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| author | Yong Li <yong.li@intel.com> | 2023-04-20 12:36:40 +0800 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2023-06-06 20:37:18 +0000 |
| commit | ded0b489af09cde5afa05d74acdb12cd4b4f8394 (patch) | |
| tree | 8c7d57f12a2c40bf3f30f7050fbf15521bb067ae /MdePkg/Library | |
| parent | d189de3b0a2f44f4c9b87ed120be16569ea19b51 (diff) | |
| download | edk2-ded0b489af09cde5afa05d74acdb12cd4b4f8394.tar.gz edk2-ded0b489af09cde5afa05d74acdb12cd4b4f8394.tar.bz2 edk2-ded0b489af09cde5afa05d74acdb12cd4b4f8394.zip | |
MdePkg/BaseLib: Add SpeculationBarrier implementation for RiscV64
Implement the SpeculationBarrier with implementations consisting of
fence instruction which provides finer-grain memory orderings.
Perform Data Barrier in RiscV: fence rw,rw
Perform Instruction Barrier in RiscV: fence.i; fence r,r
More detail is in Appendix A: RVWMO Explanatory Material in
https://github.com/riscv/riscv-isa-manual
This API is first introduced in the below commits for IA32 and x64
https://github.com/tianocore/edk2/commit/d9f1cac51bd354507e880e614d11a1dc160d38a3
https://github.com/tianocore/edk2/commit/e83d841fdc2878959185c4c6cc38a7a1e88377a4
and below the commit for ARM and AArch64 implementation
https://github.com/tianocore/edk2/commit/c0959b4426b2da45cdb8146a5116bb4fd9b86534
This commit is to add the RiscV64 implementation which will be used by
variable service under Variable/RuntimeDxe
Cc: Andrei Warkentin <andrei.warkentin@intel.com>
Cc: Evan Chai <evan.chai@intel.com>
Cc: Sunil V L <sunilvl@ventanamicro.com>
Cc: Tuan Phan <tphan@ventanamicro.com>
Signed-off-by: Yong Li <yong.li@intel.com>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
Diffstat (limited to 'MdePkg/Library')
| -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
|