fix various typos in comments, mainly immediatly/immediately/,
as well shared and recently fixed typos in OpenBSD code by Jonathan Grey.

SH3_P2SEG_FUNC(f) - get a P2 address of a function.


Just SH3_P1SEG_TO_P2SEG + cast, but we now define SH3_P1SEG_TO_P2SEG
and SH3_P2SEG_TO_P1SEG to use arithmetic, not bitwise ops. That gives
the same result for the correct P1/P2 input values, but addition can
be done at link time with addends. Thus SH3_P2SEG_FUNC compiles to a
constant P2 address.

Fix false sharing problems with cpu_info. Identified with tprof(8).
This was a very nice win in my tests on a 48 CPU box.

- Reorganise cpu_data slightly according to usage.
- Put cpu_onproc into struct cpu_info alongside ci_curlwp (now is ci_onproc).
- On x86, put some items in their own cache lines according to usage, like
the IPI bitmask and ci_want_resched.

cpu_need_resched():

- Remove all code that should be MI, leaving the bare minimum under arch/.
- Make the required actions very explicit.
- Pass in LWP pointer for convenience.
- When a trap is required on another CPU, have the IPI set it locally.
- Expunge cpu_did_resched().

- Cleanup for dynamic sysctl:
- Remove unused *_NAMES macros for sysctl.
- Remove unused *_MAXID for sysctls.
- Move CTL_MACHDEP sysctl definitions for m68k into m68k/include/cpu.h and
use them on all m68k machines.

branches: 1.56.28; 1.56.30;
make cpu_need_resched() macros consistent; __USE flags

branches: 1.55.8; 1.55.18; 1.55.22;
PROC_PC() should have been changed to LWP_PC().

branches: 1.54.4;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

branches: 1.53.4;
Revert interrupt stack changes. There are some issues and, at least
in the current form, they complicate implementation of fast software
interrupts. I'd rather get fast softints in now and may be revisit
interrupt stack later.

Rewrite RUN_P2, RUN_P1 in asm. gcc4 is too happy to optimize away
assigned-goto versions if try to do anything fancy with them
(discovered by trying to wrap RUN_P2 into an "if").

Remove CTL_MACHDEP_NAMES, it's not used anywhere.

Ok by martin@.

branches: 1.50.2; 1.50.6;
Now that sh3 has didicated interrupt stack we can check for cpu_intr_p
with simple sp comparison, so we can drop ci_idepth.

Use dedicated interrupt stack. Tested on hpcsh and landisk. This has
been sitting in my tree for quite a while. While here s/top/bottom/
in a few places related to stacks to confirm to conventional
terminology.

branches: 1.48.2; 1.48.6;
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.

branches: 1.47.2;
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.

Make want_resched a member of cpu_info.

branches: 1.45.2; 1.45.4;
Add ci_cpuid where it's missing.

branches: 1.44.2; 1.44.4; 1.44.8;
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: 1.43.2; 1.43.6; 1.43.8; 1.43.14;
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 newlock2 to head.

branches: 1.41.18;
Declare cpu_reset as __attribute__((__noreturn__)).

Hide RUN_P2 and RUN_P1 from lint.
Drop CONSTCOND as lint doesn't see that code now.
While here, tweak them a bit to use less casts.

Use uint32_t.

branches: 1.38.2;
__asm__ -> __asm
__const__ -> const
__inline__ -> inline
__volatile__ -> volatile

merge ktrace-lwp.

branches: 1.36.12;
include sys/cpu_data.h only if defined(_KERNEL)

move some per-cpu data definitions to MI place so that they can be modified
without touching all ports. discussed on tech-kern@.

Move
(c) TNF
line from 4-clause UCB to 3-clause UCB license; in other words,
remove UCB's ad clause from the license TNF grants.
There is no point in TNF demanding that UCB's ad clause be followed
when even UCB doesn't demand it any longer.

Ok'd by board@ and agc@.

Rearrange process exit path to avoid need to free resources from different
process context ('reaper').

From within the exiting process context:
* deactivate pmap and free vmspace while we can still block
* introduce MD cpu_lwp_free() - this cleans all MD-specific context (such
as FPU state), and is the last potentially blocking operation;
all of cpu_wait(), and most of cpu_exit(), is now folded into cpu_lwp_free()
* process is now immediatelly marked as zombie and made available for pickup
by parent; the remaining last lwp continues the exit as fully detached
* MI (rather than MD) code bumps uvmexp.swtch, cpu_exit() is now same
for both 'process' and 'lwp' exit

uvm_lwp_exit() is modified to never block; the u-area memory is now
always just linked to the list of available u-areas. Introduce (blocking)
uvm_uarea_drain(), which is called to release the excessive u-area memory;
this is called by parent within wait4(), or by pagedaemon on memory shortage.
uvm_uarea_free() is now private function within uvm_glue.c.

MD process/lwp exit code now always calls lwp_exit2() immediatelly after
switching away from the exiting lwp.

g/c now unneeded routines and variables, including the reaper kernel thread

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.31.2;
Merge the nathanw_sa branch.

add some definitions for P[VR]R register

branches: 1.29.6;
Make CLKF_INTR() slightly less broken. The previous definition always
tested true if the CPU was running in the kernel at the time of the clock
interrupt, therefore all such time (kernel and idle) was counted as interrupt
time. The new definition simply punts on trying to count interrupt time,
which allows us to see kernel and idle time.

