Author: kib
Date: Tue Feb 6 00:02:30 2018
New Revision: 328913
URL: https://svnweb.freebsd.org/changeset/base/328913
Log:
Move signal trampolines out of locore.s into separate source file.
Similar to other arches, the move makes the subject of locore.s only
the kernel startup.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Added:
head/sys/i386/i386/sigtramp.s
- copied, changed from r328903, head/sys/i386/i386/locore.s
Modified:
head/sys/conf/files.i386
head/sys/i386/i386/locore.s
Modified: head/sys/conf/files.i386
==============================================================================
--- head/sys/conf/files.i386 Mon Feb 5 23:38:15 2018 (r328912)
+++ head/sys/conf/files.i386 Tue Feb 6 00:02:30 2018 (r328913)
@@ -494,6 +494,7 @@ i386/i386/perfmon.c optional perfmon
i386/i386/pmap.c standard
i386/i386/prof_machdep.c optional profiling-routine
i386/i386/ptrace_machdep.c standard
+i386/i386/sigtramp.s standard
i386/i386/support.s standard
i386/i386/swtch.s standard
i386/i386/sys_machdep.c standard
Modified: head/sys/i386/i386/locore.s
==============================================================================
--- head/sys/i386/i386/locore.s Mon Feb 5 23:38:15 2018 (r328912)
+++ head/sys/i386/i386/locore.s Tue Feb 6 00:02:30 2018 (r328913)
@@ -44,7 +44,6 @@
#include "opt_nfsroot.h"
#include "opt_pmap.h"
-#include <sys/syscall.h>
#include <sys/reboot.h>
#include <machine/asmacros.h>
@@ -292,77 +291,6 @@ begin:
call mi_startup /* autoconfiguration, mountroot etc */
/* NOTREACHED */
addl $0,%esp /* for db_numargs() again */
-
-/*
- * Signal trampoline, copied to top of user stack
- */
-NON_GPROF_ENTRY(sigcode)
- calll *SIGF_HANDLER(%esp)
- leal SIGF_UC(%esp),%eax /* get ucontext */
- pushl %eax
- testl $PSL_VM,UC_EFLAGS(%eax)
- jne 1f
- mov UC_GS(%eax),%gs /* restore %gs */
-1:
- movl $SYS_sigreturn,%eax
- pushl %eax /* junk to fake return addr. */
- int $0x80 /* enter kernel with args */
- /* on stack */
-1:
- jmp 1b
-
-#ifdef COMPAT_FREEBSD4
- ALIGN_TEXT
-freebsd4_sigcode:
- calll *SIGF_HANDLER(%esp)
- leal SIGF_UC4(%esp),%eax /* get ucontext */
- pushl %eax
- testl $PSL_VM,UC4_EFLAGS(%eax)
- jne 1f
- mov UC4_GS(%eax),%gs /* restore %gs */
-1:
- movl $344,%eax /* 4.x SYS_sigreturn */
- pushl %eax /* junk to fake return addr. */
- int $0x80 /* enter kernel with args */
- /* on stack */
-1:
- jmp 1b
-#endif
-
-#ifdef COMPAT_43
- ALIGN_TEXT
-osigcode:
- call *SIGF_HANDLER(%esp) /* call signal handler */
- lea SIGF_SC(%esp),%eax /* get sigcontext */
- pushl %eax
- testl $PSL_VM,SC_PS(%eax)
- jne 9f
- mov SC_GS(%eax),%gs /* restore %gs */
-9:
- movl $103,%eax /* 3.x SYS_sigreturn */
- pushl %eax /* junk to fake return addr. */
- int $0x80 /* enter kernel with args */
-0: jmp 0b
-#endif /* COMPAT_43 */
-
- ALIGN_TEXT
-esigcode:
-
- .data
- .globl szsigcode
-szsigcode:
- .long esigcode-sigcode
-#ifdef COMPAT_FREEBSD4
- .globl szfreebsd4_sigcode
-szfreebsd4_sigcode:
- .long esigcode-freebsd4_sigcode
-#endif
-#ifdef COMPAT_43
- .globl szosigcode
-szosigcode:
- .long esigcode-osigcode
-#endif
- .text
/**********************************************************************
*
Copied and modified: head/sys/i386/i386/sigtramp.s (from r328903,
head/sys/i386/i386/locore.s)
==============================================================================
--- head/sys/i386/i386/locore.s Mon Feb 5 22:21:51 2018 (r328903, copy
source)
+++ head/sys/i386/i386/sigtramp.s Tue Feb 6 00:02:30 2018
(r328913)
@@ -39,261 +39,15 @@
* and many others.
