On Fri, 11 Nov 2005, H. Peter Anvin wrote:
> I think the 486's that have CR4 are the same that have CPUID, and thus can be
> tested for by the presence of the ID flag.
That's correct; for our purposes a 486 that would implement CR4 but not
CPUID would not be interesting anyway, as we don't use CR4 elsewhere but
for features discovered through CPUID. And I don't think there's ever
been an implementation that had CPUID but no CR4.
Maciej
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