Use "#define<tab>", white space nits.

add SH4 Processor Version Register

Rework interrupt code.
+ Fully utilize SH SR.I[0:3] interrupt level.
+ software interrupt is emulated by TMU1, 2 one shot interrupt.
+ implement generic soft interrupts.
+ implement clockframe correctly.

cosmetic changes, fix comments.

change to per-process AST.

cpu_swapout() moved to cpu.h

CTL_MACHDEP definitions are integrated into sh3/include/cpu.h again.

machine dependent sysctl are moved to machine/cpu.h
dreamcast, hpcsh ... CPU_CONSDEV
mmeye, evbsh3 ... CPU_CONSDEV, CPU_LOADANDRESET

cpu_dumpconf, reserve_dumppages, dumpsys, cpu_reset are moved to sh3/sh3_machdep.c

Move common exception vector and scheduler code to
sh3/sh3/exception_vector.S and sh3/sh3/locore_subr.S. exception
vectors are installed by sh_cpu_init(). machine/locore.S contains
kernel entry, interrupt handler, and some MD code.

New NetBSD/sh3 clock framework.
+ hardclock source is moved from TMU1 to TMU0.
+ SH3/SH4 common kernel support.
+ PCLOCK estimation.
+ remove duplicated code.

Clean up function declaration.

Add new MMU API. for detail, see sh3/mmu.h's comment.

ANSIfy KNF.

add useful macro for running P2, P1 area.

branches: 1.13.2;
fix KERNELMODE() macro (check MD bits, too)

use _KERNEL_OPT

branches: 1.11.2;
Add some comments about P/USEG

Make need_resched() take a "struct cpu_info *" argument. This
causes gives a primitive form of processor affinity. Its use in
roundrobin() still needs some work.

branches: 1.9.2;
Remove child_return prototype; it is now in sys/proc.h.

branches: 1.8.2;
First sweep at scheduler state cleanup. Collect MI scheduler
state into global and per-CPU scheduler state:

- Global state: sched_qs (run queues), sched_whichqs (bitmap
of non-empty run queues), sched_slpque (sleep queues).
NOTE: These may collectively move into a struct schedstate
at some point in the future.

- Per-CPU state, struct schedstate_percpu: spc_runtime
(time process on this CPU started running), spc_flags
(replaces struct proc's p_schedflags), and
spc_curpriority (usrpri of processes on this CPU).

- Every platform must now supply a struct cpu_info and
a curcpu() macro. Simplify existing cpu_info declarations
where appropriate.

- All references to per-CPU scheduler state now made through
curcpu(). NOTE: this will likely be adjusted in the future
after further changes to struct proc are made.

Tested on i386 and Alpha. Changes are mostly mechanical, but apologies
in advance if it doesn't compile on a particular platform.

SH4!

add SH3_{PHYS,P1SEG,P2SEG}_TO_{PHYS,P1SEG,P2SEG} macros

back to previous one (suggested by cgd)

move sysctl definitions into ${MACHINE}/include/cpu.h

G.C.

branches: 1.2.2; 1.2.8;
Catch up with -current.

Merge in NetBSD/sh3 from cvs.kame.net repository.

Tree structure:
- sys/arch/sh3: sh3 generic code
As commented, in-chip device drivers are put into sys/arch/sh3/dev.
- sys/arch/evbsh3: sh3 evaluation boards (pure sh3 CPU, no fancy external HW)
- sys/arch/mmeye: Brains mmEye, www.brains.co.jp
MI source code includes couple of #ifdef for sh3-coff support.
(sh3 uses coff or elf)

Needs some more improvements, especialy in sys/arch/sh3/conf/files.sh3,
to compile the tree (due to last minute tree structure change).

SH3_P2SEG_FUNC(f) - get a P2 address of a function.


Just SH3_P1SEG_TO_P2SEG + cast, but we now define SH3_P1SEG_TO_P2SEG
and SH3_P2SEG_TO_P1SEG to use arithmetic, not bitwise ops. That gives
the same result for the correct P1/P2 input values, but addition can
be done at link time with addends. Thus SH3_P2SEG_FUNC compiles to a
constant P2 address.

Fix false sharing problems with cpu_info. Identified with tprof(8).
This was a very nice win in my tests on a 48 CPU box.

- Reorganise cpu_data slightly according to usage.
- Put cpu_onproc into struct cpu_info alongside ci_curlwp (now is ci_onproc).
- On x86, put some items in their own cache lines according to usage, like
the IPI bitmask and ci_want_resched.

cpu_need_resched():

- Remove all code that should be MI, leaving the bare minimum under arch/.
- Make the required actions very explicit.
- Pass in LWP pointer for convenience.
- When a trap is required on another CPU, have the IPI set it locally.
- Expunge cpu_did_resched().

- Cleanup for dynamic sysctl:
- Remove unused *_NAMES macros for sysctl.
- Remove unused *_MAXID for sysctls.
- Move CTL_MACHDEP sysctl definitions for m68k into m68k/include/cpu.h and
use them on all m68k machines.

branches: 1.56.28; 1.56.30;
make cpu_need_resched() macros consistent; __USE flags

branches: 1.55.8; 1.55.18; 1.55.22;
PROC_PC() should have been changed to LWP_PC().

branches: 1.54.4;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

branches: 1.53.4;
Revert interrupt stack changes. There are some issues and, at least
in the current form, they complicate implementation of fast software
interrupts. I'd rather get fast softints in now and may be revisit
interrupt stack later.

