1c7a65eba7
https://bugzilla.tianocore.org/show_bug.cgi?id=849 In V2, use "mov rax, strict qword 0" to replace the hard code db. 1. Use lea instruction to get the address instead of mov instruction. 2. Use the dummy address as jmp destination, and add the logic to fix up the address to the absolute address at boot time. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Liming Gao <liming.gao@intel.com> Cc: Andrew Fish <afish@apple.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Eric Dong <eric.dong@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Michael Kinney <michael.d.kinney@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
179 lines
5.2 KiB
NASM
179 lines
5.2 KiB
NASM
;------------------------------------------------------------------------------ ;
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; Copyright (c) 2016 - 2018, 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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; SmiException.nasm
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;
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; Abstract:
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;
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; Exception handlers used in SM mode
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;
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;-------------------------------------------------------------------------------
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global ASM_PFX(gcStmPsd)
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extern ASM_PFX(SmmStmExceptionHandler)
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extern ASM_PFX(SmmStmSetup)
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extern ASM_PFX(SmmStmTeardown)
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extern ASM_PFX(gStmXdSupported)
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extern ASM_PFX(gStmSmiHandlerIdtr)
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%define MSR_IA32_MISC_ENABLE 0x1A0
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%define MSR_EFER 0xc0000080
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%define MSR_EFER_XD 0x800
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CODE_SEL equ 0x38
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DATA_SEL equ 0x20
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TR_SEL equ 0x40
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SECTION .data
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;
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; This structure serves as a template for all processors.
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;
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ASM_PFX(gcStmPsd):
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DB 'TXTPSSIG'
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DW PSD_SIZE
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DW 1 ; Version
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DD 0 ; LocalApicId
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DB 0x0F ; Cr4Pse;Cr4Pae;Intel64Mode;ExecutionDisableOutsideSmrr
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DB 0 ; BIOS to STM
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DB 0 ; STM to BIOS
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DB 0
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DW CODE_SEL
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DW DATA_SEL
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DW DATA_SEL
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DW DATA_SEL
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DW TR_SEL
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DW 0
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DQ 0 ; SmmCr3
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DQ ASM_PFX(OnStmSetup)
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DQ ASM_PFX(OnStmTeardown)
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DQ 0 ; SmmSmiHandlerRip - SMM guest entrypoint
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DQ 0 ; SmmSmiHandlerRsp
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DQ 0
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DD 0
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DD 0x80010100 ; RequiredStmSmmRevId
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DQ ASM_PFX(OnException)
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DQ 0 ; ExceptionStack
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DW DATA_SEL
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DW 0x01F ; ExceptionFilter
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DD 0
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DQ 0
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DQ 0 ; BiosHwResourceRequirementsPtr
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DQ 0 ; AcpiRsdp
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DB 0 ; PhysicalAddressBits
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PSD_SIZE equ $ - ASM_PFX(gcStmPsd)
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DEFAULT REL
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SECTION .text
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;------------------------------------------------------------------------------
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; SMM Exception handlers
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;------------------------------------------------------------------------------
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global ASM_PFX(OnException)
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ASM_PFX(OnException):
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mov rcx, rsp
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add rsp, -0x28
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call ASM_PFX(SmmStmExceptionHandler)
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add rsp, 0x28
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mov ebx, eax
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mov eax, 4
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vmcall
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jmp $
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global ASM_PFX(OnStmSetup)
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ASM_PFX(OnStmSetup):
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;
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; Check XD disable bit
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;
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xor r8, r8
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lea rax, [ASM_PFX(gStmXdSupported)]
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mov al, [rax]
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cmp al, 0
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jz @StmXdDone1
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mov ecx, MSR_IA32_MISC_ENABLE
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rdmsr
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mov r8, rdx ; save MSR_IA32_MISC_ENABLE[63-32]
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test edx, BIT2 ; MSR_IA32_MISC_ENABLE[34]
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jz .01
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and dx, 0xFFFB ; clear XD Disable bit if it is set
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wrmsr
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.01:
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mov ecx, MSR_EFER
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rdmsr
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or ax, MSR_EFER_XD ; enable NXE
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wrmsr
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@StmXdDone1:
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push r8
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add rsp, -0x20
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call ASM_PFX(SmmStmSetup)
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add rsp, 0x20
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lea rax, [ASM_PFX(gStmXdSupported)]
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mov al, [rax]
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cmp al, 0
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jz .11
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pop rdx ; get saved MSR_IA32_MISC_ENABLE[63-32]
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test edx, BIT2
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jz .11
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mov ecx, MSR_IA32_MISC_ENABLE
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rdmsr
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or dx, BIT2 ; set XD Disable bit if it was set before entering into SMM
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wrmsr
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.11:
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rsm
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global ASM_PFX(OnStmTeardown)
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ASM_PFX(OnStmTeardown):
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;
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; Check XD disable bit
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;
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xor r8, r8
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lea rax, [ASM_PFX(gStmXdSupported)]
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mov al, [rax]
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cmp al, 0
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jz @StmXdDone2
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mov ecx, MSR_IA32_MISC_ENABLE
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rdmsr
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mov r8, rdx ; save MSR_IA32_MISC_ENABLE[63-32]
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test edx, BIT2 ; MSR_IA32_MISC_ENABLE[34]
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jz .02
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and dx, 0xFFFB ; clear XD Disable bit if it is set
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wrmsr
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.02:
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mov ecx, MSR_EFER
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rdmsr
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or ax, MSR_EFER_XD ; enable NXE
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wrmsr
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@StmXdDone2:
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push r8
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add rsp, -0x20
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call ASM_PFX(SmmStmTeardown)
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add rsp, 0x20
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lea rax, [ASM_PFX(gStmXdSupported)]
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mov al, [rax]
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cmp al, 0
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jz .12
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pop rdx ; get saved MSR_IA32_MISC_ENABLE[63-32]
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test edx, BIT2
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jz .12
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mov ecx, MSR_IA32_MISC_ENABLE
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rdmsr
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or dx, BIT2 ; set XD Disable bit if it was set before entering into SMM
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wrmsr
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.12:
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rsm
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