diff options
| -rw-r--r-- | MdePkg/Library/BaseLib/BaseLib.inf | 1 | ||||
| -rw-r--r-- | MdePkg/Library/BaseLib/RiscV64/SpeculationBarrier.S | 34 |
2 files changed, 35 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf index 3a48492b1a..03c7b02e82 100644 --- a/MdePkg/Library/BaseLib/BaseLib.inf +++ b/MdePkg/Library/BaseLib/BaseLib.inf @@ -404,6 +404,7 @@ RiscV64/CpuScratch.S | GCC
RiscV64/ReadTimer.S | GCC
RiscV64/RiscVMmu.S | GCC
+ RiscV64/SpeculationBarrier.S | GCC
[Sources.LOONGARCH64]
Math64.c
diff --git a/MdePkg/Library/BaseLib/RiscV64/SpeculationBarrier.S b/MdePkg/Library/BaseLib/RiscV64/SpeculationBarrier.S new file mode 100644 index 0000000000..581a765399 --- /dev/null +++ b/MdePkg/Library/BaseLib/RiscV64/SpeculationBarrier.S @@ -0,0 +1,34 @@ +##------------------------------------------------------------------------------
+#
+# SpeculationBarrier() for RISCV64
+#
+# Copyright (c) 2023, Intel Corporation. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##------------------------------------------------------------------------------
+
+.text
+.p2align 2
+
+ASM_GLOBAL ASM_PFX(SpeculationBarrier)
+
+
+#/**
+# Uses as a barrier to stop speculative execution.
+#
+# Ensures that no later instruction will execute speculatively, until all prior
+# instructions have completed.
+#
+#**/
+#VOID
+#EFIAPI
+#SpeculationBarrier (
+# VOID
+# );
+#
+ASM_PFX(SpeculationBarrier):
+ fence rw,rw
+ fence.i
+ fence r,r
+ ret
|