to how other KSEG-style pmaps (alpha, sh3, sh5) do.
Add a DIAGNOSTIC panic for KSEG1 addresses (nothing should touch
uncached memory, right?)
Clean up the the pmapdebug printfs a little too (athough with
more ugly #ifdef DEBUG bits of code).
XXX: should use DPRINTF() type printfs here.
Fixes panic running regress/sys/kern/umount on MIPS platforms
reported by Martin Husemann.
346a126e90