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
Posted on 2005-04-06 17:02:59 by f0dder
Thanks. It is an interesting article.
Posted on 2005-04-07 12:12:13 by roticv
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.
Posted on 2005-04-13 02:26:06 by Pinczakko

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? :)
Posted on 2005-04-13 03:06:19 by f0dder