MdePkg/Library/BaseLib/Ia32/InterlockedCompareExchange64.c

   1 /** @file
   2   InterlockedCompareExchange64 function
   3
   4   Copyright (c) 2006 - 2007, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 UINT64
  16 EFIAPI
  17 InternalSyncCompareExchange64 (
  18   IN      UINT64                    *Value,
  19   IN      UINT64                    CompareValue,
  20   IN      UINT64                    ExchangeValue
  21   )
  22 {
  23   _asm {
  24     mov     esi, Value
  25     mov     eax, dword ptr [CompareValue + 0]
  26     mov     edx, dword ptr [CompareValue + 4]
  27     mov     ebx, dword ptr [ExchangeValue + 0]
  28     mov     ecx, dword ptr [ExchangeValue + 4]
  29     lock    cmpxchg8b   qword ptr [esi]
  30   }
  31 }