G/C

Hopefully fix some problems seen with MP support on non-x86, in particular
where curcpu() is defined as curlwp->l_cpu:

- mi_switch(): undo the ~2007ish optimisation to unlock curlwp before
calling cpu_switchto(). It's not safe to let other actors mess with the
LWP (in particular l->l_cpu) while it's still context switching. This
removes l->l_ctxswtch.

- Move the LP_RUNNING flag into l->l_flag and rename to LW_RUNNING since
it's now covered by the LWP's lock.

- Ditch lwp_exit_switchaway() and just call mi_switch() instead. Everything
is in cache anyway so it wasn't buying much by trying to avoid saving old
state. This means cpu_switchto() will never be called with prevlwp ==
NULL.

- Remove some KERNEL_LOCK handling which hasn't been needed for years.

branches: 1.53.2; 1.53.8;
Extract M_DATA, M_LEN, M_NEXT.

branches: 1.52.8;
Update copyright notice for Ludd (remove clause 3 & 4).

branches: 1.51.6; 1.51.24;
In the syscall vector, deal with SYS_lwp_getprivate quickly. XXX what about
non-NetBSD syscall tables.

branches: 1.50.4; 1.50.8;
Add L_PRIVATE

G/C unused MUTEX_COUNT_BIAS (it was for VAX)

branches: 1.48.2;
Move counting of faults, traps, intrs, soft[intr]s, syscalls, and nswtch
from uvmexp to per-cpu cpu_data and move them to 64bits. Remove unneeded
includes of <uvm/uvm_extern.h> and/or <uvm/uvm.h>.

Implement CAS using a RAS for non-MP VAX systems. This technique uses the
atomicity of indirect addressing for correctness. It also uses the knowledge
of dereferencing an address outside the page table length will cause a PTELEN
trap. [Tested on netbsd-5]

Add PSL_HIGHIPL for recent subr.S change

fix copy{in,out}{,str}() to return the error returned by uvm_fault().
fixes PR 41813.

branches: 1.44.2; 1.44.4;
Rename L_ADDR to L_PCB and amend some comments accordingly.

Remove ref to uvm.page_idle_zero

branches: 1.42.2; 1.42.4; 1.42.6;
A number of performance changes:
Change internal register SSP to contain curlwp insread curcpu(). This
shrinks the GENERIC by 2KB.
Add rwlock stubs (rw_enter, rw_exit, rw_tryenter).
Simplify simple lock code for uniprocessors.
Do SPL raise/lower in cpu_handle_ipi instead of simple_locks.

Switch NetBSD/vax to the CAS model of mutexes. Fix the locking primitives
in lock_stubs.S so they actually function correctly.

branches: 1.40.2; 1.40.6;
More softint fixes. We need to restore the softint lwp's pcb to it's initial
state since it may have been blocked or interrupted by another softint.

Make NetBSD/vax work again. Add support for __HAVE_FAST_SOFTINTS.
Add a few small optimizations.

Add IPL_VM

No need for RW_OWNER/RW_LOCK anymore

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.

fix changes which i forgot to commit with sys/arch/vax/include/mutex.h rev.1.9.

branches: 1.34.2;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

branches: 1.33.8; 1.33.10; 1.33.14;
merge yamt-idlelwp branch. asked by core@. some ports still needs work.

from doc/BRANCHES:

idle lwp, and some changes depending on it.

1. separate context switching and thread scheduling.
(cf. gmcgarry_ctxsw)
2. implement idle lwp.
3. clean up related MD/MI interfaces.
4. make scheduler(s) modular.

branches: 1.32.2; 1.32.8;
Shrink VAX kmutex from 12 bytes to 8. Fix various LOCKDEBUG/DIAGNOSTIC
problems.

branches: 1.31.2; 1.31.6;
Add an implementation for krwlock_t. Initialize ci_mtx_count to 1 (biased).
Fix a few buglets in the kmutex_t implementation.

Partially adapt the VAX port to the newlock2 changes. These are untested
but they do at least compile.

welcome to syscall_intern.

branches: 1.28.4; 1.28.6; 1.28.8; 1.28.10;
merge ktrace-lwp.

branches: 1.27.16;
Add SA_SIGINFO support for VAX.

branches: 1.26.2;
Add some instrumentation and clean up some VAX8600 code.
From Johnny Billquist.

Merge the nathanw_sa branch.

branches: 1.24.8;
Support for a machine-specific badaddr handler.

Kwality control:
* put #includes of opt headers and headers to get protos used by
net/netisr_dispatch.h in net/netisr.h (if !defined(_LOCORE)) (rather than
in netisr_dispatch.h itself, and potentially nowhere, respectively).
* require netisr.h to be included before netisr_dispatch.h.
* minor additional cleanup of both netisr.h and netisr_dispatch.h.
* clean up uses to remove now-unnecessary header file inclusions, and
local prototypes of the fns.
* convert netisr dispatch implementations which didn't use
netisr_dispatch.h (pc532) to use it.

remove include of <vm/vm.h>. <vm/vm.h> -> <uvm/uvm_extern.h>

Adjust to new evcnt stuff.

Add extra argument to scb_vecalloc (a struct evcnt *)
Move ivec_dsp from trap.h to scb.h
Add interrupt counting to asc, le, ze, ncr, dz interrupts.
add common support for counting interrupts to cnm_idisp so
it can be done very efficiently.

Add IPL_* codes.
Add other codes for struct references.
Add softintr framework for IPL_SOFTNET and IPL_SOFTSERIAL.
General cleanup of .s files replacing hardcoded structure offsets with
symbolic ones.

In the MULTIPROCESSOR case, initialize p_cpu before a process is
marked SONPROC.

Use the cpu_info struct to store cpu-specific data in the same way in
both uniprocessor and multiprocessor environments. Use the otherwise
unused internal CPU register SSP to store the cpu_info pointer.
The macros curcpu(), curproc, cpu_number() and need_resched() are now the
same in both uniprocessor and multiprocessor environments.

Remove the pcbtrap global variable, use a per-CPU variable instead.

branches: 1.15.2;
Introduce a new process state distinct from SRUN called SONPROC
which indicates that the process is actually running on a
processor. Test against SONPROC as appropriate rather than
combinations of SRUN and curproc. Update all context switch code
to properly set SONPROC when the process becomes the current
process on the CPU.

Change copy*str() functions. More paranoid checking of legal address space.
Fixes PR#7838.

Call uvm_pageidlezero() in idle loop.

Forgot a protection #define.
Make use of raise-spl.

First cut of multiprocessor support for vax. Still much to do before
other CPUs than the master can spin up.

Get symbol "NETISR_IPV6". This fixes PR#8790, but in a different way.

branches: 1.9.6; 1.9.8; 1.9.14;
Basic KA48 (VAXstation 4000 VLC) support.
From Michael Kukat <michael@camaronet.de>

Make kernel compile after recent signal changes.

Support for all 4 console lines on KA820. Support for this written
by Sergey Svishchev (svs@ropnet.ru).

Cache and microsecond clock resolution on KA46.

Enable -Wall -Wmissing-prototypes -Wstrict-prototypes.

Re-implement page reference bit emulation by using the (otherwise unused)
valid bit. This is faster than the "unmap all" solution that were described
in that Mach paper _and_ it eliminates the need for checking the wired bit.
As a result of this; swapping started working again on vax :-)

Move some interrupt routines out to assembler.
Optimize (slightly) pmap_clear_modify.

Optimized copy/fetch/store routines; rewritten in assembler.

Use genassym for the first time in vax port history. Rewrite cpu_exit,
cpu_switch, setrunqueue and remrunqueue in assembler for efficiency.