minor updates to make it more explicit that when using fpu_kern_thread,
you don't need to use fpu_kern_enter/_leave...

Reviewed by:	kib
puc(4): add an entry for the Oxford Semiconductor OXPCIe952 1S1P card.

Submitted by:	Alex Burlyga <alex.burlyga.ietf at gmail.com>
MFC after:	1 week
Test if 'env' is NULL before doing memset() and strlen(),
the caller may pass NULL to freeenv().
In selfdfree re-evaulate sf_si after takin the lock.

Otherwise we can race with doselwakeup.

This is a fixup to r273549

Reviewed by:	jhb
Reported by:	everyone and their dog
Use a static callout to drive key_timehandler() instead of timeout().
While here, make key_timehandler() private to key.c.

Submitted by:	bz (2)
Tested by:	bz
Under PAE ULONG is insufficient for representing the physical memory size.  Use QUAD
for "hw.physmem" so that a physical memory size greater than 4 GB can be specified
from the boot loader.