Largely unify the <machine/cpu.h> headers on the m68k platforms.

Switch the x68k port to use the same clockframe layout as the other
m68k ports.

Make the M68K_MMU_* defines real kernel options, available in opt_m68k_arch.h.
For 68030, 68040, and 68060, infer M68K_MMU_MOTOROLA. For 68010 and 68020, it
must be an explicit option (set in std.${MACHINE} or, in the case of hp300,
inferred from the specific model option).

Remove duplicated / slightly-tweaked loadustp() (load user segment table)
routines from all of the m68k ports using the shared pmap. Instead, in
pmap_init(), set up a function pointer to the appropriate mmu_load_urp*()
function in mmu_subr.s.

TAB/space/indent cleanup.

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().

Refactor the 68040 writeback() from each m68k port's trap handler into a
shared copy: m68040_writeback(). It is essentially a copy of the Atari
version, with some minor cosmetic tweaks and one small performance optimization
from the mvme68k port.

Tested by rjs@ on a Quadra 950. (Thanks!)

- 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: 1.59.14; 1.59.16;
Fix typo "one the" and architecture where appropriate.

branches: 1.58.4; 1.58.8;
Remove the variable not used anymore.
sync with x68k/pmap_bootstrap.c,v 1.21 (in 2001).

branches: 1.57.2;
make cpu_need_resched() macros consistent; __USE flags

branches: 1.56.6; 1.56.10;
Always include <m68k/cpu.h> (i.e. outside #if defined(_KERNEL))
for crash(8) as amiga and sun3. There are _KERNEL protections in it.

Briefly tested by "build.sh -m news68k -U build".
Further possible botch will be fixed later.

branches: 1.55.4;
Merge copy-and-pasted fpu_probe() function (to share it among more m68k ports).
Tested on TT030, Sun3/80, and X68030.

branches: 1.54.4;
- merge and move pasted m68k MD setreg() functions into m68k/m68k_machdep.c
- move m68881_save() and m68881_restore() declarations into <m68k/m68k.h>

Briefly tested and no obvious breakage on atari, sun3, and x68k.

Make intiobase and intiolimit unsigned for consistency.

Remove clause 3 (UCB advertising clause) from the University of Utah
copyright. Confirmed by Mike Hibler, mike at cs.utah.edu - thanks!
Also, merge UCB and Utah copyright texts back into one, as they
originally were.

Extra verification by snj@.

branches: 1.51.2; 1.51.4;
Collect cpu_info and friends and move to m68k/include/cpu.h
Add a define __HAVE_CPU_DATA_FIRST which means that cpu_data is the first
member in struct cpu_info.

fix PR 6724 - convert m68k options to defflag's. this means that
M680[12346] are now available from opt_m68k_arch.h. FPSP meantioned
in the PR has already been fixed, and i could not find any more.

i built these kernels to ensure i did not break their builds:

amiga: GENERIC DRACO
atari: HADES FALCON MILAN-PCIIDE
mac68k: GENERIC
sun2: GENERIC
sun3: GENERIC GENERIC3X
cesfic: attempted GENERIC, does not build due to lack of machine/bus.h
hp300: GENERIC
luna68k: GENERIC
mvme68k: GENERIC
news68k: GENERIC
next68k: GENERIC
x68k: GENERIC

branches: 1.49.2; 1.49.4;
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>.

Purge x68k_config_found() to simplify consinit routine.
config_console() calls initialization of grf, ite, mfp
directly, instead of tracing special device tree with an
emulated 'struct device'.

Sync with other m68k ports.
- Remove PHYS_IODEV, PHYS_INTIODEV. These are real copy of INTIOBASE.
- Define IIOV() (and IIOP()) and use it, rather than INTIO_ADDR().

Move external decl. of intiobase: dev/intiovar.h -> include/cpu.h
Move definition of intiobase: x68k/pmap_bootstrap.c -> x68k/locore.s
These synchronize code with other m68k ports.

branches: 1.45.4; 1.45.12;
Remove CTL_MACHDEP_NAMES, it's not used anywhere.

Ok by martin@.

branches: 1.44.12; 1.44.16;
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: 1.43.2;
Add ci_cpuid where it's missing.

branches: 1.42.2; 1.42.4; 1.42.8;
Move declarations of m68k common functions
from <machine/cpu.h> to <m68k/m68k.h>.
While here, remove some obsolete function decls.

Add missing call to lwp_startup() in lwp_trampoline() (which was renamed
from proc_trampoline to match the other ports).

A DIAGNOSTIC kernel will now boot and run. LOCKDEBUG still doesn't work yet.
Also, my amiga no longer loses time.

Use do { } while (0) to macro.

Adapt to the merge of yamt-idlelwp branch.
tested on my X68030.

branches: 1.38.2; 1.38.4; 1.38.10;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.37.2;
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 newlock2 to head.

branches: 1.35.20;
merge ktrace-lwp.

branches: 1.34.2;
Change the signature of badaddr() and badbaddr() from taking a caddr_t
to taking a volatile void*. This gets rid of a number of casts to make
this compile under -Wcast-qual.
Add some volatiles and consts in other places to make this build under
-Wcast-qual.
Also rename a few variables to make this build under -Wshadow.
Also get rid of duplicated declarations of badaddr() and badbaddr()
in machdep.c, they're already there from <machine/cpu.h>.

de-__P, remove register, ansify.

branches: 1.32.4;
don't expose cpu_info to userland.

