diff options
Diffstat (limited to 'UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm')
| -rw-r--r-- | UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm | 159 |
1 files changed, 5 insertions, 154 deletions
diff --git a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm index d7e0e1fabd..1daaa72b1e 100644 --- a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm +++ b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm @@ -152,11 +152,6 @@ SkipEnable5LevelPaging: BITS 64
-;
-; Required for the AMD SEV helper functions
-;
-%include "AmdSev.nasm"
-
LongModeStart:
mov esi, ebx
lea edi, [esi + MP_CPU_EXCHANGE_INFO_FIELD (InitFlag)]
@@ -265,154 +260,12 @@ CProcedureInvoke: add rsp, 20h
jmp $ ; Should never reach here
-RendezvousFunnelProcEnd:
-
-;-------------------------------------------------------------------------------------
-;SwitchToRealProc procedure follows.
-;ALSO THIS PROCEDURE IS EXECUTED BY APs TRANSITIONING TO 16 BIT MODE. HENCE THIS PROC
-;IS IN MACHINE CODE.
-; SwitchToRealProc (UINTN BufferStart, UINT16 Code16, UINT16 Code32, UINTN StackStart)
-; rcx - Buffer Start
-; rdx - Code16 Selector Offset
-; r8 - Code32 Selector Offset
-; r9 - Stack Start
-;-------------------------------------------------------------------------------------
-SwitchToRealProcStart:
-BITS 64
- cli
-
- ;
- ; Get RDX reset value before changing stacks since the
- ; new stack won't be able to accomodate a #VC exception.
- ;
- push rax
- push rbx
- push rcx
- push rdx
-
- mov rax, 1
- cpuid
- mov rsi, rax ; Save off the reset value for RDX
-
- pop rdx
- pop rcx
- pop rbx
- pop rax
-
- ;
- ; Establish stack below 1MB
- ;
- mov rsp, r9
-
- ;
- ; Push ultimate Reset Vector onto the stack
- ;
- mov rax, rcx
- shr rax, 4
- push word 0x0002 ; RFLAGS
- push ax ; CS
- push word 0x0000 ; RIP
- push word 0x0000 ; For alignment, will be discarded
-
- ;
- ; Get address of "16-bit operand size" label
- ;
- lea rbx, [PM16Mode]
-
- ;
- ; Push addresses used to change to compatibility mode
- ;
- lea rax, [CompatMode]
- 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
-CompatMode:
- ;
- ; Set up stack to prepare for exiting protected mode
- ;
- push edx ; Code16 CS
- push ebx ; PM16Mode label address
-
- ;
- ; Disable paging
- ;
- mov eax, cr0 ; Read CR0
- btr eax, 31 ; Set PG=0
- mov cr0, eax ; Write CR0
-
- ;
- ; Disable long mode
- ;
- mov ecx, 0c0000080h ; EFER MSR number
- rdmsr ; Read EFER
- btr eax, 8 ; Set LME=0
- wrmsr ; Write EFER
-
- ;
- ; Disable PAE
- ;
- mov eax, cr4 ; Read CR4
- btr eax, 5 ; Set PAE=0
- mov cr4, eax ; Write CR4
-
- mov edx, esi ; Restore RDX reset value
-
- ;
- ; Switch to 16-bit operand size
- ;
- retf
-
-BITS 16
- ;
- ; At entry to this label
- ; - RDX will have its reset value
- ; - On the top of the stack
- ; - Alignment data (two bytes) to be discarded
- ; - IP for Real Mode (two bytes)
- ; - CS for Real Mode (two bytes)
- ;
- ; This label is also used with AsmRelocateApLoop. During MP finalization,
- ; the code from PM16Mode to SwitchToRealProcEnd is copied to the start of
- ; the WakeupBuffer, allowing a parked AP to be booted by an OS.
- ;
-PM16Mode:
- mov eax, cr0 ; Read CR0
- btr eax, 0 ; Set PE=0
- mov cr0, eax ; Write CR0
-
- pop ax ; Discard alignment data
-
- ;
- ; Clear registers (except RDX and RSP) before going into 16-bit mode
- ;
- xor eax, eax
- xor ebx, ebx
- xor ecx, ecx
- xor esi, esi
- xor edi, edi
- xor ebp, ebp
-
- iret
+;
+; Required for the AMD SEV helper functions
+;
+%include "AmdSev.nasm"
-SwitchToRealProcEnd:
+RendezvousFunnelProcEnd:
;-------------------------------------------------------------------------------------
; AsmRelocateApLoop (MwaitSupport, ApTargetCState, PmCodeSegment, TopOfApStack, CountTofinish, Pm16CodeSegment, SevEsAPJumpTable, WakeupBuffer);
@@ -596,8 +449,6 @@ 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
- mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.SwitchToRealSize], SwitchToRealProcEnd - SwitchToRealProcStart
- mov qword [rcx + MP_ASSEMBLY_ADDRESS_MAP.SwitchToRealOffset], SwitchToRealProcStart - 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
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