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audk/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm

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NASM
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;------------------------------------------------------------------------------ ;
; Copyright (c) 2015 - 2022, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
;
; MpFuncs.nasm
;
; Abstract:
;
; This is the assembly code for MP support
;
;-------------------------------------------------------------------------------
%include "MpEqu.inc"
extern ASM_PFX(InitializeFloatingPointUnits)
%macro OneTimeCall 1
jmp %1
%1 %+ OneTimerCallReturn:
%endmacro
%macro OneTimeCallRet 1
jmp %1 %+ OneTimerCallReturn
%endmacro
DEFAULT REL
SECTION .text
;-------------------------------------------------------------------------------------
;RendezvousFunnelProc procedure follows. All APs execute their procedure. This
;procedure serializes all the AP processors through an Init sequence. It must be
;noted that APs arrive here very raw...ie: real mode, no stack.
;ALSO THIS PROCEDURE IS EXECUTED BY APs ONLY ON 16 BIT MODE. HENCE THIS PROC
;IS IN MACHINE CODE.
;-------------------------------------------------------------------------------------
RendezvousFunnelProcStart:
; At this point CS = 0x(vv00) and ip= 0x0.
; Save BIST information to ebp firstly
BITS 16
mov ebp, eax ; Save BIST information
mov ax, cs
mov ds, ax
mov es, ax
mov ss, ax
xor ax, ax
mov fs, ax
mov gs, ax
mov si, MP_CPU_EXCHANGE_INFO_FIELD (BufferStart)
mov ebx, [si]
mov si, MP_CPU_EXCHANGE_INFO_FIELD (DataSegment)
mov edx, [si]
;
; Get start address of 32-bit code in low memory (<1MB)
;
mov edi, MP_CPU_EXCHANGE_INFO_FIELD (ModeTransitionMemory)
mov si, MP_CPU_EXCHANGE_INFO_FIELD (GdtrProfile)
o32 lgdt [cs:si]
;
; Switch to protected mode
;
mov eax, cr0 ; Get control register 0
or eax, 000000003h ; Set PE bit (bit #0) & MP
mov cr0, eax
; Switch to 32-bit code (>1MB)
o32 jmp far [cs:di]
;
; Following code must be copied to memory with type of EfiBootServicesCode.
; This is required if NX is enabled for EfiBootServicesCode of memory.
;
BITS 32
Flat32Start: ; protected mode entry point
mov ds, dx
mov es, dx
mov fs, dx
mov gs, dx
mov ss, dx
;
; Enable execute disable bit
;
mov esi, MP_CPU_EXCHANGE_INFO_FIELD (EnableExecuteDisable)
cmp byte [ebx + esi], 0
jz SkipEnableExecuteDisableBit
mov ecx, 0c0000080h ; EFER MSR number
rdmsr ; Read EFER
bts eax, 11 ; Enable Execute Disable Bit
wrmsr ; Write EFER
SkipEnableExecuteDisableBit:
;
; Enable PAE
;
mov eax, cr4
bts eax, 5
mov esi, MP_CPU_EXCHANGE_INFO_FIELD (Enable5LevelPaging)
cmp byte [ebx + esi], 0
jz SkipEnable5LevelPaging
;
; Enable 5 Level Paging
;
bts eax, 12 ; Set LA57=1.
