Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files. =================================================================== RCS file: /ftp/cvs/cvsroot/src/sys/arch/i386/i386/locore.S,v rcsdiff: /ftp/cvs/cvsroot/src/sys/arch/i386/i386/locore.S,v: warning: Unknown phrases like `commitid ...;' are present. retrieving revision 1.61 retrieving revision 1.96 diff -u -p -r1.61 -r1.96 --- src/sys/arch/i386/i386/locore.S 2008/01/10 20:14:11 1.61 +++ src/sys/arch/i386/i386/locore.S 2012/02/24 08:06:07 1.96 @@ -1,10 +1,35 @@ -/* $NetBSD: locore.S,v 1.61 2008/01/10 20:14:11 ad Exp $ */ +/* $NetBSD: locore.S,v 1.96 2012/02/24 08:06:07 cherry Exp $ */ /* * Copyright-o-rama! */ /* + * Copyright (c) 2006 Manuel Bouyer. + * + * 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 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 + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +/* * Copyright (c) 2001 Wasabi Systems, Inc. * All rights reserved. * @@ -41,11 +66,11 @@ /*- - * Copyright (c) 1998, 2000, 2004, 2006, 2007 The NetBSD Foundation, Inc. + * Copyright (c) 1998, 2000, 2004, 2006, 2007, 2009 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation - * by Charles M. Hannum. + * by Charles M. Hannum, and by Andrew Doran. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -55,13 +80,6 @@ * 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 the NetBSD - * Foundation, Inc. and its contributors. - * 4. Neither the name of The NetBSD Foundation nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED @@ -111,12 +129,15 @@ */ #include -__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.61 2008/01/10 20:14:11 ad Exp $"); +__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.96 2012/02/24 08:06:07 cherry Exp $"); #include "opt_compat_oldboot.h" #include "opt_ddb.h" +#include "opt_modular.h" +#include "opt_multiboot.h" #include "opt_realmem.h" #include "opt_vm86.h" +#include "opt_xen.h" #include "npx.h" #include "assym.h" @@ -132,23 +153,55 @@ __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1 #include #include #include -#include #include #include +#ifndef XEN +#include +#endif /* XXX temporary kluge; these should not be here */ /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */ #include +#ifdef XEN +/* + * Xen guest identifier and loader selection + */ +.section __xen_guest + .ascii "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0" +#if defined(DOM0OPS) || !defined(XEN_COMPAT_030001) + .ascii ",VIRT_BASE=0xc0000000" /* KERNBASE */ + .ascii ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */ +#else + .ascii ",VIRT_BASE=0xc0100000" /* KERNTEXTOFF */ + .ascii ",ELF_PADDR_OFFSET=0xc0100000" /* KERNTEXTOFF */ +#endif + .ascii ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */ +#if !defined(XEN_COMPAT_030001) + .ascii ",HYPERCALL_PAGE=0x00000101" + /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */ +#endif +#ifdef PAE + .ascii ",PAE=yes[extended-cr3]" +#endif + .ascii ",LOADER=generic" +#if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(SYMTAB_SPACE) + .ascii ",BSD_SYMTAB=yes" +#endif + .byte 0 +#endif + /* * Initialization */ .data .globl _C_LABEL(cpu) + .globl _C_LABEL(cpuid_level) .globl _C_LABEL(esym) + .globl _C_LABEL(eblob) .globl _C_LABEL(atdevbase) - .globl _C_LABEL(proc0uarea),_C_LABEL(PDPpaddr) + .globl _C_LABEL(lwp0uarea),_C_LABEL(PDPpaddr) .globl _C_LABEL(gdt) .globl _C_LABEL(idt) .globl _C_LABEL(lapic_tpr) @@ -177,16 +230,25 @@ _C_LABEL(lapic_tpr): #endif _C_LABEL(cpu): .long 0 # are we 80486, Pentium, or.. +_C_LABEL(cpuid_level): .long 0 _C_LABEL(atdevbase): .long 0 # location of start of iomem in virtual -_C_LABEL(proc0uarea): .long 0 +_C_LABEL(lwp0uarea): .long 0 _C_LABEL(PDPpaddr): .long 0 # paddr of PDP, for libkvm _C_LABEL(tablesize): .long 0 .space 512 tmpstk: - - +#ifdef XEN + .align PAGE_SIZE, 0x0 # Align on page boundary +_C_LABEL(tmpgdt): + .space PAGE_SIZE # Xen expects a page +#endif /* XEN */ + .globl tmpgdt +#ifndef XEN #define _RELOC(x) ((x) - KERNBASE) +#else +#define _RELOC(x) ((x)) +#endif /* XEN */ #define RELOC(x) _RELOC(_C_LABEL(x)) .text @@ -194,6 +256,7 @@ tmpstk: .set _C_LABEL(kernel_text),KERNTEXTOFF .globl start +#ifndef XEN start: movw $0x1234,0x472 # warm boot #if defined(MULTIBOOT) @@ -246,7 +309,7 @@ _C_LABEL(Multiboot_Header): movw %ax,%fs movw %ax,%gs decl %eax - movl %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL + movl %eax,RELOC(cpuid_level) /* Find out our CPU type. */ @@ -406,7 +469,7 @@ trycyrix486: try586: /* Use the `cpuid' instruction. */ xorl %eax,%eax cpuid - movl %eax,RELOC(cpu_info_primary)+CPU_INFO_LEVEL + movl %eax,RELOC(cpuid_level) 2: /* @@ -424,33 +487,48 @@ try586: /* Use the `cpuid' instruction. movl $_RELOC(tmpstk),%esp # bootstrap stack end location /* - * Virtual address space of kernel: + * Virtual address space of kernel, without PAE. The page dir is 1 page long. + * + * text | data | bss | [syms] | [blobs] | page dir | proc0 kstack | L1 ptp + * 0 1 2 3 * - * text | data | bss | [syms] | page dir | proc0 kstack | L1 ptp - * 0 1 2 3 + * Virtual address space of kernel, with PAE. We need 4 pages for the page dir + * and 1 page for the L3. + * text | data | bss | [syms] | [blobs] | L3 | page dir | proc0 kstack | L1 ptp + * 0 1 5 6 7 */ - +#ifndef PAE #define PROC0_PDIR_OFF 0 -#define PROC0_STK_OFF (PROC0_PDIR_OFF + PAGE_SIZE) +#else +#define PROC0_L3_OFF 0 +#define PROC0_PDIR_OFF 1 * PAGE_SIZE +#endif + +#define PROC0_STK_OFF (PROC0_PDIR_OFF + PDP_SIZE * PAGE_SIZE) #define PROC0_PTP1_OFF (PROC0_STK_OFF + UPAGES * PAGE_SIZE) /* - * fillkpt + * fillkpt - Fill in a kernel page table * eax = pte (page frame | control | status) * ebx = page table address * ecx = number of pages to map + * + * For PAE, each entry is 8 bytes long: we must set the 4 upper bytes to 0. + * This