Normally context switches happen in mi_switch() but there are 3 cases
where a switch happens outside. Cleanup these code paths and make the
machine independent.

- when a process forks (fork, tfork, kthread), the new proc needs to
somehow be scheduled for the first time. This is done by proc_trampoline.
Since proc_trampoline is machine dependent assembler code change
the MP specific proc_trampoline_mp() to proc_trampoline_mi() and make
sure it is now always called.
- cpu_hatch: when booting APs the code needs to jump to the first proc
running on that CPU. This should be the idle thread for that CPU.
- sched_exit: when a proc exits it needs to switch away from itself and
then instruct the reaper to clean up the rest. This is done by switching
to the idle loop.

Since the last two cases require a context switch to the idle proc factor
out the common code to sched_toidle() and use it in those places.

Tested by many on all archs.
OK miod@ mpi@ cheloha@

Remove p_rtime from struct proc and replace it by passing the timespec
as argument to the tuagg_locked function.

- Remove incorrect use of p_rtime in other parts of the tree. p_rtime was
almost always 0 so including it in any sum did not alter the result.
- In main() the update of time can be further simplified since at that time
only the primary cpu is running.
- Add missing nanouptime() call in cpu_hatch() for hppa
- Rename tuagg_unlocked to tuagg_locked like it is done in the rest of
the tree.

OK cheloha@ dlg@

all platforms, main(): call clockqueue_init() just before sched_init_cpu()

Move the clockqueue_init() call out of clockintr_cpu_init() and up
just before the sched_init_cpu() call for a given CPU.

This will allow sched_init_cpu() to allocate clockintr handles for a
given CPU's scheduler in a later patch.

Link: https://marc.info/?l=openbsd-tech&m=168661507607622&w=2

ok kettenis@, claudio@

hppa: switch to clockintr

- Remove hppa-specific clock interrupt scheduling bits from cpu_info.
- Rename cpu_hardclock() to itmr_intr(); it doesn't exclusively run
hardclock(9) anymore.
- Wire up itmr_intrclock.

hppa now has a randomized statclock(), stathz = hz.

Patch help, testing, and review from kettenis@ (B2000) and miod@ (C3650).
MP testing from guenther@ (dual-core J6700).

ok mlarkin@ kettenis@, "Ship it?" guenther@

Constify struct cfattach.

ok miod@

dev/rndvar.h no longer has statistical interfaces (removed during various
conversion steps). it only contains kernel prototypes for 4 interfaces,
all of which legitimately belong in sys/systm.h, which are already included
by all enqueue_randomness() users.

Initialize ci_randseed better using arc4random() + a trick. Remove the
libkern srandom() API since it is not suitable for this use.
ok kettenis miod

1 << 31 cleanup. Eitan Adler pointed out that there has been a
resurrection of the bad idiom in the tree.
sufficient review by miod, kettenis, tedu

Make need_resched() call cpu_unidle() such that we wake up a process running on
another CPU.

ok miod@

Implement cpu_unidle() for MP kernels.

ok kettenis@

Allow processes to be scheduled onto secondary CPUs.

ok kettenis@

Rename ci_spinup_stack to ci_stack and use it as the stack for both CPU
spin up and FPU emulation. Since all CPUs need a stack for FPU emulation,
move the allocation code to cpuattach().

ok kettenis@

Add support for IPIs on hppa.

ok kettenis@

Spin up secondary CPUs on hppa multiprocessor kernels. At this stage we
enable clock interrupts, however do not allow processes to be scheduled
onto the secondary CPUs - hopefully we can change this shortly...

ok kettenis@

Ansify functions and use "clock" rather than the CPU name for clock
interrupts.

ok kettenis@

Allow for multiple CPUs by moving to an array of cpu_info.

ok kettenis@

Allow a multiprocessor kernel to compile.

ok kettenis@

Move hppa to a "cpu0 at mainbus0" configuration, rather than knocking CPUs
out in the cpu match function. Whilst here also hardwire the clock to IRQ
31, thus preventing one from building a kernel without hardclock.

ok kettenis@ miod@

Make sure than cpu_hardclock() never sets a ``next interrupt value'' which has
already been hit by the running timer; this happens very often on oosiop-based
machines, due to these machines being among the slowest hppa, and oosiop
being interrupt greedy. Unfortunately, when this happened, one had to wait
for the timer to wrap, which would take up to 128 seconds on the 33MHz
machines.

