MdePkg/Library/BaseSynchronizationLib/X64/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     DEFAULT REL
  20     SECTION .text
  21
  22 ;------------------------------------------------------------------------------
  23 ; UINT16
  24 ; EFIAPI
  25 ; InternalSyncCompareExchange16 (
  26 ;   IN      volatile UINT16           *Value,
  27 ;   IN      UINT16                    CompareValue,
  28 ;   IN      UINT16                    ExchangeValue
  29 ;   );
  30 ;------------------------------------------------------------------------------
  31 global ASM_PFX(InternalSyncCompareExchange16)
  32 ASM_PFX(InternalSyncCompareExchange16):
  33     mov     ax, dx
  34     lock    cmpxchg [rcx], r8w
  35     ret
  36