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)
26 ;-------------------------------------------------------------------------------------
27 ;RendezvousFunnelProc procedure follows. All APs execute their procedure. This
28 ;procedure serializes all the AP processors through an Init sequence. It must be
29 ;noted that APs arrive here very raw...ie: real mode, no stack.
30 ;ALSO THIS PROCEDURE IS EXECUTED BY APs ONLY ON 16 BIT MODE. HENCE THIS PROC
32 ;-------------------------------------------------------------------------------------
33 global ASM_PFX(RendezvousFunnelProc)
34 ASM_PFX(RendezvousFunnelProc):
35 RendezvousFunnelProcStart:
36 ; At this point CS = 0x(vv00) and ip= 0x0.
38 mov ebp, eax ; save BIST information
48 mov si, BufferStartLocation
51 mov di, PmodeOffsetLocation
67 mov eax, cr0 ;Get control register 0
68 or eax, 000000003h ;Set PE bit (bit #0) & MP
71 jmp PROTECT_MODE_CS:strict dword 0 ; far jump to protected mode
73 Flat32Start: ; protected mode entry point
74 mov ax, PROTECT_MODE_DS
84 mov eax, NotVacantFlag
88 cmp eax, NotVacantFlag
92 add edi, NumApsExecutingLoction
98 add edi, StackSizeLocation
101 add edi, StackStartAddressLocation
109 add edi, LockLocation
113 push ebp ; push BIST data at top of AP stack
114 xor ebp, ebp ; clear ebp for call stack trace
118 mov eax, ASM_PFX(InitializeFloatingPointUnits)
119 call eax ; Call assembly function to initialize FPU per UEFI spec
121 push ebx ; Push NumApsExecuting
123 add eax, LockLocation
124 push eax ; push address of exchange info data buffer
127 add edi, ApProcedureLocation
130 call eax ; invoke C function
132 jmp $ ; never reach here
133 RendezvousFunnelProcEnd:
136 global ASM_PFX(AsmInitializeGdt)
137 ASM_PFX(AsmInitializeGdt):
141 mov edi, [ebp + 8] ; Load GDT register
143 lgdt [edi] ; and update the GDTR
146 mov eax, ASM_PFX(SetCodeSelectorFarJump)
149 ASM_PFX(SetCodeSelectorFarJump):
150 mov ax, PROTECT_MODE_DS ; Update the Base for the new selectors, too