Rewrite RUN_P2, RUN_P1 in asm. gcc4 is too happy to optimize away
assigned-goto versions if try to do anything fancy with them
(discovered by trying to wrap RUN_P2 into an "if").

Remove CTL_MACHDEP_NAMES, it's not used anywhere.

Ok by martin@.

branches: 1.50.2; 1.50.6;
Now that sh3 has didicated interrupt stack we can check for cpu_intr_p
with simple sp comparison, so we can drop ci_idepth.

Use dedicated interrupt stack. Tested on hpcsh and landisk. This has
been sitting in my tree for quite a while. While here s/top/bottom/
in a few places related to stacks to confirm to conventional
terminology.

branches: 1.48.2; 1.48.6;
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.

branches: 1.47.2;
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.

Make want_resched a member of cpu_info.

branches: 1.45.2; 1.45.4;
Add ci_cpuid where it's missing.

branches: 1.44.2; 1.44.4; 1.44.8;
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: 1.43.2; 1.43.6; 1.43.8; 1.43.14;
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 newlock2 to head.

branches: 1.41.18;
Declare cpu_reset as __attribute__((__noreturn__)).

Hide RUN_P2 and RUN_P1 from lint.
Drop CONSTCOND as lint doesn't see that code now.
While here, tweak them a bit to use less casts.

Use uint32_t.

branches: 1.38.2;
__asm__ -> __asm
__const__ -> const
__inline__ -> inline
__volatile__ -> volatile

merge ktrace-lwp.

branches: 1.36.12;
include sys/cpu_data.h only if defined(_KERNEL)

move some per-cpu data definitions to MI place so that they can be modified
without touching all ports. discussed on tech-kern@.

Move
(c) TNF
line from 4-clause UCB to 3-clause UCB license; in other words,
remove UCB's ad clause from the license TNF grants.
There is no point in TNF demanding that UCB's ad clause be followed
when even UCB doesn't demand it any longer.

Ok'd by board@ and agc@.

Rearrange process exit path to avoid need to free resources from different
process context ('reaper').

From within the exiting process context:
* deactivate pmap and free vmspace while we can still block
* introduce MD cpu_lwp_free() - this cleans all MD-specific context (such
as FPU state), and is the last potentially blocking operation;
all of cpu_wait(), and most of cpu_exit(), is now folded into cpu_lwp_free()
* process is now immediatelly marked as zombie and made available for pickup
by parent; the remaining last lwp continues the exit as fully detached
* MI (rather than MD) code bumps uvmexp.swtch, cpu_exit() is now same
for both 'process' and 'lwp' exit

uvm_lwp_exit() is modified to never block; the u-area memory is now
always just linked to the list of available u-areas. Introduce (blocking)
uvm_uarea_drain(), which is called to release the excessive u-area memory;
this is called by parent within wait4(), or by pagedaemon on memory shortage.
uvm_uarea_free() is now private function within uvm_glue.c.

MD process/lwp exit code now always calls lwp_exit2() immediatelly after
switching away from the exiting lwp.

g/c now unneeded routines and variables, including the reaper kernel thread

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.31.2;
Merge the nathanw_sa branch.

add some definitions for P[VR]R register

branches: 1.29.6;
Make CLKF_INTR() slightly less broken. The previous definition always
tested true if the CPU was running in the kernel at the time of the clock
interrupt, therefore all such time (kernel and idle) was counted as interrupt
time. The new definition simply punts on trying to count interrupt time,
which allows us to see kernel and idle time.

Use "#define<tab>", white space nits.

add SH4 Processor Version Register

Rework interrupt code.
+ Fully utilize SH SR.I[0:3] interrupt level.
+ software interrupt is emulated by TMU1, 2 one shot interrupt.
+ implement generic soft interrupts.
+ implement clockframe correctly.

cosmetic changes, fix comments.

change to per-process AST.

cpu_swapout() moved to cpu.h

CTL_MACHDEP definitions are integrated into sh3/include/cpu.h again.

machine dependent sysctl are moved to machine/cpu.h
dreamcast, hpcsh ... CPU_CONSDEV
mmeye, evbsh3 ... CPU_CONSDEV, CPU_LOADANDRESET

cpu_dumpconf, reserve_dumppages, dumpsys, cpu_reset are moved to sh3/sh3_machdep.c

Move common exception vector and scheduler code to
sh3/sh3/exception_vector.S and sh3/sh3/locore_subr.S. exception
vectors are installed by sh_cpu_init(). machine/locore.S contains
kernel entry, interrupt handler, and some MD code.

New NetBSD/sh3 clock framework.
+ hardclock source is moved from TMU1 to TMU0.
+ SH3/SH4 common kernel support.
+ PCLOCK estimation.
+ remove duplicated code.

Clean up function declaration.

Add new MMU API. for detail, see sh3/mmu.h's comment.

