[BACK]Return to uvm_glue.c CVS log [TXT][DIR] Up to [cvs.NetBSD.org] / src / sys / uvm

Annotation of src/sys/uvm/uvm_glue.c, Revision 1.150

1.150   ! rmind       1: /*     $NetBSD$        */
1.1       mrg         2:
1.48      chs         3: /*
1.1       mrg         4:  * Copyright (c) 1997 Charles D. Cranor and Washington University.
1.48      chs         5:  * Copyright (c) 1991, 1993, The Regents of the University of California.
1.1       mrg         6:  *
                      7:  * All rights reserved.
                      8:  *
                      9:  * This code is derived from software contributed to Berkeley by
                     10:  * The Mach Operating System project at Carnegie-Mellon University.
                     11:  *
                     12:  * Redistribution and use in source and binary forms, with or without
                     13:  * modification, are permitted provided that the following conditions
                     14:  * are met:
                     15:  * 1. Redistributions of source code must retain the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer.
                     17:  * 2. Redistributions in binary form must reproduce the above copyright
                     18:  *    notice, this list of conditions and the following disclaimer in the
                     19:  *    documentation and/or other materials provided with the distribution.
1.147     chuck      20:  * 3. Neither the name of the University nor the names of its contributors
1.1       mrg        21:  *    may be used to endorse or promote products derived from this software
                     22:  *    without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     34:  * SUCH DAMAGE.
                     35:  *
                     36:  *     @(#)vm_glue.c   8.6 (Berkeley) 1/5/94
1.4       mrg        37:  * from: Id: uvm_glue.c,v 1.1.2.8 1998/02/07 01:16:54 chs Exp
1.1       mrg        38:  *
                     39:  *
                     40:  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
                     41:  * All rights reserved.
1.48      chs        42:  *
1.1       mrg        43:  * Permission to use, copy, modify and distribute this software and
                     44:  * its documentation is hereby granted, provided that both the copyright
                     45:  * notice and this permission notice appear in all copies of the
                     46:  * software, derivative works or modified versions, and any portions
                     47:  * thereof, and that both notices appear in supporting documentation.
1.48      chs        48:  *
                     49:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     50:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
1.1       mrg        51:  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
1.48      chs        52:  *
1.1       mrg        53:  * Carnegie Mellon requests users of this software to return to
                     54:  *
                     55:  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
                     56:  *  School of Computer Science
                     57:  *  Carnegie Mellon University
                     58:  *  Pittsburgh PA 15213-3890
                     59:  *
                     60:  * any improvements or extensions that they make and grant Carnegie the
                     61:  * rights to redistribute these changes.
                     62:  */
1.55      lukem      63:
                     64: #include <sys/cdefs.h>
1.150   ! rmind      65: __KERNEL_RCSID(0, "$NetBSD$");
1.1       mrg        66:
1.49      lukem      67: #include "opt_kgdb.h"
1.59      yamt       68: #include "opt_kstack.h"
1.5       mrg        69: #include "opt_uvmhist.h"
                     70:
1.1       mrg        71: /*
                     72:  * uvm_glue.c: glue functions
                     73:  */
                     74:
                     75: #include <sys/param.h>
1.145     rmind      76: #include <sys/kernel.h>
                     77:
1.1       mrg        78: #include <sys/systm.h>
                     79: #include <sys/proc.h>
                     80: #include <sys/resourcevar.h>
                     81: #include <sys/buf.h>
1.106     yamt       82: #include <sys/syncobj.h>
1.111     ad         83: #include <sys/cpu.h>
1.114     ad         84: #include <sys/atomic.h>
1.146     rmind      85: #include <sys/lwp.h>
1.1       mrg        86:
                     87: #include <uvm/uvm.h>
                     88:
                     89: /*
1.150   ! rmind      90:  * uvm_kernacc: test if kernel can access a memory region.
1.1       mrg        91:  *
1.150   ! rmind      92:  * => Currently used only by /dev/kmem driver (dev/mm.c).
1.1       mrg        93:  */
1.102     thorpej    94: bool
1.150   ! rmind      95: uvm_kernacc(void *addr, size_t len, vm_prot_t prot)
1.6       mrg        96: {
1.150   ! rmind      97:        vaddr_t saddr = trunc_page((vaddr_t)addr);
        !            98:        vaddr_t eaddr = round_page(saddr + len);
1.102     thorpej    99:        bool rv;
1.6       mrg       100:
                    101:        vm_map_lock_read(kernel_map);
                    102:        rv = uvm_map_checkprot(kernel_map, saddr, eaddr, prot);
                    103:        vm_map_unlock_read(kernel_map);
                    104:
1.150   ! rmind     105:        return rv;
1.1       mrg       106: }
                    107:
                    108: #ifdef KGDB
                    109: /*
                    110:  * Change protections on kernel pages from addr to addr+len
                    111:  * (presumably so debugger can plant a breakpoint).
