2d4a34c936
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>
79 lines
1.5 KiB
ArmAsm
79 lines
1.5 KiB
ArmAsm
.text
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/* Originally gcc generated, modified by hand
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*
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* This may not use any stack, nor any variable that is not "NoSave":
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*
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* Its rewriting one kernel image with another. What is stack in "old"
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* image could very well be data page in "new" image, and overwriting
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* your own stack under you is bad idea.
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*/
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#include <linux/linkage.h>
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#include <asm/segment.h>
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#include <asm/page.h>
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#include <asm/asm-offsets.h>
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.text
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ENTRY(swsusp_arch_suspend)
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movl %esp, saved_context_esp
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movl %ebx, saved_context_ebx
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movl %ebp, saved_context_ebp
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movl %esi, saved_context_esi
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movl %edi, saved_context_edi
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pushfl ; popl saved_context_eflags
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call swsusp_save
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ret
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ENTRY(restore_image)
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movl resume_pg_dir, %ecx
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subl $__PAGE_OFFSET, %ecx
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movl %ecx, %cr3
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movl restore_pblist, %edx
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.p2align 4,,7
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copy_loop:
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testl %edx, %edx
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jz done
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movl pbe_address(%edx), %esi
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movl pbe_orig_address(%edx), %edi
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movl $1024, %ecx
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rep
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movsl
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movl pbe_next(%edx), %edx
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jmp copy_loop
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.p2align 4,,7
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done:
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/* go back to the original page tables */
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movl $swapper_pg_dir, %ecx
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subl $__PAGE_OFFSET, %ecx
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movl %ecx, %cr3
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/* Flush TLB, including "global" things (vmalloc) */
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movl mmu_cr4_features, %eax
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movl %eax, %edx
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andl $~(1<<7), %edx; # PGE
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movl %edx, %cr4; # turn off PGE
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movl %cr3, %ecx; # flush TLB
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movl %ecx, %cr3
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movl %eax, %cr4; # turn PGE back on
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movl saved_context_esp, %esp
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movl saved_context_ebp, %ebp
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movl saved_context_ebx, %ebx
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movl saved_context_esi, %esi
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movl saved_context_edi, %edi
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pushl saved_context_eflags ; popfl
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xorl %eax, %eax
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ret
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