Does AMD support x2APIC?

Question

I'm a learner of OS, and trying to write a kernel.

I googled for "AMD x2APIC" and found out some of the information about EPYC 7002 series seems like to support it.

But I cannot find the relative documentation.

So I would like to ask if the recent AMD processors support it, and if yes, where I can find documentation.

Answer 1

Yes, the same as in Intel's CPUs.
You use cpuid (CPUID_Fn00000001_ECX) to check for it

and the Core::X86::Msr::APIC_BAR MSR to enable it:

Just like you would with Intel's CPUs.

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The x2APIC specification is here.