1 files changed, 32 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseLib/AArch64/SpeculationBarrier.asm b/roms/edk2/MdePkg/Library/BaseLib/AArch64/SpeculationBarrier.asm
new file mode 100644
index 000000000..cafbe2bf2
--- /dev/null
+++ b/roms/edk2/MdePkg/Library/BaseLib/AArch64/SpeculationBarrier.asm
@@ -0,0 +1,32 @@
+;------------------------------------------------------------------------------
+;
+; SpeculationBarrier() for AArch64
+;
+; Copyright (c) 2019, Linaro Ltd. All rights reserved.
+;
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+;------------------------------------------------------------------------------
+
+  EXPORT SpeculationBarrier
+  AREA BaseLib_LowLevel, CODE, READONLY
+
+;/**
+;  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
+;  );
+;
+SpeculationBarrier
+    dsb   sy
+    isb
+    ret
+
+  END