diff options
Diffstat (limited to 'UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm')
| -rw-r--r-- | UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm new file mode 100644 index 0000000000..9182f0293a --- /dev/null +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm @@ -0,0 +1,132 @@ +;------------------------------------------------------------------------------ ;
+; 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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