Catch up with PHK's sio(4) rework [sys/dev/sio/sio.c rev. 1.456]. Also catch up with RCng.
Catch up with PHK's sio(4) rework [sys/dev/sio/sio.c rev. 1.456].
Also catch up with RCng.

Reviewed by:	phk

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase