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|
;------------------------------------------------------------------------------ ;
; Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution. The full text of the license may be found at
; http://opensource.org/licenses/bsd-license.php.
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
; Module Name:
;
; MpFuncs32.asm
;
; Abstract:
;
; This is the assembly code for MP support
;
;-------------------------------------------------------------------------------
.686p
.model flat
include MpEqu.inc
InitializeFloatingPointUnits PROTO C
.code
;-------------------------------------------------------------------------------------
;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.
;-------------------------------------------------------------------------------------
RendezvousFunnelProc PROC PUBLIC
RendezvousFunnelProcStart::
; At this point CS = 0x(vv00) and ip= 0x0.
; Save BIST information to ebp firstly
db 66h, 08bh, 0e8h ; mov ebp, eax ; save BIST information
db 8ch,0c8h ; mov ax, cs
db 8eh,0d8h ; mov ds, ax
db 8eh,0c0h ; mov es, ax
db 8eh,0d0h ; mov ss, ax
db 33h,0c0h ; xor ax, ax
db 8eh,0e0h ; mov fs, ax
db 8eh,0e8h ; mov gs, ax
db 0BEh ; opcode of mov si, mem16
dw BufferStartLocation ; mov si, BufferStartLocation
db 66h, 8Bh, 1Ch ; mov ebx, dword ptr [si]
db 0BEh ; opcode of mov si, mem16
dw ModeOffsetLocation ; mov si, ModeOffsetLocation
db 66h, 8Bh, 04h ; mov eax, [si]
db 0BEh ; opcode of mov si, mem16
dw CodeSegmentLocation ; mov si, CodeSegmentLocation
db 66h, 8Bh, 14h ; mov edx, [si]
db 89h, 0C7h ; mov di, ax
db 83h, 0EFh, 02h ; sub di, 02h
db 89h, 15h ; mov [di], dx
db 83h, 0EFh, 04h ; sub di, 04h
db 66h, 01h, 0D8h ; add eax, ebx
db 66h, 89h, 05h ; mov [di], eax
db 0BEh ; opcode of mov si, mem16
dw DataSegmentLocation ; mov si, DataSegmentLocation
db 66h, 8Bh, 14h ; mov edx, [si]
db 0BEh ; opcode of mov si, mem16
dw GdtrLocation ; mov si, GdtrLocation
db 66h ; db 66h
db 2Eh, 0Fh, 01h, 14h ; lgdt fword ptr cs:[si]
db 0BEh
dw IdtrLocation ; mov si, IdtrLocation
db 66h ; db 66h
db 2Eh,0Fh, 01h, 1Ch ; lidt fword ptr cs:[si]
db 33h, 0C0h ; xor ax, ax
db 8Eh, 0D8h ; mov ds, ax
db 0Fh, 20h, 0C0h ; mov eax, cr0 ;Get control register 0
db 66h, 83h, 0C8h, 03h ; or eax, 000000003h ;Set PE bit (bit #0) & MP
db 0Fh, 22h, 0C0h ; mov cr0, eax
db 66h, 67h, 0EAh ; far jump
dd 0h ; 32-bit offset
dw 0h ; 16-bit selector
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, LockLocation
mov eax, NotVacantFlag
TestLock:
xchg dword ptr [edi], eax
cmp eax, NotVacantFlag
jz TestLock
mov edi, esi
add edi, NumApsExecutingLoction
inc dword ptr [edi]
mov ebx, dword ptr [edi]
ProgramStack:
mov edi, esi
add edi, StackSizeLocation
mov eax, dword ptr [edi]
mov edi, esi
add edi, StackStartAddressLocation
add eax, dword ptr [edi]
mov esp, eax
mov dword ptr [edi], eax
Releaselock:
mov eax, VacantFlag
mov edi, esi
add edi, LockLocation
xchg dword ptr [edi], eax
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, InitializeFloatingPointUnits
call eax ; Call assembly function to initialize FPU per UEFI spec
push ebx ; Push NumApsExecuting
mov eax, esi
add eax, LockLocation
push eax ; push address of exchange info data buffer
mov edi, esi
add edi, ApProcedureLocation
mov eax, dword ptr [edi]
call eax ; invoke C function
jmp $ ; never reach here
RendezvousFunnelProc ENDP
RendezvousFunnelProcEnd::
;-------------------------------------------------------------------------------------
; AsmGetAddressMap (&AddressMap);
;-------------------------------------------------------------------------------------
AsmGetAddressMap PROC near C PUBLIC
pushad
mov ebp,esp
mov ebx, dword ptr [ebp+24h]
mov dword ptr [ebx], RendezvousFunnelProcStart
mov dword ptr [ebx + 4h], Flat32Start - RendezvousFunnelProcStart
mov dword ptr [ebx + 8h], RendezvousFunnelProcEnd - RendezvousFunnelProcStart
popad
ret
AsmGetAddressMap ENDP
PAUSE32 MACRO
DB 0F3h
DB 090h
ENDM
;-------------------------------------------------------------------------------------
;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);
;-------------------------------------------------------------------------------------
AsmExchangeRole PROC near C PUBLIC
; 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, dword ptr [ebp+24h]
; edi contains OthersInfo pointer
mov edi, dword ptr [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 fword ptr [esi+8]
sidt fword ptr [esi+14]
; Store the its StackPointer
mov dword ptr [esi+4],esp
; update its switch state to STORED
mov byte ptr [esi], CPU_SWITCH_STATE_STORED
WaitForOtherStored:
; wait until the other CPU finish storing its state
cmp byte ptr [edi], CPU_SWITCH_STATE_STORED
jz OtherStored
PAUSE32
jmp WaitForOtherStored
OtherStored:
; Since another CPU already stored its state, load them
; load GDTR value
lgdt fword ptr [edi+8]
; load IDTR value
lidt fword ptr [edi+14]
; load its future StackPointer
mov esp, dword ptr [edi+4]
; update the other CPU's switch state to LOADED
mov byte ptr [edi], CPU_SWITCH_STATE_LOADED
WaitForOtherLoaded:
; wait until the other CPU finish loading new state,
; otherwise the data in stack may corrupt
cmp byte ptr [esi], CPU_SWITCH_STATE_LOADED
jz OtherLoaded
PAUSE32
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
AsmExchangeRole ENDP
END
|