*/
-#include "opt_bootp.h"
#include "opt_compat.h"
-#include "opt_nfsroot.h"
-#include "opt_pmap.h"
#include <sys/syscall.h>
-#include <sys/reboot.h>
-
#include <machine/asmacros.h>
-#include <machine/cputypes.h>
#include <machine/psl.h>
-#include <machine/pmap.h>
-#include <machine/specialreg.h>
#include "assym.s"
/*
- * XXX
- *
- * Note: This version greatly munged to avoid various assembler errors
- * that may be fixed in newer versions of gas. Perhaps newer versions
- * will have more pleasant appearance.
- */
-
-/*
- * PTmap is recursive pagemap at top of virtual address space.
- * Within PTmap, the page directory can be found (third indirection).
- */
- .globl PTmap,PTD,PTDpde
- .set PTmap,(PTDPTDI << PDRSHIFT)
- .set PTD,PTmap + (PTDPTDI * PAGE_SIZE)
- .set PTDpde,PTD + (PTDPTDI * PDESIZE)
-
-/*
- * Compiled KERNBASE location and the kernel load address
- */
- .globl kernbase
- .set kernbase,KERNBASE
- .globl kernload
- .set kernload,KERNLOAD
-
-/*
- * Globals
- */
- .data
- ALIGN_DATA /* just to be sure */
-
- .space 0x2000 /* space for tmpstk - temporary stack */
-tmpstk:
-
- .globl bootinfo
-bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */
-
- .globl KERNend
-KERNend: .long 0 /* phys addr end of kernel (just after
bss) */
-physfree: .long 0 /* phys addr of next free page */
-
- .globl IdlePTD
-IdlePTD: .long 0 /* phys addr of kernel PTD */
-
-#if defined(PAE) || defined(PAE_TABLES)
- .globl IdlePDPT
-IdlePDPT: .long 0 /* phys addr of kernel PDPT */
-#endif
-
- .globl KPTmap
-KPTmap: .long 0 /* address of kernel page
tables */
-
- .globl KPTphys
-KPTphys: .long 0 /* phys addr of kernel page tables */
-
- .globl proc0kstack
-proc0kstack: .long 0 /* address of proc 0 kstack space */
-p0kpa: .long 0 /* phys addr of proc0's STACK */
-
-vm86phystk: .long 0 /* PA of vm86/bios stack */
-
- .globl vm86paddr, vm86pa
-vm86paddr: .long 0 /* address of vm86 region */
-vm86pa: .long 0 /* phys addr of vm86 region */
-
-/**********************************************************************
- *
- * Some handy macros
- *
- */
-
-#define R(foo) ((foo)-KERNBASE)
-
-#define ALLOCPAGES(foo) \
- movl R(physfree), %esi ; \
- movl $((foo)*PAGE_SIZE), %eax ; \
- addl %esi, %eax ; \
- movl %eax, R(physfree) ; \
- movl %esi, %edi ; \
- movl $((foo)*PAGE_SIZE),%ecx ; \
- xorl %eax,%eax ; \
- cld ; \
- rep ; \
- stosb
-
-/*
- * fillkpt
- * eax = page frame address
- * ebx = index into page table
- * ecx = how many pages to map
- * base = base address of page dir/table
- * prot = protection bits
- */
-#define fillkpt(base, prot) \
- shll $PTESHIFT,%ebx ; \
- addl base,%ebx ; \
- orl $PG_V,%eax ; \
- orl prot,%eax ; \
-1: movl %eax,(%ebx) ; \
- addl $PAGE_SIZE,%eax ; /* increment physical address */ \
- addl $PTESIZE,%ebx ; /* next pte */ \
- loop 1b
-
-/*
- * fillkptphys(prot)
- * eax = physical address
- * ecx = how many pages to map
- * prot = protection bits
- */
-#define fillkptphys(prot) \
- movl %eax, %ebx ; \
- shrl $PAGE_SHIFT, %ebx ; \
- fillkpt(R(KPTphys), prot)
-
- .text
-/**********************************************************************
- *
- * This is where the bootblocks start us, set the ball rolling...
