEC)) == (PVF_REF | PVF_EXEC)) #endif #define PV_IS_EXEC_P(f) (((f) & PVF_EXEC) != 0) #define PV_IS_KENTRY_P(f) (((f) & PVF_KENTRY) != 0) #define PV_IS_WRITE_P(f) (((f) & PVF_WRITE) != 0) /* * Macro to determine if a mapping might be resident in the * data cache and/or TLB */ #if ARM_MMU_V7 > 0 && !defined(ARM_MMU_EXTENDED) /* * Speculative loads by Cortex cores can cause TLB entries to be filled even if * there are no explicit accesses, so there may be always be TLB entries to * flush. If we used ASIDs then this would not be a problem. */ #define PV_BEEN_REFD(f) (1) #else #define PV_BEEN_REFD(f) (((f) & PVF_REF) != 0) #endif /* * Local prototypes */ static bool pmap_set_pt_cache_mode(pd_entry_t *, vaddr_t, size_t); static void pmap_alloc_specials(vaddr_t *, int, vaddr_t *, pt_entry_t **); static bool pmap_is_current(pmap_t); static bool pmap_is_cached(pmap_t); static void pmap_enter_pv(struct vm_page_md *, paddr_t, struct pv_entry *, pmap_t, vaddr_t, u_int); static struct pv_entry *pmap_find_pv(struct vm_page_md *, pmap_t, vaddr_t); static struct pv_entry *pmap_remove_pv(struct vm_page_md *, paddr_t, pmap_t, vaddr_t); static u_int pmap_modify_pv(struct vm_page_md *, paddr_t, pmap_t, vaddr_t, u_int, u_int); static void pmap_pinit(pmap_t); static int pmap_pmap_ctor(void *, void *, int); static void pmap_alloc_l1(pmap_t); static void pmap_free_l1(pmap_t); #ifndef ARM_MMU_EXTENDED static void pmap_use_l1(pmap_t); #endif static struct l2_bucket *pmap_get_l2_bucket(pmap_t, vaddr_t); static struct l2_bucket *pmap_alloc_l2_bucket(pmap_t, vaddr_t); static void pmap_free_l2_bucket(pmap_t, struct l2_bucket *, u_int); static int pmap_l2ptp_ctor(void *, void *, int); static int pmap_l2dtable_ctor(void *, void *, int); static void pmap_vac_me_harder(struct vm_page_md *, paddr_t, pmap_t, vaddr_t); #ifdef PMAP_CACHE_VIVT static void pmap_vac_me_kpmap(struct vm_page_md *, paddr_t, pmap_t, vaddr_t); static void pmap_vac_me_user(struct vm_page_md *, paddr_t, pmap_t, vaddr_t); #endif static void pmap_clearbit(struct vm_page_md *, paddr_t, u_int); #ifdef PMAP_CACHE_VIVT static bool pmap_clean_page(struct vm_page_md *, bool); #endif #ifdef PMAP_CACHE_VIPT static void pmap_syncicache_page(struct vm_page_md *, paddr_t); enum pmap_flush_op { PMAP_FLUSH_PRIMARY, PMAP_FLUSH_SECONDARY, PMAP_CLEAN_PRIMARY }; #ifndef ARM_MMU_EXTENDED static void pmap_flush_page(struct vm_page_md *, paddr_t, enum pmap_flush_op); #endif #endif static void pmap_page_remove(struct vm_page_md *, paddr_t); #ifndef ARM_MMU_EXTENDED static void pmap_init_l1(struct l1_ttable *, pd_entry_t *); #endif static vaddr_t kernel_pt_lookup(paddr_t); /* * Misc variables */ vaddr_t virtual_avail; vaddr_t virtual_end; vaddr_t pmap_curmaxkvaddr; paddr_t avail_start; paddr_t avail_end; pv_addrqh_t pmap_boot_freeq = SLIST_HEAD_INITIALIZER(&pmap_boot_freeq); pv_addr_t kernelpages; pv_addr_t kernel_l1pt; pv_addr_t systempage; /* Function to set the debug level of the pmap code */ #ifdef PMAP_DEBUG void pmap_debug(int level) { pmap_debug_level = level; printf("pmap_debug: level=%d\n", pmap_debug_level); } #endif /* PMAP_DEBUG */ #ifdef PMAP_CACHE_VIPT #define PMAP_VALIDATE_MD_PAGE(md) \ KASSERTMSG(arm_cache_prefer_mask == 0 || (((md)->pvh_attrs & PVF_WRITE) == 0) == ((md)->urw_mappings + (md)->krw_mappings == 0), \ "(md) %p: attrs=%#x urw=%u krw=%u", (md), \ (md)->pvh_attrs, (md)->urw_mappings, (md)->krw_mappings); #endif /* PMAP_CACHE_VIPT */ /* * A bunch of routines to conditionally flush the caches/TLB depending * on whether the specified pmap actually needs to be flushed at any * given time. */ static inline void pmap_tlb_flush_SE(pmap_t pm, vaddr_t va, u_int flags) { #ifdef ARM_MMU_EXTENDED pmap_tlb_invalidate_addr(pm, va); #else if (pm->pm_cstate.cs_tlb_id != 0) { if (PV_BEEN_EXECD(flags)) { cpu_tlb_flushID_SE(va); } else if (PV_BEEN_REFD(flags)) { cpu_tlb_flushD_SE(va); } } #endif /* ARM_MMU_EXTENDED */ } static inline void pmap_tlb_flushID(pmap_t pm) { #ifdef ARM_MMU_EXTENDED pmap_tlb_asid_release_all(pm); #else if (pm->pm_cstate.cs_tlb_id) { cpu_tlb_flushID(); #if ARM_MMU_V7 == 0 /* * Speculative loads by Cortex cores can cause TLB entries to * be filled even if there are no explicit accesses, so there * may be always be TLB entries to flush. If we used ASIDs * then it would not be a problem. * This is not true for other CPUs. */ pm->pm_cstate.cs_tlb = 0; #endif /* ARM_MMU_V7 */ } #endif /* ARM_MMU_EXTENDED */ } static inline void pmap_tlb_flushD(pmap_t pm) { #ifdef ARM_MMU_EXTENDED pmap_tlb_asid_release_all(pm); #else if (pm->pm_cstate.cs_tlb_d) { cpu_tlb_flushD(); #if ARM_MMU_V7 == 0 /* * Speculative loads by Cortex cores can cause TLB entries to * be filled even if there are no explicit accesses, so there * may be always be TLB entries to flush. If we used ASIDs * then it would not be a problem. * This is not true for other CPUs. */ pm->pm_cstate.cs_tlb_d = 0; #endif /* ARM_MMU_V7 */ } #endif /* ARM_MMU_EXTENDED */ } #ifdef PMAP_CACHE_VIVT static inline void pmap_cache_wbinv_page(pmap_t pm, vaddr_t va, bool do_inv, u_int flags) { if (PV_BEEN_EXECD(flags) && pm->pm_cstate.cs_cache_id) { cpu_idcache_wbinv_range(va, PAGE_SIZE); } else if (PV_BEEN_REFD(flags) && pm->pm_cstate.cs_cache_d) { if (do_inv) { if (flags & PVF_WRITE) cpu_dcache_wbinv_range(va, PAGE_SIZE); else cpu_dcache_inv_range(va, PAGE_SIZE); } else if (flags & PVF_WRITE) { cpu_dcache_wb_range(va, PAGE_SIZE); } } } static inline void pmap_cache_wbinv_all(pmap_t pm, u_int flags) { if (PV_BEEN_EXECD(flags)) { if (pm->pm_cstate.cs_cache_id) { cpu_idcache_wbinv_all(); pm->pm_cstate.cs_cache = 0; } } else if (pm->pm_cstate.cs_cache_d) { cpu_dcache_wbinv_all(); pm->pm_cstate.cs_cache_d = 0; } } #endif /* PMAP_CACHE_VIVT */ static inline uint8_t pmap_domain(pmap_t pm) { #ifdef ARM_MMU_EXTENDED return pm == pmap_kernel() ? PMAP_DOMAIN_KERNEL : PMAP_DOMAIN_USER; #else return pm->pm_domain; #endif } static inline pd_entry_t * pmap_l1_kva(pmap_t pm) { #ifdef ARM_MMU_EXTENDED return pm->pm_l1; #else return pm->pm_l1->l1_kva; #endif } static inline bool pmap_is_current(pmap_t pm) { if (pm == pmap_kernel() || curproc->p_vmspace->vm_map.pmap == pm) return true; return false; } static inline bool pmap_is_cached(pmap_t pm) { #ifdef ARM_MMU_EXTENDED struct pmap_tlb_info * const ti = cpu_tlb_info(curcpu()); if (pm == pmap_kernel() || PMAP_PAI_ASIDVALID_P(PMAP_PAI(pm, ti), ti)) return true; #else struct cpu_info * const ci = curcpu(); if (pm == pmap_kernel() || ci->ci_pmap_lastuser == NULL || ci->ci_pmap_lastuser == pm) return true; #endif /* ARM_MMU_EXTENDED */ return false; } /* * PTE_SYNC_CURRENT: * * Make sure the pte is written out to RAM. * We need to do this for one of two cases: * - We're dealing with the kernel pmap * - There is no pmap active in the cache/tlb. * - The specified pmap is 'active' in the cache/tlb. */ #ifdef PMAP_INCLUDE_PTE_SYNC #define PTE_SYNC_CURRENT(pm, ptep) \ do { \ if (PMAP_NEEDS_PTE_SYNC && \ pmap_is_cached(pm)) \ PTE_SYNC(ptep); \ } while (/*CONSTCOND*/0) #else #define PTE_SYNC_CURRENT(pm, ptep) /* nothing */ #endif /* * main pv_entry manipulation functions: * pmap_enter_pv: enter a mapping onto a vm_page list * pmap_remove_pv: remove a mapping from a vm_page list * * NOTE: pmap_enter_pv expects to lock the pvh itself * pmap_remove_pv expects the caller to lock the pvh before calling */ /* * pmap_enter_pv: enter a mapping onto a vm_page lst * * => caller should hold the proper lock on pmap_main_lock * => caller should have pmap locked * => we will gain the lock on the vm_page and allocate the new pv_entry * => caller should adjust ptp's wire_count before calling * => caller should not adjust pmap's wire_count */ static void pmap_enter_pv(struct vm_page_md *md, paddr_t pa, struct pv_entry *pv, pmap_t pm, vaddr_t va, u_int flags) { struct pv_entry **pvp; NPDEBUG(PDB_PVDUMP, printf("pmap_enter_pv: pm %p, md %p, flags 0x%x\n", pm, md, flags)); pv->pv_pmap = pm; pv->pv_va = va; pv->pv_flags = flags; pvp = &SLIST_FIRST(&md->pvh_list); #ifdef PMAP_CACHE_VIPT /* * Insert unmanaged entries, writeable first, at the head of * the pv list. */ if (__predict_true(!PV_IS_KENTRY_P(flags))) { while (*pvp != NULL && PV_IS_KENTRY_P((*pvp)->pv_flags)) pvp = &SLIST_NEXT(*pvp, pv_link); } if (!PV_IS_WRITE_P(flags)) { while (*pvp != NULL && PV_IS_WRITE_P((*pvp)->pv_flags)) pvp = &SLIST_NEXT(*pvp, pv_link); } #endif SLIST_NEXT(pv, pv_link) = *pvp; /* add to ... */ *pvp = pv; /* ... locked list */ md->pvh_attrs |= flags & (PVF_REF | PVF_MOD); #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) if ((pv->pv_flags & PVF_KWRITE) == PVF_KWRITE) md->pvh_attrs |= PVF_KMOD; if ((md->pvh_attrs & (PVF_DMOD|PVF_NC)) != PVF_NC) md->pvh_attrs |= PVF_DIRTY; KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); #endif if (pm == pmap_kernel()) { PMAPCOUNT(kernel_mappings); if (flags & PVF_WRITE) md->krw_mappings++; else md->kro_mappings++; } else { if (flags & PVF_WRITE) md->urw_mappings++; else md->uro_mappings++; } #ifdef PMAP_CACHE_VIPT #ifndef ARM_MMU_EXTENDED /* * Even though pmap_vac_me_harder will set PVF_WRITE for us, * do it here as well to keep the mappings & KVF_WRITE consistent. */ if (arm_cache_prefer_mask != 0 && (flags & PVF_WRITE) != 0) { md->pvh_attrs |= PVF_WRITE; } #endif /* * If this is an exec mapping and its the first exec mapping * for this page, make sure to sync the I-cache. */ if (PV_IS_EXEC_P(flags)) { #ifndef ARM_MMU_EXTENDED if (!PV_IS_EXEC_P(md->pvh_attrs)) { pmap_syncicache_page(md, pa); PMAPCOUNT(exec_synced_map); } #endif PMAPCOUNT(exec_mappings); } #endif PMAPCOUNT(mappings); if (pv->pv_flags & PVF_WIRED) ++pm->pm_stats.wired_count; } /* * * pmap_find_pv: Find a pv entry * * => caller should hold lock on vm_page */ static inline struct pv_entry * pmap_find_pv(struct vm_page_md *md, pmap_t pm, vaddr_t va) { struct pv_entry *pv; SLIST_FOREACH(pv, &md->pvh_list, pv_link) { if (pm == pv->pv_pmap && va == pv->pv_va) break; } return (pv); } /* * pmap_remove_pv: try to remove a mapping from a pv_list * * => caller should hold proper lock on pmap_main_lock * => pmap should be locked * => caller should hold lock on vm_page [so that attrs can be adjusted] * => caller should adjust ptp's wire_count and free PTP if needed * => caller should NOT adjust pmap's wire_count * => we return the removed pv */ static struct pv_entry * pmap_remove_pv(struct vm_page_md *md, paddr_t pa, pmap_t pm, vaddr_t va) { struct pv_entry *pv, **prevptr; NPDEBUG(PDB_PVDUMP, printf("pmap_remove_pv: pm %p, md %p, va 0x%08lx\n", pm, md, va)); prevptr = &SLIST_FIRST(&md->pvh_list); /* prev pv_entry ptr */ pv = *prevptr; while (pv) { if (pv->pv_pmap == pm && pv->pv_va == va) { /* match? */ NPDEBUG(PDB_PVDUMP, printf("pmap_remove_pv: pm %p, md " "%p, flags 0x%x\n", pm, md, pv->pv_flags)); if (pv->pv_flags & PVF_WIRED) { --pm->pm_stats.wired_count; } *prevptr = SLIST_NEXT(pv, pv_link); /* remove it! */ if (pm == pmap_kernel()) { PMAPCOUNT(kernel_unmappings); if (pv->pv_flags & PVF_WRITE) md->krw_mappings--; else md->kro_mappings--; } else { if (pv->pv_flags & PVF_WRITE) md->urw_mappings--; else md->uro_mappings--; } PMAPCOUNT(unmappings); #ifdef PMAP_CACHE_VIPT if (!(pv->pv_flags & PVF_WRITE)) break; /* * If this page has had an exec mapping, then if * this was the last mapping, discard the contents, * otherwise sync the i-cache for this page. */ if (PV_IS_EXEC_P(md->pvh_attrs)) { #ifdef ARM_MMU_EXTENDED md->pvh_attrs &= ~PVF_EXEC; PMAPCOUNT(exec_discarded_unmap); #else if (SLIST_EMPTY(&md->pvh_list)) { md->pvh_attrs &= ~PVF_EXEC; PMAPCOUNT(exec_discarded_unmap); } else { pmap_syncicache_page(md, pa); PMAPCOUNT(exec_synced_unmap); } #endif /* ARM_MMU_EXTENDED */ } #endif /* PMAP_CACHE_VIPT */ break; } prevptr = &SLIST_NEXT(pv, pv_link); /* previous pointer */ pv = *prevptr; /* advance */ } #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) /* * If we no longer have a WRITEABLE KENTRY at the head of list, * clear the KMOD attribute from the page. */ if (SLIST_FIRST(&md->pvh_list) == NULL || (SLIST_FIRST(&md->pvh_list)->pv_flags & PVF_KWRITE) != PVF_KWRITE) md->pvh_attrs &= ~PVF_KMOD; /* * If this was a writeable page and there are no more writeable * mappings (ignoring KMPAGE), clear the WRITE flag and writeback * the contents to memory. */ if (arm_cache_prefer_mask != 0) { if (md->krw_mappings + md->urw_mappings == 0) md->pvh_attrs &= ~PVF_WRITE; PMAP_VALIDATE_MD_PAGE(md); } KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); #endif /* PMAP_CACHE_VIPT && !ARM_MMU_EXTENDED */ return(pv); /* return removed pv */ } /* * * pmap_modify_pv: Update pv flags * * => caller should hold lock on vm_page [so that attrs can be adjusted] * => caller should NOT adjust pmap's wire_count * => caller must call pmap_vac_me_harder() if writable status of a page * may have changed. * => we return the old flags * * Modify a physical-virtual mapping in the pv table */ static u_int pmap_modify_pv(struct vm_page_md *md, paddr_t pa, pmap_t pm, vaddr_t va, u_int clr_mask, u_int set_mask) { struct pv_entry *npv; u_int flags, oflags; KASSERT(!PV_IS_KENTRY_P(clr_mask)); KASSERT(!PV_IS_KENTRY_P(set_mask)); if ((npv = pmap_find_pv(md, pm, va)) == NULL) return (0); NPDEBUG(PDB_PVDUMP, printf("pmap_modify_pv: pm %p, md %p, clr 0x%x, set 0x%x, flags 0x%x\n", pm, md, clr_mask, set_mask, npv->pv_flags)); /* * There is at least one VA mapping this page. */ if (clr_mask & (PVF_REF | PVF_MOD)) { md->pvh_attrs |= set_mask & (PVF_REF | PVF_MOD); #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) if ((md->pvh_attrs & (PVF_DMOD|PVF_NC)) != PVF_NC) md->pvh_attrs |= PVF_DIRTY; KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); #endif /* PMAP_CACHE_VIPT && !ARM_MMU_EXTENDED */ } oflags = npv->pv_flags; npv->pv_flags = flags = (oflags & ~clr_mask) | set_mask; if ((flags ^ oflags) & PVF_WIRED) { if (flags & PVF_WIRED) ++pm->pm_stats.wired_count; else --pm->pm_stats.wired_count; } if ((flags ^ oflags) & PVF_WRITE) { if (pm == pmap_kernel()) { if (flags & PVF_WRITE) { md->krw_mappings++; md->kro_mappings--; } else { md->kro_mappings++; md->krw_mappings--; } } else { if (flags & PVF_WRITE) { md->urw_mappings++; md->uro_mappings--; } else { md->uro_mappings++; md->urw_mappings--; } } } #ifdef PMAP_CACHE_VIPT if (arm_cache_prefer_mask != 0) { if (md->urw_mappings + md->krw_mappings == 0) { md->pvh_attrs &= ~PVF_WRITE; } else { md->pvh_attrs |= PVF_WRITE; } } #ifndef ARM_MMU_EXTENDED /* * We have two cases here: the first is from enter_pv (new exec * page), the second is a combined pmap_remove_pv/pmap_enter_pv. * Since in latter, pmap_enter_pv won't do anything, we just have * to do what pmap_remove_pv would do. */ if ((PV_IS_EXEC_P(flags) && !PV_IS_EXEC_P(md->pvh_attrs)) || (PV_IS_EXEC_P(md->pvh_attrs) || (!(flags & PVF_WRITE) && (oflags & PVF_WRITE)))) { pmap_syncicache_page(md, pa); PMAPCOUNT(exec_synced_remap); } KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); #endif /* !ARM_MMU_EXTENDED */ #endif /* PMAP_CACHE_VIPT */ PMAPCOUNT(remappings); return (oflags); } /* * Allocate an L1 translation table for the specified pmap. * This is called at pmap creation time. */ static void pmap_alloc_l1(pmap_t pm) { #ifdef ARM_MMU_EXTENDED #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS #ifdef PMAP_NEED_ALLOC_POOLPAGE struct vm_page *pg = arm_pmap_alloc_poolpage(UVM_PGA_ZERO); #else struct vm_page *pg = uvm_pagealloc(NULL, 0, NULL, UVM_PGA_ZERO); #endif KASSERT(pg != NULL); pm->pm_l1_pa = VM_PAGE_TO_PHYS(pg); vaddr_t va = KERNEL_BASE + (pm->pm_l1_pa - physical_start); #else KASSERTMSG(kernel_map != NULL, "pm %p", pm); vaddr_t va = uvm_km_alloc(kernel_map, PAGE_SIZE, 0, UVM_KMF_WIRED|UVM_KMF_ZERO); KASSERT(!va); pmap_extract(pmap_kernel(), va, &pm->pm_l1_pa); #endif pm->pm_l1 = (pd_entry_t *)va; #else struct l1_ttable *l1; uint8_t domain; /* * Remove the L1 at the head of the LRU list */ mutex_spin_enter(&l1_lru_lock); l1 = TAILQ_FIRST(&l1_lru_list); KDASSERT(l1 != NULL); TAILQ_REMOVE(&l1_lru_list, l1, l1_lru); /* * Pick the first available domain number, and update * the link to the next number. */ domain = l1->l1_domain_first; l1->l1_domain_first = l1->l1_domain_free[domain]; /* * If there are still free domain numbers in this L1, * put it back on the TAIL of the LRU list. */ if (++l1->l1_domain_use_count < PMAP_DOMAINS) TAILQ_INSERT_TAIL(&l1_lru_list, l1, l1_lru); mutex_spin_exit(&l1_lru_lock); /* * Fix up the relevant bits in the pmap structure */ pm->pm_l1 = l1; pm->pm_domain = domain + 1; #endif } /* * Free an L1 translation table. * This is called at pmap destruction time. */ static void pmap_free_l1(pmap_t pm) { #ifdef ARM_MMU_EXTENDED #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS struct vm_page *pg = PHYS_TO_VM_PAGE(pm->pm_l1_pa); uvm_pagefree(pg); #else uvm_km_free(kernel_map, (vaddr_t)pm->pm_l1, PAGE_SIZE, UVM_KMF_WIRED); #endif pm->pm_l1 = NULL; pm->pm_l1_pa = 0; #else struct l1_ttable *l1 = pm->pm_l1; mutex_spin_enter(&l1_lru_lock); /* * If this L1 is currently on the LRU list, remove it. */ if (l1->l1_domain_use_count < PMAP_DOMAINS) TAILQ_REMOVE(&l1_lru_list, l1, l1_lru); /* * Free up the domain number which was allocated to the pmap */ l1->l1_domain_free[pmap_domain(pm) - 1] = l1->l1_domain_first; l1->l1_domain_first = pmap_domain(pm) - 1; l1->l1_domain_use_count--; /* * The L1 now must have at least 1 free domain, so add * it back to the LRU list. If the use count is zero, * put it at the head of the list, otherwise it goes * to the tail. */ if (l1->l1_domain_use_count == 0) TAILQ_INSERT_HEAD(&l1_lru_list, l1, l1_lru); else TAILQ_INSERT_TAIL(&l1_lru_list, l1, l1_lru); mutex_spin_exit(&l1_lru_lock); #endif /* ARM_MMU_EXTENDED */ } #ifndef ARM_MMU_EXTENDED static inline void pmap_use_l1(pmap_t pm) { struct l1_ttable *l1; /* * Do nothing if we're in interrupt context. * Access to an L1 by the kernel pmap must not affect * the LRU list. */ if (cpu_intr_p() || pm == pmap_kernel()) return; l1 = pm->pm_l1; /* * If the L1 is not currently on the LRU list, just return */ if (l1->l1_domain_use_count == PMAP_DOMAINS) return; mutex_spin_enter(&l1_lru_lock); /* * Check the use count again, now that we've acquired the lock */ if (l1->l1_domain_use_count == PMAP_DOMAINS) { mutex_spin_exit(&l1_lru_lock); return; } /* * Move the L1 to the back of the LRU list */ TAILQ_REMOVE(&l1_lru_list, l1, l1_lru); TAILQ_INSERT_TAIL(&l1_lru_list, l1, l1_lru); mutex_spin_exit(&l1_lru_lock); } #endif /* !ARM_MMU_EXTENDED */ /* * void pmap_free_l2_ptp(pt_entry_t *, paddr_t *) * * Free an L2 descriptor table. */ static inline void #if defined(PMAP_INCLUDE_PTE_SYNC) && defined(PMAP_CACHE_VIVT) pmap_free_l2_ptp(bool need_sync, pt_entry_t *l2, paddr_t pa) #else pmap_free_l2_ptp(pt_entry_t *l2, paddr_t pa) #endif { #if defined(PMAP_INCLUDE_PTE_SYNC) && defined(PMAP_CACHE_VIVT) /* * Note: With a write-back cache, we may need to sync this * L2 table before re-using it. * This is because it may have belonged to a non-current * pmap, in which case the cache syncs would have been * skipped for the pages that were being unmapped. If the * L2 table were then to be immediately re-allocated to * the *current* pmap, it may well contain stale mappings * which have not yet been cleared by a cache write-back * and so would still be visible to the mmu. */ if (need_sync) PTE_SYNC_RANGE(l2, L2_TABLE_SIZE_REAL / sizeof(pt_entry_t)); #endif /* PMAP_INCLUDE_PTE_SYNC && PMAP_CACHE_VIVT */ pool_cache_put_paddr(&pmap_l2ptp_cache, (void *)l2, pa); } /* * Returns a pointer to the L2 bucket associated with the specified pmap * and VA, or NULL if no L2 bucket exists for the address. */ static inline struct l2_bucket * pmap_get_l2_bucket(pmap_t pm, vaddr_t va) { const size_t l1slot = l1pte_index(va); struct l2_dtable *l2; struct l2_bucket *l2b; if ((l2 = pm->pm_l2[L2_IDX(l1slot)]) == NULL || (l2b = &l2->l2_bucket[L2_BUCKET(l1slot)])->l2b_kva == NULL) return (NULL); return (l2b); } /* * Returns a pointer to the L2 bucket associated with the specified pmap * and VA. * * If no L2 bucket exists, perform the necessary allocations to put an L2 * bucket/page table in place. * * Note that if a new L2 bucket/page was allocated, the caller *must* * increment the bucket occupancy counter appropriately *before* * releasing the pmap's lock to ensure no other thread or cpu deallocates * the bucket/page in the meantime. */ static struct l2_bucket * pmap_alloc_l2_bucket(pmap_t pm, vaddr_t va) { const size_t l1slot = l1pte_index(va); struct l2_dtable *l2; if ((l2 = pm->pm_l2[L2_IDX(l1slot)]) == NULL) { /* * No mapping at this address, as there is * no entry in the L1 table. * Need to allocate a new l2_dtable. */ if ((l2 = pmap_alloc_l2_dtable()) == NULL) return (NULL); /* * Link it into the parent pmap */ pm->pm_l2[L2_IDX(l1slot)] = l2; } struct l2_bucket * const l2b = &l2->l2_bucket[L2_BUCKET(l1slot)]; /* * Fetch pointer to the L2 page table associated with the address. */ if (l2b->l2b_kva == NULL) { pt_entry_t *ptep; /* * No L2 page table has been allocated. Chances