From 097aeeb119538a60f68355f1c3ac47df1834c90a Mon Sep 17 00:00:00 2001
From: Abner Chang <abner.chang@hpe.com>
Date: Wed, 21 Jul 2021 18:55:13 +0800
Subject: MdePkg/BaseLib: Add MemoryFence implementation for RiscV64

Cc: Abner Chang <abner.chang@hpe.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Signed-off-by: Daniel Schaefer <daniel.schaefer@hpe.com>
Reviewed-by: Abner Chang <abner.chang@hpe.com>
Acked-by: Liming Gao <gaoliming@byosoft.com.cn>
---
 MdePkg/Library/BaseLib/BaseLib.inf           |  3 ++-
 MdePkg/Library/BaseLib/RiscV64/MemoryFence.S | 22 ++++++++++++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)
 create mode 100644 MdePkg/Library/BaseLib/RiscV64/MemoryFence.S

diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf
index 6ccb8997b7..6efa5315b6 100644
--- a/MdePkg/Library/BaseLib/BaseLib.inf
+++ b/MdePkg/Library/BaseLib/BaseLib.inf
@@ -4,7 +4,7 @@
 #  Copyright (c) 2007 - 2021, Intel Corporation. All rights reserved.<BR>
 #  Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
 #  Portions copyright (c) 2011 - 2013, ARM Ltd. All rights reserved.<BR>
-#  Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+#  Copyright (c) 2020 - 2021, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
 #
 #  SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -401,6 +401,7 @@
   RiscV64/DisableInterrupts.c
   RiscV64/EnableInterrupts.c
   RiscV64/CpuPause.c
+  RiscV64/MemoryFence.S             | GCC
   RiscV64/RiscVSetJumpLongJump.S    | GCC
   RiscV64/RiscVCpuBreakpoint.S      | GCC
   RiscV64/RiscVCpuPause.S           | GCC
diff --git a/MdePkg/Library/BaseLib/RiscV64/MemoryFence.S b/MdePkg/Library/BaseLib/RiscV64/MemoryFence.S
new file mode 100644
index 0000000000..cc81683692
--- /dev/null
+++ b/MdePkg/Library/BaseLib/RiscV64/MemoryFence.S
@@ -0,0 +1,22 @@
+//------------------------------------------------------------------------------
+//
+// MemoryFence() for RiscV64
+//
+// Copyright (c) 2021, Hewlett Packard Enterprise Development. All rights reserved.
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+//------------------------------------------------------------------------------
+
+.text
+.p2align 2
+
+ASM_GLOBAL ASM_PFX(MemoryFence)
+
+//
+// Memory fence for RiscV64
+//
+//
+ASM_PFX(MemoryFence):
+    fence  // Fence on all memory and I/O
+    ret
-- 
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