- *
- */
-NON_GPROF_ENTRY(btext)
-
-/* Tell the bios to warmboot next time */
- movw $0x1234,0x472
-
-/* Set up a real frame in case the double return in newboot is executed. */
- pushl %ebp
- movl %esp, %ebp
-
-/* Don't trust what the BIOS gives for eflags. */
- pushl $PSL_KERNEL
- popfl
-
-/*
- * Don't trust what the BIOS gives for %fs and %gs. Trust the bootstrap
- * to set %cs, %ds, %es and %ss.
- */
- mov %ds, %ax
- mov %ax, %fs
- mov %ax, %gs
-
-/*
- * Clear the bss. Not all boot programs do it, and it is our job anyway.
- *
- * XXX we don't check that there is memory for our bss and page tables
- * before using it.
- *
- * Note: we must be careful to not overwrite an active gdt or idt. They
- * inactive from now until we switch to new ones, since we don't load any
- * more segment registers or permit interrupts until after the switch.
- */
- movl $R(end),%ecx
- movl $R(edata),%edi
- subl %edi,%ecx
- xorl %eax,%eax
- cld
- rep
- stosb
-
- call recover_bootinfo
-
-/* Get onto a stack that we can trust. */
-/*
- * XXX this step is delayed in case recover_bootinfo needs to return via
- * the old stack, but it need not be, since recover_bootinfo actually
- * returns via the old frame.
- */
- movl $R(tmpstk),%esp
-
- call identify_cpu
- call create_pagetables
-
-/*
- * If the CPU has support for VME, turn it on.
- */
- testl $CPUID_VME, R(cpu_feature)
- jz 1f
- movl %cr4, %eax
- orl $CR4_VME, %eax
- movl %eax, %cr4
-1:
-
-/* Now enable paging */
-#if defined(PAE) || defined(PAE_TABLES)
- movl R(IdlePDPT), %eax
- movl %eax, %cr3
- movl %cr4, %edx
- orl $CR4_PAE, %edx
- movl %edx, %cr4
-#else
- movl R(IdlePTD), %eax
- movl %eax,%cr3 /* load ptd addr into mmu */
-#endif
- movl %cr0,%edx /* get control word */
- orl $CR0_PE|CR0_PG,%edx /* enable paging */
- movl %edx,%cr0 /* and let's page NOW! */
-
- pushl $begin /* jump to high virtualized address */
- ret
-
-begin:
- /*
- * Now running relocated at KERNBASE where the system is linked to run.
- *
- * Remove the lowest part of the double mapping of low memory to get
- * some null pointer checks.
- */
- movl $0,PTD
- movl %eax,%cr3 /* invalidate TLB */
-
- /* set up bootstrap stack */
- movl proc0kstack,%eax /* location of in-kernel stack */
-
- /*
- * Only use bottom page for init386(). init386() calculates the
- * PCB + FPU save area size and returns the true top of stack.
- */
- leal PAGE_SIZE(%eax),%esp
-
- xorl %ebp,%ebp /* mark end of frames */
-
- pushl physfree /* value of first for init386(first) */
- call init386 /* wire 386 chip for unix operation */
-
- /*
- * Clean up the stack in a way that db_numargs() understands, so
- * that backtraces in ddb don't underrun the stack. Traps for
- * inaccessible memory are more fatal than usual this early.
