arch/x86/kernel/acpi/wakeup_32.S

   1         .section .text.page_aligned
   2 #include <linux/linkage.h>
   3 #include <asm/segment.h>
   4 #include <asm/page.h>
   5
   6 # Copyright 2003, 2008 Pavel Machek <pavel@suse.cz>, distribute under GPLv2
   7
   8         .code32
   9         ALIGN
  10
  11 ENTRY(wakeup_pmode_return)
  12 wakeup_pmode_return:
  13         movw    $__KERNEL_DS, %ax
  14         movw    %ax, %ss
  15         movw    %ax, %ds
  16         movw    %ax, %es
  17         movw    %ax, %fs
  18         movw    %ax, %gs
  19
  20         # reload the gdt, as we need the full 32 bit address
  21         lgdt    saved_gdt
  22         lidt    saved_idt
  23         lldt    saved_ldt
  24         ljmp    $(__KERNEL_CS), $1f
  25 1:
  26         movl    %cr3, %eax
  27         movl    %eax, %cr3
  28         wbinvd
  29
  30         # and restore the stack ... but you need gdt for this to work
  31         movl    saved_context_esp, %esp
  32
  33         movl    %cs:saved_magic, %eax
  34         cmpl    $0x12345678, %eax
  35         jne     bogus_magic
  36
  37         # jump to place where we left off
  38         movl    saved_eip, %eax
  39         jmp     *%eax
  40
  41 bogus_magic:
  42         jmp     bogus_magic
  43
  44
  45
  46 save_registers:
  47         sgdt    saved_gdt
  48         sidt    saved_idt
  49         sldt    saved_ldt
  50         str     saved_tss
  51
  52         leal    4(%esp), %eax
  53         movl    %eax, saved_context_esp
  54         movl    %ebx, saved_context_ebx
  55         movl    %ebp, saved_context_ebp
  56         movl    %esi, saved_context_esi
  57         movl    %edi, saved_context_edi
  58         pushfl
  59         popl    saved_context_eflags
  60
  61         movl    $ret_point, saved_eip
  62         ret
  63
  64
  65 restore_registers:
  66         movl    saved_context_ebp, %ebp
  67         movl    saved_context_ebx, %ebx
  68         movl    saved_context_esi, %esi
  69         movl    saved_context_edi, %edi
  70         pushl   saved_context_eflags
  71         popfl
  72         ret
  73
  74 ENTRY(do_suspend_lowlevel)
  75         call    save_processor_state
  76         call    save_registers
  77         pushl   $3
  78         call    acpi_enter_sleep_state
  79         addl    $4, %esp
  80
  81 #       In case of S3 failure, we'll emerge here.  Jump
  82 #       to ret_point to recover
  83         jmp     ret_point
  84         .p2align 4,,7
  85 ret_point:
  86         call    restore_registers
  87         call    restore_processor_state
  88         ret
  89
  90 .data
  91 ALIGN
  92 ENTRY(saved_magic)      .long   0
  93 ENTRY(saved_eip)        .long   0
  94
  95 # saved registers
  96 saved_gdt:      .long   0,0
  97 saved_idt:      .long   0,0
  98 saved_ldt:      .long   0
  99 saved_tss:      .long   0
 100