is done by the first instruction of fillkpt. In the non-PAE case, this + * instruction just clears the page table entry. */ #define fillkpt \ -1: movl %eax,(%ebx) ; /* store phys addr */ \ - addl $4,%ebx ; /* next pte/pde */ \ - addl $PAGE_SIZE,%eax ; /* next phys page */ \ - loop 1b ; \ - +1: movl $0,(PDE_SIZE-4)(%ebx) ; /* clear bits */ \ + movl %eax,(%ebx) ; /* store phys addr */ \ + addl $PDE_SIZE,%ebx ; /* next pte/pde */ \ + addl $PAGE_SIZE,%eax ; /* next phys page */ \ + loop 1b ; /* Find end of kernel image. */ movl $RELOC(end),%edi -#if (NKSYMS || defined(DDB) || defined(LKM)) && !defined(SYMTAB_SPACE) + +#if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(SYMTAB_SPACE) /* Save the symbols (if loaded). */ movl RELOC(esym),%eax testl %eax,%eax @@ -460,8 +538,15 @@ try586: /* Use the `cpuid' instruction. 1: #endif + /* Skip over any modules/blobs. */ + movl RELOC(eblob),%eax + testl %eax,%eax + jz 1f + subl $KERNBASE,%eax + movl %eax,%edi +1: /* Compute sizes */ - movl %edi,%esi # edi = esym ? esym : end + movl %edi,%esi addl $PGOFSET,%esi # page align up andl $~PGOFSET,%esi @@ -472,9 +557,14 @@ try586: /* Use the `cpuid' instruction. incl %eax /* one more ptp for VAs stolen by bootstrap */ 1: movl %eax,RELOC(nkptp)+1*4 - /* tablesize = (1 + UPAGES + nkptp) << PGSHIFT; */ - addl $(1+UPAGES),%eax + /* tablesize = (PDP_SIZE + UPAGES + nkptp) << PGSHIFT; */ + addl $(PDP_SIZE+UPAGES),%eax +#ifdef PAE + incl %eax /* one more page for the L3 PD */ + shll $PGSHIFT+1,%eax /* PTP tables are twice larger with PAE */ +#else shll $PGSHIFT,%eax +#endif movl %eax,RELOC(tablesize) /* ensure that nkptp covers bootstrap tables */ @@ -512,7 +602,10 @@ try586: /* Use the `cpuid' instruction. */ movl $_RELOC(KERNTEXTOFF),%eax movl %eax,%ecx - shrl $(PGSHIFT-2),%ecx /* ((n >> PGSHIFT) << 2) for # pdes */ + shrl $(PGSHIFT-2),%ecx /* ((n >> PGSHIFT) << 2) for # pdes */ +#ifdef PAE + shll $1,%ecx /* pdes are twice larger with PAE */ +#endif addl %ecx,%ebx /* Map the kernel text read-only. */ @@ -539,43 +632,58 @@ try586: /* Use the `cpuid' instruction. * Construct a page table directory. */ /* Set up top level entries for identity mapping */ - leal (PROC0_PDIR_OFF)(%esi),%ebx + leal (PROC0_PDIR_OFF)(%esi),%ebx leal (PROC0_PTP1_OFF)(%esi),%eax orl $(PG_V|PG_KW), %eax movl RELOC(nkptp)+1*4,%ecx fillkpt /* Set up top level entries for actual kernel mapping */ - leal (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*4)(%esi),%ebx + leal (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*PDE_SIZE)(%esi),%ebx leal (PROC0_PTP1_OFF)(%esi),%eax orl $(PG_V|PG_KW), %eax movl RELOC(nkptp)+1*4,%ecx fillkpt /* Install a PDE recursively mapping page directory as a page table! */ - leal (PROC0_PDIR_OFF + PDIR_SLOT_PTE*4)(%esi),%ebx - leal (PROC0_PDIR_OFF)(%esi),%eax + leal (PROC0_PDIR_OFF + PDIR_SLOT_PTE*PDE_SIZE)(%esi),%ebx + leal (PROC0_PDIR_OFF)(%esi),%eax