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

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: 1.28.2;
Merge the nathanw_sa branch.

untangle includes a bit:
don't include cpu.h in pmap.h, nor cacheops.h in cpu.h. instead,
include cpu.h and cacheops.h in just those .c files that need them.

branches: 1.26.8;
use _KERNEL_OPT

branches: 1.25.2;
Unification of the m68k syscall() function.

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.

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.

Do not include opt_m680x0 in LKM.

defopt M680[2346]0.

branches: 1.20.2;
Use m68k common cacheops.c.

Define cpu_number() as discussed on tech-smp.

Use mvme68k-derived delay routine.
Now that we support various models, the old constant-loop delay routine
may cause problems.

branches: 1.17.2; 1.17.4; 1.17.6;
Shut up gcc -Wall.

Merged minoura_x68k_bus_h branch.

synchronize types, and s/curproc/p/ in one forgotten place

x68k specific part of fix for PR 6152

branches: 1.13.2;
Splitted out the interrupt handling code to a separate file.
Disallow getting down the interrupt level by splXX.

Changes to support fork_kthread():
- cpu_set_kpc() now takes void *arg third argument, passed to the
entry point.
- cpu_fork() allows parent to be non-curproc iff parent is proc0.
When forking non-curproc, assume its state has already been saved.
- Adjust various pieces of machine-dependent code to account of all of this.

Oops, back out a buglet I didn't intend to commit in the last change.

configure() prototype is in <sys/device.h>

Eliminated vm_offset_t and vm_size_t.

Avoid declaring the "astpending" and "want_resched" globals in cpu.h,
as this breaks C++ code that happens to indirectly include this header.
Both Matthias Scheler and I noticed this, independently.

This problem notably does not affect the atari and sun3/sun3x ports,
which have already implemented a similar solution.

Make these compile after m68k/m68k.h 1.4->1.5.

Add prototypes.

branches: 1.5.8;
Remove #ifdef GENERIC ... #endif

Add fpu_probe prototype.

Use <m68k/cpu.h>.

Some cleanup.
- Add missing return-type of function.
- Add missing prototype.
- some gcc -Wall printf warning.

branches: 1.1.1;
Initial revision

Largely unify the <machine/cpu.h> headers on the m68k platforms.

Switch the x68k port to use the same clockframe layout as the other
m68k ports.

Make the M68K_MMU_* defines real kernel options, available in opt_m68k_arch.h.
For 68030, 68040, and 68060, infer M68K_MMU_MOTOROLA. For 68010 and 68020, it
must be an explicit option (set in std.${MACHINE} or, in the case of hp300,
inferred from the specific model option).

Remove duplicated / slightly-tweaked loadustp() (load user segment table)
routines from all of the m68k ports using the shared pmap. Instead, in
pmap_init(), set up a function pointer to the appropriate mmu_load_urp*()
function in mmu_subr.s.

TAB/space/indent cleanup.

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().

Refactor the 68040 writeback() from each m68k port's trap handler into a
shared copy: m68040_writeback(). It is essentially a copy of the Atari
version, with some minor cosmetic tweaks and one small performance optimization
from the mvme68k port.

Tested by rjs@ on a Quadra 950. (Thanks!)

- 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: 1.59.14; 1.59.16;
Fix typo "one the" and architecture where appropriate.

branches: 1.58.4; 1.58.8;
Remove the variable not used anymore.
sync with x68k/pmap_bootstrap.c,v 1.21 (in 2001).

branches: 1.57.2;
make cpu_need_resched() macros consistent; __USE flags

branches: 1.56.6; 1.56.10;
Always include <m68k/cpu.h> (i.e. outside #if defined(_KERNEL))
for crash(8) as amiga and sun3. There are _KERNEL protections in it.

Briefly tested by "build.sh -m news68k -U build".
Further possible botch will be fixed later.

branches: 1.55.4;
Merge copy-and-pasted fpu_probe() function (to share it among more m68k ports).
Tested on TT030, Sun3/80, and X68030.

branches: 1.54.4;
- merge and move pasted m68k MD setreg() functions into m68k/m68k_machdep.c
- move m68881_save() and m68881_restore() declarations into <m68k/m68k.h>

Briefly tested and no obvious breakage on atari, sun3, and x68k.

Make intiobase and intiolimit unsigned for consistency.

Remove clause 3 (UCB advertising clause) from the University of Utah
copyright. Confirmed by Mike Hibler, mike at cs.utah.edu - thanks!
Also, merge UCB and Utah copyright texts back into one, as they
originally were.

Extra verification by snj@.

branches: 1.51.2; 1.51.4;
Collect cpu_info and friends and move to m68k/include/cpu.h
Add a define __HAVE_CPU_DATA_FIRST which means that cpu_data is the first
member in struct cpu_info.

fix PR 6724 - convert m68k options to defflag's. this means that
M680[12346] are now available from opt_m68k_arch.h. FPSP meantioned
in the PR has already been fixed, and i could not find any more.

i built these kernels to ensure i did not break their builds:

amiga: GENERIC DRACO
atari: HADES FALCON MILAN-PCIIDE
mac68k: GENERIC
sun2: GENERIC
sun3: GENERIC GENERIC3X
cesfic: attempted GENERIC, does not build due to lack of machine/bus.h
hp300: GENERIC
luna68k: GENERIC
mvme68k: GENERIC
news68k: GENERIC
next68k: GENERIC
x68k: GENERIC

branches: 1.49.2; 1.49.4;
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>.