ANSIfy KNF.

add useful macro for running P2, P1 area.

branches: 1.13.2;
fix KERNELMODE() macro (check MD bits, too)

use _KERNEL_OPT

branches: 1.11.2;
Add some comments about P/USEG

Make need_resched() take a "struct cpu_info *" argument. This
causes gives a primitive form of processor affinity. Its use in
roundrobin() still needs some work.

branches: 1.9.2;
Remove child_return prototype; it is now in sys/proc.h.

branches: 1.8.2;
First sweep at scheduler state cleanup. Collect MI scheduler
state into global and per-CPU scheduler state:

- Global state: sched_qs (run queues), sched_whichqs (bitmap
of non-empty run queues), sched_slpque (sleep queues).
NOTE: These may collectively move into a struct schedstate
at some point in the future.

- Per-CPU state, struct schedstate_percpu: spc_runtime
(time process on this CPU started running), spc_flags
(replaces struct proc's p_schedflags), and
spc_curpriority (usrpri of processes on this CPU).

- Every platform must now supply a struct cpu_info and
a curcpu() macro. Simplify existing cpu_info declarations
where appropriate.

- All references to per-CPU scheduler state now made through
curcpu(). NOTE: this will likely be adjusted in the future
after further changes to struct proc are made.

Tested on i386 and Alpha. Changes are mostly mechanical, but apologies
in advance if it doesn't compile on a particular platform.

SH4!

add SH3_{PHYS,P1SEG,P2SEG}_TO_{PHYS,P1SEG,P2SEG} macros

back to previous one (suggested by cgd)

move sysctl definitions into ${MACHINE}/include/cpu.h

G.C.

branches: 1.2.2; 1.2.8;
Catch up with -current.

Merge in NetBSD/sh3 from cvs.kame.net repository.

Tree structure:
- sys/arch/sh3: sh3 generic code
As commented, in-chip device drivers are put into sys/arch/sh3/dev.
- sys/arch/evbsh3: sh3 evaluation boards (pure sh3 CPU, no fancy external HW)
- sys/arch/mmeye: Brains mmEye, www.brains.co.jp
MI source code includes couple of #ifdef for sh3-coff support.
(sh3 uses coff or elf)

Needs some more improvements, especialy in sys/arch/sh3/conf/files.sh3,
to compile the tree (due to last minute tree structure change).

Fix false sharing problems with cpu_info. Identified with tprof(8).
This was a very nice win in my tests on a 48 CPU box.

- Reorganise cpu_data slightly according to usage.
- Put cpu_onproc into struct cpu_info alongside ci_curlwp (now is ci_onproc).
- On x86, put some items in their own cache lines according to usage, like
the IPI bitmask and ci_want_resched.

cpu_need_resched():

- Remove all code that should be MI, leaving the bare minimum under arch/.
- Make the required actions very explicit.
- Pass in LWP pointer for convenience.
- When a trap is required on another CPU, have the IPI set it locally.
- Expunge cpu_did_resched().

- Cleanup for dynamic sysctl:
- Remove unused *_NAMES macros for sysctl.
- Remove unused *_MAXID for sysctls.
- Move CTL_MACHDEP sysctl definitions for m68k into m68k/include/cpu.h and
use them on all m68k machines.

branches: 1.56.28; 1.56.30;
make cpu_need_resched() macros consistent; __USE flags

branches: 1.55.8; 1.55.18; 1.55.22;
PROC_PC() should have been changed to LWP_PC().

branches: 1.54.4;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

branches: 1.53.4;
Revert interrupt stack changes. There are some issues and, at least
in the current form, they complicate implementation of fast software
interrupts. I'd rather get fast softints in now and may be revisit
interrupt stack later.

Rewrite RUN_P2, RUN_P1 in asm. gcc4 is too happy to optimize away
assigned-goto versions if try to do anything fancy with them
(discovered by trying to wrap RUN_P2 into an "if").

Remove CTL_MACHDEP_NAMES, it's not used anywhere.

Ok by martin@.

branches: 1.50.2; 1.50.6;
Now that sh3 has didicated interrupt stack we can check for cpu_intr_p
with simple sp comparison, so we can drop ci_idepth.

Use dedicated interrupt stack. Tested on hpcsh and landisk. This has
been sitting in my tree for quite a while. While here s/top/bottom/
in a few places related to stacks to confirm to conventional
terminology.

branches: 1.48.2; 1.48.6;
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.

branches: 1.47.2;
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.

Make want_resched a member of cpu_info.

branches: 1.45.2; 1.45.4;
Add ci_cpuid where it's missing.

branches: 1.44.2; 1.44.4; 1.44.8;
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: 1.43.2; 1.43.6; 1.43.8; 1.43.14;
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 newlock2 to head.

branches: 1.41.18;
Declare cpu_reset as __attribute__((__noreturn__)).

Hide RUN_P2 and RUN_P1 from lint.
Drop CONSTCOND as lint doesn't see that code now.
While here, tweak them a bit to use less casts.

Use uint32_t.

branches: 1.38.2;
__asm__ -> __asm
__const__ -> const
__inline__ -> inline
__volatile__ -> volatile

merge ktrace-lwp.

branches: 1.36.12;
include sys/cpu_data.h only if defined(_KERNEL)

move some per-cpu data definitions to MI place so that they can be modified
without touching all ports. discussed on tech-kern@.

Move
(c) TNF
line from 4-clause UCB to 3-clause UCB license; in other words,
remove UCB's ad clause from the license TNF grants.
There is no point in TNF demanding that UCB's ad clause be followed
when even UCB doesn't demand it any longer.