orl $(PG_V|PG_KW),%eax - movl %eax,(%ebx) - + movl $PDP_SIZE,%ecx + fillkpt + +#ifdef PAE + /* Fill in proc0 L3 page with entries pointing to the page dirs */ + leal (PROC0_L3_OFF)(%esi),%ebx + leal (PROC0_PDIR_OFF)(%esi),%eax + orl $(PG_V),%eax + movl $PDP_SIZE,%ecx + fillkpt + + /* Enable PAE mode */ + movl %cr4,%eax + orl $CR4_PAE,%eax + movl %eax,%cr4 +#endif /* Save phys. addr of PDP, for libkvm. */ - movl %esi,RELOC(PDPpaddr) + leal (PROC0_PDIR_OFF)(%esi),%eax + movl %eax,RELOC(PDPpaddr) - /* - * Startup checklist: - * 1. Load %cr3 with pointer to PDIR. - */ + /* + * Startup checklist: + * 1. Load %cr3 with pointer to PDIR (or L3 PD page for PAE). + */ movl %esi,%eax # phys address of ptd in proc 0 movl %eax,%cr3 # load ptd addr into mmu - + /* * 2. Enable paging and the rest of it. */ movl %cr0,%eax # get control word # enable paging & NPX emulation orl $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax - movl %eax,%cr0 # and let's page NOW! + movl %eax,%cr0 # and page NOW! pushl $begin # jump to high mem ret @@ -587,10 +695,11 @@ begin: * memory, remove it. */ movl _C_LABEL(nkptp)+1*4,%ecx - leal (PROC0_PDIR_OFF)(%esi),%ebx # old, phys address of PDIR - addl $(KERNBASE), %ebx # new, virtual address of PDIR -1: movl $0,(%ebx) - addl $4,%ebx + leal (PROC0_PDIR_OFF)(%esi),%ebx # old, phys address of PDIR + addl $(KERNBASE), %ebx # new, virtual address of PDIR +1: movl $0,(PDE_SIZE-4)(%ebx) # Upper bits (for PAE) + movl $0,(%ebx) + addl $PDE_SIZE,%ebx loop 1b /* Relocate atdevbase. */ @@ -601,7 +710,7 @@ begin: /* Set up bootstrap stack. */ leal (PROC0_STK_OFF+KERNBASE)(%esi),%eax - movl %eax,_C_LABEL(proc0uarea) + movl %eax,_C_LABEL(lwp0uarea) leal (KSTACK_SIZE-FRAMESIZE)(%eax),%esp movl %esi,(KSTACK_SIZE+PCB_CR3)(%eax) # pcb->pcb_cr3 xorl %ebp,%ebp # mark end of frames @@ -622,9 +731,13 @@ begin: movl _C_LABEL(tablesize),%eax addl %esi,%eax # skip past stack and page tables +#ifdef PAE + pushl $0 # init386() expects a 64 bits paddr_t with PAE +#endif pushl %eax call _C_LABEL(init386) # wire 386 chip for unix operation - addl $4+NGDT*8,%esp # pop temporary gdt + addl $PDE_SIZE,%esp # pop paddr_t + addl $NGDT*8,%esp # pop temporary gdt #ifdef SAFARI_FIFO_HACK movb $5,%al @@ -645,6 +758,105 @@ begin: #endif /* SAFARI_FIFO_HACK */ call _C_LABEL(main) +#else /* XEN */ +start: + /* First, reset the PSL. */ + pushl $PSL_MBO + popfl + + cld + movl %esp, %ebx # save start of available space + movl $_RELOC(tmpstk),%esp # bootstrap stack end location + + /* Clear BSS first so that there are no surprises... */ + xorl %eax,%eax + movl $RELOC(__bss_start),%edi + movl $RELOC(_end),%ecx + subl %edi,%ecx + rep stosb + + /* Copy the necessary stuff from start_info structure. */ + /* We need to copy shared_info early, so that sti/cli work */ + movl $RELOC(start_info_union),%edi + movl $128,%ecx + rep movsl + + /* Clear segment registers; always