AsmRelocateApLoop is replicated for future Intel Logic Extraction,
further brings AP into 64-bit, and enables paging.
Signed-off-by: Yuanhao Xie <yuanhao....@intel.com>
---
UefiCpuPkg/Library/MpInitLib/DxeMpLib.c | 52 +++---
UefiCpuPkg/Library/MpInitLib/MpEqu.inc | 2 +
UefiCpuPkg/Library/MpInitLib/MpLib.h | 27 +++
UefiCpuPkg/Library/MpInitLib/X64/AmdSev.nasm | 169 ++++++++++++++++++
UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm | 5 +
5 files changed, 235 insertions(+), 20 deletions(-)
diff --git a/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
b/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
index a84e9e33ba..445e0853d2 100644
--- a/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
@@ -1,7 +1,7 @@
/** @file
MP initialize support functions for DXE phase.
- Copyright (c) 2016 - 2020, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2016 - 2022, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
@@ -378,32 +378,44 @@ RelocateApLoop (
IN OUT VOID *Buffer
)
{
- CPU_MP_DATA *CpuMpData;
- BOOLEAN MwaitSupport;
- ASM_RELOCATE_AP_LOOP AsmRelocateApLoopFunc;
- UINTN ProcessorNumber;
- UINTN StackStart;
+ CPU_MP_DATA *CpuMpData;
+ BOOLEAN MwaitSupport;
+ ASM_RELOCATE_AP_LOOP AsmRelocateApLoopFunc;
+ ASM_RELOCATE_AP_LOOP_AMD AsmRelocateApLoopFuncAmd;
+ UINTN ProcessorNumber;
+ UINTN StackStart;
MpInitLibWhoAmI (&ProcessorNumber);
CpuMpData = GetCpuMpData ();
MwaitSupport = IsMwaitSupport ();
- if (CpuMpData->UseSevEsAPMethod) {
- StackStart = CpuMpData->SevEsAPResetStackStart;
+ if (StandardSignatureIsAuthenticAMD ()) {
+ StackStart = CpuMpData->UseSevEsAPMethod ?
CpuMpData->SevEsAPResetStackStart : mReservedTopOfApStack;
+ AsmRelocateApLoopFuncAmd =
(ASM_RELOCATE_AP_LOOP_AMD)(UINTN)mReservedApLoopFunc;
+ AsmRelocateApLoopFuncAmd (
+ MwaitSupport,
+ CpuMpData->ApTargetCState,
+ CpuMpData->PmCodeSegment,
+ StackStart - ProcessorNumber * AP_SAFE_STACK_SIZE,
+ (UINTN)&mNumberToFinish,
+ CpuMpData->Pm16CodeSegment,
+ CpuMpData->SevEsAPBuffer,
+ CpuMpData->WakeupBuffer
+ );
} else {
- StackStart = mReservedTopOfApStack;
+ StackStart = mReservedTopOfApStack;
+ AsmRelocateApLoopFunc = (ASM_RELOCATE_AP_LOOP)(UINTN)mReservedApLoopFunc;
+ AsmRelocateApLoopFunc (
+ MwaitSupport,
+ CpuMpData->ApTargetCState,
+ CpuMpData->PmCodeSegment,
+ StackStart - ProcessorNumber * AP_SAFE_STACK_SIZE,
+ (UINTN)&mNumberToFinish,
+ CpuMpData->Pm16CodeSegment,
+ CpuMpData->SevEsAPBuffer,
+ CpuMpData->WakeupBuffer
+ );
}
- AsmRelocateApLoopFunc = (ASM_RELOCATE_AP_LOOP)(UINTN)mReservedApLoopFunc;
- AsmRelocateApLoopFunc (
- MwaitSupport,
- CpuMpData->ApTargetCState,
- CpuMpData->PmCodeSegment,
- StackStart - ProcessorNumber * AP_SAFE_STACK_SIZE,
- (UINTN)&mNumberToFinish,
- CpuMpData->Pm16CodeSegment,
- CpuMpData->SevEsAPBuffer,
- CpuMpData->WakeupBuffer
- );
//
// It should never reach here
//
diff --git a/UefiCpuPkg/Library/MpInitLib/MpEqu.inc
b/UefiCpuPkg/Library/MpInitLib/MpEqu.inc
index ebadcc6fb3..ea202d4aef 100644
--- a/UefiCpuPkg/Library/MpInitLib/MpEqu.inc
+++ b/UefiCpuPkg/Library/MpInitLib/MpEqu.inc
@@ -26,6 +26,8 @@ struc MP_ASSEMBLY_ADDRESS_MAP
.RendezvousFunnelSize CTYPE_UINTN 1
.RelocateApLoopFuncAddress CTYPE_UINTN 1
.RelocateApLoopFuncSize CTYPE_UINTN 1
+ .RelocateApLoopFuncAddressAmd CTYPE_UINTN 1
+ .RelocateApLoopFuncSizeAmd CTYPE_UINTN 1
.ModeTransitionOffset CTYPE_UINTN 1
.SwitchToRealNoNxOffset CTYPE_UINTN 1
.SwitchToRealPM16ModeOffset CTYPE_UINTN 1
diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.h
b/UefiCpuPkg/Library/MpInitLib/MpLib.h
index f5086e497e..1102003a93 100644
--- a/UefiCpuPkg/Library/MpInitLib/MpLib.h
+++ b/UefiCpuPkg/Library/MpInitLib/MpLib.h
@@ -179,6 +179,8 @@ typedef struct {
UINTN RendezvousFunnelSize;
UINT8 *RelocateApLoopFuncAddress;
UINTN RelocateApLoopFuncSize;
+ UINT8 *RelocateApLoopFuncAddressAmd;
+ UINTN RelocateApLoopFuncSizeAmd;
UINTN ModeTransitionOffset;
UINTN SwitchToRealNoNxOffset;
UINTN SwitchToRealPM16ModeOffset;
@@ -346,6 +348,31 @@ typedef
extern EFI_GUID mCpuInitMpLibHobGuid;
+/**
+ Assembly code to place AP into safe loop mode for Amd.