Purge x68k_config_found() to simplify consinit routine.
config_console() calls initialization of grf, ite, mfp
directly, instead of tracing special device tree with an
emulated 'struct device'.

Sync with other m68k ports.
- Remove PHYS_IODEV, PHYS_INTIODEV. These are real copy of INTIOBASE.
- Define IIOV() (and IIOP()) and use it, rather than INTIO_ADDR().

Move external decl. of intiobase: dev/intiovar.h -> include/cpu.h
Move definition of intiobase: x68k/pmap_bootstrap.c -> x68k/locore.s
These synchronize code with other m68k ports.

branches: 1.45.4; 1.45.12;
Remove CTL_MACHDEP_NAMES, it's not used anywhere.

Ok by martin@.

branches: 1.44.12; 1.44.16;
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: 1.43.2;
Add ci_cpuid where it's missing.

branches: 1.42.2; 1.42.4; 1.42.8;
Move declarations of m68k common functions
from <machine/cpu.h> to <m68k/m68k.h>.
While here, remove some obsolete function decls.

Add missing call to lwp_startup() in lwp_trampoline() (which was renamed
from proc_trampoline to match the other ports).

A DIAGNOSTIC kernel will now boot and run. LOCKDEBUG still doesn't work yet.
Also, my amiga no longer loses time.

Use do { } while (0) to macro.

Adapt to the merge of yamt-idlelwp branch.
tested on my X68030.

branches: 1.38.2; 1.38.4; 1.38.10;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.37.2;
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 newlock2 to head.

branches: 1.35.20;
merge ktrace-lwp.

branches: 1.34.2;
Change the signature of badaddr() and badbaddr() from taking a caddr_t
to taking a volatile void*. This gets rid of a number of casts to make
this compile under -Wcast-qual.
Add some volatiles and consts in other places to make this build under
-Wcast-qual.
Also rename a few variables to make this build under -Wshadow.
Also get rid of duplicated declarations of badaddr() and badbaddr()
in machdep.c, they're already there from <machine/cpu.h>.

de-__P, remove register, ansify.

branches: 1.32.4;
don't expose cpu_info to userland.

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

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: 1.28.2;
Merge the nathanw_sa branch.

untangle includes a bit:
don't include cpu.h in pmap.h, nor cacheops.h in cpu.h. instead,
include cpu.h and cacheops.h in just those .c files that need them.

branches: 1.26.8;
use _KERNEL_OPT

branches: 1.25.2;
Unification of the m68k syscall() function.

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.

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.

Do not include opt_m680x0 in LKM.

defopt M680[2346]0.

branches: 1.20.2;
Use m68k common cacheops.c.

Define cpu_number() as discussed on tech-smp.

Use mvme68k-derived delay routine.
Now that we support various models, the old constant-loop delay routine
may cause problems.

branches: 1.17.2; 1.17.4; 1.17.6;
Shut up gcc -Wall.

Merged minoura_x68k_bus_h branch.

synchronize types, and s/curproc/p/ in one forgotten place

x68k specific part of fix for PR 6152

branches: 1.13.2;
Splitted out the interrupt handling code to a separate file.
Disallow getting down the interrupt level by splXX.

Changes to support fork_kthread():
- cpu_set_kpc() now takes void *arg third argument, passed to the
entry point.
- cpu_fork() allows parent to be non-curproc iff parent is proc0.
When forking non-curproc, assume its state has already been saved.
- Adjust various pieces of machine-dependent code to account of all of this.

Oops, back out a buglet I didn't intend to commit in the last change.

configure() prototype is in <sys/device.h>

Eliminated vm_offset_t and vm_size_t.

Avoid declaring the "astpending" and "want_resched" globals in cpu.h,
as this breaks C++ code that happens to indirectly include this header.
Both Matthias Scheler and I noticed this, independently.

This problem notably does not affect the atari and sun3/sun3x ports,
which have already implemented a similar solution.

Make these compile after m68k/m68k.h 1.4->1.5.

Add prototypes.

branches: 1.5.8;
Remove #ifdef GENERIC ... #endif

Add fpu_probe prototype.

Use <m68k/cpu.h>.

Some cleanup.
- Add missing return-type of function.
- Add missing prototype.
- some gcc -Wall printf warning.

branches: 1.1.1;
Initial revision

Remove duplicated / slightly-tweaked loadustp() (load user segment table)
routines from all of the m68k ports using the shared pmap. Instead, in
pmap_init(), set up a function pointer to the appropriate mmu_load_urp*()
function in mmu_subr.s.

TAB/space/indent cleanup.

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().

Refactor the 68040 writeback() from each m68k port's trap handler into a
shared copy: m68040_writeback(). It is essentially a copy of the Atari
version, with some minor cosmetic tweaks and one small performance optimization
from the mvme68k port.

Tested by rjs@ on a Quadra 950. (Thanks!)

- 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: 1.59.14; 1.59.16;
Fix typo "one the" and architecture where appropriate.

branches: 1.58.4; 1.58.8;
Remove the variable not used anymore.
sync with x68k/pmap_bootstrap.c,v 1.21 (in 2001).

branches: 1.57.2;
make cpu_need_resched() macros consistent; __USE flags

branches: 1.56.6; 1.56.10;
Always include <m68k/cpu.h> (i.e. outside #if defined(_KERNEL))
for crash(8) as amiga and sun3. There are _KERNEL protections in it.

