The reason I'm asking is that there are several errata [1] for the
Pentium Pro processor which affect control register CR4 and SMM.
In particular, errata 26 implies that CR4.PCE must not be set to
allow the RDPMC instruction in user-mode, and errata 56 implies
that all CR4 settings may be lost after transiting to and from SMM.
[1] Pentium Pro Processor Specification Update, January 1999.
Intel document number 242689-035.
/Mikael
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