+ Place AP into targeted C-State if MONITOR is supported, otherwise
+ place AP into hlt state.
+ Place AP in protected mode if the current is long mode. Due to AP maybe
+ wakeup by some hardware event. It could avoid accessing page table that
+ may not available during booting to OS.
+ @param[in] MwaitSupport TRUE indicates MONITOR is supported.
+ FALSE indicates MONITOR is not supported.
+ @param[in] ApTargetCState Target C-State value.
+ @param[in] PmCodeSegment Protected mode code segment value.
+**/
+typedef
+ VOID
+(EFIAPI *ASM_RELOCATE_AP_LOOP_AMD)(
+ IN BOOLEAN MwaitSupport,
+ IN UINTN ApTargetCState,
+ IN UINTN PmCodeSegment,
+ IN UINTN TopOfApStack,
+ IN UINTN NumberToFinish,
+ IN UINTN Pm16CodeSegment,
+ IN UINTN SevEsAPJumpTable,
+ IN UINTN WakeupBuffer
+ );
+
/**
Assembly code to place AP into safe loop mode.
diff --git a/UefiCpuPkg/Library/MpInitLib/X64/AmdSev.nasm
b/UefiCpuPkg/Library/MpInitLib/X64/AmdSev.nasm
index 7c2469f9c5..b2d95adf6d 100644
--- a/UefiCpuPkg/Library/MpInitLib/X64/AmdSev.nasm
+++ b/UefiCpuPkg/Library/MpInitLib/X64/AmdSev.nasm
@@ -346,3 +346,172 @@ PM16Mode:
iret
SwitchToRealProcEnd:
+;-------------------------------------------------------------------------------------
+; AsmRelocateApLoopAmd (MwaitSupport, ApTargetCState, PmCodeSegment,
TopOfApStack, CountTofinish, Pm16CodeSegment, SevEsAPJumpTable, WakeupBuffer);
+;-------------------------------------------------------------------------------------
+
+AsmRelocateApLoopStartAmd:
+BITS 64
+ cmp qword [rsp + 56], 0 ; SevEsAPJumpTable
+ je NoSevEsAmd
+
+ ;
+ ; Perform some SEV-ES related setup before leaving 64-bit mode
+ ;
+ push rcx
+ push rdx
+
+ ;
+ ; Get the RDX reset value using CPUID
+ ;
+ mov rax, 1
+ cpuid
+ mov rsi, rax ; Save off the reset value for RDX
+
+ ;
+ ; Prepare the GHCB for the AP_HLT_LOOP VMGEXIT call
+ ; - Must be done while in 64-bit long mode so that writes to
+ ; the GHCB memory will be unencrypted.
+ ; - No NAE events can be generated once this is set otherwise
+ ; the AP_RESET_HOLD SW_EXITCODE will be overwritten.
