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SubjectRe: Switch APIC to driver model (and make S3 sleep with APIC on)

> > + set_fixmap_nocache(FIX_APIC_BASE, apic_phys); /* FIXME: this is needed for S3 resume, but why? */
> Intel recommends a strong uncacheable mapping otherwise it may exhibit
> undeterministic behaviour. Perhaps that could be it?

But... set_fixmp_nocache seems to only flip bits in page
tables... that should be nop after S3 because memory is preserved.

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