Also, invoke hardclock() as many times as necessary if it turns out that
we had to delay the interrupt 1/hz seconds to avoid the aforementioned
wrap problem.

With help from kettenis@; ok kettenis@

fix new line in dmesg print on 8k cpus

simplify cache print a bit

store fpu version for later use. make sure to proper store/clear fpu state in fork/exec/exit/sendsig

do not print anything about btlb if there is none

update copyright; miod@ is fine w/ files where he holds it too

rework cpu identification

make all intr_establish take the same last arg for name

fix fpu printout and remove dead code piece

duh, provide a wrapper on the hardclock() since it's void

no wrapper arounf hardclock(), use CPU_CLOCKUPDATE, real microtime; miod ok

fetch fpu id per the book (even it works otherwise), also, hppa_mod_info() always returns some string; idea by fredette@

print parisc level w/ the the parisc version, not for each cpu

need to mask out the upper part for the fpu version on print

better cache mode print

no need for reg.h in the frame.h

First round of __P removal in sys

no need to mask

expand fpu name, makes line overflow a bit, maybe deal w/ it later

rearrange stuff, chat about cache

disable fpu on csw, print fpu version on cpu line, if present

branches: 1.8.8;
print cpu revision and type

add luseless comment

branches: 1.6.2;
shorter text, so it fits in 80 columns

evcnt count the interrupts, also optimize diagnostic printing

next try to print cpu model number.
attach clock interrupt.

print cpu ID (type) if available

better cpu capabilities printing.
print cpu PA level
move cpu_gethpa() to mainbus.c

some cpu

Remove p_rtime from struct proc and replace it by passing the timespec
as argument to the tuagg_locked function.

- Remove incorrect use of p_rtime in other parts of the tree. p_rtime was
almost always 0 so including it in any sum did not alter the result.
- In main() the update of time can be further simplified since at that time
only the primary cpu is running.
- Add missing nanouptime() call in cpu_hatch() for hppa
- Rename tuagg_unlocked to tuagg_locked like it is done in the rest of
the tree.

OK cheloha@ dlg@

all platforms, main(): call clockqueue_init() just before sched_init_cpu()

Move the clockqueue_init() call out of clockintr_cpu_init() and up
just before the sched_init_cpu() call for a given CPU.

This will allow sched_init_cpu() to allocate clockintr handles for a
given CPU's scheduler in a later patch.

Link: https://marc.info/?l=openbsd-tech&m=168661507607622&w=2

ok kettenis@, claudio@

hppa: switch to clockintr

- Remove hppa-specific clock interrupt scheduling bits from cpu_info.
- Rename cpu_hardclock() to itmr_intr(); it doesn't exclusively run
hardclock(9) anymore.
- Wire up itmr_intrclock.

hppa now has a randomized statclock(), stathz = hz.

Patch help, testing, and review from kettenis@ (B2000) and miod@ (C3650).
MP testing from guenther@ (dual-core J6700).

ok mlarkin@ kettenis@, "Ship it?" guenther@

Constify struct cfattach.

ok miod@

dev/rndvar.h no longer has statistical interfaces (removed during various
conversion steps). it only contains kernel prototypes for 4 interfaces,
all of which legitimately belong in sys/systm.h, which are already included
by all enqueue_randomness() users.

