299 lines
7.6 KiB
NASM
299 lines
7.6 KiB
NASM
;------------------------------------------------------------------------------ ;
|
|
; Copyright (c) 2016 - 2019, Intel Corporation. All rights reserved.<BR>
|
|
; SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
;
|
|
; Module Name:
|
|
;
|
|
; SmiEntry.nasm
|
|
;
|
|
; Abstract:
|
|
;
|
|
; Code template of the SMI handler for a particular processor
|
|
;
|
|
;-------------------------------------------------------------------------------
|
|
|
|
%include "StuffRsbNasm.inc"
|
|
%include "Nasm.inc"
|
|
|
|
%define MSR_IA32_S_CET 0x6A2
|
|
%define MSR_IA32_CET_SH_STK_EN 0x1
|
|
%define MSR_IA32_CET_WR_SHSTK_EN 0x2
|
|
%define MSR_IA32_CET_ENDBR_EN 0x4
|
|
%define MSR_IA32_CET_LEG_IW_EN 0x8
|
|
%define MSR_IA32_CET_NO_TRACK_EN 0x10
|
|
%define MSR_IA32_CET_SUPPRESS_DIS 0x20
|
|
%define MSR_IA32_CET_SUPPRESS 0x400
|
|
%define MSR_IA32_CET_TRACKER 0x800
|
|
%define MSR_IA32_PL0_SSP 0x6A4
|
|
|
|
%define CR4_CET 0x800000
|
|
|
|
%define MSR_IA32_MISC_ENABLE 0x1A0
|
|
%define MSR_EFER 0xc0000080
|
|
%define MSR_EFER_XD 0x800
|
|
|
|
;
|
|
; Constants relating to PROCESSOR_SMM_DESCRIPTOR
|
|
;
|
|
%define DSC_OFFSET 0xfb00
|
|
%define DSC_GDTPTR 0x30
|
|
%define DSC_GDTSIZ 0x38
|
|
%define DSC_CS 14
|
|
%define DSC_DS 16
|
|
%define DSC_SS 18
|
|
%define DSC_OTHERSEG 20
|
|
|
|
%define PROTECT_MODE_CS 0x8
|
|
%define PROTECT_MODE_DS 0x20
|
|
%define TSS_SEGMENT 0x40
|
|
|
|
extern ASM_PFX(SmiRendezvous)
|
|
extern ASM_PFX(FeaturePcdGet (PcdCpuSmmStackGuard))
|
|
extern ASM_PFX(CpuSmmDebugEntry)
|
|
extern ASM_PFX(CpuSmmDebugExit)
|
|
|
|
global ASM_PFX(gcSmiHandlerTemplate)
|
|
global ASM_PFX(gcSmiHandlerSize)
|
|
global ASM_PFX(gPatchSmiCr3)
|
|
global ASM_PFX(gPatchSmiStack)
|
|
global ASM_PFX(gPatchSmbase)
|
|
extern ASM_PFX(mXdSupported)
|
|
global ASM_PFX(gPatchXdSupported)
|
|
extern ASM_PFX(gSmiHandlerIdtr)
|
|
|
|
extern ASM_PFX(mCetSupported)
|
|
global ASM_PFX(mPatchCetSupported)
|
|
global ASM_PFX(mPatchCetPl0Ssp)
|
|
global ASM_PFX(mPatchCetInterruptSsp)
|
|
|
|
SECTION .text
|
|
|
|
BITS 16
|
|
ASM_PFX(gcSmiHandlerTemplate):
|
|
_SmiEntryPoint:
|
|
mov bx, _GdtDesc - _SmiEntryPoint + 0x8000
|
|
mov ax,[cs:DSC_OFFSET + DSC_GDTSIZ]
|
|
dec ax
|
|
mov [cs:bx], ax
|
|
mov eax, [cs:DSC_OFFSET + DSC_GDTPTR]
|
|
mov [cs:bx + 2], eax
|
|
mov ebp, eax ; ebp = GDT base
|
|
