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|
;------------------------------------------------------------------------------ ;
; Copyright (c) 2015, 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
;
;-------------------------------------------------------------------------------
include MpEqu.inc
extern InitializeFloatingPointUnits:PROC
.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 0BFh ; opcode of mov di, mem16
dw PmodeOffsetLocation ; mov di, PmodeOffsetLocation
db 66h, 8Bh, 05h ; mov eax,dword ptr [di]
db 8Bh, 0F8h ; mov di, ax
db 83h, 0EFh,06h ; sub di, 06h
db 66h, 03h, 0C3h ; add eax, ebx
db 66h, 89h, 05h ; mov dword ptr [di],eax
db 0BFh ; opcode of mov di, mem16
dw LmodeOffsetLocation ; mov di, LmodeOffsetLocation
db 66h, 8Bh, 05h ; mov eax,dword ptr [di]
db 8Bh, 0F8h ; mov di, ax
db 83h, 0EFh,06h ; sub di, 06h
db 66h, 03h, 0C3h ; add eax, ebx
db 66h, 89h, 05h ; mov dword ptr [di],eax
db 0BEh
dw Cr3Location ; mov si, Cr3Location
db 66h, 8Bh, 0Ch ; mov ecx,dword ptr [si] ; ECX is keeping the value of CR3
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 PROTECT_MODE_CS ; 16-bit selector
Flat32Start:: ; protected mode entry point
mov ax, PROTECT_MODE_DS
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov ss, ax
db 0Fh, 20h, 0E0h ; mov eax, cr4
db 0Fh, 0BAh, 0E8h, 05h ; bts eax, 5
db 0Fh, 22h, 0E0h ; mov cr4, eax
db 0Fh, 22h, 0D9h ; mov cr3, ecx
db 0B9h
dd 0C0000080h ; mov ecx, 0c0000080h ; EFER MSR number.
db 0Fh, 32h ; rdmsr ; Read EFER.
db 0Fh, 0BAh, 0E8h, 08h ; bts eax, 8 ; Set LME=1.
db 0Fh, 30h ; wrmsr ; Write EFER.
db 0Fh, 20h, 0C0h ; mov eax, cr0 ; Read CR0.
db 0Fh, 0BAh, 0E8h, 1Fh ; bts eax, 31 ; Set PG=1.
db 0Fh, 22h, 0C0h ; mov cr0, eax ; Write CR0.
LONG_JUMP:
db 67h, 0EAh ; far jump
dd 0h ; 32-bit offset
dw LONG_MODE_CS ; 16-bit selector
LongModeStart::
mov ax, LONG_MODE_DS
mov ds, ax
mov es, ax
mov ss, ax
mov esi, ebx
mov edi, esi
add edi, LockLocation
mov rax, NotVacantFlag
TestLock:
xchg qword ptr [edi], rax
cmp rax, 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 rax, qword ptr [edi]
mov edi, esi
add edi, StackStartAddressLocation
add rax, qword ptr [edi]
mov rsp, rax
mov qword ptr [edi], rax
Releaselock:
mov rax, VacantFlag
mov edi, esi
add edi, LockLocation
xchg qword ptr [edi], rax
CProcedureInvoke:
push rbp ; push BIST data
xor rbp, rbp ; clear ebp for call stack trace
push rbp
mov rbp, rsp
mov rax, InitializeFloatingPointUnits
sub rsp, 20h
call rax ; Call assembly function to initialize FPU per UEFI spec
add rsp, 20h
mov edx, ebx ; edx is NumApsExecuting
mov ecx, esi
add ecx, LockLocation ; rcx is address of exchange info data buffer
mov edi, esi
add edi, ApProcedureLocation
mov rax, qword ptr [edi]
sub rsp, 20h
call rax ; invoke C function
add rsp, 20h
jmp $
RendezvousFunnelProc ENDP
RendezvousFunnelProcEnd::
AsmInitializeGdt PROC
push rbp
mov rbp, rsp
lgdt fword PTR [rcx] ; update the GDTR
sub rsp, 0x10
lea rax, SetCodeSelectorFarJump
mov [rsp], rax
mov rdx, LONG_MODE_CS
mov [rsp + 4], dx ; get new CS
jmp fword ptr [rsp]
SetCodeSelectorFarJump:
add rsp, 0x10
mov rax, LONG_MODE_DS ; get new DS
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov ss, ax
pop rbp
ret
AsmInitializeGdt ENDP
END
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