centralize setdisklabel(9)

Merge vmlocking2 to head.

branches: 1.26.2; 1.26.4; 1.26.8;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

Merge brelse() changes from the vmlocking branch.

branches: 1.24.8; 1.24.16; 1.24.26; 1.24.28; 1.24.30;
Replace the myriad copies of bounds_check_with_label() with a single MI
version.

Add disk_blocksize(9) so that disk drivers can record the physical
block size of a disk if it is different to DEV_BSIZE. Right now this
simply initialises dk_blkshift and dk_byteshift according to the
supplied block size. This information is used in the MI version of
bounds_check_with_label().

branches: 1.23.20; 1.23.22;
merge ktrace-lwp.

branches: 1.22.2;
Add a const.

- make readdisklabel(9) return more usable default label
if disk doesn't have disklabel (sync with news68k)
- most hp300 machines have a boot patition and partition a doesn't
start at 0, so RAW_PART should be used in bounds_check_with_label(9)
- remove unneeded <sys/syslog.h>
- remove b_cylinder definition, which is in <sys/buf.h>
- some other cosmetics

Use ANSI function decls, static, and const.

TAB/space cleanup.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.17.2;
Include <sys/disk.h>.

Change bounds_check_with_label() to take a pointer to the disk structure,
rather than the label itself. This paves the way for some future changes.

Change return type of readdisklabel() to const char *
I hope I've found all the correct places!

Add RCSIDs.

Don't cast argument to ffs() to long.
Per discussion on port-alpha, noticed by Robert Elz.

strategy should have an 'r'. Inspired by similar change in OpenBSD.

branches: 1.11.2; 1.11.4; 1.11.8;
In the provisional disklabel (which will be used if there is no
valid on-device disk label), set d_npartitions to RAW_PART+1 instead
of to 1. Discovered as a build bug on the netbsd-1-5 branch, affecting
miniroot construction and vnd devices; RAW_PART went missing from the
in-core disklabel, and eventually also the on-device label.

branches: 1.10.2;
rationalize the use of b_flags for geteblk() buffers.
rather than assigning to the whole field, set or clear individual flags,
which implies that the B_BUSY and B_INVAL flags will remain set.
this allows us to make the assertion in brelse() that B_BUSY is set,
which is the purpose of all this.

branches: 1.9.22; 1.9.28; 1.9.32;
Add prototypes, and make this compile with -Wall. Remove register
modifier from all declarations.

Use DISKUNIT()/DISKPART() from <sys/disklabel.h> instead of
our own home-grown versions.

Fix #includes.

Add bounds_check_with_label().

new RCS ID format.

Liten up.

Get rid of indirection, and change return type of strat functions.

add rcsids to everything and clean up headers

First cut at cpu independent disklabels.
There will be niggly little details no doubt..