jchandra 4478273e0a SMP support in n64.
- Enable KX and UX bits on CPU startup for non-boot CPUs
- Keep the KX bit when in userspace - XTLB handler needs it to access
  PCPU data
- revert r210638 partly - we don't need to enable KX on kernel entry
  now

Reviewed by:	jmallett, imp
2010-08-12 11:00:45 +00:00
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