#------------------------------------------------------------------------------
#
# 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:
#
#   InterlockedCompareExchange64.Asm
#
# Abstract:
#
#   InterlockedCompareExchange64 function
#
# Notes:
#
#------------------------------------------------------------------------------



     

#------------------------------------------------------------------------------
# UINT64
# EFIAPI
# InterlockedCompareExchange64 (
#   IN      UINT64                    *Value,
#   IN      UINT64                    CompareValue,
#   IN      UINT64                    ExchangeValue
#   );
#------------------------------------------------------------------------------
.global _InterlockedCompareExchange64
    push    %esi
    push    %ebx
    movl    12(%esp),%esi
    movl    16(%esp),%eax
    movl    20(%esp),%edx
    movl    24(%esp),%ebx
    movl    28(%esp),%ecx
    lock    
    cmpxchg8b   (%esi)
    pop     %ebx
    pop     %esi
    ret