diff options
Diffstat (limited to 'UefiCpuPkg/Library/SmmCpuFeaturesLib/Ia32/SmiException.nasm')
| -rw-r--r-- | UefiCpuPkg/Library/SmmCpuFeaturesLib/Ia32/SmiException.nasm | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/UefiCpuPkg/Library/SmmCpuFeaturesLib/Ia32/SmiException.nasm b/UefiCpuPkg/Library/SmmCpuFeaturesLib/Ia32/SmiException.nasm new file mode 100644 index 0000000000..0ce8501ba9 --- /dev/null +++ b/UefiCpuPkg/Library/SmmCpuFeaturesLib/Ia32/SmiException.nasm @@ -0,0 +1,176 @@ +;------------------------------------------------------------------------------ ;
+; Copyright (c) 2009 - 2016, 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:
+;
+; SmiException.nasm
+;
+; Abstract:
+;
+; Exception handlers used in SM mode
+;
+;-------------------------------------------------------------------------------
+
+global ASM_PFX(gcStmPsd)
+
+extern ASM_PFX(SmmStmExceptionHandler)
+extern ASM_PFX(SmmStmSetup)
+extern ASM_PFX(SmmStmTeardown)
+extern ASM_PFX(gStmXdSupported)
+extern ASM_PFX(gStmSmiHandlerIdtr)
+
+%define MSR_IA32_MISC_ENABLE 0x1A0
+%define MSR_EFER 0xc0000080
+%define MSR_EFER_XD 0x800
+
+CODE_SEL equ 0x08
+DATA_SEL equ 0x20
+TSS_SEL equ 0x40
+
+ SECTION .data
+
+ASM_PFX(gcStmPsd):
+ DB 'TXTPSSIG'
+ DW PSD_SIZE
+ DW 1 ; Version
+ DD 0 ; LocalApicId
+ DB 0x05 ; Cr4Pse;Cr4Pae;Intel64Mode;ExecutionDisableOutsideSmrr
+ DB 0 ; BIOS to STM
+ DB 0 ; STM to BIOS
+ DB 0
+ DW CODE_SEL
+ DW DATA_SEL
+ DW DATA_SEL
+ DW DATA_SEL
+ DW TSS_SEL
+ DW 0
+ DQ 0 ; SmmCr3
+ DD ASM_PFX(OnStmSetup)
+ DD 0
+ DD ASM_PFX(OnStmTeardown)
+ DD 0
+ DQ 0 ; SmmSmiHandlerRip - SMM guest entrypoint
+ DQ 0 ; SmmSmiHandlerRsp
+ DQ 0
+ DD 0
+ DD 0x80010100 ; RequiredStmSmmRevId
+ DD ASM_PFX(OnException)
+ DD 0
+ DQ 0 ; ExceptionStack
+ DW DATA_SEL
+ DW 0x01F ; ExceptionFilter
+ DD 0
+ DD 0
+ DD 0
+ DQ 0 ; BiosHwResourceRequirementsPtr
+ DQ 0 ; AcpiRsdp
+ DB 0 ; PhysicalAddressBits
+PSD_SIZE equ $ - ASM_PFX(gcStmPsd)
+
+ SECTION .text
+;------------------------------------------------------------------------------
+; SMM Exception handlers
+;------------------------------------------------------------------------------
+global ASM_PFX(OnException)
+ASM_PFX(OnException):
+ mov ecx, esp
+ push ecx
+ call ASM_PFX(SmmStmExceptionHandler)
+ add esp, 4
+
+ mov ebx, eax
+ mov eax, 4
+ DB 0x0f, 0x01, 0x0c1 ; VMCALL
+ jmp $
+
+global ASM_PFX(OnStmSetup)
+ASM_PFX(OnStmSetup):
+;
+; Check XD disable bit
+;
+ xor esi, esi
+ mov eax, ASM_PFX(gStmXdSupported)
+ mov al, [eax]
+ cmp al, 0
+ jz @StmXdDone1
+ mov ecx, MSR_IA32_MISC_ENABLE
+ rdmsr
+ mov esi, edx ; save MSR_IA32_MISC_ENABLE[63-32]
+ test edx, BIT2 ; MSR_IA32_MISC_ENABLE[34]
+ jz .51
+ and dx, 0xFFFB ; clear XD Disable bit if it is set
+ wrmsr
+.51:
+ mov ecx, MSR_EFER
+ rdmsr
+ or ax, MSR_EFER_XD ; enable NXE
+ wrmsr
+@StmXdDone1:
+ push esi
+
+ call ASM_PFX(SmmStmSetup)
+
+ mov eax, ASM_PFX(gStmXdSupported)
+ mov al, [eax]
+ cmp al, 0
+ jz .71
+ pop edx ; get saved MSR_IA32_MISC_ENABLE[63-32]
+ test edx, BIT2
+ jz .71
+ mov ecx, MSR_IA32_MISC_ENABLE
+ rdmsr
+ or dx, BIT2 ; set XD Disable bit if it was set before entering into SMM
+ wrmsr
+
+.71:
+ rsm
+
+global ASM_PFX(OnStmTeardown)
+ASM_PFX(OnStmTeardown):
+;
+; Check XD disable bit
+;
+ xor esi, esi
+ mov eax, ASM_PFX(gStmXdSupported)
+ mov al, [eax]
+ cmp al, 0
+ jz @StmXdDone2
+ mov ecx, MSR_IA32_MISC_ENABLE
+ rdmsr
+ mov esi, edx ; save MSR_IA32_MISC_ENABLE[63-32]
+ test edx, BIT2 ; MSR_IA32_MISC_ENABLE[34]
+ jz .52
+ and dx, 0xFFFB ; clear XD Disable bit if it is set
+ wrmsr
+.52:
+ mov ecx, MSR_EFER
+ rdmsr
+ or ax, MSR_EFER_XD ; enable NXE
+ wrmsr
+@StmXdDone2:
+ push esi
+
+ call ASM_PFX(SmmStmTeardown)
+
+ mov eax, ASM_PFX(gStmXdSupported)
+ mov al, [eax]
+ cmp al, 0
+ jz .72
+ pop edx ; get saved MSR_IA32_MISC_ENABLE[63-32]
+ test edx, BIT2
+ jz .72
+ mov ecx, MSR_IA32_MISC_ENABLE
+ rdmsr
+ or dx, BIT2 ; set XD Disable bit if it was set before entering into SMM
+ wrmsr
+
+.72:
+ rsm
+
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