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system76-edk2/UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm
Tom Lendacky 20da7ca42a UefiCpuPkg/MpInitLib: Prepare SEV-ES guest APs for OS use 
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198

Before UEFI transfers control to the OS, it must park the AP. This is
done using the AsmRelocateApLoop function to transition into 32-bit
non-paging mode. For an SEV-ES guest, a few additional things must be
done:
  - AsmRelocateApLoop must be updated to support SEV-ES. This means
    performing a VMGEXIT AP Reset Hold instead of an MWAIT or HLT loop.
  - Since the AP must transition to real mode, a small routine is copied
    to the WakeupBuffer area. Since the WakeupBuffer will be used by
    the AP during OS booting, it must be placed in reserved memory.
    Additionally, the AP stack must be located where it can be accessed
    in real mode.
  - Once the AP is in real mode it will transfer control to the
    destination specified by the OS in the SEV-ES AP Jump Table. The
    SEV-ES AP Jump Table address is saved by the hypervisor for the OS
    using the GHCB VMGEXIT AP Jump Table exit code.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
2020-08-17 02:46:39 +00:00

361 lines
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NASM
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;------------------------------------------------------------------------------ ;
; Copyright (c) 2015 - 2019, 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)
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.
;-------------------------------------------------------------------------------------
global ASM_PFX(RendezvousFunnelProc)
ASM_PFX(RendezvousFunnelProc):
RendezvousFunnelProcStart:
; At this point CS = 0x(vv00) and ip= 0x0.
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, BufferStartLocation
mov ebx, [si]
mov si, DataSegmentLocation
mov edx, [si]
;
; Get start address of 32-bit code in low memory (<1MB)
;
mov edi, ModeTransitionMemoryLocation
mov si, GdtrLocation
o32 lgdt [cs:si]
mov si, IdtrLocation
o32 lidt [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 in executable memory (>1MB)
o32 jmp far [cs:di]
;
; Following code may be copied to memory with type of EfiBootServicesCode.
; This is required at DXE phase 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
mov esi, ebx
mov edi, esi
add edi, EnableExecuteDisableLocation
cmp byte [edi], 0
jz SkipEnableExecuteDisable
;
; Enable IA32 PAE execute disable
;
mov ecx, 0xc0000080
rdmsr
bts eax, 11
wrmsr
mov edi, esi
add edi, Cr3Location
mov eax, dword [edi]
mov cr3, eax
mov eax, cr4
bts eax, 5
mov cr4, eax
mov eax, cr0
bts eax, 31
mov cr0, eax
SkipEnableExecuteDisable:
mov edi, esi
add edi, InitFlagLocation
cmp dword [edi], 1 ; 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, NumApsExecutingLocation
lock inc dword [edi]
; AP init
mov edi, esi
add edi, LockLocation
mov eax, NotVacantFlag
TestLock:
xchg [edi], eax
cmp eax, NotVacantFlag
jz TestLock
mov ecx, esi
add ecx, ApIndexLocation
inc dword [ecx]
mov ebx, [ecx]
Releaselock:
mov eax, VacantFlag
xchg [edi], eax
mov edi, esi
add edi, StackSizeLocation
mov eax, [edi]
mov ecx, ebx
inc ecx
mul ecx ; EAX = StackSize * (CpuNumber + 1)
mov edi, esi
add edi, StackStartAddressLocation
add eax, [edi]
mov esp, eax
jmp CProcedureInvoke
GetApicId:
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 + CpuInfoLocation]
mov edi, [eax]
GetNextProcNumber:
cmp [edi], edx ; APIC ID match?
jz ProgramStack
add edi, 20
inc ebx
jmp GetNextProcNumber
ProgramStack:
mov esp, [edi + 12]
CProcedureInvoke:
push ebp ; push BIST data at top of AP stack
xor ebp, ebp ; clear ebp for call stack trace
push ebp
mov ebp, esp
mov eax, ASM_PFX(InitializeFloatingPointUnits)
call eax ; Call assembly function to initialize FPU per UEFI spec
push ebx ; Push ApIndex
mov eax, esi
add eax, LockLocation
push eax ; push address of exchange info data buffer
mov edi, esi
add edi, ApProcedureLocation
mov eax, [edi]
call eax ; Invoke C function
jmp $ ; Never reach here
RendezvousFunnelProcEnd:
;-------------------------------------------------------------------------------------
;SwitchToRealProc procedure follows.
;NOT USED IN 32 BIT MODE.