Briefly tested by "build.sh -m news68k -U build".
Further possible botch will be fixed later.

branches: 1.55.4;
Merge copy-and-pasted fpu_probe() function (to share it among more m68k ports).
Tested on TT030, Sun3/80, and X68030.

branches: 1.54.4;
- merge and move pasted m68k MD setreg() functions into m68k/m68k_machdep.c
- move m68881_save() and m68881_restore() declarations into <m68k/m68k.h>

Briefly tested and no obvious breakage on atari, sun3, and x68k.

Make intiobase and intiolimit unsigned for consistency.

Remove clause 3 (UCB advertising clause) from the University of Utah
copyright. Confirmed by Mike Hibler, mike at cs.utah.edu - thanks!
Also, merge UCB and Utah copyright texts back into one, as they
originally were.

Extra verification by snj@.

branches: 1.51.2; 1.51.4;
Collect cpu_info and friends and move to m68k/include/cpu.h
Add a define __HAVE_CPU_DATA_FIRST which means that cpu_data is the first
member in struct cpu_info.

fix PR 6724 - convert m68k options to defflag's. this means that
M680[12346] are now available from opt_m68k_arch.h. FPSP meantioned
in the PR has already been fixed, and i could not find any more.

i built these kernels to ensure i did not break their builds:

amiga: GENERIC DRACO
atari: HADES FALCON MILAN-PCIIDE
mac68k: GENERIC
sun2: GENERIC
sun3: GENERIC GENERIC3X
cesfic: attempted GENERIC, does not build due to lack of machine/bus.h
hp300: GENERIC
luna68k: GENERIC
mvme68k: GENERIC
news68k: GENERIC
next68k: GENERIC
x68k: GENERIC

branches: 1.49.2; 1.49.4;
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>.

Purge x68k_config_found() to simplify consinit routine.
config_console() calls initialization of grf, ite, mfp
directly, instead of tracing special device tree with an
emulated 'struct device'.

Sync with other m68k ports.
- Remove PHYS_IODEV, PHYS_INTIODEV. These are real copy of INTIOBASE.
- Define IIOV() (and IIOP()) and use it, rather than INTIO_ADDR().

Move external decl. of intiobase: dev/intiovar.h -> include/cpu.h
Move definition of intiobase: x68k/pmap_bootstrap.c -> x68k/locore.s
These synchronize code with other m68k ports.

branches: 1.45.4; 1.45.12;
Remove CTL_MACHDEP_NAMES, it's not used anywhere.

Ok by martin@.

branches: 1.44.12; 1.44.16;
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: 1.43.2;
Add ci_cpuid where it's missing.

branches: 1.42.2; 1.42.4; 1.42.8;
Move declarations of m68k common functions
from <machine/cpu.h> to <m68k/m68k.h>.
While here, remove some obsolete function decls.

Add missing call to lwp_startup() in lwp_trampoline() (which was renamed
from proc_trampoline to match the other ports).

A DIAGNOSTIC kernel will now boot and run. LOCKDEBUG still doesn't work yet.
Also, my amiga no longer loses time.

Use do { } while (0) to macro.

Adapt to the merge of yamt-idlelwp branch.
tested on my X68030.

branches: 1.38.2; 1.38.4; 1.38.10;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.37.2;
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 newlock2 to head.

branches: 1.35.20;
merge ktrace-lwp.

branches: 1.34.2;
Change the signature of badaddr() and badbaddr() from taking a caddr_t
to taking a volatile void*. This gets rid of a number of casts to make
this compile under -Wcast-qual.
Add some volatiles and consts in other places to make this build under
-Wcast-qual.
Also rename a few variables to make this build under -Wshadow.
Also get rid of duplicated declarations of badaddr() and badbaddr()
in machdep.c, they're already there from <machine/cpu.h>.

de-__P, remove register, ansify.

branches: 1.32.4;
don't expose cpu_info to userland.

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

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: 1.28.2;
Merge the nathanw_sa branch.

untangle includes a bit:
don't include cpu.h in pmap.h, nor cacheops.h in cpu.h. instead,
include cpu.h and cacheops.h in just those .c files that need them.

branches: 1.26.8;
use _KERNEL_OPT

branches: 1.25.2;
Unification of the m68k syscall() function.

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.

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.

Do not include opt_m680x0 in LKM.

defopt M680[2346]0.

branches: 1.20.2;
Use m68k common cacheops.c.

Define cpu_number() as discussed on tech-smp.

Use mvme68k-derived delay routine.
Now that we support various models, the old constant-loop delay routine
may cause problems.

branches: 1.17.2; 1.17.4; 1.17.6;
Shut up gcc -Wall.

Merged minoura_x68k_bus_h branch.

synchronize types, and s/curproc/p/ in one forgotten place

x68k specific part of fix for PR 6152

branches: 1.13.2;
Splitted out the interrupt handling code to a separate file.
Disallow getting down the interrupt level by splXX.

Changes to support fork_kthread():
- cpu_set_kpc() now takes void *arg third argument, passed to the
entry point.
- cpu_fork() allows parent to be non-curproc iff parent is proc0.
When forking non-curproc, assume its state has already been saved.
- Adjust various pieces of machine-dependent code to account of all of this.