+ ;
+ mov rcx, 0xc0010130
+ rdmsr ; Retrieve current GHCB address
+ shl rdx, 32
+ or rdx, rax
+
+ mov rdi, rdx
+ xor rax, rax
+ mov rcx, 0x800
+ shr rcx, 3
+ rep stosq ; Clear the GHCB
+
+ mov rax, 0x80000004 ; VMGEXIT AP_RESET_HOLD
+ mov [rdx + 0x390], rax
+ mov rax, 114 ; Set SwExitCode valid bit
+ bts [rdx + 0x3f0], rax
+ inc rax ; Set SwExitInfo1 valid bit
+ bts [rdx + 0x3f0], rax
+ inc rax ; Set SwExitInfo2 valid bit
+ bts [rdx + 0x3f0], rax
+
+ pop rdx
+ pop rcx
+
+NoSevEsAmd:
+ cli ; Disable interrupt before switching to
32-bit mode
+ mov rax, [rsp + 40] ; CountTofinish
+ lock dec dword [rax] ; (*CountTofinish)--
+
+ mov r10, [rsp + 48] ; Pm16CodeSegment
+ mov rax, [rsp + 56] ; SevEsAPJumpTable
+ mov rbx, [rsp + 64] ; WakeupBuffer
+ mov rsp, r9 ; TopOfApStack
+
+ push rax ; Save SevEsAPJumpTable
+ push rbx ; Save WakeupBuffer
+ push r10 ; Save Pm16CodeSegment
+ push rcx ; Save MwaitSupport
+ push rdx ; Save ApTargetCState
+
+ lea rax, [PmEntryAmd] ; rax <- The start address of transition
code
+
+ push r8
+ push rax
+
+ ;
+ ; Clear R8 - R15, for reset, before going into 32-bit mode
+ ;
+ xor r8, r8
+ xor r9, r9
+ xor r10, r10
+ xor r11, r11
+ xor r12, r12
+ xor r13, r13
+ xor r14, r14
+ xor r15, r15
+
+ ;
+ ; Far return into 32-bit mode
+ ;
+o64 retf
+
+BITS 32
+PmEntryAmd:
+ mov eax, cr0
+ btr eax, 31 ; Clear CR0.PG
+ mov cr0, eax ; Disable paging and caches
+
+ mov ecx, 0xc0000080
+ rdmsr
+ and ah, ~ 1 ; Clear LME
+ wrmsr
+ mov eax, cr4
+ and al, ~ (1 << 5) ; Clear PAE
+ mov cr4, eax
+
+ pop edx
+ add esp, 4
+ pop ecx,
+ add esp, 4
+
+MwaitCheckAmd:
+ cmp cl, 1 ; Check mwait-monitor support
+ jnz HltLoopAmd
+ mov ebx, edx ; Save C-State to ebx
+MwaitLoopAmd:
+ cli
+ mov eax, esp ; Set Monitor Address
+ xor ecx, ecx ; ecx = 0
+ xor edx, edx ; edx = 0
+ monitor
+ mov eax, ebx ; Mwait Cx, Target C-State per eax[7:4]
+ shl eax, 4
+ mwait
+ jmp MwaitLoopAmd
+
+HltLoopAmd:
+ pop edx ; PM16CodeSegment
+ add esp, 4
+ pop ebx ; WakeupBuffer
+ add esp, 4
+ pop eax ; SevEsAPJumpTable
+ add esp, 4
+ cmp eax, 0 ; Check for SEV-ES
+ je DoHltAmd
+
+ cli
+ ;
+ ; SEV-ES is enabled, use VMGEXIT (GHCB information already
+ ; set by caller)
+ ;
+BITS 64
+ rep vmmcall
+BITS 32
+
+ ;
+ ; Back from VMGEXIT AP_HLT_LOOP
+ ; Push the FLAGS/CS/IP values to use
+ ;
+ push word 0x0002 ; EFLAGS
+ xor ecx, ecx
+ mov cx, [eax + 2] ; CS
+ push cx
+ mov cx, [eax] ; IP
+ push cx
+ push word 0x0000 ; For alignment, will be discarded
+
+ push edx
+ push ebx
+
+ mov edx, esi ; Restore RDX reset value
+
+ retf
+
+DoHltAmd:
+ cli
+ hlt
+ jmp DoHltAmd
+
+BITS 64
+AsmRelocateApLoopEndAmd:
diff --git a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
index 5d71995bf8..39c3e8606a 100644
--- a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
+++ b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
@@ -460,6 +460,11 @@ ASM_PFX(AsmGetAddressMap):
mov qword [rcx +
MP_ASSEMBLY_ADDRESS_MAP.RelocateApLoopFuncAddress], rax
mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.RelocateApLoopFuncSize],
AsmRelocateApLoopEnd - AsmRelocateApLoopStart
mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.ModeTransitionOffset],
Flat32Start - RendezvousFunnelProcStart
+
+ lea rax, [AsmRelocateApLoopStartAmd]
+ mov qword [rcx +
MP_ASSEMBLY_ADDRESS_MAP.RelocateApLoopFuncAddressAmd], rax
+ mov qword [rcx +
MP_ASSEMBLY_ADDRESS_MAP.RelocateApLoopFuncSizeAmd], AsmRelocateApLoopEndAmd -
AsmRelocateApLoopStartAmd
+
mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.SwitchToRealNoNxOffset],
SwitchToRealProcStart - Flat32Start
mov qword [rcx +
MP_ASSEMBLY_ADDRESS_MAP.SwitchToRealPM16ModeOffset], PM16Mode -
RendezvousFunnelProcStart
mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.SwitchToRealPM16ModeSize],
SwitchToRealProcEnd - PM16Mode
--
2.36.1.windows.1
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