                    112:  *
                    113:  * We force the protection change at the pmap level.  If we were
                    114:  * to use vm_map_protect a change to allow writing would be lazily-
                    115:  * applied meaning we would still take a protection fault, something
                    116:  * we really don't want to do.  It would also fragment the kernel
                    117:  * map unnecessarily.  We cannot use pmap_protect since it also won't
                    118:  * enforce a write-enable request.  Using pmap_enter is the only way
                    119:  * we can ensure the change takes place properly.
                    120:  */
1.6       mrg       121: void
1.104     christos  122: uvm_chgkprot(void *addr, size_t len, int rw)
1.6       mrg       123: {
                    124:        vm_prot_t prot;
1.13      eeh       125:        paddr_t pa;
                    126:        vaddr_t sva, eva;
1.6       mrg       127:
                    128:        prot = rw == B_READ ? VM_PROT_READ : VM_PROT_READ|VM_PROT_WRITE;
1.31      kleink    129:        eva = round_page((vaddr_t)addr + len);
                    130:        for (sva = trunc_page((vaddr_t)addr); sva < eva; sva += PAGE_SIZE) {
1.6       mrg       131:                /*
                    132:                 * Extract physical address for the page.
                    133:                 */
1.103     thorpej   134:                if (pmap_extract(pmap_kernel(), sva, &pa) == false)
1.123     christos  135:                        panic("%s: invalid page", __func__);
1.30      thorpej   136:                pmap_enter(pmap_kernel(), sva, pa, prot, PMAP_WIRED);
1.6       mrg       137:        }
1.51      chris     138:        pmap_update(pmap_kernel());
1.1       mrg       139: }
                    140: #endif
                    141:
                    142: /*
1.52      chs       143:  * uvm_vslock: wire user memory for I/O
1.1       mrg       144:  *
                    145:  * - called from physio and sys___sysctl
                    146:  * - XXXCDC: consider nuking this (or making it a macro?)
                    147:  */
                    148:
1.26      thorpej   149: int
1.97      chs       150: uvm_vslock(struct vmspace *vs, void *addr, size_t len, vm_prot_t access_type)
1.1       mrg       151: {
1.50      chs       152:        struct vm_map *map;
1.26      thorpej   153:        vaddr_t start, end;
1.45      chs       154:        int error;
1.26      thorpej   155:
1.97      chs       156:        map = &vs->vm_map;
1.31      kleink    157:        start = trunc_page((vaddr_t)addr);
                    158:        end = round_page((vaddr_t)addr + len);
1.93      drochner  159:        error = uvm_fault_wire(map, start, end, access_type, 0);
1.45      chs       160:        return error;
1.1       mrg       161: }
                    162:
                    163: /*
1.52      chs       164:  * uvm_vsunlock: unwire user memory wired by uvm_vslock()
1.1       mrg       165:  *
                    166:  * - called from physio and sys___sysctl
                    167:  * - XXXCDC: consider nuking this (or making it a macro?)
                    168:  */
                    169:
1.6       mrg       170: void
1.97      chs       171: uvm_vsunlock(struct vmspace *vs, void *addr, size_t len)
1.1       mrg       172: {
1.97      chs       173:        uvm_fault_unwire(&vs->vm_map, trunc_page((vaddr_t)addr),
1.43      chs       174:                round_page((vaddr_t)addr + len));
1.1       mrg       175: }
                    176:
                    177: /*
1.62      thorpej   178:  * uvm_proc_fork: fork a virtual address space
1.1       mrg       179:  *
                    180:  * - the address space is copied as per parent map's inherit values
1.62      thorpej   181:  */
                    182: void
1.102     thorpej   183: uvm_proc_fork(struct proc *p1, struct proc *p2, bool shared)
1.62      thorpej   184: {
                    185:
1.103     thorpej   186:        if (shared == true) {
1.62      thorpej   187:                p2->p_vmspace = NULL;
                    188:                uvmspace_share(p1, p2);
                    189:        } else {
                    190:                p2->p_vmspace = uvmspace_fork(p1->p_vmspace);
                    191:        }
                    192:
                    193:        cpu_proc_fork(p1, p2);
                    194: }
                    195:
                    196: /*
                    197:  * uvm_lwp_fork: fork a thread
                    198:  *
1.146     rmind     199:  * - a new PCB structure is allocated for the child process,
                    200:  *     and filled in by MD layer
1.20      thorpej   201:  * - if specified, the child gets a new user stack described by
                    202:  *     stack and stacksize
1.1       mrg       203:  * - NOTE: the kernel stack may be at a different location in the child
                    204:  *     process, and thus addresses of automatic variables may be invalid
1.62      thorpej   205:  *     after cpu_lwp_fork returns in the child process.  We do nothing here
                    206:  *     after cpu_lwp_fork returns.