- */
- addl $4,%esp
-
- /* Switch to true top of stack. */
- movl %eax,%esp
-
- call mi_startup /* autoconfiguration, mountroot etc */
- /* NOTREACHED */
- addl $0,%esp /* for db_numargs() again */
-
-/*
* Signal trampoline, copied to top of user stack
*/
NON_GPROF_ENTRY(sigcode)
@@ -361,500 +115,4 @@ szfreebsd4_sigcode:
.globl szosigcode
szosigcode:
.long esigcode-osigcode
-#endif
- .text
-
-/**********************************************************************
- *
- * Recover the bootinfo passed to us from the boot program
- *
- */
-recover_bootinfo:
- /*
- * This code is called in different ways depending on what loaded
- * and started the kernel. This is used to detect how we get the
- * arguments from the other code and what we do with them.
- *
- * Old disk boot blocks:
- * (*btext)(howto, bootdev, cyloffset, esym);
- * [return address == 0, and can NOT be returned to]
- * [cyloffset was not supported by the FreeBSD boot code
- * and always passed in as 0]
- * [esym is also known as total in the boot code, and
- * was never properly supported by the FreeBSD boot code]
- *
- * Old diskless netboot code:
- * (*btext)(0,0,0,0,&nfsdiskless,0,0,0);
- * [return address != 0, and can NOT be returned to]
- * If we are being booted by this code it will NOT work,
- * so we are just going to halt if we find this case.
- *
- * New uniform boot code:
- * (*btext)(howto, bootdev, 0, 0, 0, &bootinfo)
- * [return address != 0, and can be returned to]
- *
- * There may seem to be a lot of wasted arguments in here, but
- * that is so the newer boot code can still load very old kernels
- * and old boot code can load new kernels.
- */
-
- /*
- * The old style disk boot blocks fake a frame on the stack and
- * did an lret to get here. The frame on the stack has a return
- * address of 0.
- */
- cmpl $0,4(%ebp)
- je olddiskboot
-
- /*
- * We have some form of return address, so this is either the
- * old diskless netboot code, or the new uniform code. That can
- * be detected by looking at the 5th argument, if it is 0
- * we are being booted by the new uniform boot code.
- */
- cmpl $0,24(%ebp)
- je newboot
-
- /*
- * Seems we have been loaded by the old diskless boot code, we
- * don't stand a chance of running as the diskless structure
- * changed considerably between the two, so just halt.
- */
- hlt
-
- /*
- * We have been loaded by the new uniform boot code.
- * Let's check the bootinfo version, and if we do not understand
- * it we return to the loader with a status of 1 to indicate this error
- */
-newboot:
- movl 28(%ebp),%ebx /* &bootinfo.version */
- movl BI_VERSION(%ebx),%eax
- cmpl $1,%eax /* We only understand version 1 */
- je 1f
- movl $1,%eax /* Return status */
- leave
- /*
- * XXX this returns to our caller's caller (as is required) since
- * we didn't set up a frame and our caller did.
- */
- ret
-
-1:
- /*
- * If we have a kernelname copy it in
- */
- movl BI_KERNELNAME(%ebx),%esi
- cmpl $0,%esi
- je 2f /* No kernelname */
- movl $MAXPATHLEN,%ecx /* Brute force!!! */
- movl $R(kernelname),%edi
- cmpb $'/',(%esi) /* Make sure it starts with a slash */
- je 1f
- movb $'/',(%edi)
- incl %edi
- decl %ecx
-1:
- cld
- rep
- movsb
-
-2:
- /*
- * Determine the size of the boot loader's copy of the bootinfo
- * struct. This is impossible to do properly because old versions
- * of the struct don't contain a size field and there are 2 old
- * versions with the same version number.
- */
- movl $BI_ENDCOMMON,%ecx /* prepare for sizeless version */
- testl $RB_BOOTINFO,8(%ebp) /* bi_size (and bootinfo) valid? */
- je got_bi_size /* no, sizeless version */
- movl BI_SIZE(%ebx),%ecx
-got_bi_size:
-
- /*
- * Copy the common part of the bootinfo struct
- */
- movl %ebx,%esi
- movl $R(bootinfo),%edi
- cmpl $BOOTINFO_SIZE,%ecx
- jbe got_common_bi_size
- movl $BOOTINFO_SIZE,%ecx
-got_common_bi_size:
- cld
- rep
- movsb
-
-#ifdef NFS_ROOT
-#ifndef BOOTP_NFSV3
- /*
- * If we have a nfs_diskless structure copy it in
- */
- movl BI_NFS_DISKLESS(%ebx),%esi
- cmpl $0,%esi
- je olddiskboot
- movl $R(nfs_diskless),%edi
- movl $NFSDISKLESS_SIZE,%ecx
- cld
- rep
- movsb
- movl $R(nfs_diskless_valid),%edi
- movl $1,(%edi)
-#endif
-#endif
-
- /*
- * The old style disk boot.
