merge kqueue branch into -current

kqueue provides a stateful and efficient event notification framework
currently supported events include socket, file, directory, fifo,
pipe, tty and device changes

merge kqueue branch into -current

kqueue provides a stateful and efficient event notification framework
currently supported events include socket, file, directory, fifo,
pipe, tty and device changes, and monitoring of processes and signals

kqueue is supported by all writable filesystems in NetBSD tree
(with exception of Coda) and all device drivers supporting poll(2)

based on work done by Jonathan Lemon for FreeBSD
initial NetBSD port done by Luke Mewburn and Jason Thorpe

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Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant st

Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant structure in device drivers.

- The new grammer ``device-major'' is introduced to ``files''.

device-major <prefix> char <num> [block <num>] [<rules>]

- All device major numbers must be listed up in port dependent majors.<arch>
by using this grammer.

- Added the new naming convention.
The name of the device switch must be <prefix>_[bc]devsw for auto-generation
of device switch tables.

- The backward compatibility of loading block/character device
switch by LKM framework is broken. This is necessary to convert
from block/character device major to device name in runtime and vice versa.

- The restriction to assign device major by LKM is completely removed.
We don't need to reserve LKM entries for dynamic loading of device switch.

- In compile time, device major numbers list is packed into the kernel and
the LKM framework will refer it to assign device major number dynamically.

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add RCSIDs

Split the envsys and watchdog parts of sysmon into their own
files.

Add a watchog timer framework to the system monitor.

Fix a couple of brain-o's in error cases, and use PCATCH for
the sysmon mutex wait.

Add a clearing-house pseudo-device for system monitoring devices
such as the LM78 and VT82C686A (and eventually ACPI). Multiple
sensor devices can be hooked registered with `sysmon', and eventually

Add a clearing-house pseudo-device for system monitoring devices
such as the LM78 and VT82C686A (and eventually ACPI). Multiple
sensor devices can be hooked registered with `sysmon', and eventually
sysmon will also handle hardware (and software) watchdog timers.

Convert the `lm' and `viaenv' drivers to the new interface.

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