Ok'd by board@ and agc@.

Rearrange process exit path to avoid need to free resources from different
process context ('reaper').

From within the exiting process context:
* deactivate pmap and free vmspace while we can still block
* introduce MD cpu_lwp_free() - this cleans all MD-specific context (such
as FPU state), and is the last potentially blocking operation;
all of cpu_wait(), and most of cpu_exit(), is now folded into cpu_lwp_free()
* process is now immediatelly marked as zombie and made available for pickup
by parent; the remaining last lwp continues the exit as fully detached
* MI (rather than MD) code bumps uvmexp.swtch, cpu_exit() is now same
for both 'process' and 'lwp' exit

uvm_lwp_exit() is modified to never block; the u-area memory is now
always just linked to the list of available u-areas. Introduce (blocking)
uvm_uarea_drain(), which is called to release the excessive u-area memory;
this is called by parent within wait4(), or by pagedaemon on memory shortage.
uvm_uarea_free() is now private function within uvm_glue.c.

MD process/lwp exit code now always calls lwp_exit2() immediatelly after
switching away from the exiting lwp.

g/c now unneeded routines and variables, including the reaper kernel thread

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.31.2;
Merge the nathanw_sa branch.

add some definitions for P[VR]R register

branches: 1.29.6;
Make CLKF_INTR() slightly less broken. The previous definition always
tested true if the CPU was running in the kernel at the time of the clock
interrupt, therefore all such time (kernel and idle) was counted as interrupt
time. The new definition simply punts on trying to count interrupt time,
which allows us to see kernel and idle time.

Use "#define<tab>", white space nits.

add SH4 Processor Version Register

Rework interrupt code.
+ Fully utilize SH SR.I[0:3] interrupt level.
+ software interrupt is emulated by TMU1, 2 one shot interrupt.
+ implement generic soft interrupts.
+ implement clockframe correctly.

cosmetic changes, fix comments.

change to per-process AST.

cpu_swapout() moved to cpu.h

CTL_MACHDEP definitions are integrated into sh3/include/cpu.h again.

machine dependent sysctl are moved to machine/cpu.h
dreamcast, hpcsh ... CPU_CONSDEV
mmeye, evbsh3 ... CPU_CONSDEV, CPU_LOADANDRESET

cpu_dumpconf, reserve_dumppages, dumpsys, cpu_reset are moved to sh3/sh3_machdep.c

Move common exception vector and scheduler code to
sh3/sh3/exception_vector.S and sh3/sh3/locore_subr.S. exception
vectors are installed by sh_cpu_init(). machine/locore.S contains
kernel entry, interrupt handler, and some MD code.

New NetBSD/sh3 clock framework.
+ hardclock source is moved from TMU1 to TMU0.
+ SH3/SH4 common kernel support.
+ PCLOCK estimation.
+ remove duplicated code.

Clean up function declaration.

Add new MMU API. for detail, see sh3/mmu.h's comment.

ANSIfy KNF.

add useful macro for running P2, P1 area.

branches: 1.13.2;
fix KERNELMODE() macro (check MD bits, too)

use _KERNEL_OPT

branches: 1.11.2;
Add some comments about P/USEG

Make need_resched() take a "struct cpu_info *" argument. This
causes gives a primitive form of processor affinity. Its use in
roundrobin() still needs some work.

branches: 1.9.2;
Remove child_return prototype; it is now in sys/proc.h.

branches: 1.8.2;
First sweep at scheduler state cleanup. Collect MI scheduler
state into global and per-CPU scheduler state:

- Global state: sched_qs (run queues), sched_whichqs (bitmap
of non-empty run queues), sched_slpque (sleep queues).
NOTE: These may collectively move into a struct schedstate
at some point in the future.

- Per-CPU state, struct schedstate_percpu: spc_runtime
(time process on this CPU started running), spc_flags
(replaces struct proc's p_schedflags), and
spc_curpriority (usrpri of processes on this CPU).

- Every platform must now supply a struct cpu_info and
a curcpu() macro. Simplify existing cpu_info declarations
where appropriate.

- All references to per-CPU scheduler state now made through
curcpu(). NOTE: this will likely be adjusted in the future
after further changes to struct proc are made.

Tested on i386 and Alpha. Changes are mostly mechanical, but apologies
in advance if it doesn't compile on a particular platform.

SH4!

add SH3_{PHYS,P1SEG,P2SEG}_TO_{PHYS,P1SEG,P2SEG} macros

back to previous one (suggested by cgd)

move sysctl definitions into ${MACHINE}/include/cpu.h

G.C.

branches: 1.2.2; 1.2.8;
Catch up with -current.

Merge in NetBSD/sh3 from cvs.kame.net repository.

Tree structure:
- sys/arch/sh3: sh3 generic code
As commented, in-chip device drivers are put into sys/arch/sh3/dev.
- sys/arch/evbsh3: sh3 evaluation boards (pure sh3 CPU, no fancy external HW)
- sys/arch/mmeye: Brains mmEye, www.brains.co.jp
MI source code includes couple of #ifdef for sh3-coff support.
(sh3 uses coff or elf)

Needs some more improvements, especialy in sys/arch/sh3/conf/files.sh3,
to compile the tree (due to last minute tree structure change).

cpu_need_resched():

- Remove all code that should be MI, leaving the bare minimum under arch/.
- Make the required actions very explicit.
- Pass in LWP pointer for convenience.
- When a trap is required on another CPU, have the IPI set it locally.
- Expunge cpu_did_resched().

