1 files changed, 31 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/RiscV64/CpuScratch.S b/MdePkg/Library/BaseLib/RiscV64/CpuScratch.S
new file mode 100644
index 0000000000..5492a500eb
--- /dev/null
+++ b/MdePkg/Library/BaseLib/RiscV64/CpuScratch.S
@@ -0,0 +1,31 @@
+//------------------------------------------------------------------------------
+//
+// CPU scratch register related functions for RISC-V
+//
+// Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+//------------------------------------------------------------------------------
+
+#include <Register/RiscV64/RiscVImpl.h>
+
+.data
+.align 3
+.section .text
+
+//
+// Set Supervisor mode scratch.
+// @param a0 : Value set to Supervisor mode scratch
+//
+ASM_FUNC (RiscVSetSupervisorScratch)
+    csrw CSR_SSCRATCH, a0
+    ret
+
+//
+// Get Supervisor mode scratch.
+// @retval a0 : Value in Supervisor mode scratch
+//
+ASM_FUNC (RiscVGetSupervisorScratch)
+    csrr a0, CSR_SSCRATCH
+    ret