mirror of https://github.com/acidanthera/audk.git
71 lines
1.9 KiB
NASM
71 lines
1.9 KiB
NASM
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;; @file
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; This is the assembly code for transferring to control to OS S3 waking vector
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; for IA32 platform
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;
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; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
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;
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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;;
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.586P
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.model flat,C
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.code
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EXTERNDEF AsmFixAddress16:DWORD
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EXTERNDEF AsmJmpAddr32:DWORD
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;-----------------------------------------
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;VOID
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;AsmTransferControl (
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; IN UINT32 S3WakingVector,
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; IN UINT32 AcpiLowMemoryBase
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; );
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;-----------------------------------------
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AsmTransferControl PROC
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; S3WakingVector :DWORD
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; AcpiLowMemoryBase :DWORD
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push ebp
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mov ebp, esp
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lea eax, @F
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push 28h ; CS
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push eax
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mov ecx, [ebp + 8]
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shrd ebx, ecx, 20
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and ecx, 0fh
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mov bx, cx
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mov @jmp_addr, ebx
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retf
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@@:
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DB 0b8h, 30h, 0 ; mov ax, 30h as selector
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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mov eax, cr0 ; Get control register 0
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DB 66h
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DB 83h, 0e0h, 0feh ; and eax, 0fffffffeh ; Clear PE bit (bit #0)
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DB 0fh, 22h, 0c0h ; mov cr0, eax ; Activate real mode
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DB 0eah ; jmp far @jmp_addr
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@jmp_addr DD ?
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AsmTransferControl ENDP
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AsmTransferControl32 PROC
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jmp AsmTransferControl
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AsmTransferControl32 ENDP
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; dummy
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AsmTransferControl16 PROC
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AsmFixAddress16 DD ?
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AsmJmpAddr32 DD ?
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AsmTransferControl16 ENDP
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END
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