Oops, back out a buglet I didn't intend to commit in the last change.

configure() prototype is in <sys/device.h>

Eliminated vm_offset_t and vm_size_t.

Avoid declaring the "astpending" and "want_resched" globals in cpu.h,
as this breaks C++ code that happens to indirectly include this header.
Both Matthias Scheler and I noticed this, independently.

This problem notably does not affect the atari and sun3/sun3x ports,
which have already implemented a similar solution.

Make these compile after m68k/m68k.h 1.4->1.5.

Add prototypes.

branches: 1.5.8;
Remove #ifdef GENERIC ... #endif

Add fpu_probe prototype.

Use <m68k/cpu.h>.

Some cleanup.
- Add missing return-type of function.
- Add missing prototype.
- some gcc -Wall printf warning.

branches: 1.1.1;
Initial revision

TAB/space/indent cleanup.

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().

Refactor the 68040 writeback() from each m68k port's trap handler into a
shared copy: m68040_writeback(). It is essentially a copy of the Atari
version, with some minor cosmetic tweaks and one small performance optimization
from the mvme68k port.

Tested by rjs@ on a Quadra 950. (Thanks!)

- 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: 1.59.14; 1.59.16;
Fix typo "one the" and architecture where appropriate.

branches: 1.58.4; 1.58.8;
Remove the variable not used anymore.
sync with x68k/pmap_bootstrap.c,v 1.21 (in 2001).

branches: 1.57.2;
make cpu_need_resched() macros consistent; __USE flags

branches: 1.56.6; 1.56.10;
Always include <m68k/cpu.h> (i.e. outside #if defined(_KERNEL))
for crash(8) as amiga and sun3. There are _KERNEL protections in it.

Briefly tested by "build.sh -m news68k -U build".
Further possible botch will be fixed later.

branches: 1.55.4;
Merge copy-and-pasted fpu_probe() function (to share it among more m68k ports).
Tested on TT030, Sun3/80, and X68030.

branches: 1.54.4;
- merge and move pasted m68k MD setreg() functions into m68k/m68k_machdep.c
- move m68881_save() and m68881_restore() declarations into <m68k/m68k.h>

Briefly tested and no obvious breakage on atari, sun3, and x68k.

Make intiobase and intiolimit unsigned for consistency.

Remove clause 3 (UCB advertising clause) from the University of Utah
copyright. Confirmed by Mike Hibler, mike at cs.utah.edu - thanks!
Also, merge UCB and Utah copyright texts back into one, as they
originally were.

Extra verification by snj@.

branches: 1.51.2; 1.51.4;
Collect cpu_info and friends and move to m68k/include/cpu.h
Add a define __HAVE_CPU_DATA_FIRST which means that cpu_data is the first
member in struct cpu_info.

fix PR 6724 - convert m68k options to defflag's. this means that
M680[12346] are now available from opt_m68k_arch.h. FPSP meantioned
in the PR has already been fixed, and i could not find any more.

i built these kernels to ensure i did not break their builds:

amiga: GENERIC DRACO
atari: HADES FALCON MILAN-PCIIDE
mac68k: GENERIC
sun2: GENERIC
sun3: GENERIC GENERIC3X
cesfic: attempted GENERIC, does not build due to lack of machine/bus.h
hp300: GENERIC
luna68k: GENERIC
mvme68k: GENERIC
news68k: GENERIC
next68k: GENERIC
x68k: GENERIC

branches: 1.49.2; 1.49.4;
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>.

Purge x68k_config_found() to simplify consinit routine.
config_console() calls initialization of grf, ite, mfp
directly, instead of tracing special device tree with an
emulated 'struct device'.

Sync with other m68k ports.
- Remove PHYS_IODEV, PHYS_INTIODEV. These are real copy of INTIOBASE.
- Define IIOV() (and IIOP()) and use it, rather than INTIO_ADDR().

Move external decl. of intiobase: dev/intiovar.h -> include/cpu.h
Move definition of intiobase: x68k/pmap_bootstrap.c -> x68k/locore.s
These synchronize code with other m68k ports.

branches: 1.45.4; 1.45.12;
Remove CTL_MACHDEP_NAMES, it's not used anywhere.

Ok by martin@.

branches: 1.44.12; 1.44.16;
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: 1.43.2;
Add ci_cpuid where it's missing.

branches: 1.42.2; 1.42.4; 1.42.8;
Move declarations of m68k common functions
from <machine/cpu.h> to <m68k/m68k.h>.
While here, remove some obsolete function decls.

Add missing call to lwp_startup() in lwp_trampoline() (which was renamed
from proc_trampoline to match the other ports).

A DIAGNOSTIC kernel will now boot and run. LOCKDEBUG still doesn't work yet.
Also, my amiga no longer loses time.

Use do { } while (0) to macro.

Adapt to the merge of yamt-idlelwp branch.
tested on my X68030.

branches: 1.38.2; 1.38.4; 1.38.10;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.37.2;
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 newlock2 to head.

branches: 1.35.20;
merge ktrace-lwp.

branches: 1.34.2;
Change the signature of badaddr() and badbaddr() from taking a caddr_t
to taking a volatile void*. This gets rid of a number of casts to make
this compile under -Wcast-qual.
Add some volatiles and consts in other places to make this build under
-Wcast-qual.
Also rename a few variables to make this build under -Wshadow.
Also get rid of duplicated declarations of badaddr() and badbaddr()
in machdep.c, they're already there from <machine/cpu.h>.

de-__P, remove register, ansify.

branches: 1.32.4;
don't expose cpu_info to userland.

