CVS log for src/sys/arch/usermode/usermode/intr.c

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Keyword substitution: kv
Default branch: MAIN

sync with head

merge to -current.

Complete rewrite of the signal and spl framework for NetBSD/usermode

Signals are now moved from the sigaltstack ASAP and stacked on a replacement
stack for each processes.

Preemption now works though could be enhanced a bit more

If the spl list is full also notify on the ttycons since it might otherwise
not allways be possible to print the panic correctdue due to the spl level.

increase the max # of sigio handlers

double SIGIO_MAX_HANDLERS

make sure the sigio signal handler runs on the alternate signal stack,
fixes random SIGILLs seen recently

add sigio_intr_establish so more than one driver can register a SIGIO handler

Disable spl_intr() spamming when debug printing is enabled.

Allthough in normal practice at most two are queued, with all the debug info
spounting outi, a lot can get queued in the first phase of kernel startup.
especially the clock.

Move to dprintf_debug()

Keep processing since we *might* have missed one during execution

Implement spl level based priority interrupt controller in software

add heavyweight sigprocmask stuff, commented out unless INTR_USE_SIGPROCMASK
is defined

remove thunk_sigblock/thunk_sigunblock calls

make sure splraise doesn't lower spl, and spllower doesn't raise it

implement splraise/spllower