QuarkPlatformPkg/Acpi/Dxe/BootScriptExecutorDxe/IA32/S3Asm.S

   1 ## @file
   2 #
   3 # Copyright (c) 2013-2015 Intel Corporation.
   4 #
   5 # This program and the accompanying materials
   6 # are licensed and made available under the terms and conditions of the BSD License
   7 # which accompanies this distribution.  The full text of the license may be found at
   8 # http://opensource.org/licenses/bsd-license.php
   9 #
  10 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 #-----------------------------------------
  14 #VOID
  15 #AsmTransferControl (
  16 #  IN   UINT32           S3WakingVector,
  17 #  IN   UINT32           AcpiLowMemoryBase
  18 #  );
  19 #-----------------------------------------
  20
  21 ASM_GLOBAL ASM_PFX(AsmTransferControl)
  22 ASM_PFX(AsmTransferControl):
  23     # S3WakingVector    :DWORD
  24     # AcpiLowMemoryBase :DWORD
  25     pushl %ebp
  26     movl  %esp,%ebp
  27     leal  LABLE, %eax
  28     pushl $0x28             # CS
  29     pushl %eax
  30     movl  8(%ebp),%ecx
  31     shrdl $20,%ecx,%ebx
  32     andl  $0xf,%ecx
  33     movw  %cx,%bx
  34     movl  %ebx, jmp_addr
  35     lret
  36 LABLE:
  37     .byte 0xb8,0x30,0       # mov ax, 30h as selector
  38     movw  %ax,%ds
  39     movw  %ax,%es
  40     movw  %ax,%fs
  41     movw  %ax,%gs
  42     movw  %ax,%ss
  43     movl  %cr0, %eax        # Get control register 0
  44     .byte 0x66
  45     .byte 0x83,0xe0,0xfe    # and    eax, 0fffffffeh  ; Clear PE bit (bit #0)
  46     .byte 0xf,0x22,0xc0     # mov    cr0, eax         ; Activate real mode
  47     .byte 0xea              # jmp far @jmp_addr
  48 jmp_addr:
  49     .long    0
  50