kernel-ark/arch/i386/power/swsusp.S
Rafael J. Wysocki 2d4a34c936 [PATCH] swsusp: Support i386 systems with PAE or without PSE
Make swsusp support i386 systems with PAE or without PSE.

This is done by creating temporary page tables located in resume-safe page
frames before the suspend image is restored in the same way as x86_64 does
it.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Andi Kleen <ak@suse.de>
Cc: Dave Jones <davej@redhat.com>
Cc: Nigel Cunningham <ncunningham@linuxmail.org>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-07 08:39:28 -08:00

79 lines
1.5 KiB
ArmAsm

.text
/* Originally gcc generated, modified by hand
*
* This may not use any stack, nor any variable that is not "NoSave":
*
* Its rewriting one kernel image with another. What is stack in "old"
* image could very well be data page in "new" image, and overwriting
* your own stack under you is bad idea.
*/
#include <linux/linkage.h>
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/asm-offsets.h>
.text
ENTRY(swsusp_arch_suspend)
movl %esp, saved_context_esp
movl %ebx, saved_context_ebx
movl %ebp, saved_context_ebp
movl %esi, saved_context_esi
movl %edi, saved_context_edi
pushfl ; popl saved_context_eflags
call swsusp_save
ret
ENTRY(restore_image)
movl resume_pg_dir, %ecx
subl $__PAGE_OFFSET, %ecx
movl %ecx, %cr3
movl restore_pblist, %edx
.p2align 4,,7
copy_loop:
testl %edx, %edx
jz done
movl pbe_address(%edx), %esi
movl pbe_orig_address(%edx), %edi
movl $1024, %ecx
rep
movsl
movl pbe_next(%edx), %edx
jmp copy_loop
.p2align 4,,7
done:
/* go back to the original page tables */
movl $swapper_pg_dir, %ecx
subl $__PAGE_OFFSET, %ecx
movl %ecx, %cr3
/* Flush TLB, including "global" things (vmalloc) */
movl mmu_cr4_features, %eax
movl %eax, %edx
andl $~(1<<7), %edx; # PGE
movl %edx, %cr4; # turn off PGE
movl %cr3, %ecx; # flush TLB
movl %ecx, %cr3
movl %eax, %cr4; # turn PGE back on
movl saved_context_esp, %esp
movl saved_context_ebp, %ebp
movl saved_context_ebx, %ebx
movl saved_context_esi, %esi
movl saved_context_edi, %edi
pushl saved_context_eflags ; popfl
xorl %eax, %eax
ret