- * (*btext)(howto, bootdev, cyloffset, esym);
- * Note that the newer boot code just falls into here to pick
- * up howto and bootdev, cyloffset and esym are no longer used
- */
-olddiskboot:
- movl 8(%ebp),%eax
- movl %eax,R(boothowto)
- movl 12(%ebp),%eax
- movl %eax,R(bootdev)
-
- ret
-
-
-/**********************************************************************
- *
- * Identify the CPU and initialize anything special about it
- *
- */
-identify_cpu:
-
- /* Try to toggle alignment check flag; does not exist on 386. */
- pushfl
- popl %eax
- movl %eax,%ecx
- orl $PSL_AC,%eax
- pushl %eax
- popfl
- pushfl
- popl %eax
- xorl %ecx,%eax
- andl $PSL_AC,%eax
- pushl %ecx
- popfl
-
- testl %eax,%eax
- jnz try486
-
- /* NexGen CPU does not have aligment check flag. */
- pushfl
- movl $0x5555, %eax
- xorl %edx, %edx
- movl $2, %ecx
- clc
- divl %ecx
- jz trynexgen
- popfl
- movl $CPU_386,R(cpu)
- jmp 3f
-
-trynexgen:
- popfl
- movl $CPU_NX586,R(cpu)
- movl $0x4778654e,R(cpu_vendor) # store vendor string
- movl $0x72446e65,R(cpu_vendor+4)
- movl $0x6e657669,R(cpu_vendor+8)
- movl $0,R(cpu_vendor+12)
- jmp 3f
-
-try486: /* Try to toggle identification flag; does not exist on early
486s. */
- pushfl
- popl %eax
- movl %eax,%ecx
- xorl $PSL_ID,%eax
- pushl %eax
- popfl
- pushfl
- popl %eax
- xorl %ecx,%eax
- andl $PSL_ID,%eax
- pushl %ecx
- popfl
-
- testl %eax,%eax
- jnz trycpuid
- movl $CPU_486,R(cpu)
-
- /*
- * Check Cyrix CPU
- * Cyrix CPUs do not change the undefined flags following
- * execution of the divide instruction which divides 5 by 2.
- *
- * Note: CPUID is enabled on M2, so it passes another way.
- */
- pushfl
- movl $0x5555, %eax
- xorl %edx, %edx
- movl $2, %ecx
- clc
- divl %ecx
- jnc trycyrix
- popfl
- jmp 3f /* You may use Intel CPU. */
-
-trycyrix:
- popfl
- /*
- * IBM Bluelighting CPU also doesn't change the undefined flags.
- * Because IBM doesn't disclose the information for Bluelighting
- * CPU, we couldn't distinguish it from Cyrix's (including IBM
- * brand of Cyrix CPUs).
- */
- movl $0x69727943,R(cpu_vendor) # store vendor string
- movl $0x736e4978,R(cpu_vendor+4)
- movl $0x64616574,R(cpu_vendor+8)
- jmp 3f
-
-trycpuid: /* Use the `cpuid' instruction. */
- xorl %eax,%eax
- cpuid # cpuid 0
- movl %eax,R(cpu_high) # highest capability
- movl %ebx,R(cpu_vendor) # store vendor string
- movl %edx,R(cpu_vendor+4)
- movl %ecx,R(cpu_vendor+8)
- movb $0,R(cpu_vendor+12)
-
- movl $1,%eax
- cpuid # cpuid 1
- movl %eax,R(cpu_id) # store cpu_id
- movl %ebx,R(cpu_procinfo) # store cpu_procinfo
- movl %edx,R(cpu_feature) # store cpu_feature
- movl %ecx,R(cpu_feature2) # store cpu_feature2
- rorl $8,%eax # extract family type
- andl $15,%eax
- cmpl $5,%eax
- jae 1f
-
- /* less than Pentium; must be 486 */
- movl $CPU_486,R(cpu)
- jmp 3f
-1:
- /* a Pentium? */
- cmpl $5,%eax
- jne 2f
- movl $CPU_586,R(cpu)
- jmp 3f
-2:
- /* Greater than Pentium...call it a Pentium Pro */
- movl $CPU_686,R(cpu)
-3:
- ret
-
-
-/**********************************************************************
- *
- * Create the first page directory and its page tables.
