AMD updated: “AMD64 Architecture Programmer’s Manual Volume 2: System Programming” in July 2019. The last update was back in September 2018. Changes:
3.31 Added CLWB and WBNOINVD details.
Clarified FP error pointer save/restore behavior.
Corrected description of APIC Software Enable functionality.
Clarified canonical address checking behavior.
Clarified fault generation for instructions that cross page or segment boundaries.
Hastily-written news/info on the firmware security/development communities, sorry for the typos.
Firmware Security 