Merge thorpej-cfargs2.

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 a

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?).

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BUS_SPACE_MAP_PREFETCHABLE yields a write combining region on x86 and that's
not what I intended.. BUS_SPACE_MAP_CACHEABLE is enough.

Map the video RAM cacheable/prefetchable, it's very slow and this helps a bit.

in many device attach paths, allocate memory with M_WAITOK instead of M_NOWAIT
and remove code to handle failures that can no longer happen.

Also unmap video memory when detaching console

remove BIOS-mapping code that was #if-0'd in the previous commit.

#if 0 code to map the VGA BIOS
I've been unable to find any code that actually uses the mapping and we may
want to read the ROM from drm2.
If no users show up within a week or so I'll delete it.

detach wscons when detaching console

mark variables __diagused

Make internal functions static

Reset flip/flop using dedicated vga_reset_state() macro we already have.
Explicit vga_raw_read() used here before was incorrect since it reads
from *wrong* io handle!

Fixes weird problem under Virtu

Reset flip/flop using dedicated vga_reset_state() macro we already have.
Explicit vga_raw_read() used here before was incorrect since it reads
from *wrong* io handle!

Fixes weird problem under VirtualBox where first switch to a different
VT caused text mode color 0 (normally black) to become something else.

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wsfont_matches() and wsfont_find() take an extra parameter now

add support for the interesting parts of ISO-2 and KOI8-R fonts
to the vga(4) driver

PR/41415: IdOp: Implement save and restore palette for vga.

If PCDISPLAY_SOFTCURSOR is defined, disable the hardware cursor on resume.

Add default implementations for bus_space_is_equal(9),
bus_space_tag_create(9), and bus_space_tag_destroy(9). Use
bus_space_is_equal(9) throughout the kernel to compare
bus_space_tag_t's. Tested on

Add default implementations for bus_space_is_equal(9),
bus_space_tag_create(9), and bus_space_tag_destroy(9). Use
bus_space_is_equal(9) throughout the kernel to compare
bus_space_tag_t's. Tested on i386 and on sparc64.

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pckbc.c, vga.c: It doesn't appear to be helpful to compare two
bus_space_tag_t's in pckbc_is_console() and vga_is_console(), and MI
code should never do such a thing, so don't do it.

tcic2.c

pckbc.c, vga.c: It doesn't appear to be helpful to compare two
bus_space_tag_t's in pckbc_is_console() and vga_is_console(), and MI
code should never do such a thing, so don't do it.

tcic2.c: #if 0 some diagnostic code that compares two bus_space_tag_t's.

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retire our private definitions for the scan1/3/5/7/9 DEC graphics
symbols, use the unicode definitions instead (which apparently didn't
exist when I wrote that)

Remove vesafb-specific hacks.

Always deviter_release().

In vga_is_console(), use deviter_first/_next() and device_t accessors.
Ok cube@.

Split device_t and softc for all attachments of vga(4).

Merge jmcneill-pm branch.

machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h