MdePkg/Library/BaseLib/Arm/MemoryFence.S

   1 ##------------------------------------------------------------------------------
   2 #
   3 # MemoryFence() for AArch64
   4 #
   5 # Copyright (c) 2013, ARM Ltd. All rights reserved.
   6 #
   7 # This program and the accompanying materials
   8 # are licensed and made available under the terms and conditions of the BSD License
   9 # which accompanies this distribution.  The full text of the license may be found at
  10 # http://opensource.org/licenses/bsd-license.php.
  11 #
  12 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 #
  15 ##------------------------------------------------------------------------------
  16
  17 .text
  18 .p2align 2
  19
  20 GCC_ASM_EXPORT(MemoryFence)
  21
  22
  23 #/**
  24 #  Used to serialize load and store operations.
  25 #
  26 #  All loads and stores that proceed calls to this function are guaranteed to be
  27 #  globally visible when this function returns.
  28 #
  29 #**/
  30 #VOID
  31 #EFIAPI
  32 #MemoryFence (
  33 #  VOID
  34 #  );
  35 #
  36 ASM_PFX(MemoryFence):
  37     // System wide Data Memory Barrier.
  38     dmb
  39     bx   lr