MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange64.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 ;   InterlockedCompareExchange64.Asm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   InterlockedCompareExchange64 function
  13 ;
  14 ; Notes:
  15 ;
  16 ;------------------------------------------------------------------------------
  17
  18     DEFAULT REL
  19     SECTION .text
  20
  21 ;------------------------------------------------------------------------------
  22 ; UINT64
  23 ; EFIAPI
  24 ; InternalSyncCompareExchange64 (
  25 ;   IN      volatile UINT64           *Value,
  26 ;   IN      UINT64                    CompareValue,
  27 ;   IN      UINT64                    ExchangeValue
  28 ;   );
  29 ;------------------------------------------------------------------------------
  30 global ASM_PFX(InternalSyncCompareExchange64)
  31 ASM_PFX(InternalSyncCompareExchange64):
  32     mov     rax, rdx
  33     lock    cmpxchg [rcx], r8
  34     ret
  35