convert all the sparc drivers that attach on my ss20 to use device_t,
cfdata_t and CFATTACH_DECL_NEW().

fd/fdc could use better testing, but i'm pretty sure i got it right.

#include <sys/bus.h> instead of <machine/bus.h>.

curlwp is never NULL any more.

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.

show more ...

Pass the correct (timer instead of stat counter) timer registers to timerattach().
History: This cleans up another long standing inconsistency where timerblurb for delay() was
calibrated against the

Pass the correct (timer instead of stat counter) timer registers to timerattach().
History: This cleans up another long standing inconsistency where timerblurb for delay() was
calibrated against the stat timer instead the clock timer. Before timecounters
this didn't matter at al as both timer run with the same frequency and the
calibration was a frequency based calibration.

Misbehaving clock found by Fanch (at) kekpar dot net on current-users@ - Thanks.
Fix verified to work by Fanch.

show more ...

convert to timecounters (from branch simonb-timecounters)

Drop trailing whitespace.

Avoid unnecessary stores of discarded values.

__KERNEL_RCSID()

Merge the nathanw_sa branch.

Fix compiler warning induced by last change.

statintr: if interrupting code running below IPL_SCHED, call schedintr()
directly, saving the overhead of an extra soft interrupt.

Move schedintr() to clock.c and initialise schedhz in initclocks(), so
these are available to all timer implementations.

Make the schedintr() code common for all timers.

Move timer{match,attach}_mainbus() back into timer.c, since the `timer at
mainbus' configuration declaration is orthogonal to the configured SUN4[CM]
platform options.

Add trailing ; to CFATTACH_DECL.

Use CFATTACH_DECL().

Declare all cfattach structures const.

Split the timer code up into Sun4/Sun4c, Sun4m, and MS-IIep bits, mostly
to make it more readable.