- *
- */
-
-create_pagetables:
-
-/* Find end of kernel image (rounded up to a page boundary). */
- movl $R(_end),%esi
-
-/* Include symbols, if any. */
- movl R(bootinfo+BI_ESYMTAB),%edi
- testl %edi,%edi
- je over_symalloc
- movl %edi,%esi
- movl $KERNBASE,%edi
- addl %edi,R(bootinfo+BI_SYMTAB)
- addl %edi,R(bootinfo+BI_ESYMTAB)
-over_symalloc:
-
-/* If we are told where the end of the kernel space is, believe it. */
- movl R(bootinfo+BI_KERNEND),%edi
- testl %edi,%edi
- je no_kernend
- movl %edi,%esi
-no_kernend:
-
- addl $PDRMASK,%esi /* Play conservative for now, and */
- andl $~PDRMASK,%esi /* ... round up to PDR boundary */
- movl %esi,R(KERNend) /* save end of kernel */
- movl %esi,R(physfree) /* next free page is at end of kernel */
-
-/* Allocate Kernel Page Tables */
- ALLOCPAGES(NKPT)
- movl %esi,R(KPTphys)
- addl $(KERNBASE-(KPTDI<<(PDRSHIFT-PAGE_SHIFT+PTESHIFT))),%esi
- movl %esi,R(KPTmap)
-
-/* Allocate Page Table Directory */
-#if defined(PAE) || defined(PAE_TABLES)
- /* XXX only need 32 bytes (easier for now) */
- ALLOCPAGES(1)
- movl %esi,R(IdlePDPT)
-#endif
- ALLOCPAGES(NPGPTD)
- movl %esi,R(IdlePTD)
-
-/* Allocate KSTACK */
- ALLOCPAGES(TD0_KSTACK_PAGES)
- movl %esi,R(p0kpa)
- addl $KERNBASE, %esi
- movl %esi, R(proc0kstack)
-
- ALLOCPAGES(1) /* vm86/bios stack */
- movl %esi,R(vm86phystk)
-
- ALLOCPAGES(3) /* pgtable + ext + IOPAGES */
- movl %esi,R(vm86pa)
- addl $KERNBASE, %esi
- movl %esi, R(vm86paddr)
-
-/*
- * Enable PSE and PGE.
- */
-#ifndef DISABLE_PSE
- testl $CPUID_PSE, R(cpu_feature)
- jz 1f
- movl $PG_PS, R(pseflag)
- movl %cr4, %eax
- orl $CR4_PSE, %eax
- movl %eax, %cr4
-1:
-#endif
-#ifndef DISABLE_PG_G
- testl $CPUID_PGE, R(cpu_feature)
- jz 2f
- movl $PG_G, R(pgeflag)
- movl %cr4, %eax
- orl $CR4_PGE, %eax
- movl %eax, %cr4
-2:
-#endif
-
-/*
- * Initialize page table pages mapping physical address zero through the
- * (physical) end of the kernel. Many of these pages must be reserved,
- * and we reserve them all and map them linearly for convenience. We do
- * this even if we've enabled PSE above; we'll just switch the corresponding
- * kernel PDEs before we turn on paging.
- *
- * XXX: We waste some pages here in the PSE case!
- *
- * This and all other page table entries allow read and write access for
- * various reasons. Kernel mappings never have any access restrictions.
