MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.asm

;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution.  The full text of the license may be found at
; http://opensource.org/licenses/bsd-license.php.
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
; Module Name:
;
;   InterlockedCompareExchange64.Asm
;
; Abstract:
;
;   InterlockedCompareExchange64 function
;
; Notes:
;
;------------------------------------------------------------------------------

    .586P
    .model  flat,C
    .code

;------------------------------------------------------------------------------
; UINT64
; EFIAPI
; InternalSyncCompareExchange64 (
;   IN      volatile UINT64           *Value,
;   IN      UINT64                    CompareValue,
;   IN      UINT64                    ExchangeValue
;   );
;------------------------------------------------------------------------------
InternalSyncCompareExchange64   PROC    USES    esi ebx
    mov     esi, [esp + 12]
    mov     eax, [esp + 16]
    mov     edx, [esp + 20]
    mov     ebx, [esp + 24]
    mov     ecx, [esp + 28]
    lock    cmpxchg8b   qword ptr [esi]
    ret
InternalSyncCompareExchange64   ENDP

    END