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;------------------------------------------------------------------------------ ;
; Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution. The full text of the license may be found at
; http://opensource.org/licenses/bsd-license.php.
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
; Module Name:
;
; SmmInit.Asm
;
; Abstract:
;
; Functions for relocating SMBASE's for all processors
;
;-------------------------------------------------------------------------------
EXTERNDEF SmmInitHandler:PROC
EXTERNDEF gSmmCr0:DWORD
EXTERNDEF gSmmCr3:DWORD
EXTERNDEF gSmmCr4:DWORD
EXTERNDEF gSmmJmpAddr:QWORD
EXTERNDEF gcSmmInitTemplate:BYTE
EXTERNDEF gcSmmInitSize:WORD
EXTERNDEF mRebasedFlag:PTR BYTE
EXTERNDEF mSmmRelocationOriginalAddress:QWORD
EXTERNDEF mRebasedFlagAddr32:DWORD
EXTERNDEF mSmmRelocationOriginalAddressPtr32:DWORD
EXTERNDEF gSmmInitStack:QWORD
EXTERNDEF gcSmiInitGdtr:FWORD
.code
gcSmiInitGdtr LABEL FWORD
DW 0
DQ 0
SmmStartup PROC
DB 66h, 0b8h ; mov eax, imm32
gSmmCr3 DD ?
mov cr3, rax
DB 66h, 2eh
lgdt fword ptr [ebp + (offset gcSmiInitGdtr - SmmStartup)]
DB 66h, 0b8h ; mov eax, imm32
gSmmCr4 DD ?
or ah, 2 ; enable XMM registers access
mov cr4, rax
DB 66h
mov ecx, 0c0000080h ; IA32_EFER MSR
rdmsr
or ah, 1 ; set LME bit
wrmsr
DB 66h, 0b8h ; mov eax, imm32
gSmmCr0 DD ?
mov cr0, rax ; enable protected mode & paging
DB 66h, 0eah ; far jmp to long mode
gSmmJmpAddr DQ @LongMode
@LongMode: ; long-mode starts here
DB 48h, 0bch ; mov rsp, imm64
gSmmInitStack DQ ?
and sp, 0fff0h ; make sure RSP is 16-byte aligned
;
; Accoring to X64 calling convention, XMM0~5 are volatile, we need to save
; them before calling C-function.
;
sub rsp, 60h
movdqa [rsp], xmm0
movdqa [rsp + 10h], xmm1
movdqa [rsp + 20h], xmm2
movdqa [rsp + 30h], xmm3
movdqa [rsp + 40h], xmm4
movdqa [rsp + 50h], xmm5
add rsp, -20h
call SmmInitHandler
add rsp, 20h
;
; Restore XMM0~5 after calling C-function.
;
movdqa xmm0, [rsp]
movdqa xmm1, [rsp + 10h]
movdqa xmm2, [rsp + 20h]
movdqa xmm3, [rsp + 30h]
movdqa xmm4, [rsp + 40h]
movdqa xmm5, [rsp + 50h]
rsm
SmmStartup ENDP
gcSmmInitTemplate LABEL BYTE
_SmmInitTemplate PROC
DB 66h, 2eh, 8bh, 2eh ; mov ebp, cs:[@F]
DW @L1 - _SmmInitTemplate + 8000h
DB 66h, 81h, 0edh, 00h, 00h, 03h, 00 ; sub ebp, 30000h
jmp bp ; jmp ebp actually
@L1:
DQ SmmStartup
_SmmInitTemplate ENDP
gcSmmInitSize DW $ - gcSmmInitTemplate
SmmRelocationSemaphoreComplete PROC
push rax
mov rax, mRebasedFlag
mov byte ptr [rax], 1
pop rax
jmp [mSmmRelocationOriginalAddress]
SmmRelocationSemaphoreComplete ENDP
;
; Semaphore code running in 32-bit mode
;
SmmRelocationSemaphoreComplete32 PROC
;
; mov byte ptr [], 1
;
db 0c6h, 05h
mRebasedFlagAddr32 dd 0
db 1
;
; jmp dword ptr []
;
db 0ffh, 25h
mSmmRelocationOriginalAddressPtr32 dd 0
SmmRelocationSemaphoreComplete32 ENDP
END
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