MdePkg/Library/BaseLib/Arm/MemoryFence.S

   1 ##------------------------------------------------------------------------------
   2 #
   3 # MemoryFence() for AArch64
   4 #
   5 # Copyright (c) 2013, ARM Ltd. All rights reserved.
   6 #
   7 # SPDX-License-Identifier: BSD-2-Clause-Patent
   8 #
   9 ##------------------------------------------------------------------------------
  10
  11 .text
  12 .p2align 2
  13
  14 GCC_ASM_EXPORT(MemoryFence)
  15
  16
  17 #/**
  18 #  Used to serialize load and store operations.
  19 #
  20 #  All loads and stores that proceed calls to this function are guaranteed to be
  21 #  globally visible when this function returns.
  22 #
  23 #**/
  24 #VOID
  25 #EFIAPI
  26 #MemoryFence (
  27 #  VOID
  28 #  );
  29 #
  30 ASM_PFX(MemoryFence):
  31     // System wide Data Memory Barrier.
  32     dmb
  33     bx   lr