Zachary Amsden wrote:

>PnP BIOS for x86 is part of drivers, so I missed it in the initial
>GDT page alignment patch.  Kudos to Andrew for fixing that.
>Unfortunately, fixing the build introduced a kernel panic when
>trying to setup the as of yet unallocated GDTs for the APs.
>This fixes the problem by setting only the BSP's GDT, then copying
>the PnP segments back to the cpu_gdt_table template.
>
>  
>

Bogus patch!  I was just getting lucky and not running PnP BIOS code on 
the AP's -- until now.  Turns out the fix and the bug were much 
simpler.  Please apply this instead.