MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/X64/S3Asm.S

   1 ## @file
   2 #   This is the assembly code for transferring to control to OS S3 waking vector
   3 #   for X64 platform
   4 #
   5 # Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   6 #
   7 # This program and the accompanying materials are
   8 # licensed and made available under the terms and conditions of the BSD License
   9 # which accompanies this distribution.  The full text of the license may be found at
  10 # http://opensource.org/licenses/bsd-license.php
  11 #
  12 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 #
  15 ##
  16
  17 ASM_GLOBAL ASM_PFX(AsmTransferControl)
  18 ASM_PFX(AsmTransferControl):
  19     # rcx S3WakingVector    :DWORD
  20     # rdx AcpiLowMemoryBase :DWORD
  21     lea   _AsmTransferControl_al_0000, %eax
  22     movq  $0x2800000000, %r8
  23     orq   %r8, %rax
  24     pushq %rax
  25     shrd  $20, %ecx, %ebx
  26     andl  $0x0f, %ecx
  27     movw  %cx, %bx
  28     movl  %ebx, jmp_addr
  29     lret
  30 _AsmTransferControl_al_0000:
  31     .byte    0x0b8, 0x30, 0      # mov ax, 30h as selector
  32     movl  %eax, %ds
  33     movl  %eax, %es
  34     movl  %eax, %fs
  35     movl  %eax, %gs
  36     movl  %eax, %ss
  37     movq  %cr0, %rax
  38     movq  %cr4, %rbx
  39     .byte    0x66
  40     andl  $0x7ffffffe, %eax
  41     andb  $0xdf, %bl
  42     movq  %rax, %cr0
  43     .byte    0x66
  44     movl  $0x0c0000080, %ecx
  45     rdmsr
  46     andb  $0xfe, %ah
  47     wrmsr
  48     movq  %rbx, %cr4
  49     .byte    0x0ea              # jmp far jmp_addr
  50 jmp_addr:
  51     .long    0
  52
  53 ASM_GLOBAL ASM_PFX(AsmTransferControl32)
  54 ASM_PFX(AsmTransferControl32):
  55     # S3WakingVector    :DWORD
  56     # AcpiLowMemoryBase :DWORD
  57     pushq %rbp
  58     movl  %esp,%ebp
  59     .byte 0x8d, 0x05        #  lea   eax, AsmTransferControl16
  60 ASM_GLOBAL ASM_PFX(AsmFixAddress16)
  61 ASM_PFX(AsmFixAddress16):
  62     .long    0
  63     pushq $0x28             # CS
  64     pushq %rax
  65     lret
  66
  67 ASM_GLOBAL ASM_PFX(AsmTransferControl16)
  68 ASM_PFX(AsmTransferControl16):
  69     .byte 0xb8,0x30,0       # mov ax, 30h as selector
  70     movw  %ax,%ds
  71     movw  %ax,%es
  72     movw  %ax,%fs
  73     movw  %ax,%gs
  74     movw  %ax,%ss
  75     movq  %cr0, %rax        # Get control register 0
  76     .byte 0x66
  77     .byte 0x83,0xe0,0xfe    # and    eax, 0fffffffeh  ; Clear PE bit (bit #0)
  78     .byte 0xf,0x22,0xc0     # mov    cr0, eax         ; Activate real mode
  79     .byte 0xea              # jmp far AsmJmpAddr32
  80 ASM_GLOBAL ASM_PFX(AsmJmpAddr32)
  81 ASM_PFX(AsmJmpAddr32):
  82     .long    0