arch/x86_64/kernel/suspend_asm.S

   1 /* Copyright 2004,2005 Pavel Machek <pavel@suse.cz>, Andi Kleen <ak@suse.de>, Rafael J. Wysocki <rjw@sisk.pl>
   2  *
   3  * Distribute under GPLv2.
   4  *
   5  * swsusp_arch_resume may not use any stack, nor any variable that is
   6  * not "NoSave" during copying pages:
   7  *
   8  * Its rewriting one kernel image with another. What is stack in "old"
   9  * image could very well be data page in "new" image, and overwriting
  10  * your own stack under you is bad idea.
  11  */
  12
  13         .text
  14 #include <linux/linkage.h>
  15 #include <asm/segment.h>
  16 #include <asm/page.h>
  17 #include <asm/offset.h>
  18
  19 ENTRY(swsusp_arch_suspend)
  20
  21         movq %rsp, saved_context_esp(%rip)
  22         movq %rax, saved_context_eax(%rip)
  23         movq %rbx, saved_context_ebx(%rip)
  24         movq %rcx, saved_context_ecx(%rip)
  25         movq %rdx, saved_context_edx(%rip)
  26         movq %rbp, saved_context_ebp(%rip)
  27         movq %rsi, saved_context_esi(%rip)
  28         movq %rdi, saved_context_edi(%rip)
  29         movq %r8,  saved_context_r08(%rip)
  30         movq %r9,  saved_context_r09(%rip)
  31         movq %r10, saved_context_r10(%rip)
  32         movq %r11, saved_context_r11(%rip)
  33         movq %r12, saved_context_r12(%rip)
  34         movq %r13, saved_context_r13(%rip)
  35         movq %r14, saved_context_r14(%rip)
  36         movq %r15, saved_context_r15(%rip)
  37         pushfq ; popq saved_context_eflags(%rip)
  38
  39         call swsusp_save
  40         ret
  41
  42 ENTRY(swsusp_arch_resume)
  43         /* set up cr3 */
  44         leaq    init_level4_pgt(%rip),%rax
  45         subq    $__START_KERNEL_map,%rax
  46         movq    %rax,%cr3
  47
  48         movq    mmu_cr4_features(%rip), %rax
  49         movq    %rax, %rdx
  50         andq    $~(1<<7), %rdx  # PGE
  51         movq    %rdx, %cr4;  # turn off PGE
  52         movq    %cr3, %rcx;  # flush TLB
  53         movq    %rcx, %cr3;
  54         movq    %rax, %cr4;  # turn PGE back on
  55
  56         movq    pagedir_nosave(%rip), %rdx
  57 loop:
  58         testq   %rdx, %rdx
  59         jz      done
  60
  61         /* get addresses from the pbe and copy the page */
  62         movq    pbe_address(%rdx), %rsi
  63         movq    pbe_orig_address(%rdx), %rdi
  64         movq    $512, %rcx
  65         rep
  66         movsq
  67
  68         /* progress to the next pbe */
  69         movq    pbe_next(%rdx), %rdx
  70         jmp     loop
  71 done:
  72         /* Flush TLB, including "global" things (vmalloc) */
  73         movq    mmu_cr4_features(%rip), %rax
  74         movq    %rax, %rdx
  75         andq    $~(1<<7), %rdx;  # PGE
  76         movq    %rdx, %cr4;  # turn off PGE
  77         movq    %cr3, %rcx;  # flush TLB
  78         movq    %rcx, %cr3
  79         movq    %rax, %cr4;  # turn PGE back on
  80
  81         movl    $24, %eax
  82         movl    %eax, %ds
  83
  84         movq saved_context_esp(%rip), %rsp
  85         movq saved_context_ebp(%rip), %rbp
  86         /* Don't restore %rax, it must be 0 anyway */
  87         movq saved_context_ebx(%rip), %rbx
  88         movq saved_context_ecx(%rip), %rcx
  89         movq saved_context_edx(%rip), %rdx
  90         movq saved_context_esi(%rip), %rsi
  91         movq saved_context_edi(%rip), %rdi
  92         movq saved_context_r08(%rip), %r8
  93         movq saved_context_r09(%rip), %r9
  94         movq saved_context_r10(%rip), %r10
  95         movq saved_context_r11(%rip), %r11
  96         movq saved_context_r12(%rip), %r12
  97         movq saved_context_r13(%rip), %r13
  98         movq saved_context_r14(%rip), %r14
  99         movq saved_context_r15(%rip), %r15
 100         pushq saved_context_eflags(%rip) ; popfq
 101
 102         xorq    %rax, %rax
 103
 104         ret