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ded0b489af
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 x64d9f1cac51be83d841fdcand below the commit for ARM and AArch64 implementationc0959b4426This 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>