MdePkg/Library/BaseLib/X64/InterlockedCompareExchange64.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation
   4 ; All rights reserved. This program and the accompanying materials
   5 ; are licensed and made available under the terms and conditions of the BSD License
   6 ; which accompanies this distribution.  The full text of the license may be found at
   7 ; http://opensource.org/licenses/bsd-license.php
   8 ;
   9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 ;
  12 ; Module Name:
  13 ;
  14 ;   InterlockedCompareExchange64.Asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   InterlockedCompareExchange64 function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     .code
  25
  26 ;------------------------------------------------------------------------------
  27 ; UINT64
  28 ; EFIAPI
  29 ; InterlockedCompareExchange64 (
  30 ;   IN      UINT64                    *Value,
  31 ;   IN      UINT64                    CompareValue,
  32 ;   IN      UINT64                    ExchangeValue
  33 ;   );
  34 ;------------------------------------------------------------------------------
  35 InternalSyncCompareExchange64   PROC
  36     mov     rax, rdx
  37     lock    cmpxchg [rcx], r8
  38     ret
  39 InternalSyncCompareExchange64   ENDP
  40
  41     END