null in proc0. */ + xorl %eax,%eax + movw %ax,%fs + movw %ax,%gs + decl %eax + movl %eax,RELOC(cpuid_level) + + xorl %eax,%eax + cpuid + movl %eax,RELOC(cpuid_level) + + /* + * Use a temp page. We'll re- add it to uvm(9) once we're + * done using it. + */ + movl $RELOC(tmpgdt), %eax + pushl %eax # start of temporary gdt + call _C_LABEL(initgdt) + addl $4,%esp + + call xen_pmap_bootstrap + + /* + * First avail returned by xen_pmap_bootstrap in %eax + */ + movl %eax, %esi; + movl %esi, _C_LABEL(lwp0uarea) + + /* Set up bootstrap stack. */ + leal (KSTACK_SIZE-FRAMESIZE)(%eax),%esp + xorl %ebp,%ebp # mark end of frames + + addl $USPACE, %esi + subl $KERNBASE, %esi #init386 want a physical address + +#ifdef PAE + pushl $0 # init386() expects a 64 bits paddr_t with PAE +#endif + pushl %esi + call _C_LABEL(init386) # wire 386 chip for unix operation + addl $PDE_SIZE,%esp # pop paddr_t + call _C_LABEL(main) + +#if defined(XEN) && !defined(XEN_COMPAT_030001) +/* space for the hypercall call page */ +#define HYPERCALL_PAGE_OFFSET 0x1000 +.org HYPERCALL_PAGE_OFFSET +ENTRY(hypercall_page) +.skip 0x1000 +#endif /* defined(XEN) && !defined(XEN_COMPAT_030001) */ + +/* + * void lgdt_finish(void); + * Finish load a new GDT pointer (do any necessary cleanup). + * XXX It's somewhat questionable whether reloading all the segment registers + * is necessary, since the actual descriptor data is not changed except by + * process creation and exit, both of which clean up via task switches. OTOH, + * this only happens at run time when the GDT is resized. + */ +/* LINTSTUB: Func: void lgdt_finish(void) */ +NENTRY(lgdt_finish) + movl $GSEL(GDATA_SEL, SEL_KPL),%eax + movw %ax,%ds + movw %ax,%es + movw %ax,%gs + movw %ax,%ss + movl $GSEL(GCPU_SEL, SEL_KPL),%eax + movw %ax,%fs + /* Reload code selector by doing intersegment return. */ + popl %eax + pushl $GSEL(GCODE_SEL, SEL_KPL) + pushl %eax + lret +END(lgdt_finish) + +#endif /* XEN */ /* * void lwp_trampoline(void); @@ -656,17 +868,18 @@ begin: * NOTE: This function does not have a normal calling sequence! */ NENTRY(lwp_trampoline) - pushl %ebp + movl %ebp,%edi /* for .Lsyscall_checkast */ xorl %ebp,%ebp + pushl %edi pushl %eax call _C_LABEL(lwp_startup) addl $8,%esp pushl %ebx call *%esi addl $4,%esp - DO_DEFERRED_SWITCH - INTRFASTEXIT + jmp .Lsyscall_checkast /* NOTREACHED */ +END(lwp_trampoline) /* * sigcode() @@ -688,6 +901,7 @@ NENTRY(sigcode) int $0x80 # exit if sigreturn fails .globl _C_LABEL(esigcode) _C_LABEL(esigcode): +END(sigcode) /* * int setjmp(label_t *) @@ -705,6 +919,7 @@ ENTRY(setjmp) movl %edx,20(%eax) # save eip xorl %eax,%eax # return 0 ret +END(setjmp) /* * int longjmp(label_t *) @@ -722,9 +937,26 @@ ENTRY(longjmp) movl %edx,(%esp) # put in return frame movl $1,%eax # return 1 ret +END(longjmp) + +/* + * void dumpsys(void) + * + * Mimic cpu_switchto() for postmortem debugging. + */ +ENTRY(dumpsys) + pushl %ebx # set up fake switchframe + pushl %esi # and save context + pushl %edi + movl %esp,_C_LABEL(dumppcb)+PCB_ESP + movl %ebp,_C_LABEL(dumppcb)+PCB_EBP + call _C_LABEL(dodumpsys) # dump! + addl $(3*4), %esp # unwind switchframe + ret +END(dumpsys) /* - * struct lwp *cpu_switchto(struct lwp *oldlwp, struct newlwp, + * struct lwp *cpu_switchto(struct lwp *oldlwp, struct *newlwp, * bool returning) * * 1. if (oldlwp != NULL), save its context. @@ -739,6 +971,17 @@ ENTRY(cpu_switchto) pushl %esi pushl %edi +#if defined(DIAGNOSTIC) && !defined(XEN) + cmpl $IPL_SCHED,CPUVAR(ILEVEL) + jbe 0f + pushl CPUVAR(ILEVEL) + pushl $.Lstr + call _C_LABEL(panic) + addl $8,%esp +.Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0" +0: +#endif + movl 16(%esp),%esi # oldlwp movl 20(%esp),%edi # newlwp movl 24(%esp),%edx # returning @@ -746,12 +989,12 @@ ENTRY(cpu_switchto) jz 1f /* Save old context. */ - movl L_ADDR(%esi),%eax + movl L_PCB(%esi),%eax movl %esp,PCB_ESP(%eax) movl %ebp,PCB_EBP(%eax) /* Switch to newlwp's stack. */ -1: movl L_ADDR(%edi),%ebx +1: movl L_PCB(%edi),%ebx movl PCB_EBP(%ebx),%ebp movl PCB_ESP(%ebx),%esp @@ -766,6 +1009,11 @@ ENTRY(cpu_switchto) testl %edx,%edx jnz 4f +#ifdef XEN + pushl %edi + call _C_LABEL(i386_switch_context) + addl $4,%esp +#else /* XEN */ /* Switch ring0 esp */ movl PCB_ESP0(%ebx),%eax movl %eax,CPUVAR(ESP0) @@ -784,11 +1032,12 @@ ENTRY(cpu_switchto) movl PCB_GSD+4(%ebx), %edx movl %eax, (GUGS_SEL*8)(%ecx) movl %edx, (GUGS_SEL*8+4)(%ecx) +#endif /* XEN */ /* Switch I/O bitmap */ movl PCB_IOMAP(%ebx),%eax orl %eax,%eax - jnz,pn .Lcopy_iobitmap + jnz .Lcopy_iobitmap movl $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE) .Liobitmap_done: @@ -798,20 +1047,21 @@ ENTRY(cpu_switchto) jne 5f /* - * Restore cr0 (including FPU state). Raise the IPL to IPL_IPI. + * Restore cr0 (including FPU state). Raise the IPL to IPL_HIGH. * FPU IPIs can alter the LWP's saved cr0. Dropping the priority * is deferred until mi_switch(), when cpu_switchto() returns. */ -2: movl $IPL_IPI,CPUVAR(ILEVEL) - movl PCB_CR0(%ebx),%ecx +2: +#ifndef XEN + movl $IPL_HIGH,CPUVAR(ILEVEL) + movl PCB_CR0(%ebx),%ecx /* has CR0_TS clear */ movl %cr0,%edx /* * If our floating point registers are on a different CPU, * set CR0_TS so we'll trap rather than reuse bogus state. */ - movl PCB_FPCPU(%ebx),%eax - cmpl CPUVAR(SELF),%eax + cmpl CPUVAR(FPCURLWP),%edi je 3f orl $CR0_TS,%ecx @@ -819,6 +1069,7 @@ ENTRY(cpu_switchto) 3: cmpl %edx,%ecx je 4f movl %ecx,%cr0 +#endif /* XEN */ /* Return to the new LWP, returning 'oldlwp' in %eax. */ 4: movl %esi,%eax @@ -841,6 +1092,7 @@ ENTRY(cpu_switchto) .Lcopy_iobitmap: /* Copy I/O bitmap. */ + incl _C_LABEL(pmap_iobmp_evcnt)+EV_COUNT movl $(IOMAPSIZE/4),%ecx pushl %esi pushl %edi @@ -853,6 +1105,7 @@ ENTRY(cpu_switchto) popl %esi movl $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE) jmp .Liobitmap_done +END(cpu_switchto) /* * void savectx(struct pcb *pcb); @@ -864,6 +1117,7 @@ ENTRY(savectx) movl %esp,PCB_ESP(%edx) movl %ebp,PCB_EBP(%edx) ret +END(savectx) /* * osyscall() @@ -871,10 +1125,16 @@ ENTRY(savectx) * Old call gate entry for syscall */ IDTVEC(osyscall) +#ifndef XEN + /* XXX we are in trouble! interrupts be off here. */ + cli # must be first instruction +#endif pushfl # set eflags in trap frame popl 8(%esp) + orl $PSL_I,(%esp) # re-enable ints on return to user pushl $7 # size of instruction for restart jmp syscall1 +IDTVEC_END(osyscall) /* * syscall() @@ -886,67 +1146,122 @@ IDTVEC(syscall) syscall1: pushl $T_ASTFLT # trap # for doing ASTs INTRENTRY - + STI(%eax) #ifdef DIAGNOSTIC - cmpl $0, CPUVAR(WANT_PMAPLOAD) - jz 1f - pushl $6f - call _C_LABEL(printf) - addl $4, %esp -1: movl CPUVAR(ILEVEL),%ebx testl %ebx,%ebx jz 1f pushl $5f - call _C_LABEL(printf) + call _C_LABEL(panic) addl $4,%esp #ifdef DDB int $3 #endif 1: #endif /* DIAGNOSTIC */ - movl CPUVAR(CURLWP),%edx - movl %esp,L_MD_REGS(%edx) # save pointer to frame - movl L_PROC(%edx),%edx + addl $1,CPUVAR(NSYSCALL) # count it atomically + adcl $0,CPUVAR(NSYSCALL)+4 # count it atomically + movl CPUVAR(CURLWP),%edi + movl L_PROC(%edi),%edx + movl %esp,L_MD_REGS(%edi) # save pointer to frame pushl %esp call *P_MD_SYSCALL(%edx) # get pointer to syscall() function addl $4,%esp .Lsyscall_checkast: /* Check for ASTs on exit to user mode. */ - cli - CHECK_ASTPENDING(%eax) - je 1f - /* Always returning to user mode here. */ - CLEAR_ASTPENDING(%eax) - sti - /* Pushed T_ASTFLT into tf_trapno on entry. */ - pushl %esp - call _C_LABEL(trap) - addl $4,%esp - jmp .Lsyscall_checkast /* re-check ASTs */ -1: CHECK_DEFERRED_SWITCH + CLI(%eax) + movl L_MD_ASTPENDING(%edi), %eax + orl CPUVAR(WANT_PMAPLOAD), %eax jnz 9f +#ifdef XEN + STIC(%eax) + jz 14f + call _C_LABEL(stipending) + testl %eax,%eax + jz 14f + /* process pending interrupts */ + CLI(%eax) + movl CPUVAR(ILEVEL), %ebx + movl $.Lsyscall_resume, %esi # address to resume loop at +.Lsyscall_resume: + movl %ebx,%eax # get cpl + movl CPUVAR(IUNMASK)(,%eax,4),%eax + andl CPUVAR(IPENDING),%eax # any non-masked bits left? + jz 17f + bsrl %eax,%eax + btrl %eax,CPUVAR(IPENDING) + movl CPUVAR(ISOURCES)(,%eax,4),%eax + jmp *IS_RESUME(%eax) +17: movl %ebx, CPUVAR(ILEVEL) #restore cpl + jmp .Lsyscall_checkast +14: +#endif /* XEN */ #ifndef DIAGNOSTIC INTRFASTEXIT #else /* DIAGNOSTIC */ cmpl $IPL_NONE,CPUVAR(ILEVEL) jne 3f INTRFASTEXIT -3: sti +3: STI(%eax) pushl $4f - call _C_LABEL(printf) + call _C_LABEL(panic) addl $4,%esp pushl $IPL_NONE call _C_LABEL(spllower) addl $4,%esp jmp .Lsyscall_checkast -4: .asciz "WARNING: SPL NOT LOWERED ON SYSCALL EXIT\n" -5: .asciz "WARNING: SPL NOT ZERO ON SYSCALL ENTRY\n" -6: .asciz "WARNING: WANT PMAPLOAD ON SYSCALL ENTRY\n" +4: .asciz "SPL NOT LOWERED ON SYSCALL EXIT\n" +5: .asciz "SPL NOT ZERO ON SYSCALL