SkipEnable5LevelPaging:
mov cr4, eax
;
; Load page table
;
mov esi, MP_CPU_EXCHANGE_INFO_FIELD (Cr3) ; Save CR3 in ecx
mov ecx, [ebx + esi]
mov cr3, ecx ; Load CR3
;
; Enable long mode
;
mov ecx, 0c0000080h ; EFER MSR number
rdmsr ; Read EFER
bts eax, 8 ; Set LME=1
wrmsr ; Write EFER
;
; Enable paging
;
mov eax, cr0 ; Read CR0
bts eax, 31 ; Set PG=1
mov cr0, eax ; Write CR0
;
; Far jump to 64-bit code
;
mov edi, MP_CPU_EXCHANGE_INFO_FIELD (ModeHighMemory)
add edi, ebx
jmp far [edi]
BITS 64
LongModeStart:
mov esi, ebx
; Set IDT table at the start of 64 bit code
lea edi, [esi + MP_CPU_EXCHANGE_INFO_FIELD (IdtrProfile)]
lidt [edi]
lea edi, [esi + MP_CPU_EXCHANGE_INFO_FIELD (InitFlag)]
cmp qword [edi], 1 ; ApInitConfig
jnz GetApicId
; Increment the number of APs executing here as early as possible
; This is decremented in C code when AP is finished executing
mov edi, esi
add edi, MP_CPU_EXCHANGE_INFO_FIELD (NumApsExecuting)
lock inc dword [edi]
; AP init
mov edi, esi
add edi, MP_CPU_EXCHANGE_INFO_FIELD (ApIndex)
mov ebx, 1
lock xadd dword [edi], ebx ; EBX = ApIndex++
inc ebx ; EBX is CpuNumber
; program stack
mov edi, esi
add edi, MP_CPU_EXCHANGE_INFO_FIELD (StackSize)
mov eax, dword [edi]
mov ecx, ebx
inc ecx
mul ecx ; EAX = StackSize * (CpuNumber + 1)
mov edi, esi
add edi, MP_CPU_EXCHANGE_INFO_FIELD (StackStart)
add rax, qword [edi]
mov rsp, rax
;
; Setup the GHCB when AMD SEV-ES active.
;
OneTimeCall SevEsSetupGhcb
jmp CProcedureInvoke
GetApicId:
;
; Use the GHCB protocol to get the ApicId when SEV-ES is active.
;
OneTimeCall SevEsGetApicId
DoCpuid:
mov eax, 0
cpuid
cmp eax, 0bh
jb NoX2Apic ; CPUID level below CPUID_EXTENDED_TOPOLOGY
mov eax, 0bh
xor ecx, ecx
cpuid
test ebx, 0ffffh
jz NoX2Apic ; CPUID.0BH:EBX[15:0] is zero
; Processor is x2APIC capable; 32-bit x2APIC ID is already in EDX
jmp GetProcessorNumber
NoX2Apic:
; Processor is not x2APIC capable, so get 8-bit APIC ID
mov eax, 1
cpuid
shr ebx, 24
mov edx, ebx
GetProcessorNumber:
;
; Get processor number for this AP
; Note that BSP may become an AP due to SwitchBsp()
;
xor ebx, ebx
lea eax, [esi + MP_CPU_EXCHANGE_INFO_FIELD (CpuInfo)]
mov rdi, [eax]
GetNextProcNumber:
cmp dword [rdi + CPU_INFO_IN_HOB.InitialApicId], edx ; APIC ID match?
