Move cn_tab initialization from late cpu_startup(9) to
early _bootstrap() in locore2.c.
Tested on TME emulating 2/120.

move console initialization to cpu_startup() so that we avoid multiple common.

Fix missing parenthesis in #ifdef notyet block. PR port-sun2/42524

merge ktrace-lwp.

Add const.

de-__P, remove register, ansify, b* -> mem*, u_int*_t -> uint*_t.

__KERNEL_RCSID()

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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Added bits to complete the sun2 console code. These are
virtually identical copies of files under sys/arch/sparc/dev,
and one day they will be merged under sys/dev/sun.