From aa51ba93a561ac0d8d3b0c999f873d781e372900 Mon Sep 17 00:00:00 2001 From: Harry Liebel Date: Fri, 28 Jun 2013 15:16:15 +0100 Subject: Add Memory fence for AArch64. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Harry Liebel Signed-off-by: Olivier Martin --- MdePkg/Library/BaseLib/AArch64/MemoryFence.S | 37 ++++++++++++++++++++++++++ MdePkg/Library/BaseLib/BaseLib.inf | 1 + 2 files changed, 38 insertions(+), 0 deletions(-) create mode 100644 MdePkg/Library/BaseLib/AArch64/MemoryFence.S diff --git a/MdePkg/Library/BaseLib/AArch64/MemoryFence.S b/MdePkg/Library/BaseLib/AArch64/MemoryFence.S new file mode 100644 index 0000000..2e6ca2c --- /dev/null +++ b/MdePkg/Library/BaseLib/AArch64/MemoryFence.S @@ -0,0 +1,37 @@ +##------------------------------------------------------------------------------ +# +# MemoryFence() for AArch64 +# +# Copyright (c) 2013, ARM Ltd. All rights reserved. +# This program and the accompanying materials +# are licensed and made available under the terms and conditions of the BSD License +# which accompanies this distribution. The full text of the license may be found at +# http://opensource.org/licenses/bsd-license.php. +# +# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +# +##------------------------------------------------------------------------------ + +.text +.p2align 2 +ASM_GLOBAL ASM_PFX(MemoryFence) + + +#/** +# Used to serialize load and store operations. +# +# All loads and stores that proceed calls to this function are guaranteed to be +# globally visible when this function returns. +# +#**/ +#VOID +#EFIAPI +#MemoryFence ( +# VOID +# ); +# +ASM_PFX(MemoryFence): + // System wide Data Memory Barrier. + dmb sy + ret diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf index 3e47b55..09f9f33 100644 --- a/MdePkg/Library/BaseLib/BaseLib.inf +++ b/MdePkg/Library/BaseLib/BaseLib.inf @@ -482,6 +482,7 @@ Arm/Unaligned.c Math64.c + AArch64/MemoryFence.S | GCC AArch64/SwitchStack.S | GCC AArch64/EnableInterrupts.S | GCC AArch64/DisableInterrupts.S | GCC -- 1.7.0.4