root/arch/x86/kernel/acpi/wakeup_64.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 .text
   3 #include <linux/linkage.h>
   4 #include <asm/segment.h>
   5 #include <asm/pgtable_types.h>
   6 #include <asm/page_types.h>
   7 #include <asm/msr.h>
   8 #include <asm/asm-offsets.h>
   9 #include <asm/frame.h>
  10 
  11 # Copyright 2003 Pavel Machek <pavel@suse.cz
  12 
  13 .code64
  14         /*
  15          * Hooray, we are in Long 64-bit mode (but still running in low memory)
  16          */
  17 ENTRY(wakeup_long64)
  18         movq    saved_magic, %rax
  19         movq    $0x123456789abcdef0, %rdx
  20         cmpq    %rdx, %rax
  21         je      2f
  22 
  23         /* stop here on a saved_magic mismatch */
  24         movq $0xbad6d61676963, %rcx
  25 1:
  26         jmp 1b
  27 2:
  28         movw    $__KERNEL_DS, %ax
  29         movw    %ax, %ss        
  30         movw    %ax, %ds
  31         movw    %ax, %es
  32         movw    %ax, %fs
  33         movw    %ax, %gs
  34         movq    saved_rsp, %rsp
  35 
  36         movq    saved_rbx, %rbx
  37         movq    saved_rdi, %rdi
  38         movq    saved_rsi, %rsi
  39         movq    saved_rbp, %rbp
  40 
  41         movq    saved_rip, %rax
  42         jmp     *%rax
  43 ENDPROC(wakeup_long64)
  44 
  45 ENTRY(do_suspend_lowlevel)
  46         FRAME_BEGIN
  47         subq    $8, %rsp
  48         xorl    %eax, %eax
  49         call    save_processor_state
  50 
  51         movq    $saved_context, %rax
  52         movq    %rsp, pt_regs_sp(%rax)
  53         movq    %rbp, pt_regs_bp(%rax)
  54         movq    %rsi, pt_regs_si(%rax)
  55         movq    %rdi, pt_regs_di(%rax)
  56         movq    %rbx, pt_regs_bx(%rax)
  57         movq    %rcx, pt_regs_cx(%rax)
  58         movq    %rdx, pt_regs_dx(%rax)
  59         movq    %r8, pt_regs_r8(%rax)
  60         movq    %r9, pt_regs_r9(%rax)
  61         movq    %r10, pt_regs_r10(%rax)
  62         movq    %r11, pt_regs_r11(%rax)
  63         movq    %r12, pt_regs_r12(%rax)
  64         movq    %r13, pt_regs_r13(%rax)
  65         movq    %r14, pt_regs_r14(%rax)
  66         movq    %r15, pt_regs_r15(%rax)
  67         pushfq
  68         popq    pt_regs_flags(%rax)
  69 
  70         movq    $.Lresume_point, saved_rip(%rip)
  71 
  72         movq    %rsp, saved_rsp
  73         movq    %rbp, saved_rbp
  74         movq    %rbx, saved_rbx
  75         movq    %rdi, saved_rdi
  76         movq    %rsi, saved_rsi
  77 
  78         addq    $8, %rsp
  79         movl    $3, %edi
  80         xorl    %eax, %eax
  81         call    x86_acpi_enter_sleep_state
  82         /* in case something went wrong, restore the machine status and go on */
  83         jmp     .Lresume_point
  84 
  85         .align 4
  86 .Lresume_point:
  87         /* We don't restore %rax, it must be 0 anyway */
  88         movq    $saved_context, %rax
  89         movq    saved_context_cr4(%rax), %rbx
  90         movq    %rbx, %cr4
  91         movq    saved_context_cr3(%rax), %rbx
  92         movq    %rbx, %cr3
  93         movq    saved_context_cr2(%rax), %rbx
  94         movq    %rbx, %cr2
  95         movq    saved_context_cr0(%rax), %rbx
  96         movq    %rbx, %cr0
  97         pushq   pt_regs_flags(%rax)
  98         popfq
  99         movq    pt_regs_sp(%rax), %rsp
 100         movq    pt_regs_bp(%rax), %rbp
 101         movq    pt_regs_si(%rax), %rsi
 102         movq    pt_regs_di(%rax), %rdi
 103         movq    pt_regs_bx(%rax), %rbx
 104         movq    pt_regs_cx(%rax), %rcx
 105         movq    pt_regs_dx(%rax), %rdx
 106         movq    pt_regs_r8(%rax), %r8
 107         movq    pt_regs_r9(%rax), %r9
 108         movq    pt_regs_r10(%rax), %r10
 109         movq    pt_regs_r11(%rax), %r11
 110         movq    pt_regs_r12(%rax), %r12
 111         movq    pt_regs_r13(%rax), %r13
 112         movq    pt_regs_r14(%rax), %r14
 113         movq    pt_regs_r15(%rax), %r15
 114 
 115 #ifdef CONFIG_KASAN
 116         /*
 117          * The suspend path may have poisoned some areas deeper in the stack,
 118          * which we now need to unpoison.
 119          */
 120         movq    %rsp, %rdi
 121         call    kasan_unpoison_task_stack_below
 122 #endif
 123 
 124         xorl    %eax, %eax
 125         addq    $8, %rsp
 126         FRAME_END
 127         jmp     restore_processor_state
 128 ENDPROC(do_suspend_lowlevel)
 129 
 130 .data
 131 saved_rbp:              .quad   0
 132 saved_rsi:              .quad   0
 133 saved_rdi:              .quad   0
 134 saved_rbx:              .quad   0
 135 
 136 saved_rip:              .quad   0
 137 saved_rsp:              .quad   0
 138 
 139 ENTRY(saved_magic)      .quad   0