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

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: 1.28.2;
Merge the nathanw_sa branch.

untangle includes a bit:
don't include cpu.h in pmap.h, nor cacheops.h in cpu.h. instead,
include cpu.h and cacheops.h in just those .c files that need them.

branches: 1.26.8;
use _KERNEL_OPT

branches: 1.25.2;
Unification of the m68k syscall() function.

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.

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.

Do not include opt_m680x0 in LKM.

defopt M680[2346]0.

branches: 1.20.2;
Use m68k common cacheops.c.

Define cpu_number() as discussed on tech-smp.

Use mvme68k-derived delay routine.
Now that we support various models, the old constant-loop delay routine
may cause problems.

branches: 1.17.2; 1.17.4; 1.17.6;
Shut up gcc -Wall.

Merged minoura_x68k_bus_h branch.

synchronize types, and s/curproc/p/ in one forgotten place

x68k specific part of fix for PR 6152

branches: 1.13.2;
Splitted out the interrupt handling code to a separate file.
Disallow getting down the interrupt level by splXX.

Changes to support fork_kthread():
- cpu_set_kpc() now takes void *arg third argument, passed to the
entry point.
- cpu_fork() allows parent to be non-curproc iff parent is proc0.
When forking non-curproc, assume its state has already been saved.
- Adjust various pieces of machine-dependent code to account of all of this.

Oops, back out a buglet I didn't intend to commit in the last change.

configure() prototype is in <sys/device.h>

Eliminated vm_offset_t and vm_size_t.

Avoid declaring the "astpending" and "want_resched" globals in cpu.h,
as this breaks C++ code that happens to indirectly include this header.
Both Matthias Scheler and I noticed this, independently.

This problem notably does not affect the atari and sun3/sun3x ports,
which have already implemented a similar solution.

Make these compile after m68k/m68k.h 1.4->1.5.

Add prototypes.

branches: 1.5.8;
Remove #ifdef GENERIC ... #endif

Add fpu_probe prototype.

Use <m68k/cpu.h>.

Some cleanup.
- Add missing return-type of function.
- Add missing prototype.
- some gcc -Wall printf warning.

branches: 1.1.1;
Initial revision

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().

Refactor the 68040 writeback() from each m68k port's trap handler into a
shared copy: m68040_writeback(). It is essentially a copy of the Atari
version, with some minor cosmetic tweaks and one small performance optimization
from the mvme68k port.

Tested by rjs@ on a Quadra 950. (Thanks!)

- 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: 1.59.14; 1.59.16;
Fix typo "one the" and architecture where appropriate.

branches: 1.58.4; 1.58.8;
Remove the variable not used anymore.
sync with x68k/pmap_bootstrap.c,v 1.21 (in 2001).

branches: 1.57.2;
make cpu_need_resched() macros consistent; __USE flags

branches: 1.56.6; 1.56.10;
Always include <m68k/cpu.h> (i.e. outside #if defined(_KERNEL))
for crash(8) as amiga and sun3. There are _KERNEL protections in it.

Briefly tested by "build.sh -m news68k -U build".
Further possible botch will be fixed later.

branches: 1.55.4;
Merge copy-and-pasted fpu_probe() function (to share it among more m68k ports).
Tested on TT030, Sun3/80, and X68030.

branches: 1.54.4;
- merge and move pasted m68k MD setreg() functions into m68k/m68k_machdep.c
- move m68881_save() and m68881_restore() declarations into <m68k/m68k.h>

Briefly tested and no obvious breakage on atari, sun3, and x68k.

Make intiobase and intiolimit unsigned for consistency.

Remove clause 3 (UCB advertising clause) from the University of Utah
copyright. Confirmed by Mike Hibler, mike at cs.utah.edu - thanks!
Also, merge UCB and Utah copyright texts back into one, as they
originally were.

Extra verification by snj@.

branches: 1.51.2; 1.51.4;
Collect cpu_info and friends and move to m68k/include/cpu.h
Add a define __HAVE_CPU_DATA_FIRST which means that cpu_data is the first
member in struct cpu_info.

fix PR 6724 - convert m68k options to defflag's. this means that
M680[12346] are now available from opt_m68k_arch.h. FPSP meantioned
in the PR has already been fixed, and i could not find any more.

i built these kernels to ensure i did not break their builds:

amiga: GENERIC DRACO
atari: HADES FALCON MILAN-PCIIDE
mac68k: GENERIC
sun2: GENERIC
sun3: GENERIC GENERIC3X
cesfic: attempted GENERIC, does not build due to lack of machine/bus.h
hp300: GENERIC
luna68k: GENERIC
mvme68k: GENERIC
news68k: GENERIC
next68k: GENERIC
x68k: GENERIC

branches: 1.49.2; 1.49.4;
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>.

Purge x68k_config_found() to simplify consinit routine.
config_console() calls initialization of grf, ite, mfp
directly, instead of tracing special device tree with an
emulated 'struct device'.

Sync with other m68k ports.
- Remove PHYS_IODEV, PHYS_INTIODEV. These are real copy of INTIOBASE.
- Define IIOV() (and IIOP()) and use it, rather than INTIO_ADDR().

