diff options
Diffstat (limited to 'UefiCpuPkg/CpuMpPei/X64/MpFuncs.nasm')
| -rw-r--r-- | UefiCpuPkg/CpuMpPei/X64/MpFuncs.nasm | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/UefiCpuPkg/CpuMpPei/X64/MpFuncs.nasm b/UefiCpuPkg/CpuMpPei/X64/MpFuncs.nasm index bd595724c2..99669ce95e 100644 --- a/UefiCpuPkg/CpuMpPei/X64/MpFuncs.nasm +++ b/UefiCpuPkg/CpuMpPei/X64/MpFuncs.nasm @@ -19,9 +19,158 @@ ;------------------------------------------------------------------------------- %include "MpEqu.inc" + 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 eax, 1234h + 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, PmodeOffsetLocation + mov eax, [di] + mov di, ax + sub di, 06h + add eax, ebx + mov [di],eax + + mov di, LmodeOffsetLocation + mov eax, [di] + mov di, ax + sub di, 06h + add eax, ebx + mov [di],eax + + + mov si, Cr3Location + mov ecx,[si] ; ECX is keeping the value of CR3 + + mov si, GdtrLocation +o32 lgdt [cs:si] + + mov si, IdtrLocation +o32 lidt [cs:si] + + + xor ax, ax + mov ds, ax + + mov eax, cr0 ;Get control register 0 + or eax, 000000003h ;Set PE bit (bit #0) & MP + mov cr0, eax + + jmp PROTECT_MODE_CS:strict dword 0 ; far jump to protected mode +BITS 32 +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 + + mov eax, cr4 + bts eax, 5 + mov cr4, eax + + mov cr3, ecx + + + 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 LONG_MODE_CS:strict dword 0 ; far jump to long mode +BITS 64 +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 [edi], rax + cmp rax, NotVacantFlag + jz TestLock + + mov edi, esi + add edi, NumApsExecutingLoction + 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 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 + +RendezvousFunnelProcEnd: + + global ASM_PFX(AsmInitializeGdt) ASM_PFX(AsmInitializeGdt): push rbp |