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-rw-r--r--MdePkg/Library/BaseLib/AArch64/SpeculationBarrier.S33
1 files changed, 33 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/AArch64/SpeculationBarrier.S b/MdePkg/Library/BaseLib/AArch64/SpeculationBarrier.S
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index 000000000000..96831b3b8256
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+++ b/MdePkg/Library/BaseLib/AArch64/SpeculationBarrier.S
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+##------------------------------------------------------------------------------
+#
+# SpeculationBarrier() for AArch64
+#
+# Copyright (c) 2019, Linaro Ltd. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##------------------------------------------------------------------------------
+
+.text
+.p2align 2
+
+GCC_ASM_EXPORT(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):
+ dsb sy
+ isb
+ ret