Add Memory fence for ARM Architecture (32 and 64 bit)

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14615 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseLib/AArch64/MemoryFence.S

@@ -0,0 +1,39 @@
+##------------------------------------------------------------------------------
+#
+# 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
+
+GCC_ASM_EXPORT(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

MdePkg/Library/BaseLib/Arm/MemoryFence.S

@@ -0,0 +1,39 @@
+##------------------------------------------------------------------------------
+#
+# 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
+
+GCC_ASM_EXPORT(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
+    bx   lr

MdePkg/Library/BaseLib/Arm/MemoryFence.asm

@@ -0,0 +1,39 @@
+;------------------------------------------------------------------------------
+;
+; 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.
+;
+;------------------------------------------------------------------------------
+
+    EXPORT MemoryFence
+
+    AREA MemoryBarriers, CODE, READONLY
+
+;/**
+;  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
+;  );
+;
+MemoryFence FUNCTION
+    dmb
+    bx      lr
+    ENDFUNC
+
+    END

MdePkg/Library/BaseLib/BaseLib.inf

@@ -468,6 +468,7 @@
   Arm/GetInterruptsState.asm | RVCT
   Arm/CpuPause.asm           | RVCT
   Arm/CpuBreakpoint.asm      | RVCT
+  Arm/MemoryFence.asm        | RVCT
  
   Arm/Math64.S                  | GCC
   Arm/SwitchStack.S             | GCC
@@ -476,12 +477,14 @@
   Arm/GetInterruptsState.S      | GCC
   Arm/SetJumpLongJump.S         | GCC
   Arm/CpuBreakpoint.S           | GCC
+  Arm/MemoryFence.S             | GCC
 
 [Sources.AARCH64]
   Arm/InternalSwitchStack.c
   Arm/Unaligned.c
   Math64.c
 
+  AArch64/MemoryFence.S             | GCC
   AArch64/SwitchStack.S             | GCC
   AArch64/EnableInterrupts.S        | GCC
   AArch64/DisableInterrupts.S       | GCC