[LinuxBIOS] APICID lifting

Eric W. Biederman ebiederman at lnxi.com
Wed Oct 26 19:18:10 CEST 2005

Stefan Reinauer <stepan at openbios.org> writes:

> * Eric W. Biederman <ebiederman at lnxi.com> [051026 18:52]:
>> The best way is to get buggy software fixed.  So lifting the apic
>> id on the boot cpu will help find those bugs sooner, so they get
>> fixed.  
> While this is philosophically true, it sounds like those "well, works
> with fuctory bios, so linuxbios is broken" kind of thing.

Could be.  But it works with the latest kernels as well, so it is
easy enough to diagnose.

> Especially since having the boot cpu on apic id 0 is not particularly
> wrong.

Until you hit the board with 15 or 16 ioapics.

Getting a model that covers everything is painful.  If we need
to touch this again we really need a function that takes a node_core_id
and returns an apicid.   Then set it up so we have a reasonable default
version of that function but it can be overridden per motherboard.

OTOH if we don't run into the pain that would trigger this, we can
stay where we are.


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