MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/S3Asm.nasm

   1 ;; @file
   2 ;   This is the assembly code for transferring to control to OS S3 waking vector
   3 ;   for IA32 platform
   4 ;
   5 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   6 ;
   7 ; This program and the accompanying materials
   8 ; are 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     SECTION .text
  17
  18 global ASM_PFX(AsmFixAddress16)
  19 global ASM_PFX(AsmJmpAddr32)
  20
  21 ;-----------------------------------------
  22 ;VOID
  23 ;AsmTransferControl (
  24 ;  IN   UINT32           S3WakingVector,
  25 ;  IN   UINT32           AcpiLowMemoryBase
  26 ;  );
  27 ;-----------------------------------------
  28
  29 global ASM_PFX(AsmTransferControl)
  30 ASM_PFX(AsmTransferControl):
  31     ; S3WakingVector    :DWORD
  32     ; AcpiLowMemoryBase :DWORD
  33     push  ebp
  34     mov   ebp, esp
  35     lea   eax, [.0]
  36     push  0x28               ; CS
  37     push  eax
  38     mov   ecx, [ebp + 8]
  39     shrd  ebx, ecx, 20
  40     and   ecx, 0xf
  41     mov   bx, cx
  42     mov   [@jmp_addr + 1], ebx
  43     retf
  44
  45 BITS 16
  46 .0:
  47     mov   ax, 0x30
  48 o32 mov   ds, eax
  49 o32 mov   es, eax
  50 o32 mov   fs, eax
  51 o32 mov   gs, eax
  52 o32 mov   ss, eax
  53     mov   eax, cr0          ; Get control register 0
  54     and   eax, 0x0fffffffe  ; Clear PE bit (bit #0)
  55     mov   cr0, eax          ; Activate real mode
  56 @jmp_addr:
  57     jmp  0x0:0x0
  58
  59 global ASM_PFX(AsmTransferControl32)
  60 ASM_PFX(AsmTransferControl32):
  61   jmp ASM_PFX(AsmTransferControl)
  62
  63 ; dummy
  64 global ASM_PFX(AsmTransferControl16)
  65 ASM_PFX(AsmTransferControl16):
  66 ASM_PFX(AsmFixAddress16): DD 0
  67 ASM_PFX(AsmJmpAddr32): DD 0
  68