TAB/space/indent cleanup.

x68k/intr.h: Put functions under _KERNEL so crash(8) can use this.

branches: 1.21.60;
Remove obsolete ssir stuff which was used for pre-5.0 softintr(9).

No visible problem on X68030.

branches: 1.20.30; 1.20.40; 1.20.46;
Unify splraiseipl(9) implementation among m68k ports,
discussed with tsutsui@ on port-m68k.

For x68k:
- export ipl2psl_table[] and make it uint16_t
- make makeiplcookie(9) inline
- put PSL_S bit into ipl2psl_table[] rather than adding it in makeiplcookie(9)
- define both IPL_SCHED and IPL_HIGH independently to avoid confusion

branches: 1.19.2;
Initialize IPL_SERIAL. Analysed by tsutsui@.
Fixed kern/38684 (and other many panics).

branches: 1.18.2;
Remove clause 3 and 4 from TNF licenses

branches: 1.17.14; 1.17.16; 1.17.18;
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: 1.16.16; 1.16.18; 1.16.24;
Remove #ifdef _KERNEL since this file is no longer exported.
Suggested by tsutsui@.

- 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: 1.14.2;
Hide #include <m68k/softintr.h> inside #ifdef _KERNEL in <machine/intr.h>
to avoid exporting unnecessary files to userland.
Should fix build.sh failure, which was pointed out by isaki@.

XXX: which userland program would require contents of <machine/intr.h>?

Add MI softintr(9) support for x68k with common m68k/softintr.c.
Tested by isaki@ and Yasushi Oshima.

XXX: x68k/dev/com.c should be rewritten to use MI com(4).

branches: 1.12.2;
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: 1.10.20; 1.10.22;
implement splraiseipl() for the following ports.
evbppc, evbmips, evbsh3, hp700, mac68k, vax, x68k.

branches: 1.9.8; 1.9.14;
de-__P, remove register, ansify.

branches: 1.8.8; 1.8.24; 1.8.32;
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: 1.7.2;
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.

Minor cleanups & corrections.

branches: 1.4.2;
Protect some declarations by #ifdef _KERNEL.

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.

Merged minoura_x68k_bus_h branch.

branches: 1.1.2;
Splitted out the interrupt handling code to a separate file.
Disallow getting down the interrupt level by splXX.