I bet you thought the information returned by CPUID was hardcoded into the CPU, right? Well, not entirely so... have a look at http://f0dder.reteam.org/amdp4.htm
Thanks. It is an interesting article.
he..he..he.. another MSRs stuff. Anyway, P3 allow us to write directly into their cache by using MSRs too. Lots of cool and weird thing can happen by manipulating MSRs.
Anyway, P3 allow us to write directly into their cache by using MSRs too.
Used by BIOSes to be able to do CALLs from ROM code, and (ab)used by the XBOX to prevent finding the decryption key by doing a RAM snoop, right? :)