Re: [git pull] x86 fixes

H. Peter Anvin
2008-09-08T20:18:42Z

Arjan van de Ven wrote:
>
> I'd lump all cpus that don't have cpuid in this bucket too (eg half the
> 486es) simply because not having cpuid is painful in pretty much the
> same way.
>

Not really. Detecting CPUID is pretty trivial, and we just initialize
the feature vector to zero if it isn't there.

>> - "modern 32-bit": PPro and better. Can take CMOV, MMX and TSC for
>> granted.
>
> again makes sense; question is if it makes sense to take PSE and PAE
> for granted as well (although PSE we can do runtime I suppose)

Well, PAE implies PSE. Unfortunately Intel released a series of
Pentium-Ms without PAE support. We *should* be able to take PSE for
granted, but there is Xen damage.

-hpa