1.1       mrg       207:  */
1.6       mrg       208: void
1.89      thorpej   209: uvm_lwp_fork(struct lwp *l1, struct lwp *l2, void *stack, size_t stacksize,
                    210:     void (*func)(void *), void *arg)
1.6       mrg       211: {
                    212:
1.137     rmind     213:        /* Fill stack with magic number. */
1.63      yamt      214:        kstack_setup_magic(l2);
1.6       mrg       215:
                    216:        /*
1.62      thorpej   217:         * cpu_lwp_fork() copy and update the pcb, and make the child ready
                    218:         * to run.  If this is a normal user fork, the child will exit
1.34      thorpej   219:         * directly to user mode via child_return() on its first time
                    220:         * slice and will not return here.  If this is a kernel thread,
                    221:         * the specified entry point will be executed.
1.6       mrg       222:         */
1.62      thorpej   223:        cpu_lwp_fork(l1, l2, stack, stacksize, func, arg);
1.138     rmind     224:
                    225:        /* Inactive emap for new LWP. */
                    226:        l2->l_emap_gen = UVM_EMAP_INACTIVE;
1.14      thorpej   227: }
                    228:
1.60      chs       229: #ifndef USPACE_ALIGN
1.115     yamt      230: #define        USPACE_ALIGN    0
1.60      chs       231: #endif
                    232:
1.115     yamt      233: static pool_cache_t uvm_uarea_cache;
1.148     matt      234: #if defined(__HAVE_CPU_UAREA_ROUTINES)
                    235: static pool_cache_t uvm_uarea_system_cache;
                    236: #else
                    237: #define uvm_uarea_system_cache uvm_uarea_cache
                    238: #endif
1.115     yamt      239:
                    240: static void *
                    241: uarea_poolpage_alloc(struct pool *pp, int flags)
                    242: {
1.141     rmind     243: #if defined(PMAP_MAP_POOLPAGE)
1.139     matt      244:        if (USPACE == PAGE_SIZE && USPACE_ALIGN == 0) {
                    245:                struct vm_page *pg;
                    246:                vaddr_t va;
                    247:
                    248:                pg = uvm_pagealloc(NULL, 0, NULL,
                    249:                   ((flags & PR_WAITOK) == 0 ? UVM_KMF_NOWAIT : 0));
                    250:                if (pg == NULL)
                    251:                        return NULL;
                    252:                va = PMAP_MAP_POOLPAGE(VM_PAGE_TO_PHYS(pg));
                    253:                if (va == 0)
                    254:                        uvm_pagefree(pg);
                    255:                return (void *)va;
                    256:        }
                    257: #endif
1.148     matt      258: #if defined(__HAVE_CPU_UAREA_ROUTINES)
                    259:        void *va = cpu_uarea_alloc(false);
                    260:        if (va)
                    261:                return (void *)va;
                    262: #endif
1.115     yamt      263:        return (void *)uvm_km_alloc(kernel_map, pp->pr_alloc->pa_pagesz,
1.141     rmind     264:            USPACE_ALIGN, UVM_KMF_WIRED |
                    265:            ((flags & PR_WAITOK) ? UVM_KMF_WAITVA :
1.115     yamt      266:            (UVM_KMF_NOWAIT | UVM_KMF_TRYLOCK)));
                    267: }
1.109     ad        268:
1.115     yamt      269: static void
                    270: uarea_poolpage_free(struct pool *pp, void *addr)
                    271: {
1.141     rmind     272: #if defined(PMAP_MAP_POOLPAGE)
1.139     matt      273:        if (USPACE == PAGE_SIZE && USPACE_ALIGN == 0) {
                    274:                paddr_t pa;
                    275:
                    276:                pa = PMAP_UNMAP_POOLPAGE((vaddr_t) addr);
                    277:                KASSERT(pa != 0);
                    278:                uvm_pagefree(PHYS_TO_VM_PAGE(pa));
                    279:                return;
                    280:        }
                    281: #endif
1.148     matt      282: #if defined(__HAVE_CPU_UAREA_ROUTINES)
                    283:        if (cpu_uarea_free(addr))
                    284:                return;
                    285: #endif
1.115     yamt      286:        uvm_km_free(kernel_map, (vaddr_t)addr, pp->pr_alloc->pa_pagesz,
1.141     rmind     287:            UVM_KMF_WIRED);
1.115     yamt      288: }
                    289:
                    290: static struct pool_allocator uvm_uarea_allocator = {
                    291:        .pa_alloc = uarea_poolpage_alloc,
                    292:        .pa_free = uarea_poolpage_free,
                    293:        .pa_pagesz = USPACE,
                    294: };
