arch/x86/power/hibernate_asm_32.S

   1 .text
   2
   3 /*
   4  * This may not use any stack, nor any variable that is not "NoSave":
   5  *
   6  * Its rewriting one kernel image with another. What is stack in "old"
   7  * image could very well be data page in "new" image, and overwriting
   8  * your own stack under you is bad idea.
   9  */
  10
  11 #include <linux/linkage.h>
  12 #include <asm/segment.h>
  13 #include <asm/page.h>
  14 #include <asm/asm-offsets.h>
  15
  16         .text
  17
  18 ENTRY(swsusp_arch_suspend)
  19
  20         movl %esp, saved_context_esp
  21         movl %ebx, saved_context_ebx
  22         movl %ebp, saved_context_ebp
  23         movl %esi, saved_context_esi
  24         movl %edi, saved_context_edi
  25         pushfl ; popl saved_context_eflags
  26
  27         call swsusp_save
  28         ret
  29
  30 ENTRY(restore_image)
  31         movl    resume_pg_dir, %ecx
  32         subl    $__PAGE_OFFSET, %ecx
  33         movl    %ecx, %cr3
  34
  35         movl    restore_pblist, %edx
  36         .p2align 4,,7
  37
  38 copy_loop:
  39         testl   %edx, %edx
  40         jz      done
  41
  42         movl    pbe_address(%edx), %esi
  43         movl    pbe_orig_address(%edx), %edi
  44
  45         movl    $1024, %ecx
  46         rep
  47         movsl
  48
  49         movl    pbe_next(%edx), %edx
  50         jmp     copy_loop
  51         .p2align 4,,7
  52
  53 done:
  54         /* go back to the original page tables */
  55         movl    $swapper_pg_dir, %ecx
  56         subl    $__PAGE_OFFSET, %ecx
  57         movl    %ecx, %cr3
  58         /* Flush TLB, including "global" things (vmalloc) */
  59         movl    mmu_cr4_features, %eax
  60         movl    %eax, %edx
  61         andl    $~(1<<7), %edx;  # PGE
  62         movl    %edx, %cr4;  # turn off PGE
  63         movl    %cr3, %ecx;  # flush TLB
  64         movl    %ecx, %cr3
  65         movl    %eax, %cr4;  # turn PGE back on
  66
  67         movl saved_context_esp, %esp
  68         movl saved_context_ebp, %ebp
  69         movl saved_context_ebx, %ebx
  70         movl saved_context_esi, %esi
  71         movl saved_context_edi, %edi
  72
  73         pushl saved_context_eflags ; popfl
  74
  75         xorl    %eax, %eax
  76
  77         ret