Re: port-amd64/38478: panic on boot when attaching cpu17

["Christoph Egger" <Christoph_Egger%gmx.de@localhost>]

>  > cpu17 at mainbus0 apid 34
>  > panic: cpu at apic id 34 already attached?
>  
>  The code does not handle APIC IDs > 31 yet. Perhaps we should
>  look at modifying usr/include/bitstring.h to work on 32 bit
>  quantities, and to do atomic operaitons. As a start I think we
>  should stop using the APIC ID to identify CPUs for pure software
>  operations.

Further, CPU enumeration via ACPI are different on some BIOSes
in the world. We need a APIC <-> ACPI mapping table and
use ACPI IDs for ACPI operations.

-- 

Christoph