Another alpha panic

[Alan L. Cox]

Kris Kennaway wrote:
> 
> Dump of assembler code for function pmap_activate:
> 0xfffffc00005cf0b0 <pmap_activate>:     ldah    gp,14(t12)
...
> 0xfffffc00005cf160 <pmap_activate+176>: srl     t1,0xd,t1
> 0xfffffc00005cf164 <pmap_activate+180>: stq     t1,16(t2)
...
I believe that the shift right is the "... >> PAGE_SHIFT" in

     td->td_pcb->pcb_hw.apcb_ptbr =
         ALPHA_K0SEG_TO_PHYS((vm_offset_t) pmap->pm_lev1) >> PAGE_SHIFT;

and the store quad is dereferencing "td->td_pcb".  In other words, 
td->td_pcb points to never-never land.

Alan