MpAsm.asm revision fab82c1873b792bce33fb22c32db71324fc0ac3b 
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
14.586p
15.model flat, C
16
17extern mTopOfApCommonStack:DWORD
18extern ApEntryPointInC:PROC
19
20.code
21
22;
23; This lock only allows one AP to use the mTopOfApCommonStack stack at a time
24;
25ApStackLock dd      0
26
27;.code
28
29;------------------------------------------------------------------------------
30; VOID
31; EFIAPI
32; AsmApEntryPoint (
33;   VOID
34;   );
35;------------------------------------------------------------------------------
36AsmApEntryPoint PROC
37
38    cli
39AsmApEntryPointAcquireLock:
40lock bts    dword ptr [ApStackLock], 0
41    pause
42    jc      AsmApEntryPointAcquireLock
43
44    mov     esp, [mTopOfApCommonStack]
45    call    ApEntryPointInC
46
47    cli
48
49lock btc    dword ptr [ApStackLock], 0
50
51    mov     eax, 100h
52AsmApEntryPointShareLock:
53    pause
54    dec     eax
55    jnz     AsmApEntryPointShareLock
56
57    jmp     AsmApEntryPoint
58
59AsmApEntryPoint ENDP
60
61;------------------------------------------------------------------------------
62; VOID
63; EFIAPI
64; AsmApDoneWithCommonStack (
65;   VOID
66;   );
67;------------------------------------------------------------------------------
68AsmApDoneWithCommonStack PROC PUBLIC
69
70lock btc    dword ptr [ApStackLock], 0
71    ret
72
73AsmApDoneWithCommonStack ENDP
74
75END
76