o32 lgdt [cs:bx] ; lgdt fword ptr cs:[bx]
|
|
mov ax, PROTECT_MODE_CS
|
|
mov [cs:bx-0x2],ax
|
|
mov edi, strict dword 0 ; source operand will be patched
|
|
ASM_PFX(gPatchSmbase):
|
|
lea eax, [edi + (@32bit - _SmiEntryPoint) + 0x8000]
|
|
mov [cs:bx-0x6],eax
|
|
mov ebx, cr0
|
|
and ebx, 0x9ffafff3
|
|
or ebx, 0x23
|
|
mov cr0, ebx
|
|
jmp dword 0x0:0x0
|
|
_GdtDesc:
|
|
DW 0
|
|
DD 0
|
|
|
|
BITS 32
|
|
@32bit:
|
|
mov ax, PROTECT_MODE_DS
|
|
o16 mov ds, ax
|
|
o16 mov es, ax
|
|
o16 mov fs, ax
|
|
o16 mov gs, ax
|
|
o16 mov ss, ax
|
|
mov esp, strict dword 0 ; source operand will be patched
|
|
ASM_PFX(gPatchSmiStack):
|
|
mov eax, ASM_PFX(gSmiHandlerIdtr)
|
|
lidt [eax]
|
|
jmp ProtFlatMode
|
|
|
|
ProtFlatMode:
|
|
mov eax, strict dword 0 ; source operand will be patched
|
|
ASM_PFX(gPatchSmiCr3):
|
|
mov cr3, eax
|
|
;
|
|
; Need to test for CR4 specific bit support
|
|
;
|
|
mov eax, 1
|
|
cpuid ; use CPUID to determine if specific CR4 bits are supported
|
|
xor eax, eax ; Clear EAX
|
|
test edx, BIT2 ; Check for DE capabilities
|
|
jz .0
|
|
or eax, BIT3
|
|
.0:
|
|
test edx, BIT6 ; Check for PAE capabilities
|
|
jz .1
|
|
or eax, BIT5
|
|
.1:
|
|
test edx, BIT7 ; Check for MCE capabilities
|
|
jz .2
|
|
or eax, BIT6
|
|
.2:
|
|
test edx, BIT24 ; Check for FXSR capabilities
|
|
jz .3
|
|
or eax, BIT9
|
|
.3:
|
|
test edx, BIT25 ; Check for SSE capabilities
|
|
jz .4
|
|
or eax, BIT10
|
|
.4: ; as cr4.PGE is not set here, refresh cr3
|
|
mov cr4, eax ; in PreModifyMtrrs() to flush TLB.
|
|
|
|
cmp byte [dword ASM_PFX(FeaturePcdGet (PcdCpuSmmStackGuard))], 0
|
|
jz .6
|
|
; Load TSS
|
|
mov byte [ebp + TSS_SEGMENT + 5], 0x89 ; clear busy flag
|
|
mov eax, TSS_SEGMENT
|
|
ltr ax
|
|
.6:
|
|
|
|
; enable NXE if supported
|
|
mov al, strict byte 1 ; source operand may be patched
|
|
ASM_PFX(gPatchXdSupported):
|
|
cmp al, 0
|
|
jz @SkipXd
|
|
;
|
|
; Check XD disable bit
|
|
;
|
|
mov ecx, MSR_IA32_MISC_ENABLE
|
|
rdmsr
|
|
push edx ; save MSR_IA32_MISC_ENABLE[63-32]
|
|
test edx, BIT2 ; MSR_IA32_MISC_ENABLE[34]
|
|
jz .5
|
|
and dx, 0xFFFB ; clear XD Disable bit if it is set
|
|
wrmsr
|
|
.5:
|
|
mov ecx, MSR_EFER
|
|
rdmsr
|
|
or ax, MSR_EFER_XD ; enable NXE
|
|
wrmsr
|
|
jmp @XdDone
|
|
@SkipXd:
|
|
sub esp, 4
|
|
@XdDone:
|
|
|
|
mov ebx, cr0
|
|
or ebx, 0x80010023 ; enable paging + WP + NE + MP + PE
|
|
mov cr0, ebx
|
