If you use sys/param.h, you don't need sys/types.h

Enter pxeboot, derived from the NetBSD implementation. Initially
intended to support network installs using bsd.rd over TFTP.

Thanks to the many who tested, including Diana Eichert.

ok deraadt@

ansification and knf and protos

probe for ps2 model and check if kbd controller is present
for deciding on a20 method to use.
based on csapuntz@'s info provided.

Timeout non-functional KBC (e.g. when missing) and gate A20 using port 0x92

Address the i8042 keyboard controller registers as offsets from IO_KBD; from
NetBSD. This will ease the pain when we bring in the pckbc MI keyboard
driver to be used for wscons/i386 and wscons/alpha.

Changes/updates to /boot stuff. More to come.
Fixes many divide by zero and pointer bugs.

proper includes

use dev/ic/i8042reg.h, not domestic defines

Initial /boot stuff (from Mickey)