- Cleanup for dynamic sysctl:
- Remove unused *_NAMES macros for sysctl.
- Remove unused *_MAXID for sysctls.
- Move CTL_MACHDEP sysctl definitions for m68k into m68k/include/cpu.h and
use them on all m68k machines.

branches: 1.56.28; 1.56.30;
make cpu_need_resched() macros consistent; __USE flags

branches: 1.55.8; 1.55.18; 1.55.22;
PROC_PC() should have been changed to LWP_PC().

branches: 1.54.4;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

branches: 1.53.4;
Revert interrupt stack changes. There are some issues and, at least
in the current form, they complicate implementation of fast software
interrupts. I'd rather get fast softints in now and may be revisit
interrupt stack later.

Rewrite RUN_P2, RUN_P1 in asm. gcc4 is too happy to optimize away
assigned-goto versions if try to do anything fancy with them
(discovered by trying to wrap RUN_P2 into an "if").

Remove CTL_MACHDEP_NAMES, it's not used anywhere.

Ok by martin@.

branches: 1.50.2; 1.50.6;
Now that sh3 has didicated interrupt stack we can check for cpu_intr_p
with simple sp comparison, so we can drop ci_idepth.

Use dedicated interrupt stack. Tested on hpcsh and landisk. This has
been sitting in my tree for quite a while. While here s/top/bottom/
in a few places related to stacks to confirm to conventional
terminology.

branches: 1.48.2; 1.48.6;
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.

branches: 1.47.2;
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.

Make want_resched a member of cpu_info.

branches: 1.45.2; 1.45.4;
Add ci_cpuid where it's missing.

branches: 1.44.2; 1.44.4; 1.44.8;
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: 1.43.2; 1.43.6; 1.43.8; 1.43.14;
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 newlock2 to head.

branches: 1.41.18;
Declare cpu_reset as __attribute__((__noreturn__)).

Hide RUN_P2 and RUN_P1 from lint.
Drop CONSTCOND as lint doesn't see that code now.
While here, tweak them a bit to use less casts.

Use uint32_t.

branches: 1.38.2;
__asm__ -> __asm
__const__ -> const
__inline__ -> inline
__volatile__ -> volatile

merge ktrace-lwp.

branches: 1.36.12;
include sys/cpu_data.h only if defined(_KERNEL)

move some per-cpu data definitions to MI place so that they can be modified
without touching all ports. discussed on tech-kern@.

Move
(c) TNF
line from 4-clause UCB to 3-clause UCB license; in other words,
remove UCB's ad clause from the license TNF grants.
There is no point in TNF demanding that UCB's ad clause be followed
when even UCB doesn't demand it any longer.

Ok'd by board@ and agc@.

Rearrange process exit path to avoid need to free resources from different
process context ('reaper').

From within the exiting process context:
* deactivate pmap and free vmspace while we can still block
* introduce MD cpu_lwp_free() - this cleans all MD-specific context (such
as FPU state), and is the last potentially blocking operation;
all of cpu_wait(), and most of cpu_exit(), is now folded into cpu_lwp_free()
* process is now immediatelly marked as zombie and made available for pickup
by parent; the remaining last lwp continues the exit as fully detached
* MI (rather than MD) code bumps uvmexp.swtch, cpu_exit() is now same
for both 'process' and 'lwp' exit

uvm_lwp_exit() is modified to never block; the u-area memory is now
always just linked to the list of available u-areas. Introduce (blocking)
uvm_uarea_drain(), which is called to release the excessive u-area memory;
this is called by parent within wait4(), or by pagedaemon on memory shortage.
uvm_uarea_free() is now private function within uvm_glue.c.

MD process/lwp exit code now always calls lwp_exit2() immediatelly after
switching away from the exiting lwp.

g/c now unneeded routines and variables, including the reaper kernel thread

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.31.2;
Merge the nathanw_sa branch.

add some definitions for P[VR]R register

branches: 1.29.6;
Make CLKF_INTR() slightly less broken. The previous definition always
tested true if the CPU was running in the kernel at the time of the clock
interrupt, therefore all such time (kernel and idle) was counted as interrupt
time. The new definition simply punts on trying to count interrupt time,
which allows us to see kernel and idle time.

Use "#define<tab>", white space nits.

add SH4 Processor Version Register

Rework interrupt code.
+ Fully utilize SH SR.I[0:3] interrupt level.
+ software interrupt is emulated by TMU1, 2 one shot interrupt.
+ implement generic soft interrupts.
+ implement clockframe correctly.

cosmetic changes, fix comments.

change to per-process AST.

cpu_swapout() moved to cpu.h

CTL_MACHDEP definitions are integrated into sh3/include/cpu.h again.

machine dependent sysctl are moved to machine/cpu.h
dreamcast, hpcsh ... CPU_CONSDEV
mmeye, evbsh3 ... CPU_CONSDEV, CPU_LOADANDRESET

cpu_dumpconf, reserve_dumppages, dumpsys, cpu_reset are moved to sh3/sh3_machdep.c

Move common exception vector and scheduler code to
sh3/sh3/exception_vector.S and sh3/sh3/locore_subr.S. exception
vectors are installed by sh_cpu_init(). machine/locore.S contains
kernel entry, interrupt handler, and some MD code.

