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Microcode is an abstraction layer used by modern x86 processors that interprets user-visible CISC instructions to hardware-internal RISC instructions. The capability to update x86 microcode enables a vendor to modify CPU behavior in-field, and thus patch erroneous microarchitectural processes or even implement new features. Most prominently, the recent Spectre and Meltdown vulnerabilities were mitigated by Intel via microcode updates. Unfortunately, microcode is proprietary and closed source,arXiv:2007.03549v1 fatcat:leas2d23yve7ldwmdjxxhg3cby