MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange32.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;   InterlockedCompareExchange32.Asm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   InterlockedCompareExchange32 function
  13 ;
  14 ; Notes:
  15 ;
  16 ;------------------------------------------------------------------------------
  17
  18     SECTION .text
  19
  20 ;------------------------------------------------------------------------------
  21 ; UINT32
  22 ; EFIAPI
  23 ; InternalSyncCompareExchange32 (
  24 ;   IN      volatile UINT32           *Value,
  25 ;   IN      UINT32                    CompareValue,
  26 ;   IN      UINT32                    ExchangeValue
  27 ;   );
  28 ;------------------------------------------------------------------------------
  29 global ASM_PFX(InternalSyncCompareExchange32)
  30 ASM_PFX(InternalSyncCompareExchange32):
  31     mov     ecx, [esp + 4]
  32     mov     eax, [esp + 8]
  33     mov     edx, [esp + 12]
  34     lock    cmpxchg [ecx], edx
  35     ret
  36