are, this * is because we just allocated the l2_dtable, above. */ if ((ptep = pmap_alloc_l2_ptp(&l2b->l2b_pa)) == NULL) { /* * Oops, no more L2 page tables available at this * time. We may need to deallocate the l2_dtable * if we allocated a new one above. */ if (l2->l2_occupancy == 0) { pm->pm_l2[L2_IDX(l1slot)] = NULL; pmap_free_l2_dtable(l2); } return (NULL); } l2->l2_occupancy++; l2b->l2b_kva = ptep; l2b->l2b_l1slot = l1slot; #ifdef ARM_MMU_EXTENDED /* * We know there will be a mapping here, so simply * enter this PTP into the L1 now. */ pd_entry_t * const pdep = pmap_l1_kva(pm) + l1slot; pd_entry_t npde = L1_C_PROTO | l2b->l2b_pa | L1_C_DOM(pmap_domain(pm)); KASSERT(*pdep == 0); l1pte_setone(pdep, npde); PTE_SYNC(pdep); #endif } return (l2b); } /* * One or more mappings in the specified L2 descriptor table have just been * invalidated. * * Garbage collect the metadata and descriptor table itself if necessary. * * The pmap lock must be acquired when this is called (not necessary * for the kernel pmap). */ static void pmap_free_l2_bucket(pmap_t pm, struct l2_bucket *l2b, u_int count) { KDASSERT(count <= l2b->l2b_occupancy); /* * Update the bucket's reference count according to how many * PTEs the caller has just invalidated. */ l2b->l2b_occupancy -= count; /* * Note: * * Level 2 page tables allocated to the kernel pmap are never freed * as that would require checking all Level 1 page tables and * removing any references to the Level 2 page table. See also the * comment elsewhere about never freeing bootstrap L2 descriptors. * * We make do with just invalidating the mapping in the L2 table. * * This isn't really a big deal in practice and, in fact, leads * to a performance win over time as we don't need to continually * alloc/free. */ if (l2b->l2b_occupancy > 0 || pm == pmap_kernel()) return; /* * There are no more valid mappings in this level 2 page table. * Go ahead and NULL-out the pointer in the bucket, then * free the page table. */ const size_t l1slot = l2b->l2b_l1slot; pt_entry_t * const ptep = l2b->l2b_kva; l2b->l2b_kva = NULL; pd_entry_t * const pdep = pmap_l1_kva(pm) + l1slot; pd_entry_t pde = *pdep; #ifdef ARM_MMU_EXTENDED /* * Invalidate the L1 slot. */ KASSERT((pde & L1_TYPE_MASK) == L1_TYPE_C); #else /* * If the L1 slot matches the pmap's domain number, then invalidate it. */ if ((pde & (L1_C_DOM_MASK|L1_TYPE_MASK)) == (L1_C_DOM(pmap_domain(pm))|L1_TYPE_C)) { #endif l1pte_setone(pdep, 0); PDE_SYNC(pdep); #ifndef ARM_MMU_EXTENDED } #endif /* * Release the L2 descriptor table back to the pool cache. */ #if defined(PMAP_INCLUDE_PTE_SYNC) && defined(PMAP_CACHE_VIVT) pmap_free_l2_ptp(!pmap_is_cached(pm), ptep, l2b->l2b_pa); #else pmap_free_l2_ptp(ptep, l2b->l2b_pa); #endif /* * Update the reference count in the associated l2_dtable */ struct l2_dtable * const l2 = pm->pm_l2[L2_IDX(l1slot)]; if (--l2->l2_occupancy > 0) return; /* * There are no more valid mappings in any of the Level 1 * slots managed by this l2_dtable. Go ahead and NULL-out * the pointer in the parent pmap and free the l2_dtable. */ pm->pm_l2[L2_IDX(l1slot)] = NULL; pmap_free_l2_dtable(l2); } /* * Pool cache constructors for L2 descriptor tables, metadata and pmap * structures. */ static int pmap_l2ptp_ctor(void *arg, void *v, int flags) { #ifndef PMAP_INCLUDE_PTE_SYNC vaddr_t va = (vaddr_t)v & ~PGOFSET; /* * The mappings for these page tables were initially made using * pmap_kenter_pa() by the pool subsystem. Therefore, the cache- * mode will not be right for page table mappings. To avoid * polluting the pmap_kenter_pa() code with a special case for * page tables, we simply fix up the cache-mode here if it's not * correct. */ if (pte_l2_s_cache_mode != pte_l2_s_cache_mode_pt) { const struct l2_bucket * const l2b = pmap_get_l2_bucket(pmap_kernel(), va); KASSERTMSG(l2b != NULL, "%#lx", va); pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(va)]; const pt_entry_t opte = *ptep; if ((opte & L2_S_CACHE_MASK) != pte_l2_s_cache_mode_pt) { /* * Page tables must have the cache-mode set correctly. */ const pt_entry_t npte = (pte & ~L2_S_CACHE_MASK) | pte_l2_s_cache_mode_pt; l2pte_set(ptep, npte, opte); PTE_SYNC(ptep); cpu_tlb_flushD_SE(va); cpu_cpwait(); } } #endif memset(v, 0, L2_TABLE_SIZE_REAL); PTE_SYNC_RANGE(v, L2_TABLE_SIZE_REAL / sizeof(pt_entry_t)); return (0); } static int pmap_l2dtable_ctor(void *arg, void *v, int flags) { memset(v, 0, sizeof(struct l2_dtable)); return (0); } static int pmap_pmap_ctor(void *arg, void *v, int flags) { memset(v, 0, sizeof(struct pmap)); return (0); } static void pmap_pinit(pmap_t pm) { #ifndef ARM_HAS_VBAR struct l2_bucket *l2b; if (vector_page < KERNEL_BASE) { /* * Map the vector page. */ pmap_enter(pm, vector_page, systempage.pv_pa, VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_READ | VM_PROT_EXECUTE | PMAP_WIRED); pmap_update(pm); pm->pm_pl1vec = pmap_l1_kva(pm) + l1pte_index(vector_page); l2b = pmap_get_l2_bucket(pm, vector_page); KASSERTMSG(l2b != NULL, "%#lx", vector_page); pm->pm_l1vec = l2b->l2b_pa | L1_C_PROTO | L1_C_DOM(pmap_domain(pm)); } else pm->pm_pl1vec = NULL; #endif } #ifdef PMAP_CACHE_VIVT /* * Since we have a virtually indexed cache, we may need to inhibit caching if * there is more than one mapping and at least one of them is writable. * Since we purge the cache on every context switch, we only need to check for * other mappings within the same pmap, or kernel_pmap. * This function is also called when a page is unmapped, to possibly reenable * caching on any remaining mappings. * * The code implements the following logic, where: * * KW = # of kernel read/write pages * KR = # of kernel read only pages * UW = # of user read/write pages * UR = # of user read only pages * * KC = kernel mapping is cacheable * UC = user mapping is cacheable * * KW=0,KR=0 KW=0,KR>0 KW=1,KR=0 KW>1,KR>=0 * +--------------------------------------------- * UW=0,UR=0 | --- KC=1 KC=1 KC=0 * UW=0,UR>0 | UC=1 KC=1,UC=1 KC=0,UC=0 KC=0,UC=0 * UW=1,UR=0 | UC=1 KC=0,UC=0 KC=0,UC=0 KC=0,UC=0 * UW>1,UR>=0 | UC=0 KC=0,UC=0 KC=0,UC=0 KC=0,UC=0 */ static const int pmap_vac_flags[4][4] = { {-1, 0, 0, PVF_KNC}, {0, 0, PVF_NC, PVF_NC}, {0, PVF_NC, PVF_NC, PVF_NC}, {PVF_UNC, PVF_NC, PVF_NC, PVF_NC} }; static inline int pmap_get_vac_flags(const struct vm_page_md *md) { int kidx, uidx; kidx = 0; if (md->kro_mappings || md->krw_mappings > 1) kidx |= 1; if (md->krw_mappings) kidx |= 2; uidx = 0; if (md->uro_mappings || md->urw_mappings > 1) uidx |= 1; if (md->urw_mappings) uidx |= 2; return (pmap_vac_flags[uidx][kidx]); } static inline void pmap_vac_me_harder(struct vm_page_md *md, paddr_t pa, pmap_t pm, vaddr_t va) { int nattr; nattr = pmap_get_vac_flags(md); if (nattr < 0) { md->pvh_attrs &= ~PVF_NC; return; } if (nattr == 0 && (md->pvh_attrs & PVF_NC) == 0) return; if (pm == pmap_kernel()) pmap_vac_me_kpmap(md, pa, pm, va); else pmap_vac_me_user(md, pa, pm, va); md->pvh_attrs = (md->pvh_attrs & ~PVF_NC) | nattr; } static void pmap_vac_me_kpmap(struct vm_page_md *md, paddr_t pa, pmap_t pm, vaddr_t va) { u_int u_cacheable, u_entries; struct pv_entry *pv; pmap_t last_pmap = pm; /* * Pass one, see if there are both kernel and user pmaps for * this page. Calculate whether there are user-writable or * kernel-writable pages. */ u_cacheable = 0; SLIST_FOREACH(pv, &md->pvh_list, pv_link) { if (pv->pv_pmap != pm && (pv->pv_flags & PVF_NC) == 0) u_cacheable++; } u_entries = md->urw_mappings + md->uro_mappings; /* * We know we have just been updating a kernel entry, so if * all user pages are already cacheable, then there is nothing * further to do. */ if (md->k_mappings == 0 && u_cacheable == u_entries) return; if (u_entries) { /* * Scan over the list again, for each entry, if it * might not be set correctly, call pmap_vac_me_user * to recalculate the settings. */ SLIST_FOREACH(pv, &md->pvh_list, pv_link) { /* * We know kernel mappings will get set * correctly in other calls. We also know * that if the pmap is the same as last_pmap * then we've just handled this entry. */ if (pv->pv_pmap == pm || pv->pv_pmap == last_pmap) continue; /* * If there are kernel entries and this page * is writable but non-cacheable, then we can * skip this entry also. */ if (md->k_mappings && (pv->pv_flags & (PVF_NC | PVF_WRITE)) == (PVF_NC | PVF_WRITE)) continue; /* * Similarly if there are no kernel-writable * entries and the page is already * read-only/cacheable. */ if (md->krw_mappings == 0 && (pv->pv_flags & (PVF_NC | PVF_WRITE)) == 0) continue; /* * For some of the remaining cases, we know * that we must recalculate, but for others we * can't tell if they are correct or not, so * we recalculate anyway. */ pmap_vac_me_user(md, pa, (last_pmap = pv->pv_pmap), 0); } if (md->k_mappings == 0) return; } pmap_vac_me_user(md, pa, pm, va); } static void pmap_vac_me_user(struct vm_page_md *md, paddr_t pa, pmap_t pm, vaddr_t va) { pmap_t kpmap = pmap_kernel(); struct pv_entry *pv, *npv = NULL; u_int entries = 0; u_int writable = 0; u_int cacheable_entries = 0; u_int kern_cacheable = 0; u_int other_writable = 0; /* * Count mappings and writable mappings in this pmap. * Include kernel mappings as part of our own. * Keep a pointer to the first one. */ npv = NULL; KASSERT(pmap_page_locked_p(md)); SLIST_FOREACH(pv, &md->pvh_list, pv_link) { /* Count mappings in the same pmap */ if (pm == pv->pv_pmap || kpmap == pv->pv_pmap) { if (entries++ == 0) npv = pv; /* Cacheable mappings */ if ((pv->pv_flags & PVF_NC) == 0) { cacheable_entries++; if (kpmap == pv->pv_pmap) kern_cacheable++; } /* Writable mappings */ if (pv->pv_flags & PVF_WRITE) ++writable; } else if (pv->pv_flags & PVF_WRITE) other_writable = 1; } /* * Enable or disable caching as necessary. * Note: the first entry might be part of the kernel pmap, * so we can't assume this is indicative of the state of the * other (maybe non-kpmap) entries. */ if ((entries > 1 && writable) || (entries > 0 && pm == kpmap && other_writable)) { if (cacheable_entries == 0) { return; } for (pv = npv; pv; pv = SLIST_NEXT(pv, pv_link)) { if ((pm != pv->pv_pmap && kpmap != pv->pv_pmap) || (pv->pv_flags & PVF_NC)) continue; pv->pv_flags |= PVF_NC; struct l2_bucket * const l2b = pmap_get_l2_bucket(pv->pv_pmap, pv->pv_va); KASSERTMSG(l2b != NULL, "%#lx", va); pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(pv->pv_va)]; const pt_entry_t opte = *ptep; pt_entry_t npte = opte & ~L2_S_CACHE_MASK; if ((va != pv->pv_va || pm != pv->pv_pmap) && l2pte_valid_p(npte)) { #ifdef PMAP_CACHE_VIVT pmap_cache_wbinv_page(pv->pv_pmap, pv->pv_va, true, pv->pv_flags); #endif pmap_tlb_flush_SE(pv->pv_pmap, pv->pv_va, pv->pv_flags); } l2pte_set(ptep, npte, opte); PTE_SYNC_CURRENT(pv->pv_pmap, ptep); } cpu_cpwait(); } else if (entries > cacheable_entries) { /* * Turn cacheing back on for some pages. If it is a kernel * page, only do so if there are no other writable pages. */ for (pv = npv; pv; pv = SLIST_NEXT(pv, pv_link)) { if (!(pv->pv_flags & PVF_NC) || (pm != pv->pv_pmap && (kpmap != pv->pv_pmap || other_writable))) continue; pv->pv_flags &= ~PVF_NC; struct l2_bucket * const l2b = pmap_get_l2_bucket(pv->pv_pmap, pv->pv_va); KASSERTMSG(l2b != NULL, "%#lx", va); pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(pv->pv_va)]; const pt_entry_t opte = *ptep; pt_entry_t npte = (opte & ~L2_S_CACHE_MASK) | pte_l2_s_cache_mode; if (l2pte_valid_p(opte)) { pmap_tlb_flush_SE(pv->pv_pmap, pv->pv_va, pv->pv_flags); } l2pte_set(ptep, npte, opte); PTE_SYNC_CURRENT(pv->pv_pmap, ptep); } } } #endif #ifdef PMAP_CACHE_VIPT static void pmap_vac_me_harder(struct vm_page_md *md, paddr_t pa, pmap_t pm, vaddr_t va) { #ifndef ARM_MMU_EXTENDED struct pv_entry *pv; vaddr_t tst_mask; bool bad_alias; const u_int rw_mappings = md->urw_mappings + md->krw_mappings, ro_mappings = md->uro_mappings + md->kro_mappings; /* do we need to do anything? */ if (arm_cache_prefer_mask == 0) return; NPDEBUG(PDB_VAC, printf("pmap_vac_me_harder: md=%p, pmap=%p va=%08lx\n", md, pm, va)); KASSERT(!va || pm); KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); /* Already a conflict? */ if (__predict_false(md->pvh_attrs & PVF_NC)) { /* just an add, things are already non-cached */ KASSERT(!(md->pvh_attrs & PVF_DIRTY)); KASSERT(!(md->pvh_attrs & PVF_MULTCLR)); bad_alias = false; if (va) { PMAPCOUNT(vac_color_none); bad_alias = true; KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); goto fixup; } pv = SLIST_FIRST(&md->pvh_list); /* the list can't be empty because it would be cachable */ if (md->pvh_attrs & PVF_KMPAGE) { tst_mask = md->pvh_attrs; } else { KASSERT(pv); tst_mask = pv->pv_va; pv = SLIST_NEXT(pv, pv_link); } /* * Only check for a bad alias if we have writable mappings. */ tst_mask &= arm_cache_prefer_mask; if (rw_mappings > 0) { for (; pv && !bad_alias; pv = SLIST_NEXT(pv, pv_link)) { /* if there's a bad alias, stop checking. */ if (tst_mask != (pv->pv_va & arm_cache_prefer_mask)) bad_alias = true; } md->pvh_attrs |= PVF_WRITE; if (!bad_alias) md->pvh_attrs |= PVF_DIRTY; } else { /* * We have only read-only mappings. Let's see if there * are multiple colors in use or if we mapped a KMPAGE. * If the latter, we have a bad alias. If the former, * we need to remember that. */ for (; pv; pv = SLIST_NEXT(pv, pv_link)) { if (tst_mask != (pv->pv_va & arm_cache_prefer_mask)) { if (md->pvh_attrs & PVF_KMPAGE) bad_alias = true; break; } } md->pvh_attrs &= ~PVF_WRITE; /* * No KMPAGE and we exited early, so we must have * multiple color mappings. */ if (!bad_alias && pv != NULL) md->pvh_attrs |= PVF_MULTCLR; } /* If no conflicting colors, set everything back to cached */ if (!bad_alias) { #ifdef DEBUG if ((md->pvh_attrs & PVF_WRITE) || ro_mappings < 2) { SLIST_FOREACH(pv, &md->pvh_list, pv_link) KDASSERT(((tst_mask ^ pv->pv_va) & arm_cache_prefer_mask) == 0); } #endif md->pvh_attrs &= (PAGE_SIZE - 1) & ~PVF_NC; md->pvh_attrs |= tst_mask | PVF_COLORED; /* * Restore DIRTY bit if page is modified */ if (md->pvh_attrs & PVF_DMOD) md->pvh_attrs |= PVF_DIRTY; PMAPCOUNT(vac_color_restore); } else { KASSERT(SLIST_FIRST(&md->pvh_list) != NULL); KASSERT(SLIST_NEXT(SLIST_FIRST(&md->pvh_list), pv_link) != NULL); } KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); } else if (!va) { KASSERT(pmap_is_page_colored_p(md)); KASSERT(!(md->pvh_attrs & PVF_WRITE) || (md->pvh_attrs & PVF_DIRTY)); if (rw_mappings == 0) { md->pvh_attrs &= ~PVF_WRITE; if (ro_mappings == 1 && (md->pvh_attrs & PVF_MULTCLR)) { /* * If this is the last readonly mapping * but it doesn't match the current color * for the page, change the current color * to match this last readonly mapping. */ pv = SLIST_FIRST(&md->pvh_list); tst_mask = (md->pvh_attrs ^ pv->pv_va) & arm_cache_prefer_mask; if (tst_mask) { md->pvh_attrs ^= tst_mask; PMAPCOUNT(vac_color_change); } } } KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); return; } else if (!pmap_is_page_colored_p(md)) { /* not colored so we just use its color */ KASSERT(md->pvh_attrs & (PVF_WRITE|PVF_DIRTY)); KASSERT(!(md->pvh_attrs & PVF_MULTCLR)); PMAPCOUNT(vac_color_new); md->pvh_attrs &= PAGE_SIZE - 1; md->pvh_attrs |= PVF_COLORED | (va & arm_cache_prefer_mask) | (rw_mappings > 0 ? PVF_WRITE : 0); KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); return; } else if (((md->pvh_attrs ^ va) & arm_cache_prefer_mask) == 0) { bad_alias = false; if (rw_mappings > 0) { /* * We now have writeable mappings and if we have * readonly mappings in more than once color, we have * an aliasing problem. Regardless mark the page as * writeable. */ if (md->pvh_attrs & PVF_MULTCLR) { if (ro_mappings < 2) { /* * If we only have less than two * read-only mappings, just flush the * non-primary colors from the cache. */ pmap_flush_page(md, pa, PMAP_FLUSH_SECONDARY); } else { bad_alias = true; } } md->pvh_attrs |= PVF_WRITE; } /* If no conflicting colors, set everything back to cached */ if (!bad_alias) { #ifdef DEBUG if (rw_mappings > 0 || (md->pvh_attrs & PMAP_KMPAGE)) { tst_mask = md->pvh_attrs & arm_cache_prefer_mask; SLIST_FOREACH(pv, &md->pvh_list, pv_link) KDASSERT(((tst_mask ^ pv->pv_va) & arm_cache_prefer_mask) == 0); } #endif if (SLIST_EMPTY(&md->pvh_list)) PMAPCOUNT(vac_color_reuse); else PMAPCOUNT(vac_color_ok); /* matching color, just return */ KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); return; } KASSERT(SLIST_FIRST(&md->pvh_list) != NULL); KASSERT(SLIST_NEXT(SLIST_FIRST(&md->pvh_list), pv_link) != NULL); /* color conflict. evict from cache. */ pmap_flush_page(md, pa, PMAP_FLUSH_PRIMARY); md->pvh_attrs &= ~PVF_COLORED; md->pvh_attrs |= PVF_NC; KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); KASSERT(!(md->pvh_attrs & PVF_MULTCLR)); PMAPCOUNT(vac_color_erase); } else if (rw_mappings == 0 && (md->pvh_attrs & PVF_KMPAGE) == 0) { KASSERT((md->pvh_attrs & PVF_WRITE) == 0); /* * If the page has dirty cache lines, clean it. */ if (md->pvh_attrs & PVF_DIRTY) pmap_flush_page(md, pa, PMAP_CLEAN_PRIMARY); /* * If this is the first remapping (we know that there are no * writeable mappings), then this is a simple color change. * Otherwise this is a seconary r/o mapping, which means * we don't have to do anything. */ if (ro_mappings == 1) { KASSERT(((md->pvh_attrs ^ va) & arm_cache_prefer_mask) != 0); md->pvh_attrs &= PAGE_SIZE - 1; md->pvh_attrs |= (va & arm_cache_prefer_mask); PMAPCOUNT(vac_color_change); } else { PMAPCOUNT(vac_color_blind); } md->pvh_attrs |= PVF_MULTCLR; KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); return; } else { if (rw_mappings > 0) md->pvh_attrs |= PVF_WRITE; /* color conflict. evict from cache. */ pmap_flush_page(md, pa, PMAP_FLUSH_PRIMARY); /* the list can't be empty because this was a enter/modify */ pv = SLIST_FIRST(&md->pvh_list); if ((md->pvh_attrs & PVF_KMPAGE) == 0) { KASSERT(pv); /* * If there's only one mapped page, change color to the * page's new color and return. Restore the DIRTY bit * that was erased by pmap_flush_page. */ if (SLIST_NEXT(pv, pv_link) == NULL) { md->pvh_attrs &= PAGE_SIZE - 1; md->pvh_attrs |= (va & arm_cache_prefer_mask); if (md->pvh_attrs & PVF_DMOD) md->pvh_attrs |= PVF_DIRTY; PMAPCOUNT(vac_color_change); KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); KASSERT(!(md->pvh_attrs & PVF_MULTCLR)); return; } } bad_alias = true; md->pvh_attrs &= ~PVF_COLORED; md->pvh_attrs |= PVF_NC; PMAPCOUNT(vac_color_erase); KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); } fixup: KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); /* * Turn cacheing on/off for all pages. */ SLIST_FOREACH(pv, &md->pvh_list, pv_link) { struct l2_bucket * const l2b = pmap_get_l2_bucket(pv->pv_pmap, pv->pv_va); KASSERTMSG(l2b != NULL, "%#lx", va); pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(pv->pv_va)]; const pt_entry_t opte = *ptep; pt_entry_t npte = opte & ~L2_S_CACHE_MASK; if (bad_alias) { pv->pv_flags |= PVF_NC; } else { pv->pv_flags &= ~PVF_NC; npte |= pte_l2_s_cache_mode; } if (opte == npte) /* only update is there's a change */ continue; if (l2pte_valid_p(npte)) { pmap_tlb_flush_SE(pv->pv_pmap, pv->pv_va, pv->pv_flags); } l2pte_set(ptep, npte, opte); PTE_SYNC_CURRENT(pv->pv_pmap, ptep); } #endif /* !ARM_MMU_EXTENDED */ } #endif /* PMAP_CACHE_VIPT */ /* * Modify pte bits for all ptes corresponding to the given physical address. * We use `maskbits' rather than `clearbits' because we're always passing * constants and the latter would require an extra inversion at run-time. */ static void pmap_clearbit(struct vm_page_md *md, paddr_t pa, u_int maskbits) { struct pv_entry *pv; #ifdef PMAP_CACHE_VIPT const bool want_syncicache = PV_IS_EXEC_P(md->pvh_attrs); #ifdef ARM_MMU_EXTENDED const u_int execbits = (maskbits & PVF_EXEC) ? L2_XS_XN : 0; #else const u_int execbits = 0; bool need_vac_me_harder = false; bool need_syncicache = false; #endif #else const u_int execbits = 0; #endif NPDEBUG(PDB_BITS, printf("pmap_clearbit: md %p mask 0x%x\n", md, maskbits)); #ifdef PMAP_CACHE_VIPT /* * If we might want to sync the I-cache and we've modified it, * then we know we definitely need to sync or discard it. */ if (want_syncicache) { #ifdef ARM_MMU_EXTENDED if (md->pvh_attrs & PVF_MOD) md->pvh_attrs &= ~PVF_EXEC; #else need_syncicache = md->pvh_attrs & PVF_MOD; #endif } #endif KASSERT(pmap_page_locked_p(md)); /* * Clear saved attributes (modify, reference) */ md->pvh_attrs &= ~(maskbits & (PVF_MOD | PVF_REF)); if (SLIST_EMPTY(&md->pvh_list)) { #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) if (need_syncicache) { /* * No one has it mapped, so just discard it. The next * exec remapping will cause it to be synced. */ md->pvh_attrs &= ~PVF_EXEC; PMAPCOUNT(exec_discarded_clearbit); } #endif return; } /* * Loop over all current mappings setting/clearing as appropos */ SLIST_FOREACH(pv, &md->pvh_list, pv_link) { pmap_t pm = pv->pv_pmap; const vaddr_t va = pv->pv_va; const u_int oflags = pv->pv_flags; #ifndef ARM_MMU_EXTENDED /* * Kernel entries are unmanaged and as such not to be changed. */ if (PV_IS_KENTRY_P(oflags)) continue; #endif pv->pv_flags &= ~maskbits; pmap_release_page_lock(md); pmap_acquire_pmap_lock(pm); struct l2_bucket * const l2b = pmap_get_l2_bucket(pm, va); if (l2b == NULL) { pmap_release_pmap_lock(pm); pmap_acquire_page_lock(md); continue; } KASSERTMSG(l2b != NULL, "%#lx", va); pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(va)]; const pt_entry_t opte = *ptep; pt_entry_t npte = opte | execbits; KASSERT((opte & L2_XS_nG) == (pm == pmap_kernel() ? 