| Vishal Bhoj | 82c8071 | 2015-12-15 21:13:33 +0530 | [diff] [blame^] | 1 | ;------------------------------------------------------------------------------
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| 2 | ;
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| 3 | ; Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
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| 4 | ; This program and the accompanying materials
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| 5 | ; are licensed and made available under the terms and conditions of the BSD License
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| 6 | ; which accompanies this distribution. The full text of the license may be found at
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| 7 | ; http://opensource.org/licenses/bsd-license.php.
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| 8 | ;
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| 9 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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| 10 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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| 11 | ;
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| 12 | ;------------------------------------------------------------------------------
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| 13 |
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| 14 | extern ASM_PFX(mTopOfApCommonStack)
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| 15 | extern ASM_PFX(ApEntryPointInC)
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| 16 |
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| 17 | DEFAULT REL
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| 18 |
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| 19 | SECTION .data
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| 20 |
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| 21 | ;
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| 22 | ; This lock only allows one AP to use the mTopOfApCommonStack stack at a time
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| 23 | ;
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| 24 | ApStackLock:
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| 25 | dd 0
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| 26 |
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| 27 | SECTION .text
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| 28 |
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| 29 | ;------------------------------------------------------------------------------
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| 30 | ; VOID
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| 31 | ; EFIAPI
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| 32 | ; AsmApEntryPoint (
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| 33 | ; VOID
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| 34 | ; );
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| 35 | ;------------------------------------------------------------------------------
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| 36 | global ASM_PFX(AsmApEntryPoint)
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| 37 | ASM_PFX(AsmApEntryPoint):
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| 38 | cli
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| 39 | AsmApEntryPointAcquireLock:
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| 40 | lock bts dword [ApStackLock], 0
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| 41 | pause
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| 42 | jc AsmApEntryPointAcquireLock
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| 43 |
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| 44 | mov rsp, [ASM_PFX(mTopOfApCommonStack)]
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| 45 | call ASM_PFX(ApEntryPointInC)
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| 46 |
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| 47 | cli
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| 48 |
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| 49 | lock btc dword [ApStackLock], 0
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| 50 |
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| 51 | mov eax, 0x100
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| 52 | AsmApEntryPointShareLock:
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| 53 | pause
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| 54 | dec eax
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| 55 | jnz AsmApEntryPointShareLock
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| 56 |
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| 57 | jmp ASM_PFX(AsmApEntryPoint)
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| 58 |
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| 59 | ;------------------------------------------------------------------------------
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| 60 | ; VOID
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| 61 | ; EFIAPI
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| 62 | ; AsmApDoneWithCommonStack (
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| 63 | ; VOID
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| 64 | ; );
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| 65 | ;------------------------------------------------------------------------------
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| 66 | global ASM_PFX(AsmApDoneWithCommonStack)
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| 67 | ASM_PFX(AsmApDoneWithCommonStack):
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| 68 | lock btc dword [ApStackLock], 0
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| 69 | ret
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| 70 |
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