edk2/MdePkg/Library/BaseLib/Ia32/InterlockedCompareExchange32.asm

;------------------------------------------------------------------------------
;
; Copyright (c) 2006, Intel Corporation
; All rights reserved. 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:
;
;   InterlockedCompareExchange32.Asm
;
; Abstract:
;
;   InterlockedCompareExchange32 function
;
; Notes:
;
;------------------------------------------------------------------------------

    .486
    .model  flat,C
    .code

;------------------------------------------------------------------------------
; UINT32
; EFIAPI
; InterlockedCompareExchange32 (
;   IN      UINT32                    *Value,
;   IN      UINT32                    CompareValue,
;   IN      UINT32                    ExchangeValue
;   );
;------------------------------------------------------------------------------
InternalSyncCompareExchange32   PROC
    mov     ecx, [esp + 4]
    mov     eax, [esp + 8]
    mov     edx, [esp + 12]
    lock    cmpxchg [ecx], edx
    ret
InternalSyncCompareExchange32   ENDP

    END