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 ; 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 ; Module Name:
  14 ;
  15 ;   InterlockedCompareExchange16.Asm
  16 ;
  17 ; Abstract:
  18 ;
  19 ;   InterlockedCompareExchange16 function
  20 ;
  21 ; Notes:
  22 ;
  23 ;------------------------------------------------------------------------------
  24
  25     DEFAULT REL
  26     SECTION .text
  27
  28 ;------------------------------------------------------------------------------
  29 ; UINT16
  30 ; EFIAPI
  31 ; InterlockedCompareExchange16 (
  32 ;   IN      volatile UINT16           *Value,
  33 ;   IN      UINT16                    CompareValue,
  34 ;   IN      UINT16                    ExchangeValue
  35 ;   );
  36 ;------------------------------------------------------------------------------
  37 global ASM_PFX(InternalSyncCompareExchange16)
  38 ASM_PFX(InternalSyncCompareExchange16):
  39     mov     ax, dx
  40     lock    cmpxchg [rcx], r8w
  41     ret
  42