1 ;------------------------------------------------------------------------------ ;
2 ; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
3 ; This program and the accompanying materials
4 ; are licensed and made available under the terms and conditions of the BSD License
5 ; which accompanies this distribution. The full text of the license may be found at
6 ; http://opensource.org/licenses/bsd-license.php.
8 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
9 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
17 ; This is the assembly code for MP support
19 ;-------------------------------------------------------------------------------
22 extern ASM_PFX(InitializeFloatingPointUnits)
28 ;-------------------------------------------------------------------------------------
29 ;RendezvousFunnelProc procedure follows. All APs execute their procedure. This
30 ;procedure serializes all the AP processors through an Init sequence. It must be
31 ;noted that APs arrive here very raw...ie: real mode, no stack.
32 ;ALSO THIS PROCEDURE IS EXECUTED BY APs ONLY ON 16 BIT MODE. HENCE THIS PROC
34 ;-------------------------------------------------------------------------------------
35 global ASM_PFX(RendezvousFunnelProc)
36 ASM_PFX(RendezvousFunnelProc):
37 RendezvousFunnelProcStart:
38 ; At this point CS = 0x(vv00) and ip= 0x0.
39 ; Save BIST information to ebp firstly
43 mov ebp, eax ; save BIST information
53 mov si, BufferStartLocation
56 mov di, PmodeOffsetLocation
63 mov di, LmodeOffsetLocation
72 mov ecx,[si] ; ECX is keeping the value of CR3
84 mov eax, cr0 ;Get control register 0
85 or eax, 000000003h ;Set PE bit (bit #0) & MP
88 jmp PROTECT_MODE_CS:strict dword 0 ; far jump to protected mode
90 Flat32Start: ; protected mode entry point
91 mov ax, PROTECT_MODE_DS
105 mov ecx, 0c0000080h ; EFER MSR number.
107 bts eax, 8 ; Set LME=1.
110 mov eax, cr0 ; Read CR0.
111 bts eax, 31 ; Set PG=1.
112 mov cr0, eax ; Write CR0.
114 jmp LONG_MODE_CS:strict dword 0 ; far jump to long mode
124 add edi, LockLocation
125 mov rax, NotVacantFlag
128 xchg qword [edi], rax
129 cmp rax, NotVacantFlag
133 add edi, NumApsExecutingLoction
139 add edi, StackSizeLocation
142 add edi, StackStartAddressLocation
150 add edi, LockLocation
151 xchg qword [edi], rax
154 push rbp ; push BIST data at top of AP stack
155 xor rbp, rbp ; clear ebp for call stack trace
159 mov rax, ASM_PFX(InitializeFloatingPointUnits)
161 call rax ; Call assembly function to initialize FPU per UEFI spec
164 mov edx, ebx ; edx is NumApsExecuting
166 add ecx, LockLocation ; rcx is address of exchange info data buffer
169 add edi, ApProcedureLocation
173 call rax ; invoke C function
176 RendezvousFunnelProcEnd:
179 global ASM_PFX(AsmInitializeGdt)
180 ASM_PFX(AsmInitializeGdt):
184 lgdt [rcx] ; update the GDTR
187 mov rax, ASM_PFX(SetCodeSelectorFarJump)
189 mov rdx, LONG_MODE_CS
190 mov [rsp + 4], dx ; get new CS
191 jmp far dword [rsp] ; far jump with new CS
192 ASM_PFX(SetCodeSelectorFarJump):
195 mov rax, LONG_MODE_DS ; get new DS