fix typos in comments.

s/static inline/static __inline/g for consistency.

branches: 1.21.16;
Add a dummy splraiseipl()

branches: 1.20.6;
Make IPL_ values different.
This makes ni real difference for rump, but avoods
KASSERTs in common code when we try to assert
"ipl not higher as...".
Suggested by riastradh, OK: pooka.

branches: 1.19.2;
Provide splsoftserial.

GRRR RUMP

branches: 1.18.4; 1.18.10; 1.18.14; 1.18.16;
Update copyright statements.

no functional change.

branches: 1.17.2;
Make IPLs not equal IPL_NONE to avoid some KASSERTs.

branches: 1.16.4; 1.16.6;
Rip out the rwlock spl emulation code. It never did anything useful
except keep my feet warm by consuming an insane amount of cpu
cycles -- in rump our current "cpu" context is never interrupted
& we have MULTIPROCESSOR.

(itch i'm scratching: it made the networking stack 10-20% slower.
this is one of the places where fast code actually matters)

Define IPL_SOFTSERIAL and provide a makeiplcookie() implementation,
so that kern/subr_pool.c can build again.

OK'ed by martin@

Assemble with _LOCORE.

printf needs IPL_HIGH

Add a few symbols required by nfsd

branches: 1.11.2;
+IPL_SOFTNET

Add IPL_SOFTCLOCK, something required it (although I can't quite
recall what, this has been floating in my tree for a while)

branches: 1.9.6; 1.9.10; 1.9.12; 1.9.16;
Use vfs_subr.c from sys/kern. This brings differences in the vnode
life cycle between rump and a real kernel to a minimum.

Merge vmlocking2 to head.

branches: 1.7.2; 1.7.6;
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.

Emulate spls by using pthread rwlocks: splfoo() takes a read lock
and when doing processing in an interrupt (effectively when calling
biodone()), we take the write lock.

Define ipl_cookie_t, ipl_t.

branches: 1.4.2; 1.4.4;
"Support" splhigh(), requested by reinoud. But the spl emulation
code needs to be actually written soon ...

branches: 1.3.4;
Define splclock() so that this will at least compile on architectures
without _HAVE_TIMECOUNTER.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8;
interrupt headers necessary for vfs_bio

branches: 1.1.2;
Introduce RUMPs - Runnable Userspace Meta-Programs

/sys/rump contains programs which run unmodified kernel code in an
emulated userspace environment. The kernel environment is provided
by librump. Currently supported are a number of file systems,
which by using puffs integrate seamlessly into the system and
provide a similar user experience to if the code was running as
part of the kernel. Potential future rumpification targets include
for example parts of the networking stack and some device drivers.

This work was supported by Google Summer of Code 2007.