1;------------------------------------------------------------------------------
2;
3; Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
4; This program and the accompanying materials
5; are licensed and made available under the terms and conditions of the BSD License
6; which accompanies this distribution.  The full text of the license may be found at
7; http://opensource.org/licenses/bsd-license.php.
8;
9; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
11;
12;------------------------------------------------------------------------------
13
14extern ASM_PFX(mTopOfApCommonStack)
15extern ASM_PFX(ApEntryPointInC)
16
17DEFAULT REL
18
19SECTION .data
20
21;
22; This lock only allows one AP to use the mTopOfApCommonStack stack at a time
23;
24ApStackLock:
25    dd      0
26
27SECTION .text
28
29;------------------------------------------------------------------------------
30; VOID
31; EFIAPI
32; AsmApEntryPoint (
33;   VOID
34;   );
35;------------------------------------------------------------------------------
36global ASM_PFX(AsmApEntryPoint)
37ASM_PFX(AsmApEntryPoint):
38    cli
39AsmApEntryPointAcquireLock:
40lock bts    dword [ApStackLock], 0
41    pause
42    jc      AsmApEntryPointAcquireLock
43
44    mov     rsp, [ASM_PFX(mTopOfApCommonStack)]
45    call    ASM_PFX(ApEntryPointInC)
46
47    cli
48
49lock btc    dword [ApStackLock], 0
50
51    mov     eax, 0x100
52AsmApEntryPointShareLock:
53    pause
54    dec     eax
55    jnz     AsmApEntryPointShareLock
56
57    jmp     ASM_PFX(AsmApEntryPoint)
58
59;------------------------------------------------------------------------------
60; VOID
61; EFIAPI
62; AsmApDoneWithCommonStack (
63;   VOID
64;   );
65;------------------------------------------------------------------------------
66global ASM_PFX(AsmApDoneWithCommonStack)
67ASM_PFX(AsmApDoneWithCommonStack):
68lock btc    dword [ApStackLock], 0
69    ret
70
71