mirror of https://github.com/acidanthera/audk.git
88 lines
2.5 KiB
NASM
88 lines
2.5 KiB
NASM
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;------------------------------------------------------------------------------ ;
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; Copyright (c) 2016, 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.nasm
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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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extern ASM_PFX(SmmInitHandler)
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extern ASM_PFX(mRebasedFlag)
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extern ASM_PFX(mSmmRelocationOriginalAddress)
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global ASM_PFX(gSmmCr3)
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global ASM_PFX(gSmmCr4)
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global ASM_PFX(gSmmCr0)
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global ASM_PFX(gSmmJmpAddr)
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global ASM_PFX(gSmmInitStack)
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global ASM_PFX(gcSmiInitGdtr)
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global ASM_PFX(gcSmmInitSize)
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global ASM_PFX(gcSmmInitTemplate)
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%define PROTECT_MODE_CS 0x8
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%define PROTECT_MODE_DS 0x20
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SECTION .text
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ASM_PFX(gcSmiInitGdtr):
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DW 0
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DQ 0
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global ASM_PFX(SmmStartup)
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ASM_PFX(SmmStartup):
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DB 0x66, 0xb8
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ASM_PFX(gSmmCr3): DD 0
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mov cr3, eax
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DB 0x67, 0x66
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lgdt [cs:ebp + (ASM_PFX(gcSmiInitGdtr) - ASM_PFX(SmmStartup))]
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DB 0x66, 0xb8
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ASM_PFX(gSmmCr4): DD 0
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mov cr4, eax
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DB 0x66, 0xb8
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ASM_PFX(gSmmCr0): DD 0
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DB 0xbf, PROTECT_MODE_DS, 0 ; mov di, PROTECT_MODE_DS
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mov cr0, eax
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DB 0x66, 0xea ; jmp far [ptr48]
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ASM_PFX(gSmmJmpAddr):
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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 0xbc ; mov esp, imm32
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ASM_PFX(gSmmInitStack): DD 0
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call ASM_PFX(SmmInitHandler)
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rsm
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BITS 16
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ASM_PFX(gcSmmInitTemplate):
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mov ebp, ASM_PFX(SmmStartup)
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sub ebp, 0x30000
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jmp ebp
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ASM_PFX(gcSmmInitSize): DW $ - ASM_PFX(gcSmmInitTemplate)
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BITS 32
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global ASM_PFX(SmmRelocationSemaphoreComplete)
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ASM_PFX(SmmRelocationSemaphoreComplete):
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push eax
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mov eax, [ASM_PFX(mRebasedFlag)]
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mov byte [eax], 1
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pop eax
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jmp [ASM_PFX(mSmmRelocationOriginalAddress)]
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