0 : L2_XS_nG)); NPDEBUG(PDB_BITS, printf( "%s: pv %p, pm %p, va 0x%08lx, flag 0x%x\n", __func__, pv, pm, va, oflags)); if (maskbits & (PVF_WRITE|PVF_MOD)) { #ifdef PMAP_CACHE_VIVT if ((oflags & PVF_NC)) { /* * Entry is not cacheable: * * Don't turn caching on again if this is a * modified emulation. This would be * inconsitent with the settings created by * pmap_vac_me_harder(). Otherwise, it's safe * to re-enable cacheing. * * There's no need to call pmap_vac_me_harder() * here: all pages are losing their write * permission. */ if (maskbits & PVF_WRITE) { npte |= pte_l2_s_cache_mode; pv->pv_flags &= ~PVF_NC; } } else if (l2pte_writable_p(opte)) { /* * Entry is writable/cacheable: check if pmap * is current if it is flush it, otherwise it * won't be in the cache */ pmap_cache_wbinv_page(pm, va, (maskbits & PVF_REF) != 0, oflags|PVF_WRITE); } #endif /* make the pte read only */ npte = l2pte_set_readonly(npte); pmap_acquire_page_lock(md); #ifdef MULTIPROCESSOR pv = pmap_find_pv(md, pm, va); #endif if (pv != NULL && (maskbits & oflags & PVF_WRITE)) { /* * Keep alias accounting up to date */ if (pm == pmap_kernel()) { md->krw_mappings--; md->kro_mappings++; } else { md->urw_mappings--; md->uro_mappings++; } #ifdef PMAP_CACHE_VIPT if (arm_cache_prefer_mask != 0) { if (md->urw_mappings + md->krw_mappings == 0) { md->pvh_attrs &= ~PVF_WRITE; } else { PMAP_VALIDATE_MD_PAGE(md); } } #ifndef ARM_MMU_EXTENDED if (want_syncicache) need_syncicache = true; need_vac_me_harder = true; #endif #endif /* PMAP_CACHE_VIPT */ } pmap_release_page_lock(md); } if (maskbits & PVF_REF) { if (true #ifndef ARM_MMU_EXTENDED && (oflags & PVF_NC) == 0 #endif && (maskbits & (PVF_WRITE|PVF_MOD)) == 0 && l2pte_valid_p(npte)) { #ifdef PMAP_CACHE_VIVT /* * Check npte here; we may have already * done the wbinv above, and the validity * of the PTE is the same for opte and * npte. */ pmap_cache_wbinv_page(pm, va, true, oflags); #endif } /* * Make the PTE invalid so that we will take a * page fault the next time the mapping is * referenced. */ npte &= ~L2_TYPE_MASK; npte |= L2_TYPE_INV; } if (npte != opte) { l2pte_set(ptep, npte, opte); PTE_SYNC(ptep); /* Flush the TLB entry if a current pmap. */ pmap_tlb_flush_SE(pm, va, oflags); } pmap_release_pmap_lock(pm); pmap_acquire_page_lock(md); NPDEBUG(PDB_BITS, printf("pmap_clearbit: pm %p va 0x%lx opte 0x%08x npte 0x%08x\n", pm, va, opte, npte)); } #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) /* * If we need to sync the I-cache and we haven't done it yet, do it. */ if (need_syncicache) { pmap_release_page_lock(md); pmap_syncicache_page(md, pa); pmap_acquire_page_lock(md); PMAPCOUNT(exec_synced_clearbit); } /* * If we are changing this to read-only, we need to call vac_me_harder * so we can change all the read-only pages to cacheable. We pretend * this as a page deletion. */ if (need_vac_me_harder) { if (md->pvh_attrs & PVF_NC) pmap_vac_me_harder(md, pa, NULL, 0); } #endif /* PMAP_CACHE_VIPT && !ARM_MMU_EXTENDED */ } /* * pmap_clean_page() * * This is a local function used to work out the best strategy to clean * a single page referenced by its entry in the PV table. It's used by * pmap_copy_page, pmap_zero page and maybe some others later on. * * Its policy is effectively: * o If there are no mappings, we don't bother doing anything with the cache. * o If there is one mapping, we clean just that page. * o If there are multiple mappings, we clean the entire cache. * * So that some functions can be further optimised, it returns 0 if it didn't * clean the entire cache, or 1 if it did. * * XXX One bug in this routine is that if the pv_entry has a single page * mapped at 0x00000000 a whole cache clean will be performed rather than * just the 1 page. Since this should not occur in everyday use and if it does * it will just result in not the most efficient clean for the page. */ #ifdef PMAP_CACHE_VIVT static bool pmap_clean_page(struct vm_page_md *md, bool is_src) { struct pv_entry *pv; pmap_t pm_to_clean = NULL; bool cache_needs_cleaning = false; vaddr_t page_to_clean = 0; u_int flags = 0; /* * Since we flush the cache each time we change to a different * user vmspace, we only need to flush the page if it is in the * current pmap. */ KASSERT(pmap_page_locked_p(md)); SLIST_FOREACH(pv, &md->pvh_list, pv_link) { if (pmap_is_current(pv->pv_pmap)) { flags |= pv->pv_flags; /* * The page is mapped non-cacheable in * this map. No need to flush the cache. */ if (pv->pv_flags & PVF_NC) { #ifdef DIAGNOSTIC KASSERT(!cache_needs_cleaning); #endif break; } else if (is_src && (pv->pv_flags & PVF_WRITE) == 0) continue; if (cache_needs_cleaning) { page_to_clean = 0; break; } else { page_to_clean = pv->pv_va; pm_to_clean = pv->pv_pmap; } cache_needs_cleaning = true; } } if (page_to_clean) { pmap_cache_wbinv_page(pm_to_clean, page_to_clean, !is_src, flags | PVF_REF); } else if (cache_needs_cleaning) { pmap_t const pm = curproc->p_vmspace->vm_map.pmap; pmap_cache_wbinv_all(pm, flags); return true; } return false; } #endif #ifdef PMAP_CACHE_VIPT /* * Sync a page with the I-cache. Since this is a VIPT, we must pick the * right cache alias to make sure we flush the right stuff. */ void pmap_syncicache_page(struct vm_page_md *md, paddr_t pa) { pmap_t kpm = pmap_kernel(); const size_t way_size = arm_pcache.icache_type == CACHE_TYPE_PIPT ? PAGE_SIZE : arm_pcache.icache_way_size; NPDEBUG(PDB_EXEC, printf("pmap_syncicache_page: md=%p (attrs=%#x)\n", md, md->pvh_attrs)); /* * No need to clean the page if it's non-cached. */ #ifndef ARM_MMU_EXTENDED if (md->pvh_attrs & PVF_NC) return; KASSERT(arm_cache_prefer_mask == 0 || md->pvh_attrs & PVF_COLORED); #endif #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS if (way_size == PAGE_SIZE) { vaddr_t vdstp = KERNEL_BASE + (pa - physical_start); cpu_icache_sync_range(vdstp, way_size); return; } #endif /* * We don't worry about the color of the exec page, we map the * same page to pages in the way and then do the icache_sync on * the entire way making sure we are cleaned. */ pt_entry_t * const ptep = cpu_cdst_pte(0); const vaddr_t dstp = cpu_cdstp(0); const pt_entry_t npte = L2_S_PROTO | pa | pte_l2_s_cache_mode | L2_S_PROT(PTE_KERNEL, VM_PROT_READ|VM_PROT_WRITE); for (size_t i = 0, j = 0; i < way_size; i += PAGE_SIZE, j += PAGE_SIZE / L2_S_SIZE) { pmap_tlb_flush_SE(kpm, dstp + i, PVF_REF | PVF_EXEC); /* * Set up a PTE with to flush these cache lines. */ l2pte_set(ptep + j, npte, 0); } PTE_SYNC_RANGE(ptep, way_size / L2_S_SIZE); /* * Flush it. */ cpu_icache_sync_range(dstp, way_size); for (size_t i = 0, j = 0; i < way_size; i += PAGE_SIZE, j += PAGE_SIZE / L2_S_SIZE) { /* * Unmap the page(s). */ l2pte_reset(ptep + j); pmap_tlb_flush_SE(kpm, dstp + i, PVF_REF | PVF_EXEC); } PTE_SYNC_RANGE(ptep, way_size / L2_S_SIZE); md->pvh_attrs |= PVF_EXEC; PMAPCOUNT(exec_synced); } #ifndef ARM_MMU_EXTENDED void pmap_flush_page(struct vm_page_md *md, paddr_t pa, enum pmap_flush_op flush) { vsize_t va_offset, end_va; bool wbinv_p; if (arm_cache_prefer_mask == 0) return; switch (flush) { case PMAP_FLUSH_PRIMARY: if (md->pvh_attrs & PVF_MULTCLR) { va_offset = 0; end_va = arm_cache_prefer_mask; md->pvh_attrs &= ~PVF_MULTCLR; PMAPCOUNT(vac_flush_lots); } else { va_offset = md->pvh_attrs & arm_cache_prefer_mask; end_va = va_offset; PMAPCOUNT(vac_flush_one); } /* * Mark that the page is no longer dirty. */ md->pvh_attrs &= ~PVF_DIRTY; wbinv_p = true; break; case PMAP_FLUSH_SECONDARY: va_offset = 0; end_va = arm_cache_prefer_mask; wbinv_p = true; md->pvh_attrs &= ~PVF_MULTCLR; PMAPCOUNT(vac_flush_lots); break; case PMAP_CLEAN_PRIMARY: va_offset = md->pvh_attrs & arm_cache_prefer_mask; end_va = va_offset; wbinv_p = false; /* * Mark that the page is no longer dirty. */ if ((md->pvh_attrs & PVF_DMOD) == 0) md->pvh_attrs &= ~PVF_DIRTY; PMAPCOUNT(vac_clean_one); break; default: return; } KASSERT(!(md->pvh_attrs & PVF_NC)); NPDEBUG(PDB_VAC, printf("pmap_flush_page: md=%p (attrs=%#x)\n", md, md->pvh_attrs)); const size_t scache_line_size = arm_scache.dcache_line_size; for (; va_offset <= end_va; va_offset += PAGE_SIZE) { pt_entry_t * const ptep = cpu_cdst_pte(va_offset); const vaddr_t dstp = cpu_cdstp(va_offset); const pt_entry_t opte = *ptep; if (flush == PMAP_FLUSH_SECONDARY && va_offset == (md->pvh_attrs & arm_cache_prefer_mask)) continue; pmap_tlb_flush_SE(pmap_kernel(), dstp, PVF_REF | PVF_EXEC); /* * Set up a PTE with the right coloring to flush * existing cache entries. */ const pt_entry_t npte = L2_S_PROTO | pa | L2_S_PROT(PTE_KERNEL, VM_PROT_READ|VM_PROT_WRITE) | pte_l2_s_cache_mode; l2pte_set(ptep, npte, opte); PTE_SYNC(ptep); /* * Flush it. Make sure to flush secondary cache too since * bus_dma will ignore uncached pages. */ if (scache_line_size != 0) { cpu_dcache_wb_range(dstp, PAGE_SIZE); if (wbinv_p) { cpu_sdcache_wbinv_range(dstp, pa, PAGE_SIZE); cpu_dcache_inv_range(dstp, PAGE_SIZE); } else { cpu_sdcache_wb_range(dstp, pa, PAGE_SIZE); } } else { if (wbinv_p) { cpu_dcache_wbinv_range(dstp, PAGE_SIZE); } else { cpu_dcache_wb_range(dstp, PAGE_SIZE); } } /* * Restore the page table entry since we might have interrupted * pmap_zero_page or pmap_copy_page which was already using * this pte. */ if (opte) { l2pte_set(ptep, opte, npte); } else { l2pte_reset(ptep); } PTE_SYNC(ptep); pmap_tlb_flush_SE(pmap_kernel(), dstp, PVF_REF | PVF_EXEC); } } #endif /* ARM_MMU_EXTENDED */ #endif /* PMAP_CACHE_VIPT */ /* * Routine: pmap_page_remove * Function: * Removes this physical page from * all physical maps in which it resides. * Reflects back modify bits to the pager. */ static void pmap_page_remove(struct vm_page_md *md, paddr_t pa) { struct l2_bucket *l2b; struct pv_entry *pv; pt_entry_t *ptep; #ifndef ARM_MMU_EXTENDED bool flush = false; #endif u_int flags = 0; NPDEBUG(PDB_FOLLOW, printf("pmap_page_remove: md %p (0x%08lx)\n", md, pa)); struct pv_entry **pvp = &SLIST_FIRST(&md->pvh_list); pmap_acquire_page_lock(md); if (*pvp == NULL) { #ifdef PMAP_CACHE_VIPT /* * We *know* the page contents are about to be replaced. * Discard the exec contents */ if (PV_IS_EXEC_P(md->pvh_attrs)) PMAPCOUNT(exec_discarded_page_protect); md->pvh_attrs &= ~PVF_EXEC; PMAP_VALIDATE_MD_PAGE(md); #endif pmap_release_page_lock(md); return; } #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) KASSERT(arm_cache_prefer_mask == 0 || pmap_is_page_colored_p(md)); #endif /* * Clear alias counts */ #ifdef PMAP_CACHE_VIVT md->k_mappings = 0; #endif md->urw_mappings = md->uro_mappings = 0; #ifdef PMAP_CACHE_VIVT pmap_clean_page(md, false); #endif while ((pv = *pvp) != NULL) { pmap_t pm = pv->pv_pmap; #ifndef ARM_MMU_EXTENDED if (flush == false && pmap_is_current(pm)) flush = true; #endif if (pm == pmap_kernel()) { #ifdef PMAP_CACHE_VIPT /* * If this was unmanaged mapping, it must be preserved. * Move it back on the list and advance the end-of-list * pointer. */ if (PV_IS_KENTRY_P(pv->pv_flags)) { *pvp = pv; pvp = &SLIST_NEXT(pv, pv_link); continue; } if (pv->pv_flags & PVF_WRITE) md->krw_mappings--; else md->kro_mappings--; #endif PMAPCOUNT(kernel_unmappings); } *pvp = SLIST_NEXT(pv, pv_link); /* remove from list */ PMAPCOUNT(unmappings); pmap_release_page_lock(md); pmap_acquire_pmap_lock(pm); #ifdef ARM_MMU_EXTENDED pmap_tlb_invalidate_addr(pm, pv->pv_va); #endif l2b = pmap_get_l2_bucket(pm, pv->pv_va); KASSERTMSG(l2b != NULL, "%#lx", pv->pv_va); ptep = &l2b->l2b_kva[l2pte_index(pv->pv_va)]; /* * Update statistics */ --pm->pm_stats.resident_count; /* Wired bit */ if (pv->pv_flags & PVF_WIRED) --pm->pm_stats.wired_count; flags |= pv->pv_flags; /* * Invalidate the PTEs. */ l2pte_reset(ptep); PTE_SYNC_CURRENT(pm, ptep); pmap_free_l2_bucket(pm, l2b, PAGE_SIZE / L2_S_SIZE); pmap_release_pmap_lock(pm); pool_put(&pmap_pv_pool, pv); pmap_acquire_page_lock(md); #ifdef MULTIPROCESSOR /* * Restart of the beginning of the list. */ pvp = &SLIST_FIRST(&md->pvh_list); #endif } /* * if we reach the end of the list and there are still mappings, they * might be able to be cached now. And they must be kernel mappings. */ if (!SLIST_EMPTY(&md->pvh_list)) { pmap_vac_me_harder(md, pa, pmap_kernel(), 0); } #ifdef PMAP_CACHE_VIPT /* * Its EXEC cache is now gone. */ if (PV_IS_EXEC_P(md->pvh_attrs)) PMAPCOUNT(exec_discarded_page_protect); md->pvh_attrs &= ~PVF_EXEC; KASSERT(md->urw_mappings == 0); KASSERT(md->uro_mappings == 0); #ifndef ARM_MMU_EXTENDED if (arm_cache_prefer_mask != 0) { if (md->krw_mappings == 0) md->pvh_attrs &= ~PVF_WRITE; PMAP_VALIDATE_MD_PAGE(md); } #endif /* ARM_MMU_EXTENDED */ #endif /* PMAP_CACHE_VIPT */ pmap_release_page_lock(md); #ifndef ARM_MMU_EXTENDED if (flush) { /* * Note: We can't use pmap_tlb_flush{I,D}() here since that * would need a subsequent call to pmap_update() to ensure * curpm->pm_cstate.cs_all is reset. Our callers are not * required to do that (see pmap(9)), so we can't modify * the current pmap's state. */ if (PV_BEEN_EXECD(flags)) cpu_tlb_flushID(); else cpu_tlb_flushD(); } cpu_cpwait(); #endif /* ARM_MMU_EXTENDED */ } /* * pmap_t pmap_create(void) * * Create a new pmap structure from scratch. */ pmap_t pmap_create(void) { pmap_t pm; pm = pool_cache_get(&pmap_cache, PR_WAITOK); mutex_init(&pm->pm_obj_lock, MUTEX_DEFAULT, IPL_NONE); uvm_obj_init(&pm->pm_obj, NULL, false, 1); uvm_obj_setlock(&pm->pm_obj, &pm->pm_obj_lock); pm->pm_stats.wired_count = 0; pm->pm_stats.resident_count = 1; #ifdef ARM_MMU_EXTENDED #ifdef MULTIPROCESSOR kcpuset_create(&pm->pm_active, true); kcpuset_create(&pm->pm_onproc, true); #endif #else pm->pm_cstate.cs_all = 0; #endif pmap_alloc_l1(pm); /* * Note: The pool cache ensures that the pm_l2[] array is already * initialised to zero. */ pmap_pinit(pm); LIST_INSERT_HEAD(&pmap_pmaps, pm, pm_list); return (pm); } u_int arm32_mmap_flags(paddr_t pa) { /* * the upper 8 bits in pmap_enter()'s flags are reserved for MD stuff * and we're using the upper bits in page numbers to pass flags around * so we might as well use the same bits */ return (u_int)pa & PMAP_MD_MASK; } /* * int pmap_enter(pmap_t pm, vaddr_t va, paddr_t pa, vm_prot_t prot, * u_int flags) * * Insert the given physical page (p) at * the specified virtual address (v) in the * target physical map with the protection requested. * * NB: This is the only routine which MAY NOT lazy-evaluate * or lose information. That is, this routine must actually * insert this page into the given map NOW. */ int pmap_enter(pmap_t pm, vaddr_t va, paddr_t pa, vm_prot_t prot, u_int flags) { struct l2_bucket *l2b; struct vm_page *pg, *opg; u_int nflags; u_int oflags; const bool kpm_p = (pm == pmap_kernel()); #ifdef ARM_HAS_VBAR const bool vector_page_p = false; #else const bool vector_page_p = (va == vector_page); #endif UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist); UVMHIST_LOG(maphist, " (pm %p va %#x pa %#x prot #x", pm, va, pa, prot); UVMHIST_LOG(maphist, " flag %#x", flags, 0, 0, 0); KDASSERT((flags & PMAP_WIRED) == 0 || (flags & VM_PROT_ALL) != 0); KDASSERT(((va | pa) & PGOFSET) == 0); /* * Get a pointer to the page. Later on in this function, we * test for a managed page by checking pg != NULL. */ pg = pmap_initialized ? PHYS_TO_VM_PAGE(pa) : NULL; nflags = 0; if (prot & VM_PROT_WRITE) nflags |= PVF_WRITE; if (prot & VM_PROT_EXECUTE) nflags |= PVF_EXEC; if (flags & PMAP_WIRED) nflags |= PVF_WIRED; pmap_acquire_pmap_lock(pm); /* * Fetch the L2 bucket which maps this page, allocating one if * necessary for user pmaps. */ if (kpm_p) { l2b = pmap_get_l2_bucket(pm, va); } else { l2b = pmap_alloc_l2_bucket(pm, va); } if (l2b == NULL) { if (flags & PMAP_CANFAIL) { pmap_release_pmap_lock(pm); return (ENOMEM); } panic("pmap_enter: failed to allocate L2 bucket"); } pt_entry_t *ptep = &l2b->l2b_kva[l2pte_index(va)]; const pt_entry_t opte = *ptep; pt_entry_t npte = pa; oflags = 0; if (opte) { /* * There is already a mapping at this address. * If the physical address is different, lookup the * vm_page. */ if (l2pte_pa(opte) != pa) opg = PHYS_TO_VM_PAGE(l2pte_pa(opte)); else opg = pg; } else opg = NULL; if (pg) { struct vm_page_md *md = VM_PAGE_TO_MD(pg); /* * This is to be a managed mapping. */ pmap_acquire_page_lock(md); if ((flags & VM_PROT_ALL) || (md->pvh_attrs & PVF_REF)) { /* * - The access type indicates that we don't need * to do referenced emulation. * OR * - The physical page has already been referenced * so no need to re-do referenced emulation here. */ npte |= l2pte_set_readonly(L2_S_PROTO); nflags |= PVF_REF; if ((prot & VM_PROT_WRITE) != 0 && ((flags & VM_PROT_WRITE) != 0 || (md->pvh_attrs & PVF_MOD) != 0)) { /* * This is a writable mapping, and the * page's mod state indicates it has * already been modified. Make it * writable from the outset. */ npte = l2pte_set_writable(npte); nflags |= PVF_MOD; } #ifdef ARM_MMU_EXTENDED /* * If the page has been cleaned, then the pvh_attrs * will have PVF_EXEC set, so mark it execute so we * don't get an access fault when trying to execute * from it. */ if (md->pvh_attrs & nflags & PVF_EXEC) { npte &= ~L2_XS_XN; } #endif } else { /* * Need to do page referenced emulation. */ npte |= L2_TYPE_INV; } if (flags & ARM32_MMAP_WRITECOMBINE) { npte |= pte_l2_s_wc_mode; } else npte |= pte_l2_s_cache_mode; if (pg == opg) { /* * We're changing the attrs of an existing mapping. */ oflags = pmap_modify_pv(md, pa, pm, va, PVF_WRITE | PVF_EXEC | PVF_WIRED | PVF_MOD | PVF_REF, nflags); #ifdef PMAP_CACHE_VIVT /* * We may need to flush the cache if we're * doing rw-ro... */ if (pm->pm_cstate.cs_cache_d && (oflags & PVF_NC) == 0 && l2pte_writable_p(opte) && (prot & VM_PROT_WRITE) == 0) cpu_dcache_wb_range(va, PAGE_SIZE); #endif } else { struct pv_entry *pv; /* * New mapping, or changing the backing page * of an existing mapping. */ if (opg) { struct vm_page_md *omd = VM_PAGE_TO_MD(opg); paddr_t opa = VM_PAGE_TO_PHYS(opg); /* * Replacing an existing mapping with a new one. * It is part of our managed memory so we * must remove it from the PV list */ pv = pmap_remove_pv(omd, opa, pm, va); pmap_vac_me_harder(omd, opa, pm, 0); oflags = pv->pv_flags; #ifdef PMAP_CACHE_VIVT /* * If the old mapping was valid (ref/mod * emulation creates 'invalid' mappings * initially) then make sure to frob * the cache. */ if (!(oflags & PVF_NC) && l2pte_valid_p(opte)) { pmap_cache_wbinv_page(pm, va, true, oflags); } #endif } else if ((pv = pool_get(&pmap_pv_pool, PR_NOWAIT)) == NULL){ pmap_release_page_lock(md); if ((flags & PMAP_CANFAIL) == 0) panic("pmap_enter: no pv entries"); if (pm != pmap_kernel()) pmap_free_l2_bucket(pm, l2b, 0); pmap_release_pmap_lock(pm); UVMHIST_LOG(maphist, " <-- done (ENOMEM)", 0, 0, 0, 0); return (ENOMEM); } pmap_enter_pv(md, pa, pv, pm, va, nflags); } pmap_release_page_lock(md); } else { /* * We're mapping an unmanaged page. * These are always readable, and possibly writable, from * the get go as we don't need to track ref/mod status. */ npte |= l2pte_set_readonly(L2_S_PROTO); if (prot & VM_PROT_WRITE) npte = l2pte_set_writable(npte); /* * Make sure the vector table is mapped cacheable */ if ((vector_page_p && !kpm_p) || (flags & ARM32_MMAP_CACHEABLE)) { npte |= pte_l2_s_cache_mode; #ifdef ARM_MMU_EXTENDED npte &= ~L2_XS_XN; /* and executable */ #endif } else if (flags & ARM32_MMAP_WRITECOMBINE) { npte |= pte_l2_s_wc_mode; } if (opg) { /* * Looks like there's an existing 'managed' mapping * at this address. */ struct vm_page_md *omd = VM_PAGE_TO_MD(opg); paddr_t opa = VM_PAGE_TO_PHYS(opg); pmap_acquire_page_lock(omd); struct pv_entry *pv = pmap_remove_pv(omd, opa, pm, va); pmap_vac_me_harder(omd, opa, pm, 0); oflags = pv->pv_flags; pmap_release_page_lock(omd); #ifdef PMAP_CACHE_VIVT if (!