Can’t find the pdf, but it’s all related to the zentool stuff: https://github.com/google/security-research/blob/master/pocs/cpus/entrysign/zentool/docs/intro.m

Can’t find the pdf, but it’s all related to the zentool stuff: https://github.com/google/security-research/blob/master/pocs/cpus/entrysign/zentool/docs/intro.md https://github.com/google/security-research/blob/master/pocs... Tavis spells it out there pretty quickly: “ The simplest instructions (add, sub, mov, etc) are all implemented in hardware. The more complicated instructions like rdrand, fpatan and cmpxchg are microcoded. You can think of them as a bit like calling into a library of functions written in that RISC-like code.”