mirror of https://github.com/acidanthera/audk.git
95 lines
2.6 KiB
NASM
95 lines
2.6 KiB
NASM
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;------------------------------------------------------------------------------ ;
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; Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
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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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; Module Name:
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;
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; SmmInit.Asm
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;
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; Abstract:
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;
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; Functions for relocating SMBASE's for all processors
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;
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;-------------------------------------------------------------------------------
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.686p
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.xmm
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.model flat,C
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SmmInitHandler PROTO C
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EXTERNDEF C gSmmCr0:DWORD
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EXTERNDEF C gSmmCr3:DWORD
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EXTERNDEF C gSmmCr4:DWORD
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EXTERNDEF C gcSmmInitTemplate:BYTE
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EXTERNDEF C gcSmmInitSize:WORD
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EXTERNDEF C gSmmJmpAddr:QWORD
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EXTERNDEF C mRebasedFlag:PTR BYTE
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EXTERNDEF C mSmmRelocationOriginalAddress:DWORD
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EXTERNDEF C gSmmInitStack:DWORD
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EXTERNDEF C gcSmiInitGdtr:FWORD
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PROTECT_MODE_CS EQU 08h
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PROTECT_MODE_DS EQU 20h
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.code
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gcSmiInitGdtr LABEL FWORD
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DW 0
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DQ 0
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SmmStartup PROC
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DB 66h, 0b8h
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gSmmCr3 DD ?
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mov cr3, eax
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DB 67h, 66h
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lgdt fword ptr cs:[ebp + (offset gcSmiInitGdtr - SmmStartup)]
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DB 66h, 0b8h
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gSmmCr4 DD ?
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mov cr4, eax
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DB 66h, 0b8h
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gSmmCr0 DD ?
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DB 0bfh, PROTECT_MODE_DS, 0 ; mov di, PROTECT_MODE_DS
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mov cr0, eax
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DB 66h, 0eah ; jmp far [ptr48]
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gSmmJmpAddr LABEL QWORD
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DD @32bit
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DW PROTECT_MODE_CS
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@32bit:
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mov ds, edi
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mov es, edi
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mov fs, edi
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mov gs, edi
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mov ss, edi
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DB 0bch ; mov esp, imm32
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gSmmInitStack DD ?
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call SmmInitHandler
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rsm
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SmmStartup ENDP
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gcSmmInitTemplate LABEL BYTE
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_SmmInitTemplate PROC
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DB 66h
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mov ebp, SmmStartup
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DB 66h, 81h, 0edh, 00h, 00h, 03h, 00 ; sub ebp, 30000h
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jmp bp ; jmp ebp actually
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_SmmInitTemplate ENDP
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gcSmmInitSize DW $ - gcSmmInitTemplate
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SmmRelocationSemaphoreComplete PROC
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push eax
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mov eax, mRebasedFlag
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mov byte ptr [eax], 1
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pop eax
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jmp [mSmmRelocationOriginalAddress]
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SmmRelocationSemaphoreComplete ENDP
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END
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