Move external decl. of intiobase: dev/intiovar.h -> include/cpu.h
Move definition of intiobase: x68k/pmap_bootstrap.c -> x68k/locore.s
These synchronize code with other m68k ports.

branches: 1.45.4; 1.45.12;
Remove CTL_MACHDEP_NAMES, it's not used anywhere.

Ok by martin@.

branches: 1.44.12; 1.44.16;
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: 1.43.2;
Add ci_cpuid where it's missing.

branches: 1.42.2; 1.42.4; 1.42.8;
Move declarations of m68k common functions
from <machine/cpu.h> to <m68k/m68k.h>.
While here, remove some obsolete function decls.

Add missing call to lwp_startup() in lwp_trampoline() (which was renamed
from proc_trampoline to match the other ports).

A DIAGNOSTIC kernel will now boot and run. LOCKDEBUG still doesn't work yet.
Also, my amiga no longer loses time.

Use do { } while (0) to macro.

Adapt to the merge of yamt-idlelwp branch.
tested on my X68030.

branches: 1.38.2; 1.38.4; 1.38.10;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.37.2;
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 newlock2 to head.

branches: 1.35.20;
merge ktrace-lwp.

branches: 1.34.2;
Change the signature of badaddr() and badbaddr() from taking a caddr_t
to taking a volatile void*. This gets rid of a number of casts to make
this compile under -Wcast-qual.
Add some volatiles and consts in other places to make this build under
-Wcast-qual.
Also rename a few variables to make this build under -Wshadow.
Also get rid of duplicated declarations of badaddr() and badbaddr()
in machdep.c, they're already there from <machine/cpu.h>.

de-__P, remove register, ansify.

branches: 1.32.4;
don't expose cpu_info to userland.

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

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: 1.28.2;
Merge the nathanw_sa branch.

untangle includes a bit:
don't include cpu.h in pmap.h, nor cacheops.h in cpu.h. instead,
include cpu.h and cacheops.h in just those .c files that need them.

branches: 1.26.8;
use _KERNEL_OPT

branches: 1.25.2;
Unification of the m68k syscall() function.

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.

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.

Do not include opt_m680x0 in LKM.

defopt M680[2346]0.

branches: 1.20.2;
Use m68k common cacheops.c.

Define cpu_number() as discussed on tech-smp.

Use mvme68k-derived delay routine.
Now that we support various models, the old constant-loop delay routine
may cause problems.

branches: 1.17.2; 1.17.4; 1.17.6;
Shut up gcc -Wall.

Merged minoura_x68k_bus_h branch.

synchronize types, and s/curproc/p/ in one forgotten place

x68k specific part of fix for PR 6152

branches: 1.13.2;
Splitted out the interrupt handling code to a separate file.
Disallow getting down the interrupt level by splXX.

Changes to support fork_kthread():
- cpu_set_kpc() now takes void *arg third argument, passed to the
entry point.
- cpu_fork() allows parent to be non-curproc iff parent is proc0.
When forking non-curproc, assume its state has already been saved.
- Adjust various pieces of machine-dependent code to account of all of this.

Oops, back out a buglet I didn't intend to commit in the last change.

configure() prototype is in <sys/device.h>

Eliminated vm_offset_t and vm_size_t.

Avoid declaring the "astpending" and "want_resched" globals in cpu.h,
as this breaks C++ code that happens to indirectly include this header.
Both Matthias Scheler and I noticed this, independently.

This problem notably does not affect the atari and sun3/sun3x ports,
which have already implemented a similar solution.

Make these compile after m68k/m68k.h 1.4->1.5.

Add prototypes.

branches: 1.5.8;
Remove #ifdef GENERIC ... #endif

Add fpu_probe prototype.

Use <m68k/cpu.h>.

Some cleanup.
- Add missing return-type of function.
- Add missing prototype.
- some gcc -Wall printf warning.

branches: 1.1.1;
Initial revision

Refactor the 68040 writeback() from each m68k port's trap handler into a
shared copy: m68040_writeback(). It is essentially a copy of the Atari
version, with some minor cosmetic tweaks and one small performance optimization
from the mvme68k port.

Tested by rjs@ on a Quadra 950. (Thanks!)

- 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: 1.59.14;
Fix typo "one the" and architecture where appropriate.

branches: 1.58.4; 1.58.8;
Remove the variable not used anymore.
sync with x68k/pmap_bootstrap.c,v 1.21 (in 2001).

branches: 1.57.2;
make cpu_need_resched() macros consistent; __USE flags

branches: 1.56.6; 1.56.10;
Always include <m68k/cpu.h> (i.e. outside #if defined(_KERNEL))
for crash(8) as amiga and sun3. There are _KERNEL protections in it.

Briefly tested by "build.sh -m news68k -U build".
Further possible botch will be fixed later.

branches: 1.55.4;
Merge copy-and-pasted fpu_probe() function (to share it among more m68k ports).
Tested on TT030, Sun3/80, and X68030.

branches: 1.54.4;
- merge and move pasted m68k MD setreg() functions into m68k/m68k_machdep.c
- move m68881_save() and m68881_restore() declarations into <m68k/m68k.h>

Briefly tested and no obvious breakage on atari, sun3, and x68k.

Make intiobase and intiolimit unsigned for consistency.

Remove clause 3 (UCB advertising clause) from the University of Utah
copyright. Confirmed by Mike Hibler, mike at cs.utah.edu - thanks!
Also, merge UCB and Utah copyright texts back into one, as they
originally were.