(oflags & PVF_NC) && l2pte_valid_p(opte)) { pmap_cache_wbinv_page(pm, va, true, oflags); } #endif pool_put(&pmap_pv_pool, pv); } } /* * Make sure userland mappings get the right permissions */ if (!vector_page_p && !kpm_p) { npte |= L2_S_PROT_U; #ifdef ARM_MMU_EXTENDED npte |= L2_XS_nG; /* user pages are not global */ #endif } /* * Keep the stats up to date */ if (opte == 0) { l2b->l2b_occupancy += PAGE_SIZE / L2_S_SIZE; pm->pm_stats.resident_count++; } UVMHIST_LOG(maphist, " opte %#x npte %#x", opte, npte, 0, 0); /* * If this is just a wiring change, the two PTEs will be * identical, so there's no need to update the page table. */ if (npte != opte) { l2pte_set(ptep, npte, opte); PTE_SYNC(ptep); #ifndef ARM_MMU_EXTENDED bool is_cached = pmap_is_cached(pm); if (is_cached) { /* * We only need to frob the cache/tlb if this pmap * is current */ if (!vector_page_p && l2pte_valid_p(npte)) { /* * This mapping is likely to be accessed as * soon as we return to userland. Fix up the * L1 entry to avoid taking another * page/domain fault. */ pd_entry_t *pdep = pmap_l1_kva(pm) + l1pte_index(va); pd_entry_t pde = L1_C_PROTO | l2b->l2b_pa | L1_C_DOM(pmap_domain(pm)); if (*pdep != pde) { l1pte_setone(pdep, pde); PTE_SYNC(pdep); } } } #endif /* !ARMM_MMU_EXTENDED */ pmap_tlb_flush_SE(pm, va, oflags); #ifndef ARM_MMU_EXTENDED UVMHIST_LOG(maphist, " is_cached %d cs 0x%08x\n", is_cached, pm->pm_cstate.cs_all, 0, 0); #endif if (pg != NULL) { struct vm_page_md *md = VM_PAGE_TO_MD(pg); pmap_acquire_page_lock(md); pmap_vac_me_harder(md, pa, pm, va); pmap_release_page_lock(md); } } #if defined(PMAP_CACHE_VIPT) && defined(DIAGNOSTIC) if (pg) { struct vm_page_md *md = VM_PAGE_TO_MD(pg); pmap_acquire_page_lock(md); #ifndef ARM_MMU_EXTENDED KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); #endif PMAP_VALIDATE_MD_PAGE(md); pmap_release_page_lock(md); } #endif pmap_release_pmap_lock(pm); return (0); } /* * pmap_remove() * * pmap_remove is responsible for nuking a number of mappings for a range * of virtual address space in the current pmap. To do this efficiently * is interesting, because in a number of cases a wide virtual address * range may be supplied that contains few actual mappings. So, the * optimisations are: * 1. Skip over hunks of address space for which no L1 or L2 entry exists. * 2. Build up a list of pages we've hit, up to a maximum, so we can * maybe do just a partial cache clean. This path of execution is * complicated by the fact that the cache must be flushed _before_ * the PTE is nuked, being a VAC :-) * 3. If we're called after UVM calls pmap_remove_all(), we can defer * all invalidations until pmap_update(), since pmap_remove_all() has * already flushed the cache. * 4. Maybe later fast-case a single page, but I don't think this is * going to make _that_ much difference overall. */ #define PMAP_REMOVE_CLEAN_LIST_SIZE 3 void pmap_remove(pmap_t pm, vaddr_t sva, vaddr_t eva) { vaddr_t next_bucket; u_int cleanlist_idx, total, cnt; struct { vaddr_t va; pt_entry_t *ptep; } cleanlist[PMAP_REMOVE_CLEAN_LIST_SIZE]; u_int mappings; UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist); UVMHIST_LOG(maphist, " (pm=%p, sva=%#x, eva=%#x)", pm, sva, eva, 0); /* * we lock in the pmap => pv_head direction */ pmap_acquire_pmap_lock(pm); if (pm->pm_remove_all || !pmap_is_cached(pm)) { cleanlist_idx = PMAP_REMOVE_CLEAN_LIST_SIZE + 1; #ifndef ARM_MMU_EXTENDED if (pm->pm_cstate.cs_tlb == 0) pm->pm_remove_all = true; #endif } else cleanlist_idx = 0; total = 0; while (sva < eva) { /* * Do one L2 bucket's worth at a time. */ next_bucket = L2_NEXT_BUCKET_VA(sva); if (next_bucket > eva) next_bucket = eva; struct l2_bucket * const l2b = pmap_get_l2_bucket(pm, sva); if (l2b == NULL) { sva = next_bucket; continue; } pt_entry_t *ptep = &l2b->l2b_kva[l2pte_index(sva)]; for (mappings = 0; sva < next_bucket; sva += PAGE_SIZE, ptep += PAGE_SIZE / L2_S_SIZE) { pt_entry_t opte = *ptep; if (opte == 0) { /* Nothing here, move along */ continue; } u_int flags = PVF_REF; paddr_t pa = l2pte_pa(opte); struct vm_page * const pg = PHYS_TO_VM_PAGE(pa); /* * Update flags. In a number of circumstances, * we could cluster a lot of these and do a * number of sequential pages in one go. */ if (pg != NULL) { struct vm_page_md *md = VM_PAGE_TO_MD(pg); struct pv_entry *pv; pmap_acquire_page_lock(md); pv = pmap_remove_pv(md, pa, pm, sva); pmap_vac_me_harder(md, pa, pm, 0); pmap_release_page_lock(md); if (pv != NULL) { if (pm->pm_remove_all == false) { flags = pv->pv_flags; } pool_put(&pmap_pv_pool, pv); } } mappings += PAGE_SIZE / L2_S_SIZE; if (!l2pte_valid_p(opte)) { /* * Ref/Mod emulation is still active for this * mapping, therefore it is has not yet been * accessed. No need to frob the cache/tlb. */ l2pte_reset(ptep); PTE_SYNC_CURRENT(pm, ptep); continue; } #ifdef ARM_MMU_EXTENDED if (pm == pmap_kernel()) { l2pte_reset(ptep); PTE_SYNC(ptep); pmap_tlb_flush_SE(pm, sva, flags); continue; } #endif if (cleanlist_idx < PMAP_REMOVE_CLEAN_LIST_SIZE) { /* Add to the clean list. */ cleanlist[cleanlist_idx].ptep = ptep; cleanlist[cleanlist_idx].va = sva | (flags & PVF_EXEC); cleanlist_idx++; } else if (cleanlist_idx == PMAP_REMOVE_CLEAN_LIST_SIZE) { /* Nuke everything if needed. */ #ifdef PMAP_CACHE_VIVT pmap_cache_wbinv_all(pm, PVF_EXEC); #endif /* * Roll back the previous PTE list, * and zero out the current PTE. */ for (cnt = 0; cnt < PMAP_REMOVE_CLEAN_LIST_SIZE; cnt++) { l2pte_reset(cleanlist[cnt].ptep); PTE_SYNC(cleanlist[cnt].ptep); } l2pte_reset(ptep); PTE_SYNC(ptep); cleanlist_idx++; pm->pm_remove_all = true; } else { l2pte_reset(ptep); PTE_SYNC(ptep); if (pm->pm_remove_all == false) { pmap_tlb_flush_SE(pm, sva, flags); } } } /* * Deal with any left overs */ if (cleanlist_idx <= PMAP_REMOVE_CLEAN_LIST_SIZE) { total += cleanlist_idx; for (cnt = 0; cnt < cleanlist_idx; cnt++) { #ifdef ARM_MMU_EXTENDED vaddr_t clva = cleanlist[cnt].va; pmap_tlb_flush_SE(pm, clva, PVF_REF); #else vaddr_t va = cleanlist[cnt].va; if (pm->pm_cstate.cs_all != 0) { vaddr_t clva = va & ~PAGE_MASK; u_int flags = va & PVF_EXEC; #ifdef PMAP_CACHE_VIVT pmap_cache_wbinv_page(pm, clva, true, PVF_REF | PVF_WRITE | flags); #endif pmap_tlb_flush_SE(pm, clva, PVF_REF | flags); } #endif /* ARM_MMU_EXTENDED */ l2pte_reset(cleanlist[cnt].ptep); PTE_SYNC_CURRENT(pm, cleanlist[cnt].ptep); } /* * If it looks like we're removing a whole bunch * of mappings, it's faster to just write-back * the whole cache now and defer TLB flushes until * pmap_update() is called. */ if (total <= PMAP_REMOVE_CLEAN_LIST_SIZE) cleanlist_idx = 0; else { cleanlist_idx = PMAP_REMOVE_CLEAN_LIST_SIZE + 1; #ifdef PMAP_CACHE_VIVT pmap_cache_wbinv_all(pm, PVF_EXEC); #endif pm->pm_remove_all = true; } } pmap_free_l2_bucket(pm, l2b, mappings); pm->pm_stats.resident_count -= mappings; } pmap_release_pmap_lock(pm); } #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) static struct pv_entry * pmap_kremove_pg(struct vm_page *pg, vaddr_t va) { struct vm_page_md *md = VM_PAGE_TO_MD(pg); paddr_t pa = VM_PAGE_TO_PHYS(pg); struct pv_entry *pv; KASSERT(arm_cache_prefer_mask == 0 || md->pvh_attrs & (PVF_COLORED|PVF_NC)); KASSERT((md->pvh_attrs & PVF_KMPAGE) == 0); KASSERT(pmap_page_locked_p(md)); pv = pmap_remove_pv(md, pa, pmap_kernel(), va); KASSERTMSG(pv, "pg %p (pa #%lx) va %#lx", pg, pa, va); KASSERT(PV_IS_KENTRY_P(pv->pv_flags)); /* * If we are removing a writeable mapping to a cached exec page, * if it's the last mapping then clear it execness other sync * the page to the icache. */ if ((md->pvh_attrs & (PVF_NC|PVF_EXEC)) == PVF_EXEC && (pv->pv_flags & PVF_WRITE) != 0) { if (SLIST_EMPTY(&md->pvh_list)) { md->pvh_attrs &= ~PVF_EXEC; PMAPCOUNT(exec_discarded_kremove); } else { pmap_syncicache_page(md, pa); PMAPCOUNT(exec_synced_kremove); } } pmap_vac_me_harder(md, pa, pmap_kernel(), 0); return pv; } #endif /* PMAP_CACHE_VIPT && !ARM_MMU_EXTENDED */ /* * pmap_kenter_pa: enter an unmanaged, wired kernel mapping * * We assume there is already sufficient KVM space available * to do this, as we can't allocate L2 descriptor tables/metadata * from here. */ void pmap_kenter_pa(vaddr_t va, paddr_t pa, vm_prot_t prot, u_int flags) { #ifdef PMAP_CACHE_VIVT struct vm_page *pg = (flags & PMAP_KMPAGE) ? PHYS_TO_VM_PAGE(pa) : NULL; #endif #ifdef PMAP_CACHE_VIPT struct vm_page *pg = PHYS_TO_VM_PAGE(pa); struct vm_page *opg; #ifndef ARM_MMU_EXTENDED struct pv_entry *pv = NULL; #endif #endif struct vm_page_md *md = VM_PAGE_TO_MD(pg); UVMHIST_FUNC(__func__); if (pmap_initialized) { UVMHIST_CALLED(maphist); UVMHIST_LOG(maphist, " (va=%#x, pa=%#x, prot=%#x, flags=%#x", va, pa, prot, flags); } pmap_t kpm = pmap_kernel(); struct l2_bucket * const l2b = pmap_get_l2_bucket(kpm, va); const size_t l1slot __diagused = l1pte_index(va); KASSERTMSG(l2b != NULL, "va %#lx pa %#lx prot %d maxkvaddr %#lx: l2 %p l2b %p kva %p", va, pa, prot, pmap_curmaxkvaddr, kpm->pm_l2[L2_IDX(l1slot)], kpm->pm_l2[L2_IDX(l1slot)] ? &kpm->pm_l2[L2_IDX(l1slot)]->l2_bucket[L2_BUCKET(l1slot)] : NULL, kpm->pm_l2[L2_IDX(l1slot)] ? kpm->pm_l2[L2_IDX(l1slot)]->l2_bucket[L2_BUCKET(l1slot)].l2b_kva : NULL); KASSERT(l2b->l2b_kva != NULL); pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(va)]; const pt_entry_t opte = *ptep; if (opte == 0) { PMAPCOUNT(kenter_mappings); l2b->l2b_occupancy += PAGE_SIZE / L2_S_SIZE; } else { PMAPCOUNT(kenter_remappings); #ifdef PMAP_CACHE_VIPT opg = PHYS_TO_VM_PAGE(l2pte_pa(opte)); #ifdef DIAGNOSTIC struct vm_page_md *omd = VM_PAGE_TO_MD(opg); #endif if (opg && arm_cache_prefer_mask != 0) { KASSERT(opg != pg); KASSERT((omd->pvh_attrs & PVF_KMPAGE) == 0); KASSERT((flags & PMAP_KMPAGE) == 0); #ifndef ARM_MMU_EXTENDED pmap_acquire_page_lock(md); pv = pmap_kremove_pg(opg, va); pmap_release_page_lock(md); #endif } #endif if (l2pte_valid_p(opte)) { #ifdef PMAP_CACHE_VIVT cpu_dcache_wbinv_range(va, PAGE_SIZE); #endif cpu_tlb_flushD_SE(va); cpu_cpwait(); } } pt_entry_t npte = L2_S_PROTO | pa | L2_S_PROT(PTE_KERNEL, prot) | ((flags & PMAP_NOCACHE) ? 0 : ((flags & PMAP_PTE) ? pte_l2_s_cache_mode_pt : pte_l2_s_cache_mode)); #ifdef ARM_MMU_EXTENDED if (prot & VM_PROT_EXECUTE) npte &= ~L2_XS_XN; #endif l2pte_set(ptep, npte, opte); PTE_SYNC(ptep); if (pg) { if (flags & PMAP_KMPAGE) { KASSERT(md->urw_mappings == 0); KASSERT(md->uro_mappings == 0); KASSERT(md->krw_mappings == 0); KASSERT(md->kro_mappings == 0); #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) KASSERT(pv == NULL); KASSERT(arm_cache_prefer_mask == 0 || (va & PVF_COLORED) == 0); KASSERT((md->pvh_attrs & PVF_NC) == 0); /* if there is a color conflict, evict from cache. */ if (pmap_is_page_colored_p(md) && ((va ^ md->pvh_attrs) & arm_cache_prefer_mask)) { PMAPCOUNT(vac_color_change); pmap_flush_page(md, pa, PMAP_FLUSH_PRIMARY); } else if (md->pvh_attrs & PVF_MULTCLR) { /* * If this page has multiple colors, expunge * them. */ PMAPCOUNT(vac_flush_lots2); pmap_flush_page(md, pa, PMAP_FLUSH_SECONDARY); } pmap_acquire_page_lock(md); md->pvh_attrs &= PAGE_SIZE - 1; md->pvh_attrs |= PVF_KMPAGE | PVF_COLORED | PVF_DIRTY | (va & arm_cache_prefer_mask); #else /* !PMAP_CACHE_VIPT || ARM_MMU_EXTENDED */ pmap_acquire_page_lock(md); md->pvh_attrs |= PVF_KMPAGE; #endif pmap_kmpages++; pmap_release_page_lock(md); #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) } else if (arm_cache_prefer_mask != 0) { if (pv == NULL) { pv = pool_get(&pmap_pv_pool, PR_NOWAIT); KASSERT(pv != NULL); } pmap_acquire_page_lock(md); pmap_enter_pv(md, pa, pv, pmap_kernel(), va, PVF_WIRED | PVF_KENTRY | (prot & VM_PROT_WRITE ? PVF_WRITE : 0)); if ((prot & VM_PROT_WRITE) && !(md->pvh_attrs & PVF_NC)) md->pvh_attrs |= PVF_DIRTY; KASSERT((prot & VM_PROT_WRITE) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); pmap_vac_me_harder(md, pa, pmap_kernel(), va); pmap_release_page_lock(md); #endif } #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) } else { if (pv != NULL) pool_put(&pmap_pv_pool, pv); #endif } if (pmap_initialized) { UVMHIST_LOG(maphist, " <-- done (ptep %p: %#x -> %#x)", ptep, opte, npte, 0); } } void pmap_kremove(vaddr_t va, vsize_t len) { #ifdef UVMHIST u_int total_mappings = 0; #endif PMAPCOUNT(kenter_unmappings); UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist); UVMHIST_LOG(maphist, " (va=%#x, len=%#x)", va, len, 0, 0); const vaddr_t eva = va + len; while (va < eva) { vaddr_t next_bucket = L2_NEXT_BUCKET_VA(va); if (next_bucket > eva) next_bucket = eva; struct l2_bucket * const l2b = pmap_get_l2_bucket(pmap_kernel(), va); KDASSERT(l2b != NULL); pt_entry_t * const sptep = &l2b->l2b_kva[l2pte_index(va)]; pt_entry_t *ptep = sptep; u_int mappings = 0; while (va < next_bucket) { const pt_entry_t opte = *ptep; struct vm_page *opg = PHYS_TO_VM_PAGE(l2pte_pa(opte)); if (opg != NULL) { struct vm_page_md *omd = VM_PAGE_TO_MD(opg); pmap_acquire_page_lock(omd); if (omd->pvh_attrs & PVF_KMPAGE) { KASSERT(omd->urw_mappings == 0); KASSERT(omd->uro_mappings == 0); KASSERT(omd->krw_mappings == 0); KASSERT(omd->kro_mappings == 0); omd->pvh_attrs &= ~PVF_KMPAGE; #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) if (arm_cache_prefer_mask != 0) { omd->pvh_attrs &= ~PVF_WRITE; } #endif pmap_kmpages--; #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) } else if (arm_cache_prefer_mask != 0) { pool_put(&pmap_pv_pool, pmap_kremove_pg(opg, va)); #endif } pmap_release_page_lock(omd); } if (l2pte_valid_p(opte)) { #ifdef PMAP_CACHE_VIVT cpu_dcache_wbinv_range(va, PAGE_SIZE); #endif cpu_tlb_flushD_SE(va); } if (opte) { l2pte_reset(ptep); mappings += PAGE_SIZE / L2_S_SIZE; } va += PAGE_SIZE; ptep += PAGE_SIZE / L2_S_SIZE; } KDASSERT(mappings <= l2b->l2b_occupancy); l2b->l2b_occupancy -= mappings; PTE_SYNC_RANGE(sptep, (u_int)(ptep - sptep)); #ifdef UVMHIST total_mappings += mappings; #endif } cpu_cpwait(); UVMHIST_LOG(maphist, " <--- done (%u mappings removed)", total_mappings, 0, 0, 0); } bool pmap_extract(pmap_t pm, vaddr_t va, paddr_t *pap) { struct l2_dtable *l2; pd_entry_t *pdep, pde; pt_entry_t *ptep, pte; paddr_t pa; u_int l1slot; pmap_acquire_pmap_lock(pm); l1slot = l1pte_index(va); pdep = pmap_l1_kva(pm) + l1slot; pde = *pdep; if (l1pte_section_p(pde)) { /* * These should only happen for pmap_kernel() */ KDASSERT(pm == pmap_kernel()); pmap_release_pmap_lock(pm); #if (ARM_MMU_V6 + ARM_MMU_V7) > 0 if (l1pte_supersection_p(pde)) { pa = (pde & L1_SS_FRAME) | (va & L1_SS_OFFSET); } else #endif pa = (pde & L1_S_FRAME) | (va & L1_S_OFFSET); } else { /* * Note that we can't rely on the validity of the L1 * descriptor as an indication that a mapping exists. * We have to look it up in the L2 dtable. */ l2 = pm->pm_l2[L2_IDX(l1slot)]; if (l2 == NULL || (ptep = l2->l2_bucket[L2_BUCKET(l1slot)].l2b_kva) == NULL) { pmap_release_pmap_lock(pm); return false; } ptep = &ptep[l2pte_index(va)]; pte = *ptep; pmap_release_pmap_lock(pm); if (pte == 0) return false; switch (pte & L2_TYPE_MASK) { case L2_TYPE_L: pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET); break; default: pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET); break; } } if (pap != NULL) *pap = pa; return true; } void pmap_protect(pmap_t pm, vaddr_t sva, vaddr_t eva, vm_prot_t prot) { struct l2_bucket *l2b; vaddr_t next_bucket; NPDEBUG(PDB_PROTECT, printf("pmap_protect: pm %p sva 0x%lx eva 0x%lx prot 0x%x\n", pm, sva, eva, prot)); if ((prot & VM_PROT_READ) == 0) { pmap_remove(pm, sva, eva); return; } if (prot & VM_PROT_WRITE) { /* * If this is a read->write transition, just ignore it and let * uvm_fault() take care of it later. */ return; } pmap_acquire_pmap_lock(pm); const bool flush = eva - sva >= PAGE_SIZE * 4; u_int clr_mask = PVF_WRITE | ((prot & VM_PROT_EXECUTE) ? 0 : PVF_EXEC); u_int flags = 0; while (sva < eva) { next_bucket = L2_NEXT_BUCKET_VA(sva); if (next_bucket > eva) next_bucket = eva; l2b = pmap_get_l2_bucket(pm, sva); if (l2b == NULL) { sva = next_bucket; continue; } pt_entry_t *ptep = &l2b->l2b_kva[l2pte_index(sva)]; while (sva < next_bucket) { const pt_entry_t opte = *ptep; if (l2pte_valid_p(opte) && l2pte_writable_p(opte)) { struct vm_page *pg; u_int f; #ifdef PMAP_CACHE_VIVT /* * OK, at this point, we know we're doing * write-protect operation. If the pmap is * active, write-back the page. */ pmap_cache_wbinv_page(pm, sva, false, PVF_REF | PVF_WRITE); #endif pg = PHYS_TO_VM_PAGE(l2pte_pa(opte)); pt_entry_t npte = l2pte_set_readonly(opte); l2pte_set(ptep, npte, opte); PTE_SYNC(ptep); if (pg != NULL) { struct vm_page_md *md = VM_PAGE_TO_MD(pg); paddr_t pa = VM_PAGE_TO_PHYS(pg); pmap_acquire_page_lock(md); f = pmap_modify_pv(md, pa, pm, sva, clr_mask, 0); pmap_vac_me_harder(md, pa, pm, sva); pmap_release_page_lock(md); } else { f = PVF_REF | PVF_EXEC; } if (flush) { flags |= f; } else { pmap_tlb_flush_SE(pm, sva, f); } } sva += PAGE_SIZE; ptep += PAGE_SIZE / L2_S_SIZE; } } if (flush) { if (PV_BEEN_EXECD(flags)) { pmap_tlb_flushID(pm); } else if (PV_BEEN_REFD(flags)) { pmap_tlb_flushD(pm); } } pmap_release_pmap_lock(pm); } void pmap_icache_sync_range(pmap_t pm, vaddr_t sva, vaddr_t eva) { struct l2_bucket *l2b; pt_entry_t *ptep; vaddr_t next_bucket; vsize_t page_size = trunc_page(sva) + PAGE_SIZE - sva; NPDEBUG(PDB_EXEC, printf("pmap_icache_sync_range: pm %p sva 0x%lx eva 0x%lx\n", pm, sva, eva)); pmap_acquire_pmap_lock(pm); while (sva < eva) { next_bucket = L2_NEXT_BUCKET_VA(sva); if (next_bucket > eva) next_bucket = eva; l2b = pmap_get_l2_bucket(pm, sva); if (l2b == NULL) { sva = next_bucket; continue; } for (ptep = &l2b->l2b_kva[l2pte_index(sva)]; sva < next_bucket; sva += page_size, ptep += PAGE_SIZE / L2_S_SIZE, page_size = PAGE_SIZE) { if (l2pte_valid_p(*ptep)) { cpu_icache_sync_range(sva, min(page_size, eva - sva)); } } } pmap_release_pmap_lock(pm); } void pmap_page_protect(struct vm_page *pg, vm_prot_t prot) { struct vm_page_md *md = VM_PAGE_TO_MD(pg); paddr_t pa = VM_PAGE_TO_PHYS(pg); NPDEBUG(PDB_PROTECT, printf("pmap_page_protect: md %p (0x%08lx), prot 0x%x\n", md, pa, prot)); switch(prot) { case VM_PROT_READ|VM_PROT_WRITE: #if defined(ARM_MMU_EXTENDED) pmap_acquire_page_lock(md); pmap_clearbit(md, pa, PVF_EXEC); pmap_release_page_lock(md); break; #endif case VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE: break; case VM_PROT_READ: #if defined(ARM_MMU_EXTENDED) pmap_acquire_page_lock(md); pmap_clearbit(md, pa, PVF_WRITE|PVF_EXEC); pmap_release_page_lock(md); break; #endif case VM_PROT_READ|VM_PROT_EXECUTE: pmap_acquire_page_lock(md); pmap_clearbit(md, pa, PVF_WRITE); pmap_release_page_lock(md); break; default: pmap_page_remove(md, pa); break; } } /* * pmap_clear_modify: * * Clear the "modified" attribute for a page. */ bool pmap_clear_modify(struct vm_page *pg) { struct vm_page_md *md = VM_PAGE_TO_MD(pg); paddr_t pa = VM_PAGE_TO_PHYS(pg); bool rv; pmap_acquire_page_lock(md); if (md->pvh_attrs & PVF_MOD) { rv = true; #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) /* * If we are going to clear the modified bit and there are * no other modified bits set, flush the page to memory and * mark it clean. */ if ((md->pvh_attrs & (PVF_DMOD|PVF_NC)) == PVF_MOD) pmap_flush_page(md, pa, PMAP_CLEAN_PRIMARY); #endif pmap_clearbit(md, pa, PVF_MOD); } else { rv = false; } pmap_release_page_lock(md); return rv; } /* * pmap_clear_reference: * * Clear the "referenced" attribute for a page. */ bool pmap_clear_reference(struct vm_page *pg) { struct vm_page_md *md = VM_PAGE_TO_MD(pg); paddr_t pa = VM_PAGE_TO_PHYS(pg); bool rv; pmap_acquire_page_lock(md); if (md->pvh_attrs & PVF_REF) { rv = true; pmap_clearbit(md, pa, PVF_REF); } else { rv = false; } pmap_release_page_lock(md); return rv; } /* * pmap_is_modified: * * Test if a page has the "modified" attribute. */ /* See */ /* * pmap_is_referenced: * * Test if a page has the "referenced" attribute. */ /* See */ #if defined(ARM_MMU_EXTENDED) && 0 int pmap_prefetchabt_fixup(void *v) { struct trapframe * const tf = v; vaddr_t va = trunc_page(tf->tf_pc); int rv = ABORT_FIXUP_FAILED; if (!TRAP_USERMODE(tf) && va < VM_MAXUSER_ADDRESS) return rv; kpreempt_disable(); pmap_t pm = curcpu()->ci_pmap_cur; const size_t l1slot = l1pte_index(va); struct l2_dtable * const l2 = pm->pm_l2[L2_IDX(l1slot)]; if (l2 == NULL) goto out; struct l2_bucket * const l2b = &l2->l2_bucket[L2_BUCKET(l1slot)]; if (l2b->l2b_kva == NULL) goto out; /* * Check the PTE itself. */ pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(va)]; const pt_entry_t opte = *ptep; if ((opte & L2_S_PROT_U) == 0 || (opte & L2_XS_XN) == 0) goto out; paddr_t pa = l2pte_pa(pte); struct vm_page * const pg = PHYS_TO_VM_PAGE(pa); KASSERT(pg != NULL); struct vm_page_md * const md = VM_PAGE_TO_MD(pg); pmap_acquire_page_lock(md); struct pv_entry * const pv = pmap_find_pv(md, pm, va); KASSERT(pv != NULL); if (PV_IS_EXEC_P(pv->pv_flags)) { if (!PV_IS_EXEC_P(md->pvh_attrs)) { pmap_syncicache_page(md, pa); } rv = ABORT_FIXUP_RETURN; l2pte_set(ptep, opte & ~L2_XS_XN, opte); pmap_tlb_flush_SE(pm, va, PVF_EXEC | PVF_REF); } pmap_release_page_lock(md); out: kpreempt_enable(); return rv; } #endif int pmap_fault_fixup(pmap_t pm, vaddr_t va, vm_prot_t ftype, int user) { struct l2_dtable *l2; struct l2_bucket *l2b; paddr_t pa; const size_t l1slot = l1pte_index(va); int rv = 0; UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist); va = trunc_page(va); KASSERT(!user || (pm != pmap_kernel())); UVMHIST_LOG(maphist, " (pm=%#x, va=%#x, ftype=%#x, user=%d)", pm, va, ftype, user); #ifdef ARM_MMU_EXTENDED UVMHIST_LOG(maphist, " ti=%#x pai=%#x asid=%#x", cpu_tlb_info(curcpu()), PMAP_PAI(pm, cpu_tlb_info(curcpu())), PMAP_PAI(pm, cpu_tlb_info(curcpu()))->pai_asid, 0); #endif pmap_acquire_pmap_lock(pm); /* * If there is no l2_dtable for this address, then the process * has no business accessing it. * * Note: This will catch userland processes trying to access * kernel addresses. */ l2 = pm->pm_l2[L2_IDX(l1slot)]; if (l2 == NULL) { UVMHIST_LOG(maphist, " no l2 for l1slot %#x", l1slot, 0, 0, 0); goto out; } /* * Likewise if there is no L2 descriptor table */ l2b = &l2->l2_bucket[L2_BUCKET(l1slot)]; if (l2b->l2b_kva == NULL) { UVMHIST_LOG(maphist, " <-- done (no ptep for l1slot %#x)", l1slot, 0, 0, 0); goto out; } /* * Check the PTE itself. */ pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(va)]; pt_entry_t const opte = *ptep; if (opte == 0 || (opte & L2_TYPE_MASK) == L2_TYPE_L) { UVMHIST_LOG(maphist, " <-- done (empty pde for l1slot %#x)", l1slot, 0, 0, 0); goto out; } #ifndef ARM_HAS_VBAR /* * Catch a userland access to the vector page mapped at 0x0 */ if (user && (opte & L2_S_PROT_U) == 0) { UVMHIST_LOG(maphist, " <-- done (vector_page)", 0, 0, 0, 0); goto out; } #endif pa = l2pte_pa(opte); if ((ftype & VM_PROT_WRITE) && !l2pte_writable_p(opte)) { /* * This looks like a good candidate for "page modified" * emulation... */ struct pv_entry *pv; struct vm_page *pg; /* Extract the physical address of the page */ if ((pg = PHYS_TO_VM_PAGE(pa)) == NULL) { UVMHIST_LOG(maphist, " <-- done (mod/ref unmanaged page)", 0, 0, 0, 0); goto out; } struct vm_page_md *md = VM_PAGE_TO_MD(pg); /* Get the current flags for this page. */ pmap_acquire_page_lock(md); pv = pmap_find_pv(md, pm, va); if (pv == NULL || PV_IS_KENTRY_P(pv->pv_flags)) { pmap_release_page_lock(md); UVMHIST_LOG(maphist, " <-- done (mod/ref emul: no PV)", 0, 0, 0, 0); goto out; } /* * Do the flags say this page is writable? If not then it * is a genuine write fault. If yes then the write fault is * our fault as we did not reflect the write access in the * PTE. Now we know a write has occurred we can correct this * and also set the modified bit */ if ((pv->pv_flags & PVF_WRITE) == 0) { pmap_release_page_lock(md); goto out; } md->pvh_attrs |= PVF_REF | PVF_MOD; pv->pv_flags |= PVF_REF | PVF_MOD; #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) /* * If there are cacheable mappings for this page, mark it dirty. */ if ((md->pvh_attrs & PVF_NC) == 0) md->pvh_attrs |= PVF_DIRTY; #endif #ifdef ARM_MMU_EXTENDED if (md->pvh_attrs & PVF_EXEC) { md->pvh_attrs &= ~PVF_EXEC; PMAPCOUNT(exec_discarded_modfixup); } #endif pmap_release_page_lock(md); /* * Re-enable write permissions for the page. No need to call * pmap_vac_me_harder(), since this is just a * modified-emulation fault, and the PVF_WRITE bit isn't * changing. We've already set the cacheable bits based on * the assumption that we can write to this page. */ const pt_entry_t npte = l2pte_set_writable((opte & ~L2_TYPE_MASK) | L2_S_PROTO) #ifdef ARM_MMU_EXTENDED | (pm != pmap_kernel() ? L2_XS_nG : 0) #endif | 0; l2pte_set(ptep, npte, opte); PTE_SYNC(ptep); PMAPCOUNT(fixup_mod); rv = 1; UVMHIST_LOG(maphist, " <-- done (mod/ref emul: changed pte from %#x to %#x)", opte, npte, 0, 0); } else if ((opte & L2_TYPE_MASK) == L2_TYPE_INV) { /* * This looks like a good candidate for "page referenced" * emulation. */ struct vm_page *pg; /* Extract the physical address of the page */ if ((pg = PHYS_TO_VM_PAGE(pa)) == NULL) { UVMHIST_LOG(maphist, " <-- done (ref emul: unmanaged page)", 0, 0, 0, 0); goto out; } struct vm_page_md *md = VM_PAGE_TO_MD(pg); /* Get the current flags for this page. */ pmap_acquire_page_lock(md); struct pv_entry *pv = pmap_find_pv(md, pm, va); if (pv == NULL || PV_IS_KENTRY_P(pv->pv_flags)) { pmap_release_page_lock(md); UVMHIST_LOG(maphist, " <-- done (ref emul no PV)", 0, 0, 0, 0); goto out; } md->pvh_attrs |= PVF_REF; pv->pv_flags |= PVF_REF; pt_entry_t npte = l2pte_set_readonly((opte & ~L2_TYPE_MASK) | L2_S_PROTO); #ifdef ARM_MMU_EXTENDED if (pm != pmap_kernel()) { npte |= L2_XS_nG; } /* * If we got called from prefetch abort, then ftype will have * VM_PROT_EXECUTE set. Now see if we have no-execute set in * the PTE. */ if (user && (ftype & VM_PROT_EXECUTE) && (npte & L2_XS_XN)) { /* * Is this a mapping of an executable page? */ if ((pv->pv_flags & PVF_EXEC) == 0) { UVMHIST_LOG(maphist, " <-- done (ref emul: no exec)", 0, 0, 0, 0); goto out; } /* * If we haven't synced the page, do so now. */ if ((md->pvh_attrs & PVF_EXEC) == 0) { UVMHIST_LOG(maphist, " ref emul: syncicache page #%#x", pa, 0, 0, 0); pmap_syncicache_page(md, pa); PMAPCOUNT(fixup_exec); } npte &= ~L2_XS_XN; } #endif /* ARM_MMU_EXTENDED */ pmap_release_page_lock(md); l2pte_set(ptep, npte, opte); PTE_SYNC(ptep); PMAPCOUNT(fixup_ref); rv = 1; UVMHIST_LOG(maphist, " <-- done (ref emul: changed pte from %#x to %#x)", opte, npte, 0, 0); #ifdef ARM_MMU_EXTENDED } else if (user && (ftype & VM_PROT_EXECUTE) && (opte & L2_XS_XN)) { struct vm_page * const pg = PHYS_TO_VM_PAGE(pa); if (pg == NULL) { UVMHIST_LOG(maphist, " <-- done (unmanaged page)", 0, 0, 0, 0); goto out; } struct vm_page_md * const md = VM_PAGE_TO_MD(pg); /* Get the current flags for this page. */ pmap_acquire_page_lock(md); struct pv_entry * const pv = pmap_find_pv(md, pm, va); if (pv == NULL || (pv->pv_flags & PVF_EXEC) == 0) { pmap_release_page_lock(md); UVMHIST_LOG(maphist, " <-- done (no PV or not EXEC)", 0, 0, 0, 0); goto out; } /* * If we haven't synced the page, do so now. */ if ((md->pvh_attrs & PVF_EXEC) == 0) { UVMHIST_LOG(maphist, "syncicache page #%#x", pa, 0, 0, 0); pmap_syncicache_page(md, pa); } pmap_release_page_lock(md); /* * Turn off no-execute. */ KASSERT(opte & L2_XS_nG); l2pte_set(ptep, opte & ~L2_XS_XN, opte); PTE_SYNC(ptep); rv = 1; PMAPCOUNT(fixup_exec); UVMHIST_LOG(maphist, "exec: changed pte from %#x to %#x", opte, opte & ~L2_XS_XN, 0, 0); #endif } #ifndef ARM_MMU_EXTENDED /* * We know there is a valid mapping here, so simply * fix up the L1 if necessary. */ pd_entry_t * const pdep = pmap_l1_kva(pm) + l1slot; pd_entry_t pde = L1_C_PROTO | l2b->l2b_pa | L1_C_DOM(pmap_domain(pm)); if (*pdep != pde) { l1pte_setone(pdep, pde); PTE_SYNC(pdep); rv = 1; PMAPCOUNT(fixup_pdes); } #endif #ifdef CPU_SA110 /* * There are bugs in the rev K SA110. This is a check for one * of them. */ if (rv == 0 && curcpu()->ci_arm_cputype == CPU_ID_SA110 && curcpu()->ci_arm_cpurev < 3) { /* Always current pmap */ if (l2pte_valid_p(opte)) { extern int kernel_debug; if (kernel_debug & 1) { struct proc *p = curlwp->l_proc; printf("prefetch_abort: page is already " "mapped - pte=%p *pte=%08x\n", ptep, opte); printf("prefetch_abort: pc=%08lx proc=%p " "process=%s\n", va, p, p->p_comm); printf("prefetch_abort: far=%08x fs=%x\n", cpu_faultaddress(), cpu_faultstatus()); } #ifdef DDB if (kernel_debug & 2) Debugger(); #endif rv = 1; } } #endif /* CPU_SA110 */ #ifndef ARM_MMU_EXTENDED /* * If 'rv == 0' at this point, it generally indicates that there is a * stale TLB entry for the faulting address. That might be due to a * wrong setting of pmap_needs_pte_sync. So set it and retry. */ if (rv == 0 && pm->pm_l1->l1_domain_use_count == 1 && pmap_needs_pte_sync == 0) { pmap_needs_pte_sync = 1; PTE_SYNC(ptep); PMAPCOUNT(fixup_ptesync); rv = 1; } #endif #if defined(DEBUG) || 1 /* * If 'rv == 0' at this point, it generally indicates that there is a * stale TLB entry for the faulting address. This happens when two or * more processes are sharing an L1. Since we don't flush the TLB on * a context switch between such processes, we can take domain faults * for mappings which exist at the same VA in both processes. EVEN IF * WE'VE RECENTLY FIXED UP THE CORRESPONDING L1 in pmap_enter(), for * example. * * This is extremely likely to happen if pmap_enter() updated the L1 * entry for a recently entered mapping. In this case, the TLB is * flushed for the new mapping, but there may still be TLB entries for * other mappings belonging to other processes in the 1MB range * covered by the L1 entry. * * Since 'rv == 0', we know that the L1 already contains the correct * value, so the fault must be due to a stale TLB entry. * * Since we always need to flush the TLB anyway in the case where we * fixed up the L1, or frobbed the L2 PTE, we effectively deal with * stale TLB entries dynamically. * * However, the above condition can ONLY happen if the current L1 is * being shared. If it happens when the L1 is unshared, it indicates * that other parts of the pmap are not doing their job WRT managing * the TLB. */ if (rv == 0 #ifndef ARM_MMU_EXTENDED && pm->pm_l1->l1_domain_use_count == 1 #endif && true) { #ifdef DEBUG extern int last_fault_code; #else int last_fault_code = ftype & VM_PROT_EXECUTE ? armreg_ifsr_read() : armreg_dfsr_read(); #endif printf("fixup: pm %p, va 0x%lx, ftype %d - nothing to do!\n", pm, va, ftype); printf("fixup: l2 %p, l2b %p, ptep %p, pte %#x\n", l2, l2b, ptep, opte); #ifndef ARM_MMU_EXTENDED printf("fixup: pdep %p, pde %#x, fsr %#x\n", pdep, pde, last_fault_code); #else printf("fixup: pdep %p, pde %#x, ttbcr %#x\n", &pmap_l1_kva(pm)[l1slot], pmap_l1_kva(pm)[l1slot], armreg_ttbcr_read()); printf("fixup: fsr %#x cpm %p casid %#x contextidr %#x dacr %#x\n", last_fault_code, curcpu()->ci_pmap_cur, curcpu()->ci_pmap_asid_cur, armreg_contextidr_read(), armreg_dacr_read()); #ifdef _ARM_ARCH_7 if (ftype & VM_PROT_WRITE) armreg_ats1cuw_write(va); else armreg_ats1cur_write(va); arm_isb(); printf("fixup: par %#x\n", armreg_par_read()); #endif #endif #ifdef DDB extern int kernel_debug; if (kernel_debug & 2) { pmap_release_pmap_lock(pm); #ifdef UVMHIST KERNHIST_DUMP(maphist); #endif cpu_Debugger(); pmap_acquire_pmap_lock(pm); } #endif } #endif pmap_tlb_flush_SE(pm, va, (ftype & VM_PROT_EXECUTE) ? PVF_EXEC | PVF_REF : PVF_REF); rv = 1; out: pmap_release_pmap_lock(pm); return (rv); } /* * Routine: pmap_procwr * * Function: * Synchronize caches corresponding to [addr, addr+len) in p. * */ void pmap_procwr(struct proc *p, vaddr_t va, int len) { /* We only need to do anything if it is the current process. */ if (p == curproc) cpu_icache_sync_range(va, len); } /* * Routine: pmap_unwire * Function: Clear the wired attribute for a map/virtual-address pair. * * In/out conditions: * The mapping must already exist in the pmap. */ void pmap_unwire(pmap_t pm, vaddr_t va) { struct l2_bucket *l2b; pt_entry_t *ptep, pte; struct vm_page *pg; paddr_t pa; NPDEBUG(PDB_WIRING, printf("pmap_unwire: pm %p, va 0x%08lx\n", pm, va)); pmap_acquire_pmap_lock(pm); l2b = pmap_get_l2_bucket(pm, va); KDASSERT(l2b != NULL); ptep = &l2b->l2b_kva[l2pte_index(va)]; pte = *ptep; /* Extract the physical address of the page */ pa = l2pte_pa(pte); if ((pg = PHYS_TO_VM_PAGE(pa)) != NULL) { /* Update the wired bit in the pv entry for this page. */ struct vm_page_md *md = VM_PAGE_TO_MD(pg); pmap_acquire_page_lock(md); (void) pmap_modify_pv(md, pa, pm, va, PVF_WIRED, 0); pmap_release_page_lock(md); } pmap_release_pmap_lock(pm); } void pmap_activate(struct lwp *l) { struct cpu_info * const ci = curcpu(); extern int block_userspace_access; pmap_t npm = l->l_proc->p_vmspace->vm_map.pmap; #ifdef ARM_MMU_EXTENDED struct pmap_asid_info * const pai = PMAP_PAI(npm, cpu_tlb_info(ci)); #endif UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist); UVMHIST_LOG(maphist, "(l=%#x) pm=%#x", l, npm, 0, 0); /* * If activating a non-current lwp or the current lwp is * already active, just return. */ if (false || l != curlwp #ifdef ARM_MMU_EXTENDED || (ci->ci_pmap_cur == npm && (npm == pmap_kernel() /* || PMAP_PAI_ASIDVALID_P(pai, cpu_tlb_info(ci)) */)) #else || npm->pm_activated == true #endif || false) { UVMHIST_LOG(maphist, " <-- (same pmap)", curlwp, l, 0, 0); return; } #ifndef ARM_MMU_EXTENDED const uint32_t ndacr = (DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2)) | (DOMAIN_CLIENT << (pmap_domain(npm) * 2)); /* * If TTB and DACR are unchanged, short-circuit all the * TLB/cache management stuff. */ pmap_t opm = ci->ci_lastlwp ? ci->ci_lastlwp->l_proc->p_vmspace->vm_map.pmap : NULL; if (opm != NULL) { uint32_t odacr = (DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2)) | (DOMAIN_CLIENT << (pmap_domain(opm) * 2)); if (opm->pm_l1 == npm->pm_l1 && odacr == ndacr) goto all_done; } #endif /* !ARM_MMU_EXTENDED */ PMAPCOUNT(activations); block_userspace_access = 1; #ifndef ARM_MMU_EXTENDED /* * If switching to a user vmspace which is different to the * most recent one, and the most recent one is potentially * live in the cache, we must write-back and invalidate the * entire cache. */ pmap_t rpm = ci->ci_pmap_lastuser; #endif /* * XXXSCW: There's a corner case here which can leave turds in the cache as * reported in kern/41058. They're probably left over during tear-down and * switching away from an exiting process. Until the root cause is identified * and fixed, zap the cache when switching pmaps. This will result in a few * unnecessary cache flushes, but that's better than silently corrupting data. */ #ifndef ARM_MMU_EXTENDED #if 0 if (npm != pmap_kernel() && rpm && npm != rpm && rpm->pm_cstate.cs_cache) { rpm->pm_cstate.cs_cache = 0; #ifdef PMAP_CACHE_VIVT cpu_idcache_wbinv_all(); #endif } #else if (rpm) { rpm->pm_cstate.cs_cache = 0; if (npm == pmap_kernel()) ci->ci_pmap_lastuser = NULL; #ifdef PMAP_CACHE_VIVT cpu_idcache_wbinv_all(); #endif } #endif /* No interrupts while we frob the TTB/DACR */ uint32_t oldirqstate = disable_interrupts(IF32_bits); #endif /* !ARM_MMU_EXTENDED */ #ifndef ARM_HAS_VBAR /* * For ARM_VECTORS_LOW, we MUST, I repeat, MUST fix up the L1 * entry corresponding to 'vector_page' in the incoming L1 table * before switching to it otherwise subsequent interrupts/exceptions * (including domain faults!) will jump into hyperspace. */ if (npm->pm_pl1vec != NULL) { cpu_tlb_flushID_SE((u_int)vector_page); cpu_cpwait(); *npm->pm_pl1vec = npm->pm_l1vec; PTE_SYNC(npm->pm_pl1vec); } #endif #ifdef ARM_MMU_EXTENDED /* * Assume that TTBR1 has only global mappings and TTBR0 only has * non-global mappings. To prevent speculation from doing evil things * we disable translation table walks using TTBR0 before setting the * CONTEXTIDR (ASID) or new TTBR0 value. Once both are set, table * walks are reenabled. */ UVMHIST_LOG(maphist, " acquiring asid", 0, 0, 0, 0); const uint32_t old_ttbcr = armreg_ttbcr_read(); armreg_ttbcr_write(old_ttbcr | TTBCR_S_PD0); arm_isb(); pmap_tlb_asid_acquire(npm, l); UVMHIST_LOG(maphist, " setting ttbr pa=%#x asid=%#x", npm->pm_l1_pa, pai->pai_asid, 0, 0); cpu_setttb(npm->pm_l1_pa, pai->pai_asid); /* * Now we can reenable tablewalks since the CONTEXTIDR and TTRB0 have * been updated. */ arm_isb(); if (npm != pmap_kernel()) { armreg_ttbcr_write(old_ttbcr & ~TTBCR_S_PD0); } cpu_cpwait(); ci->ci_pmap_asid_cur = pai->pai_asid; #else cpu_domains(ndacr); if (npm == pmap_kernel() || npm == rpm) { /* * Switching to a kernel thread, or back to the * same user vmspace as before... Simply update * the TTB (no TLB flush required) */ cpu_setttb(npm->pm_l1->l1_physaddr, false); cpu_cpwait(); } else { /* * Otherwise, update TTB and flush TLB */ cpu_context_switch(npm->pm_l1->l1_physaddr); if (rpm != NULL) rpm->pm_cstate.cs_tlb = 0; } restore_interrupts(oldirqstate); #endif /* ARM_MMU_EXTENDED */ block_userspace_access = 0; #ifndef ARM_MMU_EXTENDED all_done: /* * The new pmap is resident. Make sure it's marked * as resident in the cache/TLB. */ npm->pm_cstate.cs_all = PMAP_CACHE_STATE_ALL; if (npm != pmap_kernel()) ci->ci_pmap_lastuser = npm; /* The old pmap is not longer active */ if (opm != npm) { if (opm != NULL) opm->pm_activated = false; /* But the new one is */ npm->pm_activated = true; } #endif ci->ci_pmap_cur = npm; UVMHIST_LOG(maphist, " <-- done", 0, 0, 0, 0); } void pmap_deactivate(struct lwp *l) { pmap_t pm = l->l_proc->p_vmspace->vm_map.pmap; UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist); UVMHIST_LOG(maphist, "(l=%#x) pm=%#x", l, pm, 0, 0); #ifdef ARM_MMU_EXTENDED kpreempt_disable(); struct cpu_info * const ci = curcpu(); struct pmap_asid_info * const pai = PMAP_PAI(pm, cpu_tlb_info(ci)); /* * Disable translation table walks from TTBR0 while no pmap has been * activated. */ const uint32_t old_ttbcr = armreg_ttbcr_read(); armreg_ttbcr_write(old_ttbcr | TTBCR_S_PD0); arm_isb(); pmap_tlb_asid_deactivate(pm); cpu_setttb(pmap_kernel()->pm_l1_pa, pai->pai_asid); ci->ci_pmap_cur = pmap_kernel(); kpreempt_enable(); #else /* * If the process is exiting, make sure pmap_activate() does * a full MMU context-switch and cache flush, which we might * otherwise skip. See PR port-arm/38950. */ if (l->l_proc->p_sflag & PS_WEXIT) curcpu()->ci_lastlwp = NULL; pm->pm_activated = false; #endif UVMHIST_LOG(maphist, " <-- done", 0, 0, 0, 0); } void pmap_update(pmap_t pm) { if (pm->pm_remove_all) { #ifdef ARM_MMU_EXTENDED KASSERTMSG(curcpu()->ci_pmap_cur != pm || pm->pm_pai[0].pai_asid == curcpu()->ci_pmap_asid_cur, "pmap/asid %p/%#x != %s cur pmap/asid %p/%#x", pm, pm->pm_pai[0].pai_asid, curcpu()->ci_data.cpu_name, curcpu()->ci_pmap_cur, curcpu()->ci_pmap_asid_cur); /* * Finish up the pmap_remove_all() optimisation by flushing * all our ASIDs. */ pmap_tlb_asid_release_all(pm); #else /* * Finish up the pmap_remove_all() optimisation by flushing * the TLB. */ pmap_tlb_flushID(pm); #endif pm->pm_remove_all = false; } #ifdef ARM_MMU_EXTENDED #if defined(MULTIPROCESSOR) && PMAP_MAX_TLB > 1 u_int pending = atomic_swap_uint(&pmap->pm_shootdown_pending, 0); if (pending && pmap_tlb_shootdown_bystanders(pmap)) { PMAP_COUNT(shootdown_ipis); } #endif KASSERTMSG(curcpu()->ci_pmap_cur != pm || pm->pm_pai[0].pai_asid == curcpu()->ci_pmap_asid_cur, "pmap/asid %p/%#x != %s cur pmap/asid %p/%#x", pm, pm->pm_pai[0].pai_asid, curcpu()->ci_data.cpu_name, curcpu()->ci_pmap_cur, curcpu()->ci_pmap_asid_cur); #else if (pmap_is_current(pm)) { /* * If we're dealing with a current userland pmap, move its L1 * to the end of the LRU. */ if (pm != pmap_kernel()) pmap_use_l1(pm); /* * We can assume we're done with frobbing the cache/tlb for * now. Make sure any future pmap ops don't skip cache/tlb * flushes. */ pm->pm_cstate.cs_all = PMAP_CACHE_STATE_ALL; } #endif PMAPCOUNT(updates); /* * make sure TLB/cache operations have completed. */ cpu_cpwait(); } void pmap_remove_all(pmap_t pm) { /* * The vmspace described by this pmap is about to be torn down. * Until pmap_update() is called, UVM will only make calls * to pmap_remove(). We can make life much simpler by flushing * the cache now, and deferring TLB invalidation to pmap_update(). */ #ifdef PMAP_CACHE_VIVT pmap_cache_wbinv_all(pm, PVF_EXEC); #endif pm->pm_remove_all = true; } /* * Retire the given physical map from service. * Should only be called if the map contains no valid mappings. */ void pmap_destroy(pmap_t pm) { u_int count; if (pm == NULL) return; if (pm->pm_remove_all) { pmap_tlb_flushID(pm); pm->pm_remove_all = false; } /* * Drop reference count */ mutex_enter(pm->pm_lock); count = --pm->pm_obj.uo_refs; mutex_exit(pm->pm_lock); if (count > 0) { #ifndef ARM_MMU_EXTENDED if (pmap_is_current(pm)) { if (pm != pmap_kernel()) pmap_use_l1(pm); pm->pm_cstate.cs_all = PMAP_CACHE_STATE_ALL; } #endif return; } /* * reference count is zero, free pmap resources and then free pmap. */ #ifndef ARM_HAS_VBAR if (vector_page < KERNEL_BASE) { KDASSERT(!pmap_is_current(pm)); /* Remove the vector page mapping */ pmap_remove(pm, vector_page, vector_page + PAGE_SIZE); pmap_update(pm); } #endif LIST_REMOVE(pm, pm_list); pmap_free_l1(pm); #ifdef ARM_MMU_EXTENDED #ifdef MULTIPROCESSOR kcpuset_destroy(pm->pm_active); kcpuset_destroy(pm->pm_onproc); #endif #else struct cpu_info * const ci = curcpu(); if (ci->ci_pmap_lastuser == pm) ci->ci_pmap_lastuser = NULL; #endif uvm_obj_destroy(&pm->pm_obj, false); mutex_destroy(&pm->pm_obj_lock); pool_cache_put(&pmap_cache, pm); } /* * void pmap_reference(pmap_t pm) * * Add a reference to the specified pmap. */ void pmap_reference(pmap_t pm) { if (pm == NULL) return; #ifndef ARM_MMU_EXTENDED pmap_use_l1(pm); #endif mutex_enter(pm->pm_lock); pm->pm_obj.uo_refs++; mutex_exit(pm->pm_lock); } #if (ARM_MMU_V6 + ARM_MMU_V7) > 0 static struct evcnt pmap_prefer_nochange_ev = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "pmap prefer", "nochange"); static struct evcnt pmap_prefer_change_ev = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "pmap prefer", "change"); EVCNT_ATTACH_STATIC(pmap_prefer_change_ev); EVCNT_ATTACH_STATIC(pmap_prefer_nochange_ev); void pmap_prefer(vaddr_t hint, vaddr_t *vap, int td) { vsize_t mask = arm_cache_prefer_mask | (PAGE_SIZE - 1); vaddr_t va = *vap; vaddr_t diff = (hint - va) & mask; if (diff == 0) { pmap_prefer_nochange_ev.ev_count++; } else { pmap_prefer_change_ev.ev_count++; if (__predict_false(td)) va -= mask + 1; *vap = va + diff; } } #endif /* ARM_MMU_V6 | ARM_MMU_V7 */ /* * pmap_zero_page() * * Zero a given physical page by mapping it at a page hook point. * In doing the zero page op, the page we zero is mapped cachable, as with * StrongARM accesses to non-cached pages are non-burst making writing * _any_ bulk data very slow. */ #if (ARM_MMU_GENERIC + ARM_MMU_SA1 + ARM_MMU_V6 + ARM_MMU_V7) != 0 void pmap_zero_page_generic(paddr_t pa) { #if defined(PMAP_CACHE_VIPT) || defined(DEBUG) struct vm_page *pg = PHYS_TO_VM_PAGE(pa); struct vm_page_md *md = VM_PAGE_TO_MD(pg); #endif #if defined(PMAP_CACHE_VIPT) /* Choose the last page color it had, if any */ const vsize_t va_offset = md->pvh_attrs & arm_cache_prefer_mask; #else const vsize_t va_offset = 0; #endif #if