arch/i386/power/swsusp.S

   1 .text
   2
   3 /* Originally gcc generated, modified by hand
   4  *
   5  * This may not use any stack, nor any variable that is not "NoSave":
   6  *
   7  * Its rewriting one kernel image with another. What is stack in "old"
   8  * image could very well be data page in "new" image, and overwriting
   9  * your own stack under you is bad idea.
  10  */
  11
  12 #include <linux/linkage.h>
  13 #include <asm/segment.h>
  14 #include <asm/page.h>
  15 #include <asm/asm_offsets.h>
  16
  17         .text
  18
  19 ENTRY(swsusp_arch_suspend)
  20
  21         movl %esp, saved_context_esp
  22         movl %ebx, saved_context_ebx
  23         movl %ebp, saved_context_ebp
  24         movl %esi, saved_context_esi
  25         movl %edi, saved_context_edi
  26         pushfl ; popl saved_context_eflags
  27
  28         call swsusp_save
  29         ret
  30
  31 ENTRY(swsusp_arch_resume)
  32         movl    $swsusp_pg_dir-__PAGE_OFFSET, %ecx
  33         movl    %ecx, %cr3
  34
  35         movl    pagedir_nosave, %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         /* Flush TLB, including "global" things (vmalloc) */
  55         movl    mmu_cr4_features, %eax
  56         movl    %eax, %edx
  57         andl    $~(1<<7), %edx;  # PGE
  58         movl    %edx, %cr4;  # turn off PGE
  59         movl    %cr3, %ecx;  # flush TLB
  60         movl    %ecx, %cr3
  61         movl    %eax, %cr4;  # turn PGE back on
  62
  63         movl saved_context_esp, %esp
  64         movl saved_context_ebp, %ebp
  65         movl saved_context_ebx, %ebx
  66         movl saved_context_esi, %esi
  67         movl saved_context_edi, %edi
  68
  69         pushl saved_context_eflags ; popfl
  70
  71         xorl    %eax, %eax
  72
  73         ret