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

   1 ## @file
   2 #
   3 # Copyright (c) 2013-2015 Intel Corporation.
   4 #
   5 # SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 #-----------------------------------------
   8 #VOID
   9 #AsmTransferControl (
  10 #  IN   UINT32           S3WakingVector,
  11 #  IN   UINT32           AcpiLowMemoryBase
  12 #  );
  13 #-----------------------------------------
  14
  15 ASM_GLOBAL ASM_PFX(AsmTransferControl)
  16 ASM_PFX(AsmTransferControl):
  17     # S3WakingVector    :DWORD
  18     # AcpiLowMemoryBase :DWORD
  19     pushl %ebp
  20     movl  %esp,%ebp
  21     leal  LABLE, %eax
  22     pushl $0x28             # CS
  23     pushl %eax
  24     movl  8(%ebp),%ecx
  25     shrdl $20,%ecx,%ebx
  26     andl  $0xf,%ecx
  27     movw  %cx,%bx
  28     movl  %ebx, jmp_addr
  29     lret
  30 LABLE:
  31     .byte 0xb8,0x30,0       # mov ax, 30h as selector
  32     movw  %ax,%ds
  33     movw  %ax,%es
  34     movw  %ax,%fs
  35     movw  %ax,%gs
  36     movw  %ax,%ss
  37     movl  %cr0, %eax        # Get control register 0
  38     .byte 0x66
  39     .byte 0x83,0xe0,0xfe    # and    eax, 0fffffffeh  ; Clear PE bit (bit #0)
  40     .byte 0xf,0x22,0xc0     # mov    cr0, eax         ; Activate real mode
  41     .byte 0xea              # jmp far @jmp_addr
  42 jmp_addr:
  43     .long    0
  44