|
lea ebx, [edi + DSC_OFFSET]
|
|
mov ax, [ebx + DSC_DS]
|
|
mov ds, eax
|
|
mov ax, [ebx + DSC_OTHERSEG]
|
|
mov es, eax
|
|
mov fs, eax
|
|
mov gs, eax
|
|
mov ax, [ebx + DSC_SS]
|
|
mov ss, eax
|
|
|
|
mov ebx, [esp + 4] ; ebx <- CpuIndex
|
|
|
|
; enable CET if supported
|
|
mov al, strict byte 1 ; source operand may be patched
|
|
ASM_PFX(mPatchCetSupported):
|
|
cmp al, 0
|
|
jz CetDone
|
|
|
|
mov ecx, MSR_IA32_S_CET
|
|
rdmsr
|
|
push edx
|
|
push eax
|
|
|
|
mov ecx, MSR_IA32_PL0_SSP
|
|
rdmsr
|
|
push edx
|
|
push eax
|
|
|
|
mov ecx, MSR_IA32_S_CET
|
|
mov eax, MSR_IA32_CET_SH_STK_EN
|
|
xor edx, edx
|
|
wrmsr
|
|
|
|
mov ecx, MSR_IA32_PL0_SSP
|
|
mov eax, strict dword 0 ; source operand will be patched
|
|
ASM_PFX(mPatchCetPl0Ssp):
|
|
xor edx, edx
|
|
wrmsr
|
|
mov ecx, cr0
|
|
btr ecx, 16 ; clear WP
|
|
mov cr0, ecx
|
|
mov [eax], eax ; reload SSP, and clear busyflag.
|
|
xor ecx, ecx
|
|
mov [eax + 4], ecx
|
|
|
|
mov eax, strict dword 0 ; source operand will be patched
|
|
ASM_PFX(mPatchCetInterruptSsp):
|
|
cmp eax, 0
|
|
jz CetInterruptDone
|
|
mov [eax], eax ; reload SSP, and clear busyflag.
|
|
xor ecx, ecx
|
|
mov [eax + 4], ecx
|
|
CetInterruptDone:
|
|
|
|
mov ecx, cr0
|
|
bts ecx, 16 ; set WP
|
|
mov cr0, ecx
|
|
|
|
mov eax, 0x668 | CR4_CET
|
|
mov cr4, eax
|
|
|
|
SETSSBSY
|
|
|
|
CetDone:
|
|
|
|
push ebx
|
|
mov eax, ASM_PFX(CpuSmmDebugEntry)
|
|
call eax
|
|
add esp, 4
|
|
|
|
push ebx
|
|
mov eax, ASM_PFX(SmiRendezvous)
|
|
call eax
|
|
add esp, 4
|
|
|
|
push ebx
|
|
mov eax, ASM_PFX(CpuSmmDebugExit)
|
|
call eax
|
|
add esp, 4
|
|
|
|
mov eax, ASM_PFX(mCetSupported)
|
|
mov al, [eax]
|
|
cmp al, 0
|
|
jz CetDone2
|
|
|
|
mov eax, 0x668
|
|
mov cr4, eax ; disable CET
|
|
|
|
mov ecx, MSR_IA32_PL0_SSP
|
|
pop eax
|
|
pop edx
|
|
wrmsr
|
|
|
|
mov ecx, MSR_IA32_S_CET
|
|
pop eax
|
|
pop edx
|
|
wrmsr
|
|
CetDone2:
|
|
|
|
mov eax, ASM_PFX(mXdSupported)
|
|
mov al, [eax]
|
|
cmp al, 0
|
|
jz .7
|
|
pop edx ; get saved MSR_IA32_MISC_ENABLE[63-32]
|
|
test edx, BIT2
|
|
jz .7
|
|
mov ecx, MSR_IA32_MISC_ENABLE
|
|
rdmsr
|
|
or dx, BIT2 ; set XD Disable bit if it was set before entering into SMM
|
|
wrmsr
|
|
|
|
.7:
|
|
|
|
StuffRsb32
|
|
rsm
|
|
|
|
ASM_PFX(gcSmiHandlerSize): DW $ - _SmiEntryPoint
|
|
|
|
global ASM_PFX(PiSmmCpuSmiEntryFixupAddress)
|
|
ASM_PFX(PiSmmCpuSmiEntryFixupAddress):
|
|
ret
|