Fix up the mac68k interrupt handlers to work with the new style common
clockframe layout and remove the CLOCK_FORMAT0 work-around. As a nice
side-effect, this also eliminates the super-sketchy stack unwinding used
by rtclock_intr to get at the interrupt stack frame.

mac68k/intr.h: Expose ipl_cookie_t to _KMEMUSER for crash(8).

branches: 1.31.112;
Revert part of previous changes:
> make makeiplcookie() return PSL bits via ipl2psl_table[]
> rather than IPL_FOO indexes
because ipl2psl_table[] could be updated during autoconf(9)
and we can't use it as cookie before cpu_configure(9).

branches: 1.30.2;
Unify splraiseipl(9) implementation among m68k ports as per
suggestion from isaki@ on port-m68k.

For mac68k:
- rename mac68k_ipls[] to common ipl2psl_table[]
- make makeiplcookie() return PSL bits via ipl2psl_table[]
rather than IPL_FOO indexes

branches: 1.29.6; 1.29.10; 1.29.12; 1.29.14;
Remove unused splfoo() definitions.

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.

branches: 1.27.16; 1.27.18; 1.27.24;
- Shrink ipl_cookie_t from 32-bits to 16-bits (large enough to hold
an SR value or an IPL_* constant).
- Take advange of the smaller ipl_cookie_t to shrink kmutex_t from
16 bytes to 8 bytes by overlapping storage where possible.
- Implement a RAS-based _lock_cas() for mc68010 systems (Sun2). See
sun68k/sun68k/isr.c.

Tested on various m68k platforms, but NOT Sun2. In any case, at least
Sun2 compiles now.

branches: 1.26.2;
MI softintr(9)'fy.
Probably problematic, but LC630 is running at single user.

branches: 1.25.2;
Remove spllowersoftclock() and CLKF_BASEPRI(), and always dispatch callouts
via a soft interrupt. In the near future, softclock will be run from process
context.

merge yamt-splraiseipl branch.

- finish implementing splraiseipl (and makeiplcookie).
http://mail-index.NetBSD.org/tech-kern/2006/07/01/0000.html
- complete workqueue(9) and fix its ipl problem, which is reported
to cause audio skipping.
- fix netbt (at least compilation problems) for some ports.
- fix PR/33218.

branches: 1.23.20; 1.23.22;
Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.

implement splraiseipl() for the following ports.
evbppc, evbmips, evbsh3, hp700, mac68k, vax, x68k.

branches: 1.21.10; 1.21.16;
de-__P, remove register, ansify, b* -> mem*.

branches: 1.20.8; 1.20.24;
Remove the use of splimp() from the NetBSD kernel. splnet()
and only splnet() is allowed for the protection of data structures
used by network devices.

branches: 1.19.2;
Make sure everybody has an splvm() and equate it with splimp() (splimp()
is the historical name for this interrupt level, and the historical name
is going to go away in the near future).

Add spllock(). See spl(9) for details.

Change the behavior of spladb() so that it raises the IPL only
high enough to block ADB interrupts.

branches: 1.16.2; 1.16.4; 1.16.8;
Change the semantics of splsoftclock() to be like other spl*() functions,
that is priority is rasied. Add a new spllowersoftclock() to provide the
atomic drop-to-softclock semantics that the old splsoftclock() provided,
and update calls accordingly.

This fixes a problem with using the "rnd" pseudo-device from within
interrupt context to extract random data (e.g. from within the softnet
interrupt) where doing so would incorrectly unblock interrupts (causing
all sorts of lossage).

XXX 4 platforms do not have priority-raising capability: newsmips, sparc,
XXX sparc64, and VAX. This platforms still have this bug until their
XXX spl*() functions are fixed.

Use an array for PSL values, rather than individual shortwords, like
the hp300 port.

Slightly rearrange the SSIR inline assembly implementation in order to avoid
making assumptions on C symbol name prefixes.

branches: 1.13.2; 1.13.6;
Move all IPL setup to intr.c, and do some sanity checking.

Fix a typo in the (unused!) splsched() macro.

The return value from intr_dispatch() is no longer necessary.

Implement splaudio().

New framework for handling processor interrupts, derived in part from
the hp300 port.

- Interrupts 3-6 use this immediately. Interrupt 7 is a special case,
and the VIA interrupts (1 and 2) will be addressed when that code is
rototilled.

- Modify the zs front end to register with the appropriate interrupt
controller: through the PSC on the AV Quadras, and direct to
interrupt 4 on the rest. Arrange to have the appropriate zsc_softc
supplied to us at interrupt time.

- Modify the direct ADB driver (and its PowerManager cousin) to call
intr_dispatch(), rather than zshard(). XXX This is a kludge, but at
least limits the brokenness to the ADB drivers, now.

As a side effect, this should fix PR 5590. Thanks to Bill Studenmund for
correctly determining the cause of the problem reported there.

Update from John Wittkoski: bug fixes for Cuda support.

Add in the if_mc ethernet driver for the AMD "MACE" part. This is the
internal ethernet on the Quadra/Centris 660av/840av.
Add initial support for the PSC (DMA controller) to support the above
(DMA SCSI remains unsupported). This involved also changing the way
that several interrupts are handled.
Above from David Huang <khym@bga.com>
Since the interrupts changed somewhat, we must also make the ipls
dynamic, defaulting to their prior levels and adjusted for the AVs.
I modelled this on the hp300.

branches: 1.6.2;
Remove advertising clause.

Drop splsched() to spl3(), so that it no longer blocks serial interrupts.

branches: 1.4.2;
New implementation of _splraise(): use word-length operands where possible
by implementing entirely in assembly. This saves some 6 bytes on all MPUs,
and about 8 cycles on the 030.

Now that it's optimized, define spltty() in terms of _splraise() so that
we don't inadvertantly lower the SPL.

Add en implementation of the Deferred Task Manager, contributed by Paul
Goyette <paul@pgoyette.bdt.com>.

Add copyright notice.

Move all splxxx() and softint-related macros and prototypes to intr.h,
and include it where appropriate.