ENTRY\n" #endif /* DIAGNOSTIC */ -9: sti +9: + cmpl $0, CPUVAR(WANT_PMAPLOAD) + jz 10f + STI(%eax) call _C_LABEL(pmap_load) jmp .Lsyscall_checkast /* re-check ASTs */ +10: + /* Always returning to user mode here. */ + movl $0, L_MD_ASTPENDING(%edi) + STI(%eax) + /* Pushed T_ASTFLT into tf_trapno on entry. */ + pushl %esp + call _C_LABEL(trap) + addl $4,%esp + jmp .Lsyscall_checkast /* re-check ASTs */ +IDTVEC_END(syscall) + +IDTVEC(svr4_fasttrap) + pushl $2 # size of instruction for restart + pushl $T_ASTFLT # trap # for doing ASTs + INTRENTRY + STI(%eax) + pushl $RW_READER + pushl $_C_LABEL(svr4_fasttrap_lock) + call _C_LABEL(rw_enter) + addl $8,%esp + call *_C_LABEL(svr4_fasttrap_vec) + pushl $_C_LABEL(svr4_fasttrap_lock) + call _C_LABEL(rw_exit) + addl $4,%esp +2: /* Check for ASTs on exit to user mode. */ + cli + CHECK_ASTPENDING(%eax) + je 1f + /* Always returning to user mode here. */ + CLEAR_ASTPENDING(%eax) + sti + /* Pushed T_ASTFLT into tf_trapno on entry. */ + pushl %esp + call _C_LABEL(trap) + addl $4,%esp + jmp 2b +1: CHECK_DEFERRED_SWITCH + jnz 9f + INTRFASTEXIT +9: sti + call _C_LABEL(pmap_load) + cli + jmp 2b #if NNPX > 0 /* @@ -969,6 +1284,7 @@ NENTRY(probeintr) outb %al,$0xf0 # clear BUSY# latch popl %eax iret +END(probeintr) /* * void probetrap(void) @@ -978,6 +1294,7 @@ NENTRY(probetrap) incl _C_LABEL(npx_traps_while_probing) fnclex iret +END(probetrap) /* * int npx586bug1(int a, int b) @@ -993,21 +1310,25 @@ NENTRY(npx586bug1) fistpl (%esp) popl %eax ret +END(npx586bug1) #endif /* NNPX > 0 */ /* - * void sse2_zero_page(void *pg) + * void sse2_idlezero_page(void *pg) * - * Zero a page without polluting the cache. + * Zero a page without polluting the cache. Preemption must be + * disabled by the caller. Abort if a preemption is pending. */ -ENTRY(sse2_zero_page) +ENTRY(sse2_idlezero_page) pushl %ebp movl %esp,%ebp movl 8(%esp), %edx - movl $PAGE_SIZE, %ecx + movl $(PAGE_SIZE/32), %ecx xorl %eax, %eax .align 16 1: + testl $RESCHED_KPREEMPT, CPUVAR(RESCHED) + jnz 2f movnti %eax, 0(%edx) movnti %eax, 4(%edx) movnti %eax, 8(%edx) @@ -1016,43 +1337,15 @@ ENTRY(sse2_zero_page) movnti %eax, 20(%edx) movnti %eax, 24(%edx) movnti %eax, 28(%edx) - subl $32, %ecx - leal 32(%edx), %edx + addl $32, %edx + decl %ecx jnz 1b sfence + incl %eax pop %ebp ret - -/* - * void sse2_copy_page(void *src, void *dst) - * - * Copy a page without polluting the cache. - */ -ENTRY(sse2_copy_page) - pushl %ebp - pushl %ebx - pushl %esi - pushl %edi - movl 20(%esp), %esi - movl 24(%esp), %edi - movl $PAGE_SIZE, %ebp - .align 16 -1: - movl 0(%esi), %eax - movl 4(%esi), %ebx - movl 8(%esi), %ecx - movl 12(%esi), %edx - movnti %eax, 0(%edi) - movnti %ebx, 4(%edi) - movnti %ecx, 8(%edi) - movnti %edx, 12(%edi) - subl $16, %ebp - leal 16(%esi), %esi - leal 16(%edi), %edi - jnz 1b +2: sfence - popl %edi - popl %esi - popl %ebx popl %ebp ret +END(sse2_idlezero_page)