- */
- xorl %eax, %eax
- movl R(KERNend),%ecx
- shrl $PAGE_SHIFT,%ecx
- fillkptphys($PG_RW)
-
-/* Map page table pages. */
- movl R(KPTphys),%eax
- movl $NKPT,%ecx
- fillkptphys($PG_RW)
-
-/* Map page directory. */
-#if defined(PAE) || defined(PAE_TABLES)
- movl R(IdlePDPT), %eax
- movl $1, %ecx
- fillkptphys($PG_RW)
-#endif
-
- movl R(IdlePTD), %eax
- movl $NPGPTD, %ecx
- fillkptphys($PG_RW)
-
-/* Map proc0's KSTACK in the physical way ... */
- movl R(p0kpa), %eax
- movl $(TD0_KSTACK_PAGES), %ecx
- fillkptphys($PG_RW)
-
-/* Map ISA hole */
- movl $ISA_HOLE_START, %eax
- movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx
- fillkptphys($PG_RW)
-
-/* Map space for the vm86 region */
- movl R(vm86phystk), %eax
- movl $4, %ecx
- fillkptphys($PG_RW)
-
-/* Map page 0 into the vm86 page table */
- movl $0, %eax
- movl $0, %ebx
- movl $1, %ecx
- fillkpt(R(vm86pa), $PG_RW|PG_U)
-
-/* ...likewise for the ISA hole */
- movl $ISA_HOLE_START, %eax
- movl $ISA_HOLE_START>>PAGE_SHIFT, %ebx
- movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx
- fillkpt(R(vm86pa), $PG_RW|PG_U)
-
-/*
- * Create an identity mapping for low physical memory, including the kernel.
- * This is only used to map the 2 instructions for jumping to 'begin' in
- * locore (we map everything to avoid having to determine where these
- * instructions are). ACPI resume will transiently restore the first PDE in
- * this mapping (and depend on this PDE's page table created here not being
- * destroyed). See pmap_bootstrap() for more details.
- *
- * Note: There are errata concerning large pages and physical address zero,
- * so a PG_PS mapping should not be used for PDE 0. Our double mapping
- * avoids this automatically by not using PG_PS for PDE #KPDI so that PAT
- * bits can be set at the page level for i/o pages below 1 MB.
- */
- movl R(KPTphys), %eax
- xorl %ebx, %ebx
- movl $NKPT, %ecx
- fillkpt(R(IdlePTD), $PG_RW)
-
-/*
- * Install PDEs for PTs covering enough kva to bootstrap. Then for the PSE
- * case, replace the PDEs whose coverage is strictly within the kernel
- * (between KERNLOAD (rounded up) and KERNend) by large-page PDEs.
- */
- movl R(KPTphys), %eax
- movl $KPTDI, %ebx
- movl $NKPT, %ecx
- fillkpt(R(IdlePTD), $PG_RW)
- cmpl $0,R(pseflag)
- je done_pde
-
- movl R(KERNend), %ecx
- movl $(KERNLOAD + PDRMASK) & ~PDRMASK, %eax
- subl %eax, %ecx
- shrl $PDRSHIFT, %ecx
- movl $KPTDI + ((KERNLOAD + PDRMASK) >> PDRSHIFT), %ebx
- shll $PDESHIFT, %ebx
- addl R(IdlePTD), %ebx
- orl $(PG_V|PG_RW|PG_PS), %eax
-1: movl %eax, (%ebx)
- addl $(1 << PDRSHIFT), %eax
- addl $PDESIZE, %ebx
- loop 1b
-
-done_pde:
-/* install a pde recursively mapping page directory as a page table */
- movl R(IdlePTD), %eax
- movl $PTDPTDI, %ebx
- movl $NPGPTD,%ecx
- fillkpt(R(IdlePTD), $PG_RW)
-
-#if defined(PAE) || defined(PAE_TABLES)
- movl R(IdlePTD), %eax
- xorl %ebx, %ebx
- movl $NPGPTD, %ecx
- fillkpt(R(IdlePDPT), $0x0)
-#endif
-
- ret
-
-#ifdef XENHVM
-/* Xen Hypercall page */
- .text
-.p2align PAGE_SHIFT, 0x90 /* Hypercall_page needs to be PAGE aligned */
-
-NON_GPROF_ENTRY(hypercall_page)
- .skip 0x1000, 0x90 /* Fill with "nop"s */
#endif
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