| ;------------------------------------------------------------------------------ ; | |
| ; 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: | |
| ; | |
| ; MpFuncs.nasm | |
| ; | |
| ; Abstract: | |
| ; | |
| ; This is the assembly code for MP support | |
| ; | |
| ;------------------------------------------------------------------------------- | |
| %include "MpEqu.inc" | |
| extern ASM_PFX(InitializeFloatingPointUnits) | |
| 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. | |
| ;------------------------------------------------------------------------------------- | |
| global ASM_PFX(RendezvousFunnelProc) | |
| ASM_PFX(RendezvousFunnelProc): | |
| 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, BufferStartLocation | |
| mov ebx, [si] | |
| mov di, ModeOffsetLocation | |
| mov eax, [di] | |
| mov di, CodeSegmentLocation | |
| mov edx, [di] | |
| mov di, ax | |
| sub di, 02h | |
| mov [di],dx ; Patch long mode CS | |
| sub di, 04h | |
| add eax, ebx | |
| mov [di],eax ; Patch address | |
| mov si, GdtrLocation | |
| o32 lgdt [cs:si] | |
| mov si, IdtrLocation | |
| o32 lidt [cs:si] | |
| mov di, DataSegmentLocation | |
| mov edi, [di] ; Save long mode DS in edi | |
| mov si, Cr3Location ; Save CR3 in ecx | |
| mov ecx, [si] | |
| xor ax, ax | |
| mov ds, ax ; Clear data segment | |
| mov eax, cr0 ; Get control register 0 | |
| or eax, 000000003h ; Set PE bit (bit #0) & MP | |
| mov cr0, eax | |
| mov eax, cr4 | |
| bts eax, 5 | |
| mov cr4, eax | |
| mov cr3, ecx ; Load CR3 | |
| mov ecx, 0c0000080h ; EFER MSR number | |
| rdmsr ; Read EFER | |
| bts eax, 8 ; Set LME=1 | |
| wrmsr ; Write EFER | |
| mov eax, cr0 ; Read CR0 | |
| bts eax, 31 ; Set PG=1 | |
| mov cr0, eax ; Write CR0 | |
| jmp 0:strict dword 0 ; far jump to long mode | |
| BITS 64 | |
| LongModeStart: | |
| mov eax, edi | |
| mov ds, ax | |
| mov es, ax | |
| mov ss, ax | |
| mov esi, ebx | |
| mov edi, esi | |
| add edi, LockLocation | |
| mov rax, NotVacantFlag | |
| TestLock: | |
| xchg qword [edi], rax | |
| cmp rax, NotVacantFlag | |
| jz TestLock | |
| mov edi, esi | |
| add edi, NumApsExecutingLocation | |
| inc dword [edi] | |
| mov ebx, [edi] | |
| ProgramStack: | |
| mov edi, esi | |
| add edi, StackSizeLocation | |
| mov rax, qword [edi] | |
| mov edi, esi | |
| add edi, StackStartAddressLocation | |
| add rax, qword [edi] | |
| mov rsp, rax | |
| mov qword [edi], rax | |
| Releaselock: | |
| mov rax, VacantFlag | |
| mov edi, esi | |
| add edi, LockLocation | |
| xchg qword [edi], rax | |
| 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, ASM_PFX(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 [edi] | |
| sub rsp, 20h | |
| call rax ; Invoke C function | |
| add rsp, 20h | |
| jmp $ ; Should never reach here | |
| RendezvousFunnelProcEnd: | |
| ;------------------------------------------------------------------------------------- | |
| ; AsmGetAddressMap (&AddressMap); | |
| ;------------------------------------------------------------------------------------- | |
| global ASM_PFX(AsmGetAddressMap) | |
| ASM_PFX(AsmGetAddressMap): | |
| mov rax, ASM_PFX(RendezvousFunnelProc) | |
| mov qword [rcx], rax | |
| mov qword [rcx + 8h], LongModeStart - RendezvousFunnelProcStart | |
| mov qword [rcx + 10h], RendezvousFunnelProcEnd - RendezvousFunnelProcStart | |
| 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 | |
| mov rax, cr0 | |
| push rax | |
| mov rax, cr4 | |
| push rax | |
| ; rsi contains MyInfo pointer | |
| mov rsi, rcx | |
| ; rdi contains OthersInfo pointer | |
| mov rdi, rdx | |
| ;Store EFLAGS, GDTR and IDTR regiter to stack | |
| pushfq | |
| sgdt [rsi + 16] | |
| sidt [rsi + 26] | |
| ; Store the its StackPointer | |
| mov [rsi + 8], rsp | |
| ; update its switch state to STORED | |
| mov byte [rsi], CPU_SWITCH_STATE_STORED | |
| WaitForOtherStored: | |
| ; wait until the other CPU finish storing its state | |
| cmp byte [rdi], CPU_SWITCH_STATE_STORED | |
| jz OtherStored | |
| pause | |
| jmp WaitForOtherStored | |
| OtherStored: | |
| ; Since another CPU already stored its state, load them | |
| ; load GDTR value | |
| lgdt [rdi + 16] | |
| ; load IDTR value | |
| lidt [rdi + 26] | |
| ; load its future StackPointer | |
| mov rsp, [rdi + 8] | |
| ; update the other CPU's switch state to LOADED | |
| mov byte [rdi], 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_SWITCH_STATE_LOADED | |
| jz OtherLoaded | |
| pause | |
| jmp WaitForOtherLoaded | |
| OtherLoaded: | |
| ; since the other CPU already get the data it want, leave this procedure | |
| popfq | |
| pop rax | |
| mov cr4, rax | |
| pop rax | |
| mov cr0, rax | |
| 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 |