MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
   4 ; Copyright (c) 2015, Linaro Ltd. All rights reserved.<BR>
   5 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   6 ;
   7 ; Module Name:
   8 ;
   9 ;   InterlockedCompareExchange16.Asm
  10 ;
  11 ; Abstract:
  12 ;
  13 ;   InterlockedCompareExchange16 function
  14 ;
  15 ; Notes:
  16 ;
  17 ;------------------------------------------------------------------------------
  18
  19     SECTION .text
  20
  21 ;------------------------------------------------------------------------------
  22 ; UINT16
  23 ; EFIAPI
  24 ; InternalSyncCompareExchange16 (
  25 ;   IN      volatile UINT16           *Value,
  26 ;   IN      UINT16                    CompareValue,
  27 ;   IN      UINT16                    ExchangeValue
  28 ;   );
  29 ;------------------------------------------------------------------------------
  30 global ASM_PFX(InternalSyncCompareExchange16)
  31 ASM_PFX(InternalSyncCompareExchange16):
  32     mov     ecx, [esp + 4]
  33     mov     ax, [esp + 8]
  34     mov     dx, [esp + 12]
  35     lock    cmpxchg [ecx], dx
  36     ret
  37