Merge thorpej-cfargs2.

branches: 1.22.8;
Merge thorpej-cfargs branch:

Simplify and make extensible the config_search() / config_found() /
config_attach() interfaces: rather than having different variants for
which arguments you want pass along, just have a single call that
takes a variadic list of tag-value arguments.

Adjust all call sites:
- Simplify wherever possible; don't pass along arguments that aren't
actually needed.
- Don't be explicit about what interface attribute is attaching if
the device only has one. (More simplification.)
- Add a config_probe() function to be used in indirect configuiration
situations, making is visibly easier to see when indirect config is
in play, and allowing for future change in semantics. (As of now,
this is just a wrapper around config_match(), but that is an
implementation detail.)

Remove unnecessary or redundant interface attributes where they're not
needed.

There are currently 5 "cfargs" defined:
- CFARG_SUBMATCH (submatch function for direct config)
- CFARG_SEARCH (search function for indirect config)
- CFARG_IATTR (interface attribte)
- CFARG_LOCATORS (locators array)
- CFARG_DEVHANDLE (devhandle_t - wraps OFW, ACPI, etc. handles)

...and a sentinel value CFARG_EOL.

Add some extra sanity checking to ensure that interface attributes
aren't ambiguous.

Use CFARG_DEVHANDLE in MI FDT, OFW, and ACPI code, and macppc and shark
ports to associate those device handles with device_t instance. This
will trickle trough to more places over time (need back-end for pre-OFW
Sun OBP; any others?).

branches: 1.21.2;
malloc(9) -> kmem(9)

branches: 1.20.50;
split device_t/softc for all remaining drivers.
replace "struct device *" with "device_t".
use device_xname(), device_unit(), etc.

branches: 1.19.54; 1.19.64;
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.

Pack all global video-related variables into a structure for clarity.

A comment said that they weren't in a struct for speed reasons but...
this should not affect performance because these variables are mostly
used to set other variables (hence they are read few times).

Move the definition of multiple video-related variables into a new
header file (machine/video.h) so that we can kill all the "manual"
externs spread around the code (which were inconsistent among them).

Split the global videosize variable into videowidth and videoheight:
makes the code clearer and avoids multiple parts of it having to know
how videosize was encoded.

branches: 1.15.2; 1.15.10; 1.15.14; 1.15.18; 1.15.20;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.14.14;
Add an extra cookie to the ioctl and mmap wsdisplay accessops that points
to the screen on which they are being called. The driver cannot guess
this by itself but it is needed to implement, at least, the getwschar and
putwschar functions in the correct place. There are no functional changes
yet.

Tested on i386 (vga, vga_raster, machfb, vesafb), macppc and sparc64.
Suggested and reviewed by macallan@.

Use device_unit().

branches: 1.12.4; 1.12.6; 1.12.8; 1.12.10; 1.12.12;
merge ktrace-lwp.

branches: 1.11.10;
de-__P, remove register, ansify, b* -> mem*.

__KERNEL_RCSID()

branches: 1.9.6;
Use CFATTACH_DECL().

Declare all cfattach structures const.

alloc_attr -> allocattr

Approved by Matthias Drochner.

branches: 1.6.4;
Convert ioctl code to use EPASSTHROUGH instead of -1 or ENOTTY for
indicating an unhandled "command". ERESTART is -1, which can lead to
confusion. ERESTART has been moved to -3 and EPASSTHROUGH has been
placed at -4. No ioctl code should now return -1 anywhere. The
ioctl() system call is now properly restartable.

branches: 1.5.4; 1.5.8;
Replace the call to macfb_init() when attaching a non-console fb device
with a call to macfb_clear().

[The purpose of macfb_init() is almost exclusively to initialize the
raster console blitter. We really, really do not want to do this unless
we are actually initializing the console device, else we'll give rcons
the attributes of the last-seen fb device. These will not necessarily
correspond to the attributes of the actual console device!]

Change the kernel mmap interface so that the offset to map is an
"off_t" and the return value is a "paddr_t" to allow mappings
at offsets past 2^31 bytes. Somewhat inspired by FreeBSD, which
only changed the offset to a "vm_offset_t".

Includes updates for the i386, pc532 and sh3 mmmmap from Jason Thorpe.

branches: 1.3.4;
Resurrect a chunk of code from the ite driver that we lost along the way.
This code is necessary for SE/30 internal video, at a minimum.

Merge wscons work onto the main development branch.

branches: 1.1.2; 1.1.4;
file macfb.c was initially added on branch scottr-mac68k-wscons.