Extra verification by snj@.

branches: 1.51.2; 1.51.4;
Collect cpu_info and friends and move to m68k/include/cpu.h
Add a define __HAVE_CPU_DATA_FIRST which means that cpu_data is the first
member in struct cpu_info.

fix PR 6724 - convert m68k options to defflag's. this means that
M680[12346] are now available from opt_m68k_arch.h. FPSP meantioned
in the PR has already been fixed, and i could not find any more.

i built these kernels to ensure i did not break their builds:

amiga: GENERIC DRACO
atari: HADES FALCON MILAN-PCIIDE
mac68k: GENERIC
sun2: GENERIC
sun3: GENERIC GENERIC3X
cesfic: attempted GENERIC, does not build due to lack of machine/bus.h
hp300: GENERIC
luna68k: GENERIC
mvme68k: GENERIC
news68k: GENERIC
next68k: GENERIC
x68k: GENERIC

branches: 1.49.2; 1.49.4;
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>.

Purge x68k_config_found() to simplify consinit routine.
config_console() calls initialization of grf, ite, mfp
directly, instead of tracing special device tree with an
emulated 'struct device'.

Sync with other m68k ports.
- Remove PHYS_IODEV, PHYS_INTIODEV. These are real copy of INTIOBASE.
- Define IIOV() (and IIOP()) and use it, rather than INTIO_ADDR().

Move external decl. of intiobase: dev/intiovar.h -> include/cpu.h
Move definition of intiobase: x68k/pmap_bootstrap.c -> x68k/locore.s
These synchronize code with other m68k ports.

branches: 1.45.4; 1.45.12;
Remove CTL_MACHDEP_NAMES, it's not used anywhere.

Ok by martin@.

branches: 1.44.12; 1.44.16;
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: 1.43.2;
Add ci_cpuid where it's missing.

branches: 1.42.2; 1.42.4; 1.42.8;
Move declarations of m68k common functions
from <machine/cpu.h> to <m68k/m68k.h>.
While here, remove some obsolete function decls.

Add missing call to lwp_startup() in lwp_trampoline() (which was renamed
from proc_trampoline to match the other ports).

A DIAGNOSTIC kernel will now boot and run. LOCKDEBUG still doesn't work yet.
Also, my amiga no longer loses time.

Use do { } while (0) to macro.

Adapt to the merge of yamt-idlelwp branch.
tested on my X68030.

branches: 1.38.2; 1.38.4; 1.38.10;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.37.2;
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 newlock2 to head.

branches: 1.35.20;
merge ktrace-lwp.

branches: 1.34.2;
Change the signature of badaddr() and badbaddr() from taking a caddr_t
to taking a volatile void*. This gets rid of a number of casts to make
this compile under -Wcast-qual.
Add some volatiles and consts in other places to make this build under
-Wcast-qual.
Also rename a few variables to make this build under -Wshadow.
Also get rid of duplicated declarations of badaddr() and badbaddr()
in machdep.c, they're already there from <machine/cpu.h>.

de-__P, remove register, ansify.

branches: 1.32.4;
don't expose cpu_info to userland.

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

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: 1.28.2;
Merge the nathanw_sa branch.

untangle includes a bit:
don't include cpu.h in pmap.h, nor cacheops.h in cpu.h. instead,
include cpu.h and cacheops.h in just those .c files that need them.

branches: 1.26.8;
use _KERNEL_OPT

branches: 1.25.2;
Unification of the m68k syscall() function.

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.

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.

Do not include opt_m680x0 in LKM.

defopt M680[2346]0.

branches: 1.20.2;
Use m68k common cacheops.c.

Define cpu_number() as discussed on tech-smp.

Use mvme68k-derived delay routine.
Now that we support various models, the old constant-loop delay routine
may cause problems.

branches: 1.17.2; 1.17.4; 1.17.6;
Shut up gcc -Wall.

Merged minoura_x68k_bus_h branch.

synchronize types, and s/curproc/p/ in one forgotten place

x68k specific part of fix for PR 6152

branches: 1.13.2;
Splitted out the interrupt handling code to a separate file.
Disallow getting down the interrupt level by splXX.

Changes to support fork_kthread():
- cpu_set_kpc() now takes void *arg third argument, passed to the
entry point.
- cpu_fork() allows parent to be non-curproc iff parent is proc0.
When forking non-curproc, assume its state has already been saved.
- Adjust various pieces of machine-dependent code to account of all of this.

Oops, back out a buglet I didn't intend to commit in the last change.

configure() prototype is in <sys/device.h>

Eliminated vm_offset_t and vm_size_t.

Avoid declaring the "astpending" and "want_resched" globals in cpu.h,
as this breaks C++ code that happens to indirectly include this header.
Both Matthias Scheler and I noticed this, independently.

This problem notably does not affect the atari and sun3/sun3x ports,
which have already implemented a similar solution.

Make these compile after m68k/m68k.h 1.4->1.5.

Add prototypes.

branches: 1.5.8;
Remove #ifdef GENERIC ... #endif

Add fpu_probe prototype.

Use <m68k/cpu.h>.

Some cleanup.
- Add missing return-type of function.
- Add missing prototype.
- some gcc -Wall printf warning.

branches: 1.1.1;
Initial revision

Fix typo "one the" and architecture where appropriate.