MdePkg/Library/BaseLib/Ia32/InterlockedCompareExchange32.S

   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 #   InterlockedCompareExchange32.Asm
  15 #
  16 # Abstract:
  17 #
  18 #   InternalSyncCompareExchange32 function
  19 #
  20 # Notes:
  21 #
  22 #------------------------------------------------------------------------------
  23
  24 .global _InternalSyncCompareExchange32
  25
  26 #------------------------------------------------------------------------------
  27 # UINT32
  28 # EFIAPI
  29 # InternalSyncCompareExchange32 (
  30 #   IN      UINT32                    *Value,
  31 #   IN      UINT32                    CompareValue,
  32 #   IN      UINT32                    ExchangeValue
  33 #   );
  34 #------------------------------------------------------------------------------
  35 _InternalSyncCompareExchange32:
  36     movl    4(%esp), %ecx
  37     movl    8(%esp), %eax
  38     movl    12(%esp), %edx
  39     lock
  40     cmpxchgl    %edx, (%ecx)
  41     ret