audk/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.nasm

;------------------------------------------------------------------------------
;
; 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:
;
;------------------------------------------------------------------------------

    SECTION .text

;------------------------------------------------------------------------------
; UINT64
; EFIAPI
; InternalSyncCompareExchange64 (
;   IN      volatile UINT64           *Value,
;   IN      UINT64                    CompareValue,
;   IN      UINT64                    ExchangeValue
;   );
;------------------------------------------------------------------------------
global ASM_PFX(InternalSyncCompareExchange64)
ASM_PFX(InternalSyncCompareExchange64):
    push    esi
    push    ebx
    mov     esi, [esp + 12]
    mov     eax, [esp + 16]
    mov     edx, [esp + 20]
    mov     ebx, [esp + 24]
    mov     ecx, [esp + 28]
    lock    cmpxchg8b [esi]
    pop     ebx
    pop     esi
    ret