New NetBSD/sh3 clock framework.
+ hardclock source is moved from TMU1 to TMU0.
+ SH3/SH4 common kernel support.
+ PCLOCK estimation.
+ remove duplicated code.

Clean up function declaration.

Add new MMU API. for detail, see sh3/mmu.h's comment.

ANSIfy KNF.

add useful macro for running P2, P1 area.

branches: 1.13.2;
fix KERNELMODE() macro (check MD bits, too)

use _KERNEL_OPT

branches: 1.11.2;
Add some comments about P/USEG

Make need_resched() take a "struct cpu_info *" argument. This
causes gives a primitive form of processor affinity. Its use in
roundrobin() still needs some work.

branches: 1.9.2;
Remove child_return prototype; it is now in sys/proc.h.

branches: 1.8.2;
First sweep at scheduler state cleanup. Collect MI scheduler
state into global and per-CPU scheduler state:

- Global state: sched_qs (run queues), sched_whichqs (bitmap
of non-empty run queues), sched_slpque (sleep queues).
NOTE: These may collectively move into a struct schedstate
at some point in the future.

- Per-CPU state, struct schedstate_percpu: spc_runtime
(time process on this CPU started running), spc_flags
(replaces struct proc's p_schedflags), and
spc_curpriority (usrpri of processes on this CPU).

- Every platform must now supply a struct cpu_info and
a curcpu() macro. Simplify existing cpu_info declarations
where appropriate.

- All references to per-CPU scheduler state now made through
curcpu(). NOTE: this will likely be adjusted in the future
after further changes to struct proc are made.

Tested on i386 and Alpha. Changes are mostly mechanical, but apologies
in advance if it doesn't compile on a particular platform.

SH4!

add SH3_{PHYS,P1SEG,P2SEG}_TO_{PHYS,P1SEG,P2SEG} macros

back to previous one (suggested by cgd)

move sysctl definitions into ${MACHINE}/include/cpu.h

G.C.

branches: 1.2.2; 1.2.8;
Catch up with -current.

Merge in NetBSD/sh3 from cvs.kame.net repository.

Tree structure:
- sys/arch/sh3: sh3 generic code
As commented, in-chip device drivers are put into sys/arch/sh3/dev.
- sys/arch/evbsh3: sh3 evaluation boards (pure sh3 CPU, no fancy external HW)
- sys/arch/mmeye: Brains mmEye, www.brains.co.jp
MI source code includes couple of #ifdef for sh3-coff support.
(sh3 uses coff or elf)

Needs some more improvements, especialy in sys/arch/sh3/conf/files.sh3,
to compile the tree (due to last minute tree structure change).

- Cleanup for dynamic sysctl:
- Remove unused *_NAMES macros for sysctl.
- Remove unused *_MAXID for sysctls.
- Move CTL_MACHDEP sysctl definitions for m68k into m68k/include/cpu.h and
use them on all m68k machines.

branches: 1.56.28;
make cpu_need_resched() macros consistent; __USE flags

branches: 1.55.8; 1.55.18; 1.55.22;
PROC_PC() should have been changed to LWP_PC().

branches: 1.54.4;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

branches: 1.53.4;
Revert interrupt stack changes. There are some issues and, at least
in the current form, they complicate implementation of fast software
interrupts. I'd rather get fast softints in now and may be revisit
interrupt stack later.

Rewrite RUN_P2, RUN_P1 in asm. gcc4 is too happy to optimize away
assigned-goto versions if try to do anything fancy with them
(discovered by trying to wrap RUN_P2 into an "if").

Remove CTL_MACHDEP_NAMES, it's not used anywhere.

Ok by martin@.

branches: 1.50.2; 1.50.6;
Now that sh3 has didicated interrupt stack we can check for cpu_intr_p
with simple sp comparison, so we can drop ci_idepth.

Use dedicated interrupt stack. Tested on hpcsh and landisk. This has
been sitting in my tree for quite a while. While here s/top/bottom/
in a few places related to stacks to confirm to conventional
terminology.

branches: 1.48.2; 1.48.6;
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.

branches: 1.47.2;
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.

Make want_resched a member of cpu_info.

branches: 1.45.2; 1.45.4;
Add ci_cpuid where it's missing.

branches: 1.44.2; 1.44.4; 1.44.8;
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: 1.43.2; 1.43.6; 1.43.8; 1.43.14;
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 newlock2 to head.

branches: 1.41.18;
Declare cpu_reset as __attribute__((__noreturn__)).

Hide RUN_P2 and RUN_P1 from lint.
Drop CONSTCOND as lint doesn't see that code now.
While here, tweak them a bit to use less casts.

Use uint32_t.

branches: 1.38.2;
__asm__ -> __asm
__const__ -> const
__inline__ -> inline
__volatile__ -> volatile

merge ktrace-lwp.

branches: 1.36.12;
include sys/cpu_data.h only if defined(_KERNEL)

move some per-cpu data definitions to MI place so that they can be modified
without touching all ports. discussed on tech-kern@.

Move
(c) TNF
line from 4-clause UCB to 3-clause UCB license; in other words,
remove UCB's ad clause from the license TNF grants.
There is no point in TNF demanding that UCB's ad clause be followed
when even UCB doesn't demand it any longer.

Ok'd by board@ and agc@.

Rearrange process exit path to avoid need to free resources from different
process context ('reaper').

From within the exiting process context:
* deactivate pmap and free vmspace while we can still block
* introduce MD cpu_lwp_free() - this cleans all MD-specific context (such
as FPU state), and is the last potentially blocking operation;
all of cpu_wait(), and most of cpu_exit(), is now folded into cpu_lwp_free()
* process is now immediatelly marked as zombie and made available for pickup
by parent; the remaining last lwp continues the exit as fully detached
* MI (rather than MD) code bumps uvmexp.swtch, cpu_exit() is now same
for both 'process' and 'lwp' exit

uvm_lwp_exit() is modified to never block; the u-area memory is now
always just linked to the list of available u-areas. Introduce (blocking)
uvm_uarea_drain(), which is called to release the excessive u-area memory;
this is called by parent within wait4(), or by pagedaemon on memory shortage.
uvm_uarea_free() is now private function within uvm_glue.c.

MD process/lwp exit code now always calls lwp_exit2() immediatelly after
switching away from the exiting lwp.

g/c now unneeded routines and variables, including the reaper kernel thread

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.31.2;
Merge the nathanw_sa branch.

add some definitions for P[VR]R register

branches: 1.29.6;
Make CLKF_INTR() slightly less broken. The previous definition always
tested true if the CPU was running in the kernel at the time of the clock
interrupt, therefore all such time (kernel and idle) was counted as interrupt
time. The new definition simply punts on trying to count interrupt time,
which allows us to see kernel and idle time.

Use "#define<tab>", white space nits.

add SH4 Processor Version Register

Rework interrupt code.
+ Fully utilize SH SR.I[0:3] interrupt level.
+ software interrupt is emulated by TMU1, 2 one shot interrupt.
+ implement generic soft interrupts.
+ implement clockframe correctly.

cosmetic changes, fix comments.

change to per-process AST.

cpu_swapout() moved to cpu.h

CTL_MACHDEP definitions are integrated into sh3/include/cpu.h again.

machine dependent sysctl are moved to machine/cpu.h
dreamcast, hpcsh ... CPU_CONSDEV
mmeye, evbsh3 ... CPU_CONSDEV, CPU_LOADANDRESET

cpu_dumpconf, reserve_dumppages, dumpsys, cpu_reset are moved to sh3/sh3_machdep.c

Move common exception vector and scheduler code to
sh3/sh3/exception_vector.S and sh3/sh3/locore_subr.S. exception
vectors are installed by sh_cpu_init(). machine/locore.S contains
kernel entry, interrupt handler, and some MD code.

New NetBSD/sh3 clock framework.
+ hardclock source is moved from TMU1 to TMU0.
+ SH3/SH4 common kernel support.
+ PCLOCK estimation.
+ remove duplicated code.

Clean up function declaration.

Add new MMU API. for detail, see sh3/mmu.h's comment.

ANSIfy KNF.

add useful macro for running P2, P1 area.

branches: 1.13.2;
fix KERNELMODE() macro (check MD bits, too)

use _KERNEL_OPT

branches: 1.11.2;
Add some comments about P/USEG

Make need_resched() take a "struct cpu_info *" argument. This
causes gives a primitive form of processor affinity. Its use in
roundrobin() still needs some work.

branches: 1.9.2;
Remove child_return prototype; it is now in sys/proc.h.

branches: 1.8.2;
First sweep at scheduler state cleanup. Collect MI scheduler
state into global and per-CPU scheduler state:

- Global state: sched_qs (run queues), sched_whichqs (bitmap
of non-empty run queues), sched_slpque (sleep queues).
NOTE: These may collectively move into a struct schedstate
at some point in the future.

- Per-CPU state, struct schedstate_percpu: spc_runtime
(time process on this CPU started running), spc_flags
(replaces struct proc's p_schedflags), and
spc_curpriority (usrpri of processes on this CPU).

- Every platform must now supply a struct cpu_info and
a curcpu() macro. Simplify existing cpu_info declarations
where appropriate.

- All references to per-CPU scheduler state now made through
curcpu(). NOTE: this will likely be adjusted in the future
after further changes to struct proc are made.

Tested on i386 and Alpha. Changes are mostly mechanical, but apologies
in advance if it doesn't compile on a particular platform.

SH4!

add SH3_{PHYS,P1SEG,P2SEG}_TO_{PHYS,P1SEG,P2SEG} macros

back to previous one (suggested by cgd)

move sysctl definitions into ${MACHINE}/include/cpu.h

G.C.

branches: 1.2.2; 1.2.8;
Catch up with -current.

Merge in NetBSD/sh3 from cvs.kame.net repository.

Tree structure:
- sys/arch/sh3: sh3 generic code
As commented, in-chip device drivers are put into sys/arch/sh3/dev.
- sys/arch/evbsh3: sh3 evaluation boards (pure sh3 CPU, no fancy external HW)
- sys/arch/mmeye: Brains mmEye, www.brains.co.jp
MI source code includes couple of #ifdef for sh3-coff support.
(sh3 uses coff or elf)

Needs some more improvements, especialy in sys/arch/sh3/conf/files.sh3,
to compile the tree (due to last minute tree structure change).