                    295:
1.148     matt      296: #if defined(__HAVE_CPU_UAREA_ROUTINES)
                    297: static void *
                    298: uarea_system_poolpage_alloc(struct pool *pp, int flags)
                    299: {
                    300:        void * const va = cpu_uarea_alloc(true);
                    301:        KASSERT(va != NULL);
                    302:        return va;
                    303: }
                    304:
                    305: static void
                    306: uarea_system_poolpage_free(struct pool *pp, void *addr)
                    307: {
                    308:        if (!cpu_uarea_free(addr))
                    309:                panic("%s: failed to free uarea %p", __func__, addr);
                    310: }
                    311:
                    312: static struct pool_allocator uvm_uarea_system_allocator = {
                    313:        .pa_alloc = uarea_system_poolpage_alloc,
                    314:        .pa_free = uarea_system_poolpage_free,
                    315:        .pa_pagesz = USPACE,
                    316: };
                    317: #endif /* __HAVE_CPU_UAREA_ROUTINES */
                    318:
1.115     yamt      319: void
                    320: uvm_uarea_init(void)
                    321: {
1.117     yamt      322:        int flags = PR_NOTOUCH;
1.115     yamt      323:
1.116     yamt      324:        /*
                    325:         * specify PR_NOALIGN unless the alignment provided by
                    326:         * the backend (USPACE_ALIGN) is sufficient to provide
                    327:         * pool page size (UPSACE) alignment.
                    328:         */
                    329:
1.117     yamt      330:        if ((USPACE_ALIGN == 0 && USPACE != PAGE_SIZE) ||
                    331:            (USPACE_ALIGN % USPACE) != 0) {
                    332:                flags |= PR_NOALIGN;
                    333:        }
                    334:
                    335:        uvm_uarea_cache = pool_cache_init(USPACE, USPACE_ALIGN, 0, flags,
1.141     rmind     336:            "uarea", &uvm_uarea_allocator, IPL_NONE, NULL, NULL, NULL);
1.149     drochner  337: #if defined(__HAVE_CPU_UAREA_ROUTINES)
                    338:        uvm_uarea_system_cache = pool_cache_init(USPACE, USPACE_ALIGN,
                    339:            0, flags, "uareasys", &uvm_uarea_system_allocator,
                    340:            IPL_NONE, NULL, NULL, NULL);
                    341: #endif
1.60      chs       342: }
                    343:
                    344: /*
1.115     yamt      345:  * uvm_uarea_alloc: allocate a u-area
1.75      jdolecek  346:  */
                    347:
1.141     rmind     348: vaddr_t
                    349: uvm_uarea_alloc(void)
1.75      jdolecek  350: {
1.109     ad        351:
1.141     rmind     352:        return (vaddr_t)pool_cache_get(uvm_uarea_cache, PR_WAITOK);
1.75      jdolecek  353: }
                    354:
1.148     matt      355: vaddr_t
                    356: uvm_uarea_system_alloc(void)
                    357: {
                    358:
                    359:        return (vaddr_t)pool_cache_get(uvm_uarea_system_cache, PR_WAITOK);
                    360: }
                    361:
1.75      jdolecek  362: /*
1.115     yamt      363:  * uvm_uarea_free: free a u-area
1.60      chs       364:  */
                    365:
                    366: void
1.141     rmind     367: uvm_uarea_free(vaddr_t uaddr)
1.60      chs       368: {
                    369:
1.115     yamt      370:        pool_cache_put(uvm_uarea_cache, (void *)uaddr);
1.60      chs       371: }
                    372:
1.148     matt      373: void
                    374: uvm_uarea_system_free(vaddr_t uaddr)
                    375: {
                    376:
                    377:        pool_cache_put(uvm_uarea_system_cache, (void *)uaddr);
                    378: }
                    379:
1.142     rmind     380: vaddr_t
                    381: uvm_lwp_getuarea(lwp_t *l)
                    382: {
                    383:
1.146     rmind     384:        return (vaddr_t)l->l_addr - UAREA_PCB_OFFSET;
1.142     rmind     385: }
                    386:
                    387: void
                    388: uvm_lwp_setuarea(lwp_t *l, vaddr_t addr)
                    389: {
                    390:
1.146     rmind     391:        l->l_addr = (void *)(addr + UAREA_PCB_OFFSET);
1.142     rmind     392: }
                    393:
1.60      chs       394: /*
1.118     yamt      395:  * uvm_proc_exit: exit a virtual address space
1.80      pk        396:  *
                    397:  * - borrow proc0's address space because freeing the vmspace
                    398:  *   of the dead process may block.