defined(__HAVE_MM_MD_DIRECT_MAPPED_PHYS) /* * Is this page mapped at its natural color? * If we have all of memory mapped, then just convert PA to VA. */ const bool okcolor = arm_pcache.dcache_type == CACHE_TYPE_PIPT || va_offset == (pa & arm_cache_prefer_mask); const vaddr_t vdstp = okcolor ? KERNEL_BASE + (pa - physical_start) : cpu_cdstp(va_offset); #else const bool okcolor = false; const vaddr_t vdstp = cpu_cdstp(va_offset); #endif pt_entry_t * const ptep = cpu_cdst_pte(va_offset); #ifdef DEBUG if (!SLIST_EMPTY(&md->pvh_list)) panic("pmap_zero_page: page has mappings"); #endif KDASSERT((pa & PGOFSET) == 0); if (!okcolor) { /* * Hook in the page, zero it, and purge the cache for that * zeroed page. Invalidate the TLB as needed. */ const pt_entry_t npte = L2_S_PROTO | pa | pte_l2_s_cache_mode | L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE); l2pte_set(ptep, npte, 0); PTE_SYNC(ptep); cpu_tlb_flushD_SE(vdstp); cpu_cpwait(); #if defined(__HAVE_MM_MD_DIRECT_MAPPED_PHYS) && defined(PMAP_CACHE_VIPT) /* * If we are direct-mapped and our color isn't ok, then before * we bzero the page invalidate its contents from the cache and * reset the color to its natural color. */ cpu_dcache_inv_range(vdstp, PAGE_SIZE); md->pvh_attrs &= ~arm_cache_prefer_mask; md->pvh_attrs |= (pa & arm_cache_prefer_mask); #endif } bzero_page(vdstp); if (!okcolor) { /* * Unmap the page. */ l2pte_reset(ptep); PTE_SYNC(ptep); cpu_tlb_flushD_SE(vdstp); #ifdef PMAP_CACHE_VIVT cpu_dcache_wbinv_range(vdstp, PAGE_SIZE); #endif } #ifdef PMAP_CACHE_VIPT /* * This page is now cache resident so it now has a page color. * Any contents have been obliterated so clear the EXEC flag. */ #ifndef ARM_MMU_EXTENDED if (!pmap_is_page_colored_p(md)) { PMAPCOUNT(vac_color_new); md->pvh_attrs |= PVF_COLORED; } md->pvh_attrs |= PVF_DIRTY; #endif if (PV_IS_EXEC_P(md->pvh_attrs)) { md->pvh_attrs &= ~PVF_EXEC; PMAPCOUNT(exec_discarded_zero); } #endif } #endif /* (ARM_MMU_GENERIC + ARM_MMU_SA1 + ARM_MMU_V6) != 0 */ #if ARM_MMU_XSCALE == 1 void pmap_zero_page_xscale(paddr_t pa) { #ifdef DEBUG struct vm_page *pg = PHYS_TO_VM_PAGE(pa); struct vm_page_md *md = VM_PAGE_TO_MD(pg); if (!SLIST_EMPTY(&md->pvh_list)) panic("pmap_zero_page: page has mappings"); #endif KDASSERT((pa & PGOFSET) == 0); /* * Hook in the page, zero it, and purge the cache for that * zeroed page. Invalidate the TLB as needed. */ pt_entry_t npte = L2_S_PROTO | pa | L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE) | L2_C | L2_XS_T_TEX(TEX_XSCALE_X); /* mini-data */ l2pte_set(cdst_pte, npte, 0); PTE_SYNC(cdst_pte); cpu_tlb_flushD_SE(cdstp); cpu_cpwait(); bzero_page(cdstp); xscale_cache_clean_minidata(); l2pte_reset(cdst_pte); PTE_SYNC(cdst_pte); } #endif /* ARM_MMU_XSCALE == 1 */ /* pmap_pageidlezero() * * The same as above, except that we assume that the page is not * mapped. This means we never have to flush the cache first. Called * from the idle loop. */ bool pmap_pageidlezero(paddr_t pa) { bool rv = true; #if defined(PMAP_CACHE_VIPT) || defined(DEBUG) struct vm_page * const pg = PHYS_TO_VM_PAGE(pa); struct vm_page_md *md = VM_PAGE_TO_MD(pg); #endif #ifdef PMAP_CACHE_VIPT /* Choose the last page color it had, if any */ const vsize_t va_offset = md->pvh_attrs & arm_cache_prefer_mask; #else const vsize_t va_offset = 0; #endif #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS const bool okcolor = arm_pcache.dcache_type == CACHE_TYPE_PIPT || va_offset == (pa & arm_cache_prefer_mask); const vaddr_t vdstp = okcolor ? KERNEL_BASE + (pa - physical_start) : cpu_cdstp(va_offset); #else const bool okcolor = false; const vaddr_t vdstp = cpu_cdstp(va_offset); #endif pt_entry_t * const ptep = cpu_cdst_pte(va_offset); #ifdef DEBUG if (!SLIST_EMPTY(&md->pvh_list)) panic("pmap_pageidlezero: page has mappings"); #endif KDASSERT((pa & PGOFSET) == 0); if (!okcolor) { /* * Hook in the page, zero it, and purge the cache for that * zeroed page. Invalidate the TLB as needed. */ const pt_entry_t npte = L2_S_PROTO | pa | L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE) | pte_l2_s_cache_mode; l2pte_set(ptep, npte, 0); PTE_SYNC(ptep); cpu_tlb_flushD_SE(vdstp); cpu_cpwait(); } uint64_t *ptr = (uint64_t *)vdstp; for (size_t i = 0; i < PAGE_SIZE / sizeof(*ptr); i++) { if (sched_curcpu_runnable_p() != 0) { /* * A process has become ready. Abort now, * so we don't keep it waiting while we * do slow memory access to finish this * page. */ rv = false; break; } *ptr++ = 0; } #ifdef PMAP_CACHE_VIVT if (rv) /* * if we aborted we'll rezero this page again later so don't * purge it unless we finished it */ cpu_dcache_wbinv_range(vdstp, PAGE_SIZE); #elif defined(PMAP_CACHE_VIPT) /* * This page is now cache resident so it now has a page color. * Any contents have been obliterated so clear the EXEC flag. */ #ifndef ARM_MMU_EXTENDED if (!pmap_is_page_colored_p(md)) { PMAPCOUNT(vac_color_new); md->pvh_attrs |= PVF_COLORED; } #endif if (PV_IS_EXEC_P(md->pvh_attrs)) { md->pvh_attrs &= ~PVF_EXEC; PMAPCOUNT(exec_discarded_zero); } #endif /* * Unmap the page. */ if (!okcolor) { l2pte_reset(ptep); PTE_SYNC(ptep); cpu_tlb_flushD_SE(vdstp); } return rv; } /* * pmap_copy_page() * * Copy one physical page into another, by mapping the pages into * hook points. The same comment regarding cachability as in * pmap_zero_page also applies here. */ #if (ARM_MMU_GENERIC + ARM_MMU_SA1 + ARM_MMU_V6 + ARM_MMU_V7) != 0 void pmap_copy_page_generic(paddr_t src, paddr_t dst) { struct vm_page * const src_pg = PHYS_TO_VM_PAGE(src); struct vm_page_md *src_md = VM_PAGE_TO_MD(src_pg); #if defined(PMAP_CACHE_VIPT) || defined(DEBUG) struct vm_page * const dst_pg = PHYS_TO_VM_PAGE(dst); struct vm_page_md *dst_md = VM_PAGE_TO_MD(dst_pg); #endif #ifdef PMAP_CACHE_VIPT const vsize_t src_va_offset = src_md->pvh_attrs & arm_cache_prefer_mask; const vsize_t dst_va_offset = dst_md->pvh_attrs & arm_cache_prefer_mask; #else const vsize_t src_va_offset = 0; const vsize_t dst_va_offset = 0; #endif #if defined(__HAVE_MM_MD_DIRECT_MAPPED_PHYS) /* * Is this page mapped at its natural color? * If we have all of memory mapped, then just convert PA to VA. */ const bool src_okcolor = arm_pcache.dcache_type == CACHE_TYPE_PIPT || src_va_offset == (src & arm_cache_prefer_mask); const bool dst_okcolor = arm_pcache.dcache_type == CACHE_TYPE_PIPT || dst_va_offset == (dst & arm_cache_prefer_mask); const vaddr_t vsrcp = src_okcolor ? KERNEL_BASE + (src - physical_start) : cpu_csrcp(src_va_offset); const vaddr_t vdstp = KERNEL_BASE + (dst - physical_start); #else const bool src_okcolor = false; const bool dst_okcolor = false; const vaddr_t vsrcp = cpu_csrcp(src_va_offset); const vaddr_t vdstp = cpu_cdstp(dst_va_offset); #endif pt_entry_t * const src_ptep = cpu_csrc_pte(src_va_offset); pt_entry_t * const dst_ptep = cpu_cdst_pte(dst_va_offset); #ifdef DEBUG if (!SLIST_EMPTY(&dst_md->pvh_list)) panic("pmap_copy_page: dst page has mappings"); #endif #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) KASSERT(arm_cache_prefer_mask == 0 || src_md->pvh_attrs & (PVF_COLORED|PVF_NC)); #endif KDASSERT((src & PGOFSET) == 0); KDASSERT((dst & PGOFSET) == 0); /* * Clean the source page. Hold the source page's lock for * the duration of the copy so that no other mappings can * be created while we have a potentially aliased mapping. */ #ifdef PMAP_CACHE_VIVT pmap_acquire_page_lock(src_md); (void) pmap_clean_page(src_md, true); pmap_release_page_lock(src_md); #endif /* * Map the pages into the page hook points, copy them, and purge * the cache for the appropriate page. Invalidate the TLB * as required. */ if (!src_okcolor) { const pt_entry_t nsrc_pte = L2_S_PROTO | src #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) | ((src_md->pvh_attrs & PVF_NC) ? 0 : pte_l2_s_cache_mode) #else // defined(PMAP_CACHE_VIVT) || defined(ARM_MMU_EXTENDED) | pte_l2_s_cache_mode #endif | L2_S_PROT(PTE_KERNEL, VM_PROT_READ); l2pte_set(src_ptep, nsrc_pte, 0); PTE_SYNC(src_ptep); cpu_tlb_flushD_SE(vsrcp); cpu_cpwait(); } if (!dst_okcolor) { const pt_entry_t ndst_pte = L2_S_PROTO | dst | L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE) | pte_l2_s_cache_mode; l2pte_set(dst_ptep, ndst_pte, 0); PTE_SYNC(dst_ptep); cpu_tlb_flushD_SE(vdstp); cpu_cpwait(); #if defined(__HAVE_MM_MD_DIRECT_MAPPED_PHYS) && defined(PMAP_CACHE_VIPT) /* * If we are direct-mapped and our color isn't ok, then before * we bcopy to the new page invalidate its contents from the * cache and reset its color to its natural color. */ cpu_dcache_inv_range(vdstp, PAGE_SIZE); dst_md->pvh_attrs &= ~arm_cache_prefer_mask; dst_md->pvh_attrs |= (dst & arm_cache_prefer_mask); #endif } bcopy_page(vsrcp, vdstp); #ifdef PMAP_CACHE_VIVT cpu_dcache_inv_range(vsrcp, PAGE_SIZE); cpu_dcache_wbinv_range(vdstp, PAGE_SIZE); #endif /* * Unmap the pages. */ if (!src_okcolor) { l2pte_reset(src_ptep); PTE_SYNC(src_ptep); cpu_tlb_flushD_SE(vsrcp); cpu_cpwait(); } if (!dst_okcolor) { l2pte_reset(dst_ptep); PTE_SYNC(dst_ptep); cpu_tlb_flushD_SE(vdstp); cpu_cpwait(); } #ifdef PMAP_CACHE_VIPT /* * Now that the destination page is in the cache, mark it as colored. * If this was an exec page, discard it. */ pmap_acquire_page_lock(dst_md); #ifndef ARM_MMU_EXTENDED if (arm_pcache.cache_type == CACHE_TYPE_PIPT) { dst_md->pvh_attrs &= ~arm_cache_prefer_mask; dst_md->pvh_attrs |= (dst & arm_cache_prefer_mask); } if (!pmap_is_page_colored_p(dst_md)) { PMAPCOUNT(vac_color_new); dst_md->pvh_attrs |= PVF_COLORED; } dst_md->pvh_attrs |= PVF_DIRTY; #endif if (PV_IS_EXEC_P(dst_md->pvh_attrs)) { dst_md->pvh_attrs &= ~PVF_EXEC; PMAPCOUNT(exec_discarded_copy); } pmap_release_page_lock(dst_md); #endif } #endif /* (ARM_MMU_GENERIC + ARM_MMU_SA1 + ARM_MMU_V6) != 0 */ #if ARM_MMU_XSCALE == 1 void pmap_copy_page_xscale(paddr_t src, paddr_t dst) { struct vm_page *src_pg = PHYS_TO_VM_PAGE(src); struct vm_page_md *src_md = VM_PAGE_TO_MD(src_pg); #ifdef DEBUG struct vm_page_md *dst_md = VM_PAGE_TO_MD(PHYS_TO_VM_PAGE(dst)); if (!SLIST_EMPTY(&dst_md->pvh_list)) panic("pmap_copy_page: dst page has mappings"); #endif KDASSERT((src & PGOFSET) == 0); KDASSERT((dst & PGOFSET) == 0); /* * Clean the source page. Hold the source page's lock for * the duration of the copy so that no other mappings can * be created while we have a potentially aliased mapping. */ #ifdef PMAP_CACHE_VIVT pmap_acquire_page_lock(src_md); (void) pmap_clean_page(src_md, true); pmap_release_page_lock(src_md); #endif /* * Map the pages into the page hook points, copy them, and purge * the cache for the appropriate page. Invalidate the TLB * as required. */ *csrc_pte = L2_S_PROTO | src | L2_S_PROT(PTE_KERNEL, VM_PROT_READ) | L2_C | L2_XS_T_TEX(TEX_XSCALE_X); /* mini-data */ PTE_SYNC(csrc_pte); *cdst_pte = L2_S_PROTO | dst | L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE) | L2_C | L2_XS_T_TEX(TEX_XSCALE_X); /* mini-data */ PTE_SYNC(cdst_pte); cpu_tlb_flushD_SE(csrcp); cpu_tlb_flushD_SE(cdstp); cpu_cpwait(); bcopy_page(csrcp, cdstp); xscale_cache_clean_minidata(); } #endif /* ARM_MMU_XSCALE == 1 */ /* * void pmap_virtual_space(vaddr_t *start, vaddr_t *end) * * Return the start and end addresses of the kernel's virtual space. * These values are setup in pmap_bootstrap and are updated as pages * are allocated. */ void pmap_virtual_space(vaddr_t *start, vaddr_t *end) { *start = virtual_avail; *end = virtual_end; } /* * Helper function for pmap_grow_l2_bucket() */ static inline int pmap_grow_map(vaddr_t va, paddr_t *pap) { paddr_t pa; if (uvm.page_init_done == false) { #ifdef PMAP_STEAL_MEMORY pv_addr_t pv; pmap_boot_pagealloc(PAGE_SIZE, #ifdef PMAP_CACHE_VIPT arm_cache_prefer_mask, va & arm_cache_prefer_mask, #else 0, 0, #endif &pv); pa = pv.pv_pa; #else if (uvm_page_physget(&pa) == false) return (1); #endif /* PMAP_STEAL_MEMORY */ } else { struct vm_page *pg; pg = uvm_pagealloc(NULL, 0, NULL, UVM_PGA_USERESERVE); if (pg == NULL) return (1); pa = VM_PAGE_TO_PHYS(pg); #ifdef PMAP_CACHE_VIPT #ifdef DIAGNOSTIC struct vm_page_md *md = VM_PAGE_TO_MD(pg); #endif /* * This new page must not have any mappings. Enter it via * pmap_kenter_pa and let that routine do the hard work. */ KASSERT(SLIST_EMPTY(&md->pvh_list)); pmap_kenter_pa(va, pa, VM_PROT_READ|VM_PROT_WRITE, PMAP_KMPAGE|PMAP_PTE); #endif } if (pap) *pap = pa; PMAPCOUNT(pt_mappings); #ifdef DEBUG struct l2_bucket * const l2b = pmap_get_l2_bucket(pmap_kernel(), va); KDASSERT(l2b != NULL); pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(va)]; const pt_entry_t opte = *ptep; KDASSERT((opte & L2_S_CACHE_MASK) == pte_l2_s_cache_mode_pt); #endif memset((void *)va, 0, PAGE_SIZE); return (0); } /* * This is the same as pmap_alloc_l2_bucket(), except that it is only * used by pmap_growkernel(). */ static inline struct l2_bucket * pmap_grow_l2_bucket(pmap_t pm, vaddr_t va) { struct l2_dtable *l2; struct l2_bucket *l2b; u_short l1slot; vaddr_t nva; l1slot = l1pte_index(va); if ((l2 = pm->pm_l2[L2_IDX(l1slot)]) == NULL) { /* * No mapping at this address, as there is * no entry in the L1 table. * Need to allocate a new l2_dtable. */ nva = pmap_kernel_l2dtable_kva; if ((nva & PGOFSET) == 0) { /* * Need to allocate a backing page */ if (pmap_grow_map(nva, NULL)) return (NULL); } l2 = (struct l2_dtable *)nva; nva += sizeof(struct l2_dtable); if ((nva & PGOFSET) < (pmap_kernel_l2dtable_kva & PGOFSET)) { /* * The new l2_dtable straddles a page boundary. * Map in another page to cover it. */ if (pmap_grow_map(nva, NULL)) return (NULL); } pmap_kernel_l2dtable_kva = nva; /* * Link it into the parent pmap */ pm->pm_l2[L2_IDX(l1slot)] = l2; } l2b = &l2->l2_bucket[L2_BUCKET(l1slot)]; /* * Fetch pointer to the L2 page table associated with the address. */ if (l2b->l2b_kva == NULL) { pt_entry_t *ptep; /* * No L2 page table has been allocated. Chances are, this * is because we just allocated the l2_dtable, above. */ nva = pmap_kernel_l2ptp_kva; ptep = (pt_entry_t *)nva; if ((nva & PGOFSET) == 0) { /* * Need to allocate a backing page */ if (pmap_grow_map(nva, &pmap_kernel_l2ptp_phys)) return (NULL); PTE_SYNC_RANGE(ptep, PAGE_SIZE / sizeof(pt_entry_t)); } l2->l2_occupancy++; l2b->l2b_kva = ptep; l2b->l2b_l1slot = l1slot; l2b->l2b_pa = pmap_kernel_l2ptp_phys; pmap_kernel_l2ptp_kva += L2_TABLE_SIZE_REAL; pmap_kernel_l2ptp_phys += L2_TABLE_SIZE_REAL; } return (l2b); } vaddr_t pmap_growkernel(vaddr_t maxkvaddr) { pmap_t kpm = pmap_kernel(); #ifndef ARM_MMU_EXTENDED struct l1_ttable *l1; #endif int s; if (maxkvaddr <= pmap_curmaxkvaddr) goto out; /* we are OK */ NPDEBUG(PDB_GROWKERN, printf("pmap_growkernel: growing kernel from 0x%lx to 0x%lx\n", pmap_curmaxkvaddr, maxkvaddr)); KDASSERT(maxkvaddr <= virtual_end); /* * whoops! we need to add kernel PTPs */ s = splhigh(); /* to be safe */ mutex_enter(kpm->pm_lock); /* Map 1MB at a time */ size_t l1slot = l1pte_index(pmap_curmaxkvaddr); #ifdef ARM_MMU_EXTENDED pd_entry_t * const spdep = &kpm->pm_l1[l1slot]; pd_entry_t *pdep = spdep; #endif for (;pmap_curmaxkvaddr < maxkvaddr; pmap_curmaxkvaddr += L1_S_SIZE, #ifdef ARM_MMU_EXTENDED pdep++, #endif l1slot++) { struct l2_bucket *l2b = pmap_grow_l2_bucket(kpm, pmap_curmaxkvaddr); KASSERT(l2b != NULL); const pd_entry_t npde = L1_C_PROTO | l2b->l2b_pa | L1_C_DOM(PMAP_DOMAIN_KERNEL); #ifdef ARM_MMU_EXTENDED l1pte_setone(pdep, npde); #else /* Distribute new L1 entry to all other L1s */ SLIST_FOREACH(l1, &l1_list, l1_link) { pd_entry_t * const pdep = &l1->l1_kva[l1slot]; l1pte_setone(pdep, npde); PDE_SYNC(pdep); } #endif } #ifdef ARM_MMU_EXTENDED PDE_SYNC_RANGE(spdep, pdep - spdep); #endif #ifdef PMAP_CACHE_VIVT /* * flush out the cache, expensive but growkernel will happen so * rarely */ cpu_dcache_wbinv_all(); cpu_tlb_flushD(); cpu_cpwait(); #endif mutex_exit(kpm->pm_lock); splx(s); out: return (pmap_curmaxkvaddr); } /************************ Utility routines ****************************/ #ifndef ARM_HAS_VBAR /* * vector_page_setprot: * * Manipulate the protection of the vector page. */ void vector_page_setprot(int prot) { struct l2_bucket *l2b; pt_entry_t *ptep; #if defined(CPU_ARMV7) || defined(CPU_ARM11) /* * If we are using VBAR to use the vectors in the kernel, then it's * already mapped in the kernel text so no need to anything here. */ if (vector_page != ARM_VECTORS_LOW && vector_page != ARM_VECTORS_HIGH) { KASSERT((armreg_pfr1_read() & ARM_PFR1_SEC_MASK) != 0); return; } #endif l2b = pmap_get_l2_bucket(pmap_kernel(), vector_page); KASSERT(l2b != NULL); ptep = &l2b->l2b_kva[l2pte_index(vector_page)]; const pt_entry_t opte = *ptep; #ifdef ARM_MMU_EXTENDED const pt_entry_t npte = (opte & ~(L2_S_PROT_MASK|L2_XS_XN)) | L2_S_PROT(PTE_KERNEL, prot); #else const pt_entry_t npte = (opte & ~L2_S_PROT_MASK) | L2_S_PROT(PTE_KERNEL, prot); #endif l2pte_set(ptep, npte, opte); PTE_SYNC(ptep); cpu_tlb_flushD_SE(vector_page); cpu_cpwait(); } #endif /* * Fetch pointers to the PDE/PTE for the given pmap/VA pair. * Returns true if the mapping exists, else false. * * NOTE: This function is only used by a couple of arm-specific modules. * It is not safe to take any pmap locks here, since we could be right * in the middle of debugging the pmap anyway... * * It is possible for this routine to return false even though a valid * mapping does exist. This is because we don't lock, so the metadata * state may be inconsistent. * * NOTE: We can return a NULL *ptp in the case where the L1 pde is * a "section" mapping. */ bool pmap_get_pde_pte(pmap_t pm, vaddr_t va, pd_entry_t **pdp, pt_entry_t **ptp) { struct l2_dtable *l2; pd_entry_t *pdep, pde; pt_entry_t *ptep; u_short l1slot; if (pm->pm_l1 == NULL) return false; l1slot = l1pte_index(va); *pdp = pdep = pmap_l1_kva(pm) + l1slot; pde = *pdep; if (l1pte_section_p(pde)) { *ptp = NULL; return true; } l2 = pm->pm_l2[L2_IDX(l1slot)]; if (l2 == NULL || (ptep = l2->l2_bucket[L2_BUCKET(l1slot)].l2b_kva) == NULL) { return false; } *ptp = &ptep[l2pte_index(va)]; return true; } bool pmap_get_pde(pmap_t pm, vaddr_t va, pd_entry_t **pdp) { if (pm->pm_l1 == NULL) return false; *pdp = pmap_l1_kva(pm) + l1pte_index(va); return true; } /************************ Bootstrapping routines ****************************/ #ifndef ARM_MMU_EXTENDED static void pmap_init_l1(struct l1_ttable *l1, pd_entry_t *l1pt) { int i; l1->l1_kva = l1pt; l1->l1_domain_use_count = 0; l1->l1_domain_first = 0; for (i = 0; i < PMAP_DOMAINS; i++) l1->l1_domain_free[i] = i + 1; /* * Copy the kernel's L1 entries to each new L1. */ if (pmap_initialized) memcpy(l1pt, pmap_l1_kva(pmap_kernel()), L1_TABLE_SIZE); if (pmap_extract(pmap_kernel(), (vaddr_t)l1pt, &l1->l1_physaddr) == false) panic("pmap_init_l1: can't get PA of L1 at %p", l1pt); SLIST_INSERT_HEAD(&l1_list, l1, l1_link); TAILQ_INSERT_TAIL(&l1_lru_list, l1, l1_lru); } #endif /* !ARM_MMU_EXTENDED */ /* * pmap_bootstrap() is called from the board-specific initarm() routine * once the kernel L1/L2 descriptors tables have been set up. * * This is a somewhat convoluted process since pmap bootstrap is, effectively, * spread over a number of disparate files/functions. * * We are passed the following parameters * - kernel_l1pt * This is a pointer to the base of the kernel's L1 translation table. * - vstart * 1MB-aligned start of managed kernel virtual memory. * - vend * 1MB-aligned end of managed kernel virtual memory. * * We use the first parameter to build the metadata (struct l1_ttable and * struct l2_dtable) necessary to track kernel mappings. */ #define PMAP_STATIC_L2_SIZE 16 void pmap_bootstrap(vaddr_t vstart, vaddr_t vend) { static struct l2_dtable static_l2[PMAP_STATIC_L2_SIZE]; #ifndef ARM_MMU_EXTENDED static struct l1_ttable static_l1; struct l1_ttable *l1 = &static_l1; #endif struct l2_dtable *l2; struct l2_bucket *l2b; pd_entry_t *l1pt = (pd_entry_t *) kernel_l1pt.pv_va; pmap_t pm = pmap_kernel(); pt_entry_t *ptep; paddr_t pa; vsize_t size; int nptes, l2idx, l2next = 0; #ifdef ARM_MMU_EXTENDED KASSERT(pte_l1_s_cache_mode == pte_l1_s_cache_mode_pt); KASSERT(pte_l2_s_cache_mode == pte_l2_s_cache_mode_pt); #endif #ifdef VERBOSE_INIT_ARM printf("kpm "); #endif /* * Initialise the kernel pmap object */ curcpu()->ci_pmap_cur = pm; #ifdef ARM_MMU_EXTENDED pm->pm_l1 = l1pt; pm->pm_l1_pa = kernel_l1pt.pv_pa; #ifdef VERBOSE_INIT_ARM printf("tlb0 "); #endif pmap_tlb_info_init(&pmap_tlb0_info); #ifdef MULTIPROCESSOR #ifdef VERBOSE_INIT_ARM printf("kcpusets "); #endif pm->pm_onproc = kcpuset_running; pm->pm_active = kcpuset_running; #endif #else pm->pm_l1 = l1; #endif #ifdef VERBOSE_INIT_ARM printf("locks "); #endif mutex_init(&pmap_lock, MUTEX_DEFAULT, IPL_NONE); mutex_init(&pm->pm_obj_lock, MUTEX_DEFAULT, IPL_NONE); uvm_obj_init(&pm->pm_obj, NULL, false, 1); uvm_obj_setlock(&pm->pm_obj, &pm->pm_obj_lock); #ifdef VERBOSE_INIT_ARM printf("l1pt "); #endif /* * Scan the L1 translation table created by initarm() and create * the required metadata for all valid mappings found in it. */ for (size_t l1slot = 0; l1slot < L1_TABLE_SIZE / sizeof(pd_entry_t); l1slot++) { pd_entry_t pde = l1pt[l1slot]; /* * We're only interested in Coarse