;-------------------------------------------------------------------------------------
global ASM_PFX(SwitchToRealProc)
ASM_PFX(SwitchToRealProc):
SwitchToRealProcStart:
jmp $ ; Never reach here
SwitchToRealProcEnd:
;-------------------------------------------------------------------------------------
; AsmRelocateApLoop (MwaitSupport, ApTargetCState, PmCodeSegment, TopOfApStack, CountTofinish, Pm16CodeSegment, SevEsAPJumpTable, WakeupBuffer);
;
; The last three parameters (Pm16CodeSegment, SevEsAPJumpTable and WakeupBuffer) are
; specific to SEV-ES support and are not applicable on IA32.
;-------------------------------------------------------------------------------------
global ASM_PFX(AsmRelocateApLoop)
ASM_PFX(AsmRelocateApLoop):
AsmRelocateApLoopStart:
mov eax, esp
mov esp, [eax + 16] ; TopOfApStack
push dword [eax] ; push return address for stack trace
push ebp
mov ebp, esp
mov ebx, [eax + 8] ; ApTargetCState
mov ecx, [eax + 4] ; MwaitSupport
mov eax, [eax + 20] ; CountTofinish
lock dec dword [eax] ; (*CountTofinish)--
cmp cl, 1 ; Check mwait-monitor support
jnz HltLoop
MwaitLoop:
cli
mov eax, esp
xor ecx, ecx
xor edx, edx
monitor
mov eax, ebx ; Mwait Cx, Target C-State per eax[7:4]
shl eax, 4
mwait
jmp MwaitLoop
HltLoop:
cli
hlt
jmp HltLoop
AsmRelocateApLoopEnd:
;-------------------------------------------------------------------------------------
; AsmGetAddressMap (&AddressMap);
;-------------------------------------------------------------------------------------
global ASM_PFX(AsmGetAddressMap)
ASM_PFX(AsmGetAddressMap):
pushad
mov ebp,esp
mov ebx, [ebp + 24h]
mov dword [ebx], RendezvousFunnelProcStart
mov dword [ebx + 4h], Flat32Start - RendezvousFunnelProcStart
mov dword [ebx + 8h], RendezvousFunnelProcEnd - RendezvousFunnelProcStart
mov dword [ebx + 0Ch], AsmRelocateApLoopStart
mov dword [ebx + 10h], AsmRelocateApLoopEnd - AsmRelocateApLoopStart
mov dword [ebx + 14h], Flat32Start - RendezvousFunnelProcStart
mov dword [ebx + 18h], SwitchToRealProcEnd - SwitchToRealProcStart ; SwitchToRealSize
mov dword [ebx + 1Ch], SwitchToRealProcStart - RendezvousFunnelProcStart ; SwitchToRealOffset
mov dword [ebx + 20h], SwitchToRealProcStart - Flat32Start ; SwitchToRealNoNxOffset
mov dword [ebx + 24h], 0 ; SwitchToRealPM16ModeOffset
mov dword [ebx + 28h], 0 ; SwitchToRealPM16ModeSize
popad
ret
;-------------------------------------------------------------------------------------
;AsmExchangeRole procedure follows. This procedure executed by current BSP, that is
;about to become an AP. It switches it'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.
pushad
mov ebp,esp
; esi contains MyInfo pointer
mov esi, [ebp + 24h]
; edi contains OthersInfo pointer
mov edi, [ebp + 28h]
;Store EFLAGS, GDTR and IDTR register to stack
pushfd
mov eax, cr4
push eax ; push cr4 firstly
mov eax, cr0
push eax
sgdt [esi + 8]
sidt [esi + 14]
; Store the its StackPointer
mov [esi + 4],esp
; update its switch state to STORED
mov byte [esi], CPU_SWITCH_STATE_STORED
WaitForOtherStored:
; wait until the other CPU finish storing its state
cmp byte [edi], CPU_SWITCH_STATE_STORED
jz OtherStored
pause
jmp WaitForOtherStored
OtherStored:
; Since another CPU already stored its state, load them
; load GDTR value
lgdt [edi + 8]
; load IDTR value
lidt [edi + 14]
; load its future StackPointer
mov esp, [edi + 4]
; update the other CPU's switch state to LOADED
mov byte [edi], CPU_SWITCH_STATE_LOADED
WaitForOtherLoaded:
; wait until the other CPU finish loading new state,
; otherwise the data in stack may corrupt
cmp byte [esi], CPU_SWITCH_STATE_LOADED
jz OtherLoaded
pause
jmp WaitForOtherLoaded
OtherLoaded:
; since the other CPU already get the data it want, leave this procedure
pop eax
mov cr0, eax
pop eax
mov cr4, eax
popfd
popad
ret
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