                    399:  */
                    400:
                    401: void
1.89      thorpej   402: uvm_proc_exit(struct proc *p)
1.80      pk        403: {
                    404:        struct lwp *l = curlwp; /* XXX */
                    405:        struct vmspace *ovm;
                    406:
                    407:        KASSERT(p == l->l_proc);
                    408:        ovm = p->p_vmspace;
                    409:
                    410:        /*
                    411:         * borrow proc0's address space.
                    412:         */
1.129     ad        413:        KPREEMPT_DISABLE(l);
1.80      pk        414:        pmap_deactivate(l);
                    415:        p->p_vmspace = proc0.p_vmspace;
                    416:        pmap_activate(l);
1.129     ad        417:        KPREEMPT_ENABLE(l);
1.80      pk        418:
                    419:        uvmspace_free(ovm);
                    420: }
                    421:
                    422: void
                    423: uvm_lwp_exit(struct lwp *l)
                    424: {
1.143     rmind     425:        vaddr_t va = uvm_lwp_getuarea(l);
1.148     matt      426:        bool system = (l->l_flag & LW_SYSTEM) != 0;
1.80      pk        427:
1.148     matt      428:        if (system)
                    429:                uvm_uarea_system_free(va);
                    430:        else
                    431:                uvm_uarea_free(va);
1.143     rmind     432: #ifdef DIAGNOSTIC
                    433:        uvm_lwp_setuarea(l, (vaddr_t)NULL);
                    434: #endif
1.80      pk        435: }
                    436:
                    437: /*
1.1       mrg       438:  * uvm_init_limit: init per-process VM limits
                    439:  *
                    440:  * - called for process 0 and then inherited by all others.
                    441:  */
1.60      chs       442:
1.6       mrg       443: void
1.89      thorpej   444: uvm_init_limits(struct proc *p)
1.6       mrg       445: {
                    446:
                    447:        /*
                    448:         * Set up the initial limits on process VM.  Set the maximum
                    449:         * resident set size to be all of (reasonably) available memory.
                    450:         * This causes any single, large process to start random page
                    451:         * replacement once it fills memory.
                    452:         */
                    453:
                    454:        p->p_rlimit[RLIMIT_STACK].rlim_cur = DFLSSIZ;
1.79      pk        455:        p->p_rlimit[RLIMIT_STACK].rlim_max = maxsmap;
1.6       mrg       456:        p->p_rlimit[RLIMIT_DATA].rlim_cur = DFLDSIZ;
1.79      pk        457:        p->p_rlimit[RLIMIT_DATA].rlim_max = maxdmap;
1.136     mrg       458:        p->p_rlimit[RLIMIT_AS].rlim_cur = RLIM_INFINITY;
                    459:        p->p_rlimit[RLIMIT_AS].rlim_max = RLIM_INFINITY;
1.144     jym       460:        p->p_rlimit[RLIMIT_RSS].rlim_cur = MIN(
                    461:            VM_MAXUSER_ADDRESS, ctob((rlim_t)uvmexp.free));
1.1       mrg       462: }
                    463:
1.99      ad        464: /*
1.141     rmind     465:  * uvm_scheduler: process zero main loop.
1.1       mrg       466:  */
1.145     rmind     467:
                    468: extern struct loadavg averunnable;
                    469:
1.6       mrg       470: void
1.89      thorpej   471: uvm_scheduler(void)
1.1       mrg       472: {
1.141     rmind     473:        lwp_t *l = curlwp;
1.1       mrg       474:
1.99      ad        475:        lwp_lock(l);
1.113     ad        476:        l->l_priority = PRI_VM;
                    477:        l->l_class = SCHED_FIFO;
1.99      ad        478:        lwp_unlock(l);
                    479:
                    480:        for (;;) {
1.145     rmind     481:                sched_pstats();
                    482:                (void)kpause("uvm", false, hz, NULL);
1.114     ad        483:        }
1.107     ad        484: }

CVSweb <webmaster@jp.NetBSD.org>