jz ProgramStack
add rdi, CPU_INFO_IN_HOB_size
inc ebx
jmp GetNextProcNumber
ProgramStack:
mov rsp, qword [rdi + CPU_INFO_IN_HOB.ApTopOfStack]
CProcedureInvoke:
push rbp ; Push BIST data at top of AP stack
xor rbp, rbp ; Clear ebp for call stack trace
push rbp
mov rbp, rsp
mov rax, qword [esi + MP_CPU_EXCHANGE_INFO_FIELD (InitializeFloatingPointUnits)]
sub rsp, 20h
call rax ; Call assembly function to initialize FPU per UEFI spec
add rsp, 20h
mov edx, ebx ; edx is ApIndex
mov ecx, esi
add ecx, MP_CPU_EXCHANGE_INFO_OFFSET ; rcx is address of exchange info data buffer
mov edi, esi
add edi, MP_CPU_EXCHANGE_INFO_FIELD (CFunction)
mov rax, qword [edi]
sub rsp, 20h
call rax ; Invoke C function
add rsp, 20h
jmp $ ; Should never reach here
;
; Required for the AMD SEV helper functions
;
%include "AmdSev.nasm"
RendezvousFunnelProcEnd:
;-------------------------------------------------------------------------------------
; AsmRelocateApLoop (MwaitSupport, ApTargetCState, PmCodeSegment, TopOfApStack, CountTofinish, Pm16CodeSegment, SevEsAPJumpTable, WakeupBuffer);
;-------------------------------------------------------------------------------------
AsmRelocateApLoopStart:
BITS 64
cmp qword [rsp + 56], 0 ; SevEsAPJumpTable
je NoSevEs
;
; 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
NoSevEs:
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, [PmEntry] ; 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
;
retfq
BITS 32
PmEntry:
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
MwaitCheck:
cmp cl, 1 ; Check mwait-monitor support
jnz HltLoop
mov ebx, edx ; Save C-State to ebx
MwaitLoop:
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 MwaitLoop
HltLoop:
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 DoHlt
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
DoHlt:
cli
hlt
jmp DoHlt
BITS 64
AsmRelocateApLoopEnd:
;-------------------------------------------------------------------------------------
; AsmGetAddressMap (&AddressMap);
;-------------------------------------------------------------------------------------
global ASM_PFX(AsmGetAddressMap)
ASM_PFX(AsmGetAddressMap):
lea rax, [RendezvousFunnelProcStart]
mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.RendezvousFunnelAddress], rax
mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.ModeEntryOffset], LongModeStart - RendezvousFunnelProcStart
mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.RendezvousFunnelSize], RendezvousFunnelProcEnd - RendezvousFunnelProcStart
lea rax, [AsmRelocateApLoopStart]
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
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
ret
;-------------------------------------------------------------------------------------
;AsmExchangeRole procedure follows. This procedure executed by current BSP, that is
;about to become an AP. It switches its stack with the current AP.
;AsmExchangeRole (IN CPU_EXCHANGE_INFO *MyInfo, IN CPU_EXCHANGE_INFO *OthersInfo);
;-------------------------------------------------------------------------------------
global ASM_PFX(AsmExchangeRole)
ASM_PFX(AsmExchangeRole):
; DO NOT call other functions in this function, since 2 CPU may use 1 stack
; at the same time. If 1 CPU try to call a function, stack will be corrupted.
push rax
push rbx
push rcx
push rdx
push rsi
push rdi
push rbp
push r8
push r9
push r10
push r11
push r12
push r13
push r14
push r15
; rsi contains MyInfo pointer
mov rsi, rcx
; rdi contains OthersInfo pointer
mov rdi, rdx
pushfq
; Store the its StackPointer
mov [rsi + CPU_EXCHANGE_ROLE_INFO.StackPointer], rsp
; update its switch state to STORED
mov byte [rsi + CPU_EXCHANGE_ROLE_INFO.State], CPU_SWITCH_STATE_STORED
WaitForOtherStored:
; wait until the other CPU finish storing its state
cmp byte [rdi + CPU_EXCHANGE_ROLE_INFO.State], CPU_SWITCH_STATE_STORED
jz OtherStored
pause
jmp WaitForOtherStored
OtherStored:
; load its future StackPointer
mov rsp, [rdi + CPU_EXCHANGE_ROLE_INFO.StackPointer]
; update the other CPU's switch state to LOADED
mov byte [rdi + CPU_EXCHANGE_ROLE_INFO.State], CPU_SWITCH_STATE_LOADED
WaitForOtherLoaded:
; wait until the other CPU finish loading new state,
; otherwise the data in stack may corrupt
cmp byte [rsi + CPU_EXCHANGE_ROLE_INFO.State], CPU_SWITCH_STATE_LOADED
jz OtherLoaded
pause
jmp WaitForOtherLoaded
OtherLoaded:
; since the other CPU already get the data it want, leave this procedure
popfq
pop r15
pop r14
pop r13
pop r12
pop r11
pop r10
pop r9
pop r8
pop rbp
pop rdi
pop rsi
pop rdx
pop rcx
pop rbx
pop rax
ret
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