x86/boot: read APIC base from register

TrenchBoot / xen

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Closed krystian-hebel closed 5 months ago

krystian-hebel commented 5 months ago

Some CPUs don't use default APIC base. Address in MSR is always valid, and it is already read to test for x2APIC.

krystian-hebel commented 5 months ago

I've tested it on HP t630, but not on KGPE.