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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malloc(9) -> kmem(9)

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.

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

Remove trailing spaces.

Fix various build with the 32bit mips ports after the mips64 merge.

- Use uvm_lwp_setuarea() instead of directly setting address to lwp_t::l_addr.
- Replace most remaining uses of l_addr with uvm_lwp_getuarea() or lwp_getpcb().
- Amend assembly in ports where it acce

- Use uvm_lwp_setuarea() instead of directly setting address to lwp_t::l_addr.
- Replace most remaining uses of l_addr with uvm_lwp_getuarea() or lwp_getpcb().
- Amend assembly in ports where it accesses PCB via struct user.
- Rename L_ADDR to L_PCB in few places. Reduce sys/user.h inclusions.

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Define, and hook into the isa_chipset_tag_t, isabr_detach_hook().

Split device_t/softc with misc related changes.

Return a proper value from isabr_iointr() even in error path.

Fix spl(9) botch in cpu_intr() on arc:
Don't enable unhandled interrupts before all interrupts are processed,
and also change all interrupt handlers to return processed MIPS_INT_MASK
values, rather t

Fix spl(9) botch in cpu_intr() on arc:
Don't enable unhandled interrupts before all interrupts are processed,
and also change all interrupt handlers to return processed MIPS_INT_MASK
values, rather than masked values of them.

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Interrupt handling changes, in discussion since February:

- Reduce available SPL levels for hardware devices to none, vm, sched, high.
- Acquire kernel_lock only for interrupts at IPL_VM.
- Implemen

Interrupt handling changes, in discussion since February:

- Reduce available SPL levels for hardware devices to none, vm, sched, high.
- Acquire kernel_lock only for interrupts at IPL_VM.
- Implement threaded soft interrupts.

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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 v

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.

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Adapt to the new signature of callout_init().

Merge some of the less invasive changes from the vmlocking branch:

- kthread, callout, devsw API changes
- select()/poll() improvements
- miscellaneous MT safety improvements

Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

Use register macro defined in <dev/ic/i8259reg.h>.

Remove unused struct abus stuff.

Before calling the handler of timer at isa for hardclock(9),
clear MIPS_SR_INT_IE in struct clockframe status to prevent
unintentional spllowersoftclock(9) in hardclock(9).
This may be required becau

Before calling the handler of timer at isa for hardclock(9),
clear MIPS_SR_INT_IE in struct clockframe status to prevent
unintentional spllowersoftclock(9) in hardclock(9).
This may be required because current CLKF_BASEPRI() implementation
of NetBSD/arc doesn't check ICU_MASK and all ISA devices share
the same MIPS CPU INT2 interrupt.

BTW, has anyone tried IPL_ICU_MASK on any mips ports?

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Account ISA interrupts by evcnt(9)

- rename struct intrhand -> struct isa_intrhand
- remove unused ih_what member

Check whether the specified interrupt handler is valid before referring it.

Explicitly enable interrupts before softintr is handled as noted
in the TODO file. At least this fixes "sn0: receive buffers exhausted"
messages on my NEC-JC94.

XXX: does anyone know what "Dont reen

Explicitly enable interrupts before softintr is handled as noted
in the TODO file. At least this fixes "sn0: receive buffers exhausted"
messages on my NEC-JC94.

XXX: does anyone know what "Dont reenable" comment means, which was
XXX: there since initial import of pica (not arc).

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Use mips3_cp0_count_read() for precise microtime(9).

XXX microtime(9) function should be moved from machdep.c to timer.c?