apic_enumerator: only set mp_ncpus and mp_maxid at probe cpus phase

[royger]

Summary

Populate the lapics arrays and call cpu_add/lapic_create in the setup
phase instead. Also store the max APIC ID found in the newly
introduced max_apic_id global variable.

This is a requirement in order to make the static arrays currently
using MAX_LAPIC_ID dynamic.

Sponsored by: Citrix Systems R&D

[kib]

sys/x86/include/apicvar.h

178

Add this to x86/include/x86_var.h ?

sys/x86/x86/mptable.c

480

I think that xAPIC constant should be used for mptable configs.

[royger]

Thanks.

sys/x86/x86/mptable.c

480

MAX_LAPIC_ID is set to 63 or 11 on the top of the file. I'm not sure it safe to expand it to 254 (xAPIC_MAX_APIC_ID).