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- /*
- * 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_types.h>
- #include <asm/asm-offsets.h>
- #include <asm/processor-flags.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 mmu_cr4_features, %ecx
- movl resume_pg_dir, %eax
- subl $__PAGE_OFFSET, %eax
- movl %eax, %cr3
- jecxz 1f # cr4 Pentium and higher, skip if zero
- andl $~(X86_CR4_PGE), %ecx
- movl %ecx, %cr4; # turn off PGE
- movl %cr3, %eax; # flush TLB
- movl %eax, %cr3
- 1:
- 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, %eax
- subl $__PAGE_OFFSET, %eax
- movl %eax, %cr3
- movl mmu_cr4_features, %ecx
- jecxz 1f # cr4 Pentium and higher, skip if zero
- movl %ecx, %cr4; # turn PGE back on
- 1:
- 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
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