mappings. * pmap_extract() can deal with section mappings without * recourse to checking L2 metadata. */ if ((pde & L1_TYPE_MASK) != L1_TYPE_C) continue; /* * Lookup the KVA of this L2 descriptor table */ pa = l1pte_pa(pde); ptep = (pt_entry_t *)kernel_pt_lookup(pa); if (ptep == NULL) { panic("pmap_bootstrap: No L2 for va 0x%x, pa 0x%lx", (u_int)l1slot << L1_S_SHIFT, pa); } /* * Fetch the associated L2 metadata structure. * Allocate a new one if necessary. */ if ((l2 = pm->pm_l2[L2_IDX(l1slot)]) == NULL) { if (l2next == PMAP_STATIC_L2_SIZE) panic("pmap_bootstrap: out of static L2s"); pm->pm_l2[L2_IDX(l1slot)] = l2 = &static_l2[l2next++]; } /* * One more L1 slot tracked... */ l2->l2_occupancy++; /* * Fill in the details of the L2 descriptor in the * appropriate bucket. */ l2b = &l2->l2_bucket[L2_BUCKET(l1slot)]; l2b->l2b_kva = ptep; l2b->l2b_pa = pa; l2b->l2b_l1slot = l1slot; /* * Establish an initial occupancy count for this descriptor */ for (l2idx = 0; l2idx < (L2_TABLE_SIZE_REAL / sizeof(pt_entry_t)); l2idx++) { if ((ptep[l2idx] & L2_TYPE_MASK) != L2_TYPE_INV) { l2b->l2b_occupancy += PAGE_SIZE / L2_S_SIZE; } } /* * Make sure the descriptor itself has the correct cache mode. * If not, fix it, but whine about the problem. Port-meisters * should consider this a clue to fix up their initarm() * function. :) */ if (pmap_set_pt_cache_mode(l1pt, (vaddr_t)ptep, 1)) { printf("pmap_bootstrap: WARNING! wrong cache mode for " "L2 pte @ %p\n", ptep); } } #ifdef VERBOSE_INIT_ARM printf("cache(l1pt) "); #endif /* * Ensure the primary (kernel) L1 has the correct cache mode for * a page table. Bitch if it is not correctly set. */ if (pmap_set_pt_cache_mode(l1pt, kernel_l1pt.pv_va, L1_TABLE_SIZE / L2_S_SIZE)) { printf("pmap_bootstrap: WARNING! wrong cache mode for " "primary L1 @ 0x%lx\n", kernel_l1pt.pv_va); } #ifdef PMAP_CACHE_VIVT cpu_dcache_wbinv_all(); cpu_tlb_flushID(); cpu_cpwait(); #endif /* * now we allocate the "special" VAs which are used for tmp mappings * by the pmap (and other modules). we allocate the VAs by advancing * virtual_avail (note that there are no pages mapped at these VAs). * * Managed KVM space start from wherever initarm() tells us. */ virtual_avail = vstart; virtual_end = vend; #ifdef VERBOSE_INIT_ARM printf("specials "); #endif #ifdef PMAP_CACHE_VIPT /* * If we have a VIPT cache, we need one page/pte per possible alias * page so we won't violate cache aliasing rules. */ virtual_avail = (virtual_avail + arm_cache_prefer_mask) & ~arm_cache_prefer_mask; nptes = (arm_cache_prefer_mask >> L2_S_SHIFT) + 1; if (arm_pcache.icache_type != CACHE_TYPE_PIPT && arm_pcache.icache_way_size > nptes * L2_S_SIZE) { nptes = arm_pcache.icache_way_size >> L2_S_SHIFT; } #else nptes = PAGE_SIZE / L2_S_SIZE; #endif #ifdef MULTIPROCESSOR cnptes = nptes; nptes *= arm_cpu_max; #endif pmap_alloc_specials(&virtual_avail, nptes, &csrcp, &csrc_pte); pmap_set_pt_cache_mode(l1pt, (vaddr_t)csrc_pte, nptes); pmap_alloc_specials(&virtual_avail, nptes, &cdstp, &cdst_pte); pmap_set_pt_cache_mode(l1pt, (vaddr_t)cdst_pte, nptes); pmap_alloc_specials(&virtual_avail, nptes, &memhook, NULL); pmap_alloc_specials(&virtual_avail, round_page(MSGBUFSIZE) / PAGE_SIZE, (void *)&msgbufaddr, NULL); /* * Allocate a range of kernel virtual address space to be used * for L2 descriptor tables and metadata allocation in * pmap_growkernel(). */ size = ((virtual_end - pmap_curmaxkvaddr) + L1_S_OFFSET) / L1_S_SIZE; pmap_alloc_specials(&virtual_avail, round_page(size * L2_TABLE_SIZE_REAL) / PAGE_SIZE, &pmap_kernel_l2ptp_kva, NULL); size = (size + (L2_BUCKET_SIZE - 1)) / L2_BUCKET_SIZE; pmap_alloc_specials(&virtual_avail, round_page(size * sizeof(struct l2_dtable)) / PAGE_SIZE, &pmap_kernel_l2dtable_kva, NULL); #ifndef ARM_MMU_EXTENDED /* * init the static-global locks and global pmap list. */ mutex_init(&l1_lru_lock, MUTEX_DEFAULT, IPL_VM); /* * We can now initialise the first L1's metadata. */ SLIST_INIT(&l1_list); TAILQ_INIT(&l1_lru_list); pmap_init_l1(l1, l1pt); #endif /* ARM_MMU_EXTENDED */ #ifndef ARM_HAS_VBAR /* Set up vector page L1 details, if necessary */ if (vector_page < KERNEL_BASE) { pm->pm_pl1vec = pmap_l1_kva(pm) + l1pte_index(vector_page); l2b = pmap_get_l2_bucket(pm, vector_page); KDASSERT(l2b != NULL); pm->pm_l1vec = l2b->l2b_pa | L1_C_PROTO | L1_C_DOM(pmap_domain(pm)); } else pm->pm_pl1vec = NULL; #endif #ifdef VERBOSE_INIT_ARM printf("pools "); #endif /* * Initialize the pmap cache */ pool_cache_bootstrap(&pmap_cache, sizeof(struct pmap), 0, 0, 0, "pmappl", NULL, IPL_NONE, pmap_pmap_ctor, NULL, NULL); LIST_INIT(&pmap_pmaps); LIST_INSERT_HEAD(&pmap_pmaps, pm, pm_list); /* * Initialize the pv pool. */ pool_init(&pmap_pv_pool, sizeof(struct pv_entry), 0, 0, 0, "pvepl", &pmap_bootstrap_pv_allocator, IPL_NONE); /* * Initialize the L2 dtable pool and cache. */ pool_cache_bootstrap(&pmap_l2dtable_cache, sizeof(struct l2_dtable), 0, 0, 0, "l2dtblpl", NULL, IPL_NONE, pmap_l2dtable_ctor, NULL, NULL); /* * Initialise the L2 descriptor table pool and cache */ pool_cache_bootstrap(&pmap_l2ptp_cache, L2_TABLE_SIZE_REAL, 0, L2_TABLE_SIZE_REAL, 0, "l2ptppl", NULL, IPL_NONE, pmap_l2ptp_ctor, NULL, NULL); mutex_init(&memlock, MUTEX_DEFAULT, IPL_NONE); cpu_dcache_wbinv_all(); } static bool pmap_set_pt_cache_mode(pd_entry_t *kl1, vaddr_t va, size_t nptes) { #ifdef ARM_MMU_EXTENDED return false; #else if (pte_l1_s_cache_mode == pte_l1_s_cache_mode_pt && pte_l2_s_cache_mode == pte_l2_s_cache_mode_pt) return false; const vaddr_t eva = va + nptes * PAGE_SIZE; int rv = 0; while (va < eva) { /* * Make sure the descriptor itself has the correct cache mode */ pd_entry_t * const pdep = &kl1[l1pte_index(va)]; pd_entry_t pde = *pdep; if (l1pte_section_p(pde)) { __CTASSERT((L1_S_CACHE_MASK & L1_S_V6_SUPER) == 0); if ((pde & L1_S_CACHE_MASK) != pte_l1_s_cache_mode_pt) { *pdep = (pde & ~L1_S_CACHE_MASK) | pte_l1_s_cache_mode_pt; PDE_SYNC(pdep); cpu_dcache_wbinv_range((vaddr_t)pdep, sizeof(*pdep)); rv = 1; } return rv; if (pde & L1_S_V6_SUPER) { va = (va & -L1_SS_SIZE) + L1_SS_SIZE; } else { va = (va & -L1_S_SIZE) + L1_S_SIZE; } continue; } vaddr_t pa = l1pte_pa(pde); pt_entry_t *ptep = (pt_entry_t *)kernel_pt_lookup(pa); if (ptep == NULL) panic("pmap_bootstrap: No PTP for va %#lx\n", va); ptep += l2pte_index(va); const pt_entry_t opte = *ptep; if ((opte & L2_S_CACHE_MASK) != pte_l2_s_cache_mode_pt) { const pt_entry_t npte = (opte & ~L2_S_CACHE_MASK) | pte_l2_s_cache_mode_pt; l2pte_set(ptep, npte, opte); PTE_SYNC(ptep); cpu_dcache_wbinv_range((vaddr_t)ptep, sizeof(*ptep)); rv = 1; } va += PAGE_SIZE; } return (rv); #endif } static void pmap_alloc_specials(vaddr_t *availp, int pages, vaddr_t *vap, pt_entry_t **ptep) { vaddr_t va = *availp; struct l2_bucket *l2b; if (ptep) { l2b = pmap_get_l2_bucket(pmap_kernel(), va); if (l2b == NULL) panic("pmap_alloc_specials: no l2b for 0x%lx", va); if (ptep) *ptep = &l2b->l2b_kva[l2pte_index(va)]; } *vap = va; *availp = va + (PAGE_SIZE * pages); } void pmap_init(void) { /* * Set the available memory vars - These do not map to real memory * addresses and cannot as the physical memory is fragmented. * They are used by ps for %mem calculations. * One could argue whether this should be the entire memory or just * the memory that is useable in a user process. */ avail_start = ptoa(VM_PHYSMEM_PTR(0)->start); avail_end = ptoa(VM_PHYSMEM_PTR(vm_nphysseg - 1)->end); /* * Now we need to free enough pv_entry structures to allow us to get * the kmem_map/kmem_object allocated and inited (done after this * function is finished). to do this we allocate one bootstrap page out * of kernel_map and use it to provide an initial pool of pv_entry * structures. we never free this page. */ pool_setlowat(&pmap_pv_pool, (PAGE_SIZE / sizeof(struct pv_entry)) * 2); #ifdef ARM_MMU_EXTENDED pmap_tlb_info_evcnt_attach(&pmap_tlb0_info); #endif pmap_initialized = true; } static vaddr_t last_bootstrap_page = 0; static void *free_bootstrap_pages = NULL; static void * pmap_bootstrap_pv_page_alloc(struct pool *pp, int flags) { extern void *pool_page_alloc(struct pool *, int); vaddr_t new_page; void *rv; if (pmap_initialized) return (pool_page_alloc(pp, flags)); if (free_bootstrap_pages) { rv = free_bootstrap_pages; free_bootstrap_pages = *((void **)rv); return (rv); } KASSERT(kernel_map != NULL); new_page = uvm_km_alloc(kernel_map, PAGE_SIZE, 0, UVM_KMF_WIRED | ((flags & PR_WAITOK) ? 0 : UVM_KMF_NOWAIT)); KASSERT(new_page > last_bootstrap_page); last_bootstrap_page = new_page; return ((void *)new_page); } static void pmap_bootstrap_pv_page_free(struct pool *pp, void *v) { extern void pool_page_free(struct pool *, void *); if ((vaddr_t)v <= last_bootstrap_page) { *((void **)v) = free_bootstrap_pages; free_bootstrap_pages = v; return; } if (pmap_initialized) { pool_page_free(pp, v); return; } } /* * pmap_postinit() * * This routine is called after the vm and kmem subsystems have been * initialised. This allows the pmap code to perform any initialisation * that can only be done one the memory allocation is in place. */ void pmap_postinit(void) { #ifndef ARM_MMU_EXTENDED extern paddr_t physical_start, physical_end; struct l1_ttable *l1; struct pglist plist; struct vm_page *m; pd_entry_t *pdep; vaddr_t va, eva; u_int loop, needed; int error; #endif pool_cache_setlowat(&pmap_l2ptp_cache, (PAGE_SIZE / L2_TABLE_SIZE_REAL) * 4); pool_cache_setlowat(&pmap_l2dtable_cache, (PAGE_SIZE / sizeof(struct l2_dtable)) * 2); #ifndef ARM_MMU_EXTENDED needed = (maxproc / PMAP_DOMAINS) + ((maxproc % PMAP_DOMAINS) ? 1 : 0); needed -= 1; l1 = kmem_alloc(sizeof(*l1) * needed, KM_SLEEP); for (loop = 0; loop < needed; loop++, l1++) { /* Allocate a L1 page table */ va = uvm_km_alloc(kernel_map, L1_TABLE_SIZE, 0, UVM_KMF_VAONLY); if (va == 0) panic("Cannot allocate L1 KVM"); error = uvm_pglistalloc(L1_TABLE_SIZE, physical_start, physical_end, L1_TABLE_SIZE, 0, &plist, 1, 1); if (error) panic("Cannot allocate L1 physical pages"); m = TAILQ_FIRST(&plist); eva = va + L1_TABLE_SIZE; pdep = (pd_entry_t *)va; while (m && va < eva) { paddr_t pa = VM_PAGE_TO_PHYS(m); pmap_kenter_pa(va, pa, VM_PROT_READ|VM_PROT_WRITE, PMAP_KMPAGE|PMAP_PTE); va += PAGE_SIZE; m = TAILQ_NEXT(m, pageq.queue); } #ifdef DIAGNOSTIC if (m) panic("pmap_alloc_l1pt: pglist not empty"); #endif /* DIAGNOSTIC */ pmap_init_l1(l1, pdep); } #ifdef DEBUG printf("pmap_postinit: Allocated %d static L1 descriptor tables\n", needed); #endif #endif /* !ARM_MMU_EXTENDED */ } /* * Note that the following routines are used by board-specific initialisation * code to configure the initial kernel page tables. * * If ARM32_NEW_VM_LAYOUT is *not* defined, they operate on the assumption that * L2 page-table pages are 4KB in size and use 4 L1 slots. This mimics the * behaviour of the old pmap, and provides an easy migration path for * initial bring-up of the new pmap on existing ports. Fortunately, * pmap_bootstrap() compensates for this hackery. This is only a stop-gap and * will be deprecated. * * If ARM32_NEW_VM_LAYOUT *is* defined, these functions deal with 1KB L2 page * tables. */ /* * This list exists for the benefit of pmap_map_chunk(). It keeps track * of the kernel L2 tables during bootstrap, so that pmap_map_chunk() can * find them as necessary. * * Note that the data on this list MUST remain valid after initarm() returns, * as pmap_bootstrap() uses it to contruct L2 table metadata. */ SLIST_HEAD(, pv_addr) kernel_pt_list = SLIST_HEAD_INITIALIZER(kernel_pt_list); static vaddr_t kernel_pt_lookup(paddr_t pa) { pv_addr_t *pv; SLIST_FOREACH(pv, &kernel_pt_list, pv_list) { if (pv->pv_pa == (pa & ~PGOFSET)) return (pv->pv_va | (pa & PGOFSET)); } return (0); } /* * pmap_map_section: * * Create a single section mapping. */ void pmap_map_section(vaddr_t l1pt, vaddr_t va, paddr_t pa, int prot, int cache) { pd_entry_t * const pdep = (pd_entry_t *) l1pt; const size_t l1slot = l1pte_index(va); pd_entry_t fl; KASSERT(((va | pa) & L1_S_OFFSET) == 0); switch (cache) { case PTE_NOCACHE: default: fl = 0; break; case PTE_CACHE: fl = pte_l1_s_cache_mode; break; case PTE_PAGETABLE: fl = pte_l1_s_cache_mode_pt; break; } const pd_entry_t npde = L1_S_PROTO | pa | L1_S_PROT(PTE_KERNEL, prot) | fl | L1_S_DOM(PMAP_DOMAIN_KERNEL); l1pte_setone(pdep + l1slot, npde); PDE_SYNC(pdep + l1slot); } /* * pmap_map_entry: * * Create a single page mapping. */ void pmap_map_entry(vaddr_t l1pt, vaddr_t va, paddr_t pa, int prot, int cache) { pd_entry_t * const pdep = (pd_entry_t *) l1pt; const size_t l1slot = l1pte_index(va); pt_entry_t npte; pt_entry_t *ptep; KASSERT(((va | pa) & PGOFSET) == 0); switch (cache) { case PTE_NOCACHE: default: npte = 0; break; case PTE_CACHE: npte = pte_l2_s_cache_mode; break; case PTE_PAGETABLE: npte = pte_l2_s_cache_mode_pt; break; } if ((pdep[l1slot] & L1_TYPE_MASK) != L1_TYPE_C) panic("pmap_map_entry: no L2 table for VA 0x%08lx", va); ptep = (pt_entry_t *) kernel_pt_lookup(l1pte_pa(pdep[l1pte_index(va)])); if (ptep == NULL) panic("pmap_map_entry: can't find L2 table for VA 0x%08lx", va); npte |= L2_S_PROTO | pa | L2_S_PROT(PTE_KERNEL, prot); #ifdef ARM_MMU_EXTENDED if (prot & VM_PROT_EXECUTE) { npte &= ~L2_XS_XN; } #endif ptep += l2pte_index(va); l2pte_set(ptep, npte, 0); PTE_SYNC(ptep); } /* * pmap_link_l2pt: * * Link the L2 page table specified by "l2pv" into the L1 * page table at the slot for "va". */ void pmap_link_l2pt(vaddr_t l1pt, vaddr_t va, pv_addr_t *l2pv) { pd_entry_t * const pdep = (pd_entry_t *) l1pt + l1pte_index(va); KASSERT((va & ((L1_S_SIZE * (PAGE_SIZE / L2_T_SIZE)) - 1)) == 0); KASSERT((l2pv->pv_pa & PGOFSET) == 0); const pd_entry_t npde = L1_S_DOM(PMAP_DOMAIN_KERNEL) | L1_C_PROTO | l2pv->pv_pa; l1pte_set(pdep, npde); PDE_SYNC_RANGE(pdep, PAGE_SIZE / L2_T_SIZE); SLIST_INSERT_HEAD(&kernel_pt_list, l2pv, pv_list); } /* * pmap_map_chunk: * * Map a chunk of memory using the most efficient mappings * possible (section, large page, small page) into the * provided L1 and L2 tables at the specified virtual address. */ vsize_t pmap_map_chunk(vaddr_t l1pt, vaddr_t va, paddr_t pa, vsize_t size, int prot, int cache) { pd_entry_t * const pdep = (pd_entry_t *) l1pt; pt_entry_t f1, f2s, f2l; vsize_t resid; resid = (size + (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1); if (l1pt == 0) panic("pmap_map_chunk: no L1 table provided"); #ifdef VERBOSE_INIT_ARM printf("pmap_map_chunk: pa=0x%lx va=0x%lx size=0x%lx resid=0x%lx " "prot=0x%x cache=%d\n", pa, va, size, resid, prot, cache); #endif switch (cache) { case PTE_NOCACHE: default: f1 = 0; f2l = 0; f2s = 0; break; case PTE_CACHE: f1 = pte_l1_s_cache_mode; f2l = pte_l2_l_cache_mode; f2s = pte_l2_s_cache_mode; break; case PTE_PAGETABLE: f1 = pte_l1_s_cache_mode_pt; f2l = pte_l2_l_cache_mode_pt; f2s = pte_l2_s_cache_mode_pt; break; } size = resid; while (resid > 0) { const size_t l1slot = l1pte_index(va); #if (ARM_MMU_V6 + ARM_MMU_V7) > 0 /* See if we can use a supersection mapping. */ if (L1_SS_PROTO && L1_SS_MAPPABLE_P(va, pa, resid)) { /* Supersection are always domain 0 */ const pd_entry_t npde = L1_SS_PROTO | pa #ifdef ARM_MMU_EXTENDED_XXX | ((prot & VM_PROT_EXECUTE) ? 0 : L1_S_V6_XN) #endif | L1_S_PROT(PTE_KERNEL, prot) | f1; #ifdef VERBOSE_INIT_ARM printf("sS"); #endif l1pte_set(&pdep[l1slot], npde); PDE_SYNC_RANGE(&pdep[l1slot], L1_SS_SIZE / L1_S_SIZE); va += L1_SS_SIZE; pa += L1_SS_SIZE; resid -= L1_SS_SIZE; continue; } #endif /* See if we can use a section mapping. */ if (L1_S_MAPPABLE_P(va, pa, resid)) { const pd_entry_t npde = L1_S_PROTO | pa #ifdef ARM_MMU_EXTENDED_XXX | ((prot & VM_PROT_EXECUTE) ? 0 : L1_S_V6_XN) #endif | L1_S_PROT(PTE_KERNEL, prot) | f1 | L1_S_DOM(PMAP_DOMAIN_KERNEL); #ifdef VERBOSE_INIT_ARM printf("S"); #endif l1pte_set(&pdep[l1slot], npde); PDE_SYNC(&pdep[l1slot]); va += L1_S_SIZE; pa += L1_S_SIZE; resid -= L1_S_SIZE; continue; } /* * Ok, we're going to use an L2 table. Make sure * one is actually in the corresponding L1 slot * for the current VA. */ if ((pdep[l1slot] & L1_TYPE_MASK) != L1_TYPE_C) panic("%s: no L2 table for VA %#lx", __func__, va); pt_entry_t *ptep = (pt_entry_t *) kernel_pt_lookup(l1pte_pa(pdep[l1slot])); if (ptep == NULL) panic("%s: can't find L2 table for VA %#lx", __func__, va); ptep += l2pte_index(va); /* See if we can use a L2 large page mapping. */ if (L2_L_MAPPABLE_P(va, pa, resid)) { const pt_entry_t npte = L2_L_PROTO | pa #ifdef ARM_MMU_EXTENDED_XXX | ((prot & VM_PROT_EXECUTE) ? 0 : L2_XS_L_XN) #endif | L2_L_PROT(PTE_KERNEL, prot) | f2l; #ifdef VERBOSE_INIT_ARM printf("L"); #endif l2pte_set(ptep, npte, 0); PTE_SYNC_RANGE(ptep, L2_L_SIZE / L2_S_SIZE); va += L2_L_SIZE; pa += L2_L_SIZE; resid -= L2_L_SIZE; continue; } /* Use a small page mapping. */ #ifdef VERBOSE_INIT_ARM printf("P"); #endif const pt_entry_t npte = L2_S_PROTO | pa #ifdef ARM_MMU_EXTENDED_XXX | ((prot & VM_PROT_EXECUTE) ? 0 : L2_XS_XN) #endif | L2_S_PROT(PTE_KERNEL, prot) | f2s; l2pte_set(ptep, npte, 0); PTE_SYNC(ptep); va += PAGE_SIZE; pa += PAGE_SIZE; resid -= PAGE_SIZE; } #ifdef VERBOSE_INIT_ARM printf("\n"); #endif return (size); } /********************** Static device map routines ***************************/ static const struct pmap_devmap *pmap_devmap_table; /* * Register the devmap table. This is provided in case early console * initialization needs to register mappings created by bootstrap code * before pmap_devmap_bootstrap() is called. */ void pmap_devmap_register(const struct pmap_devmap *table) { pmap_devmap_table = table; } /* * Map all of the static regions in the devmap table, and remember * the devmap table so other parts of the kernel can look up entries * later. */ void pmap_devmap_bootstrap(vaddr_t l1pt, const struct pmap_devmap *table) { int i; pmap_devmap_table = table; for (i = 0; pmap_devmap_table[i].pd_size != 0; i++) { #ifdef VERBOSE_INIT_ARM printf("devmap: %08lx -> %08lx @ %08lx\n", pmap_devmap_table[i].pd_pa, pmap_devmap_table[i].pd_pa + pmap_devmap_table[i].pd_size - 1, pmap_devmap_table[i].pd_va); #endif pmap_map_chunk(l1pt, pmap_devmap_table[i].pd_va, pmap_devmap_table[i].pd_pa, pmap_devmap_table[i].pd_size, pmap_devmap_table[i].pd_prot, pmap_devmap_table[i].pd_cache); } } const struct pmap_devmap * pmap_devmap_find_pa(paddr_t pa, psize_t size) { uint64_t endpa; int i; if (pmap_devmap_table == NULL) return (NULL); endpa = (uint64_t)pa + (uint64_t)(size - 1); for (i = 0; pmap_devmap_table[i].pd_size != 0; i++) { if (pa >= pmap_devmap_table[i].pd_pa && endpa <= (uint64_t)pmap_devmap_table[i].pd_pa + (uint64_t)(pmap_devmap_table[i].pd_size - 1)) return (&pmap_devmap_table[i]); } return (NULL); } const struct pmap_devmap * pmap_devmap_find_va(vaddr_t va, vsize_t size) { int i; if (pmap_devmap_table == NULL) return (NULL); for (i = 0; pmap_devmap_table[i].pd_size != 0; i++) { if (va >= pmap_devmap_table[i].pd_va && va + size - 1 <= pmap_devmap_table[i].pd_va + pmap_devmap_table[i].pd_size - 1) return (&pmap_devmap_table[i]); } return (NULL); } /********************** PTE initialization routines **************************/ /* * These routines are called when the CPU type is identified to set up * the PTE prototypes, cache modes, etc. * * The variables are always here, just in case modules need to reference * them (though, they shouldn't). */ pt_entry_t pte_l1_s_cache_mode; pt_entry_t pte_l1_s_wc_mode; pt_entry_t pte_l1_s_cache_mode_pt; pt_entry_t pte_l1_s_cache_mask; pt_entry_t pte_l2_l_cache_mode; pt_entry_t pte_l2_l_wc_mode; pt_entry_t pte_l2_l_cache_mode_pt; pt_entry_t pte_l2_l_cache_mask; pt_entry_t pte_l2_s_cache_mode; pt_entry_t pte_l2_s_wc_mode; pt_entry_t pte_l2_s_cache_mode_pt; pt_entry_t pte_l2_s_cache_mask; pt_entry_t pte_l1_s_prot_u; pt_entry_t pte_l1_s_prot_w; pt_entry_t pte_l1_s_prot_ro; pt_entry_t pte_l1_s_prot_mask; pt_entry_t pte_l2_s_prot_u; pt_entry_t pte_l2_s_prot_w; pt_entry_t pte_l2_s_prot_ro; pt_entry_t pte_l2_s_prot_mask; pt_entry_t pte_l2_l_prot_u; pt_entry_t pte_l2_l_prot_w; pt_entry_t pte_l2_l_prot_ro; pt_entry_t pte_l2_l_prot_mask; pt_entry_t pte_l1_ss_proto; pt_entry_t pte_l1_s_proto; pt_entry_t pte_l1_c_proto; pt_entry_t pte_l2_s_proto; void (*pmap_copy_page_func)(paddr_t, paddr_t); void (*pmap_zero_page_func)(paddr_t); #if (ARM_MMU_GENERIC + ARM_MMU_SA1 + ARM_MMU_V6 + ARM_MMU_V7) != 0 void pmap_pte_init_generic(void) { pte_l1_s_cache_mode = L1_S_B|L1_S_C; pte_l1_s_wc_mode = L1_S_B; pte_l1_s_cache_mask = L1_S_CACHE_MASK_generic; pte_l2_l_cache_mode = L2_B|L2_C; pte_l2_l_wc_mode = L2_B; pte_l2_l_cache_mask = L2_L_CACHE_MASK_generic; pte_l2_s_cache_mode = L2_B|L2_C; pte_l2_s_wc_mode = L2_B; pte_l2_s_cache_mask = L2_S_CACHE_MASK_generic; /* * If we have a write-through cache, set B and C. If * we have a write-back cache, then we assume setting * only C will make those pages write-through (except for those * Cortex CPUs which can read the L1 caches). */ if (cpufuncs.cf_dcache_wb_range == (void *) cpufunc_nullop #if ARM_MMU_V7 > 0 || CPU_ID_CORTEX_P(curcpu()->ci_arm_cpuid) #endif #if ARM_MMU_V6 > 0 || CPU_ID_ARM11_P(curcpu()->ci_arm_cpuid) /* arm116 errata 399234 */ #endif || false) { pte_l1_s_cache_mode_pt = L1_S_B|L1_S_C; pte_l2_l_cache_mode_pt = L2_B|L2_C; pte_l2_s_cache_mode_pt = L2_B|L2_C; } else { pte_l1_s_cache_mode_pt = L1_S_C; /* write through */ pte_l2_l_cache_mode_pt = L2_C; /* write through */ pte_l2_s_cache_mode_pt = L2_C; /* write through */ } pte_l1_s_prot_u = L1_S_PROT_U_generic; pte_l1_s_prot_w = L1_S_PROT_W_generic; pte_l1_s_prot_ro = L1_S_PROT_RO_generic; pte_l1_s_prot_mask = L1_S_PROT_MASK_generic; pte_l2_s_prot_u = L2_S_PROT_U_generic; pte_l2_s_prot_w = L2_S_PROT_W_generic; pte_l2_s_prot_ro = L2_S_PROT_RO_generic; pte_l2_s_prot_mask = L2_S_PROT_MASK_generic; pte_l2_l_prot_u = L2_L_PROT_U_generic; pte_l2_l_prot_w = L2_L_PROT_W_generic; pte_l2_l_prot_ro = L2_L_PROT_RO_generic; pte_l2_l_prot_mask = L2_L_PROT_MASK_generic; pte_l1_ss_proto = L1_SS_PROTO_generic; pte_l1_s_proto = L1_S_PROTO_generic; pte_l1_c_proto = L1_C_PROTO_generic; pte_l2_s_proto = L2_S_PROTO_generic; pmap_copy_page_func = pmap_copy_page_generic; pmap_zero_page_func = pmap_zero_page_generic; } #if defined(CPU_ARM8) void pmap_pte_init_arm8(void) { /* * ARM8 is compatible with generic, but we need to use * the page tables uncached. */ pmap_pte_init_generic(); pte_l1_s_cache_mode_pt = 0; pte_l2_l_cache_mode_pt = 0; pte_l2_s_cache_mode_pt = 0; } #endif /* CPU_ARM8 */ #if defined(CPU_ARM9) && defined(ARM9_CACHE_WRITE_THROUGH) void pmap_pte_init_arm9(void) { /* * ARM9 is compatible with generic, but we want to use * write-through caching for now. */ pmap_pte_init_generic(); pte_l1_s_cache_mode = L1_S_C; pte_l2_l_cache_mode = L2_C; pte_l2_s_cache_mode = L2_C; pte_l1_s_wc_mode = L1_S_B; pte_l2_l_wc_mode = L2_B; pte_l2_s_wc_mode = L2_B; pte_l1_s_cache_mode_pt = L1_S_C; pte_l2_l_cache_mode_pt = L2_C; pte_l2_s_cache_mode_pt = L2_C; } #endif /* CPU_ARM9 && ARM9_CACHE_WRITE_THROUGH */ #endif /* (ARM_MMU_GENERIC + ARM_MMU_SA1 + ARM_MMU_V6) != 0 */ #if defined(CPU_ARM10) void pmap_pte_init_arm10(void) { /* * ARM10 is compatible with generic, but we want to use * write-through caching for now. */ pmap_pte_init_generic(); pte_l1_s_cache_mode = L1_S_B | L1_S_C; pte_l2_l_cache_mode = L2_B | L2_C; pte_l2_s_cache_mode = L2_B | L2_C; pte_l1_s_cache_mode = L1_S_B; pte_l2_l_cache_mode = L2_B; pte_l2_s_cache_mode = L2_B; pte_l1_s_cache_mode_pt = L1_S_C; pte_l2_l_cache_mode_pt = L2_C; pte_l2_s_cache_mode_pt = L2_C; } #endif /* CPU_ARM10 */ #if defined(CPU_ARM11) && defined(ARM11_CACHE_WRITE_THROUGH) void pmap_pte_init_arm11(void) { /* * ARM11 is compatible with generic, but we want to use * write-through caching for now. */ pmap_pte_init_generic(); pte_l1_s_cache_mode = L1_S_C; pte_l2_l_cache_mode = L2_C; pte_l2_s_cache_mode = L2_C; pte_l1_s_wc_mode = L1_S_B; pte_l2_l_wc_mode = L2_B; pte_l2_s_wc_mode = L2_B; pte_l1_s_cache_mode_pt = L1_S_C; pte_l2_l_cache_mode_pt = L2_C; pte_l2_s_cache_mode_pt = L2_C; } #endif /* CPU_ARM11 && ARM11_CACHE_WRITE_THROUGH */ #if ARM_MMU_SA1 == 1 void pmap_pte_init_sa1(void) { /* * The StrongARM SA-1 cache does not have a write-through * mode. So, do the generic initialization, then reset * the page table cache mode to B=1,C=1, and note that * the PTEs need to be sync'd. */ pmap_pte_init_generic(); pte_l1_s_cache_mode_pt = L1_S_B|L1_S_C; pte_l2_l_cache_mode_pt = L2_B|L2_C; pte_l2_s_cache_mode_pt = L2_B|L2_C; pmap_needs_pte_sync = 1; } #endif /* ARM_MMU_SA1 == 1*/ #if ARM_MMU_XSCALE == 1 #if (ARM_NMMUS > 1) static u_int xscale_use_minidata; #endif void pmap_pte_init_xscale(void) { uint32_t auxctl; int write_through = 0; pte_l1_s_cache_mode = L1_S_B|L1_S_C; pte_l1_s_wc_mode = L1_S_B; pte_l1_s_cache_mask = L1_S_CACHE_MASK_xscale; pte_l2_l_cache_mode = L2_B|L2_C; pte_l2_l_wc_mode = L2_B; pte_l2_l_cache_mask = L2_L_CACHE_MASK_xscale; pte_l2_s_cache_mode = L2_B|L2_C; pte_l2_s_wc_mode = L2_B; pte_l2_s_cache_mask = L2_S_CACHE_MASK_xscale; pte_l1_s_cache_mode_pt = L1_S_C; pte_l2_l_cache_mode_pt = L2_C; pte_l2_s_cache_mode_pt = L2_C; #ifdef XSCALE_CACHE_READ_WRITE_ALLOCATE /* * The XScale core has an enhanced mode where writes that * miss the cache cause a cache line to be allocated. This * is significantly faster than the traditional, write-through * behavior of this case. */ pte_l1_s_cache_mode |= L1_S_XS_TEX(TEX_XSCALE_X); pte_l2_l_cache_mode |= L2_XS_L_TEX(TEX_XSCALE_X); pte_l2_s_cache_mode |= L2_XS_T_TEX(TEX_XSCALE_X); #endif /* XSCALE_CACHE_READ_WRITE_ALLOCATE */ #ifdef XSCALE_CACHE_WRITE_THROUGH /* * Some versions of the XScale core have various bugs in * their cache units, the work-around for which is to run * the cache in write-through mode. Unfortunately, this * has a major (negative) impact on performance. So, we * go ahead and run fast-and-loose, in the hopes that we * don't line up the planets in a way that will trip the * bugs. * * However, we give you the option to be slow-but-correct. */ write_through = 1; #elif defined(XSCALE_CACHE_WRITE_BACK) /* force write back cache mode */ write_through = 0; #elif defined(CPU_XSCALE_PXA250) || defined(CPU_XSCALE_PXA270) /* * Intel PXA2[15]0 processors are known to have a bug in * write-back cache on revision 4 and earlier (stepping * A[01] and B[012]). Fixed for C0 and later. */ { uint32_t id, type; id = cpufunc_id(); type = id & ~(CPU_ID_XSCALE_COREREV_MASK|CPU_ID_REVISION_MASK); if (type == CPU_ID_PXA250 || type == CPU_ID_PXA210) { if ((id & CPU_ID_REVISION_MASK) < 5) { /* write through for stepping A0-1 and B0-2 */ write_through = 1; } } } #endif /* XSCALE_CACHE_WRITE_THROUGH */ if (write_through) { pte_l1_s_cache_mode = L1_S_C; pte_l2_l_cache_mode = L2_C; pte_l2_s_cache_mode = L2_C; } #if (ARM_NMMUS > 1) xscale_use_minidata = 1; #endif pte_l1_s_prot_u = L1_S_PROT_U_xscale; pte_l1_s_prot_w = L1_S_PROT_W_xscale; pte_l1_s_prot_ro = L1_S_PROT_RO_xscale; pte_l1_s_prot_mask = L1_S_PROT_MASK_xscale; pte_l2_s_prot_u = L2_S_PROT_U_xscale; pte_l2_s_prot_w = L2_S_PROT_W_xscale; pte_l2_s_prot_ro = L2_S_PROT_RO_xscale; pte_l2_s_prot_mask = L2_S_PROT_MASK_xscale; pte_l2_l_prot_u = L2_L_PROT_U_xscale; pte_l2_l_prot_w = L2_L_PROT_W_xscale; pte_l2_l_prot_ro = L2_L_PROT_RO_xscale; pte_l2_l_prot_mask = L2_L_PROT_MASK_xscale; pte_l1_ss_proto = L1_SS_PROTO_xscale; pte_l1_s_proto = L1_S_PROTO_xscale; pte_l1_c_proto = L1_C_PROTO_xscale; pte_l2_s_proto = L2_S_PROTO_xscale; pmap_copy_page_func = pmap_copy_page_xscale; pmap_zero_page_func = pmap_zero_page_xscale; /* * Disable ECC protection of page table access, for now. */ __asm volatile("mrc p15, 0, %0, c1, c0, 1" : "=r" (auxctl)); auxctl &= ~XSCALE_AUXCTL_P; __asm volatile("mcr p15, 0, %0, c1, c0, 1" : : "r" (auxctl)); } /* * xscale_setup_minidata: * * Set up the mini-data cache clean area. We require the * caller to allocate the right amount of physically and * virtually contiguous space. */ void xscale_setup_minidata(vaddr_t l1pt, vaddr_t va, paddr_t pa) { extern vaddr_t xscale_minidata_clean_addr; extern vsize_t xscale_minidata_clean_size; /* already initialized */ pd_entry_t *pde = (pd_entry_t *) l1pt; vsize_t size; uint32_t auxctl; xscale_minidata_clean_addr = va; /* Round it to page size. */ size = (xscale_minidata_clean_size + L2_S_OFFSET) & L2_S_FRAME; for (; size != 0; va += L2_S_SIZE, pa += L2_S_SIZE, size -= L2_S_SIZE) { const size_t l1slot = l1pte_index(va); pt_entry_t *ptep = (pt_entry_t *) kernel_pt_lookup(l1pte_pa(pde[l1slot])); if (ptep == NULL) panic("xscale_setup_minidata: can't find L2 table for " "VA 0x%08lx", va); ptep += l2pte_index(va); pt_entry_t opte = *ptep; l2pte_set(ptep, L2_S_PROTO | pa | L2_S_PROT(PTE_KERNEL, VM_PROT_READ) | L2_C | L2_XS_T_TEX(TEX_XSCALE_X), opte); } /* * Configure the mini-data cache for write-back with * read/write-allocate. * * NOTE: In order to reconfigure the mini-data cache, we must * make sure it contains no valid data! In order to do that, * we must issue a global data cache invalidate command! * * WE ASSUME WE ARE RUNNING UN-CACHED WHEN THIS ROUTINE IS CALLED! * THIS IS VERY IMPORTANT! */ /* Invalidate data and mini-data. */ __asm volatile("mcr p15, 0, %0, c7, c6, 0" : : "r" (0)); __asm volatile("mrc p15, 0, %0, c1, c0, 1" : "=r" (auxctl)); auxctl = (auxctl & ~XSCALE_AUXCTL_MD_MASK) | XSCALE_AUXCTL_MD_WB_RWA; __asm volatile("mcr p15, 0, %0, c1, c0, 1" : : "r" (auxctl)); } /* * Change the PTEs for the specified kernel mappings such that they * will use the mini data cache instead of the main data cache. */ void pmap_uarea(vaddr_t va) { vaddr_t next_bucket, eva; #if (ARM_NMMUS > 1) if (xscale_use_minidata == 0) return; #endif eva = va + USPACE; while (va < eva) { next_bucket = L2_NEXT_BUCKET_VA(va); if (next_bucket > eva) next_bucket = eva; struct l2_bucket *l2b = pmap_get_l2_bucket(pmap_kernel(), va); KDASSERT(l2b != NULL); pt_entry_t * const sptep = &l2b->l2b_kva[l2pte_index(va)]; pt_entry_t *ptep = sptep; while (va < next_bucket) { const pt_entry_t opte = *ptep; if (!l2pte_minidata_p(opte)) { cpu_dcache_wbinv_range(va, PAGE_SIZE); cpu_tlb_flushD_SE(va); l2pte_set(ptep, opte & ~L2_B, opte); } ptep += PAGE_SIZE / L2_S_SIZE; va += PAGE_SIZE; } PTE_SYNC_RANGE(sptep, (u_int)(ptep - sptep)); } cpu_cpwait(); } #endif /* ARM_MMU_XSCALE == 1 */ #if defined(CPU_ARM11MPCORE) void pmap_pte_init_arm11mpcore(void) { /* cache mode is controlled by 5 bits (B, C, TEX) */ pte_l1_s_cache_mask = L1_S_CACHE_MASK_armv6; pte_l2_l_cache_mask = L2_L_CACHE_MASK_armv6; #if defined(ARM11MPCORE_COMPAT_MMU) || defined(ARMV6_EXTENDED_SMALL_PAGE) /* use extended small page (without APn, with TEX) */ pte_l2_s_cache_mask = L2_XS_CACHE_MASK_armv6; #else pte_l2_s_cache_mask = L2_S_CACHE_MASK_armv6c; #endif /* write-back, write-allocate */ pte_l1_s_cache_mode = L1_S_C | L1_S_B | L1_S_V6_TEX(0x01); pte_l2_l_cache_mode = L2_C | L2_B | L2_V6_L_TEX(0x01); #if defined(ARM11MPCORE_COMPAT_MMU) || defined(ARMV6_EXTENDED_SMALL_PAGE) pte_l2_s_cache_mode = L2_C | L2_B | L2_V6_XS_TEX(0x01); #else /* no TEX. read-allocate */ pte_l2_s_cache_mode = L2_C | L2_B; #endif /* * write-back, write-allocate for page tables. */ pte_l1_s_cache_mode_pt = L1_S_C | L1_S_B | L1_S_V6_TEX(0x01); pte_l2_l_cache_mode_pt = L2_C | L2_B | L2_V6_L_TEX(0x01); #if defined(ARM11MPCORE_COMPAT_MMU) || defined(ARMV6_EXTENDED_SMALL_PAGE) pte_l2_s_cache_mode_pt = L2_C | L2_B | L2_V6_XS_TEX(0x01); #else pte_l2_s_cache_mode_pt = L2_C | L2_B; #endif pte_l1_s_prot_u = L1_S_PROT_U_armv6; pte_l1_s_prot_w = L1_S_PROT_W_armv6; pte_l1_s_prot_ro = L1_S_PROT_RO_armv6; pte_l1_s_prot_mask = L1_S_PROT_MASK_armv6; #if defined(ARM11MPCORE_COMPAT_MMU) || defined(ARMV6_EXTENDED_SMALL_PAGE) pte_l2_s_prot_u = L2_S_PROT_U_armv6n; pte_l2_s_prot_w = L2_S_PROT_W_armv6n; pte_l2_s_prot_ro = L2_S_PROT_RO_armv6n; pte_l2_s_prot_mask = L2_S_PROT_MASK_armv6n; #else /* with AP[0..3] */ pte_l2_s_prot_u = L2_S_PROT_U_generic; pte_l2_s_prot_w = L2_S_PROT_W_generic; pte_l2_s_prot_ro = L2_S_PROT_RO_generic; pte_l2_s_prot_mask = L2_S_PROT_MASK_generic; #endif #ifdef ARM11MPCORE_COMPAT_MMU /* with AP[0..3] */ pte_l2_l_prot_u = L2_L_PROT_U_generic; pte_l2_l_prot_w = L2_L_PROT_W_generic; pte_l2_l_prot_ro = L2_L_PROT_RO_generic; pte_l2_l_prot_mask = L2_L_PROT_MASK_generic; pte_l1_ss_proto = L1_SS_PROTO_armv6; pte_l1_s_proto = L1_S_PROTO_armv6; pte_l1_c_proto = L1_C_PROTO_armv6; pte_l2_s_proto = L2_S_PROTO_armv6c; #else pte_l2_l_prot_u = L2_L_PROT_U_armv6n; pte_l2_l_prot_w = L2_L_PROT_W_armv6n; pte_l2_l_prot_ro = L2_L_PROT_RO_armv6n; pte_l2_l_prot_mask = L2_L_PROT_MASK_armv6n; pte_l1_ss_proto = L1_SS_PROTO_armv6; pte_l1_s_proto = L1_S_PROTO_armv6; pte_l1_c_proto = L1_C_PROTO_armv6; pte_l2_s_proto = L2_S_PROTO_armv6n; #endif pmap_copy_page_func = pmap_copy_page_generic; pmap_zero_page_func = pmap_zero_page_generic; pmap_needs_pte_sync = 1; } #endif /* CPU_ARM11MPCORE */ #if ARM_MMU_V7 == 1 void pmap_pte_init_armv7(void) { /* * The ARMv7-A MMU is mostly compatible with generic. If the * AP field is zero, that now means "no access" rather than * read-only. The prototypes are a little different because of * the XN bit. */ pmap_pte_init_generic(); pmap_needs_pte_sync = 1; pte_l1_s_cache_mask = L1_S_CACHE_MASK_armv7; pte_l2_l_cache_mask = L2_L_CACHE_MASK_armv7; pte_l2_s_cache_mask = L2_S_CACHE_MASK_armv7; /* * If the core support coherent walk then updates to translation tables * do not require a clean to the point of unification to ensure * visibility by subsequent translation table walks. That means we can * map everything shareable and cached and the right thing will happen. */ if (__SHIFTOUT(armreg_mmfr3_read(), __BITS(23,20))) { pmap_needs_pte_sync = 0; /* * write-back, no write-allocate, shareable for normal pages. */ pte_l1_s_cache_mode |= L1_S_V6_S; pte_l2_l_cache_mode |= L2_XS_S; pte_l2_s_cache_mode |= L2_XS_S; /* * write-back, no write-allocate, shareable for page tables. */ pte_l1_s_cache_mode_pt = pte_l1_s_cache_mode; pte_l2_l_cache_mode_pt = pte_l2_l_cache_mode; pte_l2_s_cache_mode_pt = pte_l2_s_cache_mode; } /* * Check the Memory Model Features to see if this CPU supports * the TLBIASID coproc op. */ if (__SHIFTOUT(armreg_mmfr2_read(), __BITS(16,19)) >= 2) { arm_has_tlbiasid_p = true; } pte_l1_s_prot_u = L1_S_PROT_U_armv7; pte_l1_s_prot_w = L1_S_PROT_W_armv7; pte_l1_s_prot_ro = L1_S_PROT_RO_armv7; pte_l1_s_prot_mask = L1_S_PROT_MASK_armv7; pte_l2_s_prot_u = L2_S_PROT_U_armv7; pte_l2_s_prot_w = L2_S_PROT_W_armv7; pte_l2_s_prot_ro = L2_S_PROT_RO_armv7; pte_l2_s_prot_mask = L2_S_PROT_MASK_armv7; pte_l2_l_prot_u = L2_L_PROT_U_armv7; pte_l2_l_prot_w = L2_L_PROT_W_armv7; pte_l2_l_prot_ro = L2_L_PROT_RO_armv7; pte_l2_l_prot_mask = L2_L_PROT_MASK_armv7; pte_l1_ss_proto = L1_SS_PROTO_armv7; pte_l1_s_proto = L1_S_PROTO_armv7; pte_l1_c_proto = L1_C_PROTO_armv7; pte_l2_s_proto = L2_S_PROTO_armv7; } #endif /* ARM_MMU_V7 */ /* * return the PA of the current L1 table, for use when handling a crash dump */ uint32_t pmap_kernel_L1_addr(void) { #ifdef ARM_MMU_EXTENDED return pmap_kernel()->pm_l1_pa; #else return pmap_kernel()->pm_l1->l1_physaddr; #endif } #if defined(DDB) /* * A couple of ddb-callable functions for dumping pmaps */ void pmap_dump_all(void); void pmap_dump(pmap_t); void pmap_dump_all(void) { pmap_t pm; LIST_FOREACH(pm, &pmap_pmaps, pm_list) { if (pm == pmap_kernel()) continue; pmap_dump(pm); printf("\n"); } } static pt_entry_t ncptes[64]; static void pmap_dump_ncpg(pmap_t); void pmap_dump(pmap_t pm) { struct l2_dtable *l2; struct l2_bucket *l2b; pt_entry_t *ptep, pte; vaddr_t l2_va, l2b_va, va; int i, j, k, occ, rows = 0; if (pm == pmap_kernel()) printf("pmap_kernel (%p): ", pm); else printf("user pmap (%p): ", pm); #ifdef ARM_MMU_EXTENDED printf("l1 at %p\n", pmap_l1_kva(pm)); #else printf("domain %d, l1 at %p\n", pmap_domain(pm), pmap_l1_kva(pm)); #endif l2_va = 0; for (i = 0; i < L2_SIZE; i++, l2_va += 0x01000000) { l2 = pm->pm_l2[i]; if (l2 == NULL || l2->l2_occupancy == 0) continue; l2b_va = l2_va; for (j = 0; j < L2_BUCKET_SIZE; j++, l2b_va += 0x00100000) { l2b = &l2->l2_bucket[j]; if (l2b->l2b_occupancy == 0 || l2b->l2b_kva == NULL) continue; ptep = l2b->l2b_kva; for (k = 0; k < 256 && ptep[k] == 0; k++) ; k &= ~63; occ = l2b->l2b_occupancy; va = l2b_va + (k * 4096); for (; k < 256; k++, va += 0x1000) { char ch = ' '; if ((k % 64) == 0) { if ((rows % 8) == 0) { printf( " |0000 |8000 |10000 |18000 |20000 |28000 |30000 |38000\n"); } printf("%08lx: ", va); } ncptes[k & 63] = 0; pte = ptep[k]; if (pte == 0) { ch = '.'; } else { occ--; switch (pte & 0x0c) { case 0x00: ch = 'D'; /* No cache No buff */ break; case 0x04: ch = 'B'; /* No cache buff */ break; case 0x08: if (pte & 0x40) ch = 'm'; else ch = 'C'; /* Cache No buff */ break; case 0x0c: ch = 'F'; /* Cache Buff */ break; } if ((pte & L2_S_PROT_U) == L2_S_PROT_U) ch += 0x20; if ((pte & 0xc) == 0) ncptes[k & 63] = pte; } if ((k % 64) == 63) { rows++; printf("%c\n", ch); pmap_dump_ncpg(pm); if (occ == 0) break; } else printf("%c", ch); } } } } static void pmap_dump_ncpg(pmap_t pm) { struct vm_page *pg; struct vm_page_md *md; struct pv_entry *pv; int i; for (i = 0; i < 63; i++) { if (ncptes[i] == 0) continue; pg = PHYS_TO_VM_PAGE(l2pte_pa(ncptes[i])); if (pg == NULL) continue; md = VM_PAGE_TO_MD(pg); printf(" pa 0x%08lx: krw %d kro %d urw %d uro %d\n", VM_PAGE_TO_PHYS(pg), md->krw_mappings, md->kro_mappings, md->urw_mappings, md->uro_mappings); SLIST_FOREACH(pv, &md->pvh_list, pv_link) { printf(" %c va 0x%08lx, flags 0x%x\n", (pm == pv->pv_pmap) ? '*' : ' ', pv->pv_va, pv->pv_flags); } } } #endif #ifdef PMAP_STEAL_MEMORY void pmap_boot_pageadd(pv_addr_t *newpv) { pv_addr_t *pv, *npv; if ((pv = SLIST_FIRST(&pmap_boot_freeq)) != NULL) { if (newpv->pv_pa < pv->pv_va) { KASSERT(newpv->pv_pa + newpv->pv_size <= pv->pv_pa); if (newpv->pv_pa + newpv->pv_size == pv->pv_pa) { newpv->pv_size += pv->pv_size; SLIST_REMOVE_HEAD(&pmap_boot_freeq, pv_list); } pv = NULL; } else { for (; (npv = SLIST_NEXT(pv, pv_list)) != NULL; pv = npv) { KASSERT(pv->pv_pa + pv->pv_size < npv->pv_pa); KASSERT(pv->pv_pa < newpv->pv_pa); if (newpv->pv_pa > npv->pv_pa) continue; if (pv->pv_pa + pv->pv_size == newpv->pv_pa) { pv->pv_size += newpv->pv_size; return; } if (newpv->pv_pa + newpv->pv_size < npv->pv_pa) break; newpv->pv_size += npv->pv_size; SLIST_INSERT_AFTER(pv, newpv, pv_list); SLIST_REMOVE_AFTER(newpv, pv_list); return; } } } if (pv) { SLIST_INSERT_AFTER(pv, newpv, pv_list); } else { SLIST_INSERT_HEAD(&pmap_boot_freeq, newpv, pv_list); } } void pmap_boot_pagealloc(psize_t amount, psize_t mask, psize_t match, pv_addr_t *rpv) { pv_addr_t *pv, **pvp; struct vm_physseg *ps; size_t i; KASSERT(amount & PGOFSET); KASSERT((mask & PGOFSET) == 0); KASSERT((match & PGOFSET) == 0); KASSERT(amount != 0); for (pvp = &SLIST_FIRST(&pmap_boot_freeq); (pv = *pvp) != NULL; pvp = &SLIST_NEXT(pv, pv_list)) { pv_addr_t *newpv; psize_t off; /* * If this entry is too small to satify the request... */ KASSERT(pv->pv_size > 0); if (pv->pv_size < amount) continue; for (off = 0; off <= mask; off += PAGE_SIZE) { if (((pv->pv_pa + off) & mask) == match && off + amount <= pv->pv_size) break; } if (off > mask) continue; rpv->pv_va = pv->pv_va + off; rpv->pv_pa = pv->pv_pa + off; rpv->pv_size = amount; pv->pv_size -= amount; if (pv->pv_size == 0) { KASSERT(off == 0); KASSERT((vaddr_t) pv == rpv->pv_va); *pvp = SLIST_NEXT(pv, pv_list); } else if (off == 0) { KASSERT((vaddr_t) pv == rpv->pv_va); newpv = (pv_addr_t *) (rpv->pv_va + amount); *newpv = *pv; newpv->pv_pa += amount; newpv->pv_va += amount; *pvp = newpv; } else if (off < pv->pv_size) { newpv = (pv_addr_t *) (rpv->pv_va + amount); *newpv = *pv; newpv->pv_size -= off; newpv->pv_pa += off + amount; newpv->pv_va += off + amount; SLIST_NEXT(pv, pv_list) = newpv; pv->pv_size = off; } else { KASSERT((vaddr_t) pv != rpv->pv_va); } memset((void *)rpv->pv_va, 0, amount); return; } if (vm_nphysseg == 0) panic("pmap_boot_pagealloc: couldn't allocate memory"); for (pvp = &SLIST_FIRST(&pmap_boot_freeq); (pv = *pvp) != NULL; pvp = &SLIST_NEXT(pv, pv_list)) { if (SLIST_NEXT(pv, pv_list) == NULL) break; } KASSERT(mask == 0); for (i = 0; i < vm_nphysseg; i++) { ps = VM_PHYSMEM_PTR(i); if (ps->avail_start == atop(pv->pv_pa + pv->pv_size) && pv->pv_va + pv->pv_size <= ptoa(ps->avail_end)) { rpv->pv_va = pv->pv_va; rpv->pv_pa = pv->pv_pa; rpv->pv_size = amount; *pvp = NULL; pmap_map_chunk(kernel_l1pt.pv_va, ptoa(ps->avail_start) + (pv->pv_va - pv->pv_pa), ptoa(ps->avail_start), amount - pv->pv_size, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); ps->avail_start += atop(amount - pv->pv_size); /* * If we consumed the entire physseg, remove it. */ if (ps->avail_start == ps->avail_end) { for (--vm_nphysseg; i < vm_nphysseg; i++) VM_PHYSMEM_PTR_SWAP(i, i + 1); } memset((void *)rpv->pv_va, 0, rpv->pv_size); return; } } panic("pmap_boot_pagealloc: couldn't allocate memory"); } vaddr_t pmap_steal_memory(vsize_t size, vaddr_t *vstartp, vaddr_t *vendp) { pv_addr_t pv; pmap_boot_pagealloc(size, 0, 0, &pv); return pv.pv_va; } #endif /* PMAP_STEAL_MEMORY */ SYSCTL_SETUP(sysctl_machdep_pmap_setup, "sysctl machdep.kmpages setup") { sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "machdep", NULL, NULL, 0, NULL, 0, CTL_MACHDEP, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_INT, "kmpages", SYSCTL_DESCR("count of pages allocated to kernel memory allocators"), NULL, 0, &pmap_kmpages, 0, CTL_MACHDEP, CTL_CREATE, CTL_EOL); } #ifdef PMAP_NEED_ALLOC_POOLPAGE struct vm_page * arm_pmap_alloc_poolpage(int flags) { /* * On some systems, only some pages may be "coherent" for dma and we * want to prefer those for pool pages (think mbufs) but fallback to * any page if none is available. */ if (arm_poolpage_vmfreelist != VM_FREELIST_DEFAULT) { return uvm_pagealloc_strat(NULL, 0, NULL, flags, UVM_PGA_STRAT_FALLBACK, arm_poolpage_vmfreelist); } return uvm_pagealloc(NULL, 0, NULL, flags); } #endif #if defined(ARM_MMU_EXTENDED) && defined(MULTIPROCESSOR) void pmap_md_tlb_info_attach(struct pmap_tlb_info *ti, struct cpu_info *ci) { /* nothing */ } int pic_ipi_shootdown(void *arg) { #if PMAP_NEED_TLB_SHOOTDOWN pmap_tlb_shootdown_process() #endif return 1; } #endif /* ARM_MMU_EXTENDED && MULTIPROCESSOR */