Initialize ci_randseed better using arc4random() + a trick. Remove the
libkern srandom() API since it is not suitable for this use.
ok kettenis miod

1 << 31 cleanup. Eitan Adler pointed out that there has been a
resurrection of the bad idiom in the tree.
sufficient review by miod, kettenis, tedu

Make need_resched() call cpu_unidle() such that we wake up a process running on
another CPU.

ok miod@

Implement cpu_unidle() for MP kernels.

ok kettenis@

Allow processes to be scheduled onto secondary CPUs.

ok kettenis@

Rename ci_spinup_stack to ci_stack and use it as the stack for both CPU
spin up and FPU emulation. Since all CPUs need a stack for FPU emulation,
move the allocation code to cpuattach().

ok kettenis@

Add support for IPIs on hppa.

ok kettenis@

Spin up secondary CPUs on hppa multiprocessor kernels. At this stage we
enable clock interrupts, however do not allow processes to be scheduled
onto the secondary CPUs - hopefully we can change this shortly...

ok kettenis@

Ansify functions and use "clock" rather than the CPU name for clock
interrupts.

ok kettenis@

Allow for multiple CPUs by moving to an array of cpu_info.

ok kettenis@

Allow a multiprocessor kernel to compile.

ok kettenis@

Move hppa to a "cpu0 at mainbus0" configuration, rather than knocking CPUs
out in the cpu match function. Whilst here also hardwire the clock to IRQ
31, thus preventing one from building a kernel without hardclock.

ok kettenis@ miod@

Make sure than cpu_hardclock() never sets a ``next interrupt value'' which has
already been hit by the running timer; this happens very often on oosiop-based
machines, due to these machines being among the slowest hppa, and oosiop
being interrupt greedy. Unfortunately, when this happened, one had to wait
for the timer to wrap, which would take up to 128 seconds on the 33MHz
machines.

Also, invoke hardclock() as many times as necessary if it turns out that
we had to delay the interrupt 1/hz seconds to avoid the aforementioned
wrap problem.

With help from kettenis@; ok kettenis@

fix new line in dmesg print on 8k cpus

simplify cache print a bit

store fpu version for later use. make sure to proper store/clear fpu state in fork/exec/exit/sendsig

do not print anything about btlb if there is none

update copyright; miod@ is fine w/ files where he holds it too

rework cpu identification

make all intr_establish take the same last arg for name

fix fpu printout and remove dead code piece

duh, provide a wrapper on the hardclock() since it's void

no wrapper arounf hardclock(), use CPU_CLOCKUPDATE, real microtime; miod ok

fetch fpu id per the book (even it works otherwise), also, hppa_mod_info() always returns some string; idea by fredette@

print parisc level w/ the the parisc version, not for each cpu

need to mask out the upper part for the fpu version on print

better cache mode print

no need for reg.h in the frame.h

First round of __P removal in sys

no need to mask

expand fpu name, makes line overflow a bit, maybe deal w/ it later

rearrange stuff, chat about cache

disable fpu on csw, print fpu version on cpu line, if present

branches: 1.8.8;
print cpu revision and type

add luseless comment

branches: 1.6.2;
shorter text, so it fits in 80 columns

evcnt count the interrupts, also optimize diagnostic printing

next try to print cpu model number.
attach clock interrupt.

print cpu ID (type) if available

better cpu capabilities printing.
print cpu PA level
move cpu_gethpa() to mainbus.c

some cpu

all platforms, main(): call clockqueue_init() just before sched_init_cpu()

Move the clockqueue_init() call out of clockintr_cpu_init() and up
just before the sched_init_cpu() call for a given CPU.

This will allow sched_init_cpu() to allocate clockintr handles for a
given CPU's scheduler in a later patch.

Link: https://marc.info/?l=openbsd-tech&m=168661507607622&w=2

ok kettenis@, claudio@

hppa: switch to clockintr

- Remove hppa-specific clock interrupt scheduling bits from cpu_info.
- Rename cpu_hardclock() to itmr_intr(); it doesn't exclusively run
hardclock(9) anymore.
- Wire up itmr_intrclock.

hppa now has a randomized statclock(), stathz = hz.

Patch help, testing, and review from kettenis@ (B2000) and miod@ (C3650).
MP testing from guenther@ (dual-core J6700).

ok mlarkin@ kettenis@, "Ship it?" guenther@

Constify struct cfattach.

ok miod@

dev/rndvar.h no longer has statistical interfaces (removed during various
conversion steps). it only contains kernel prototypes for 4 interfaces,
all of which legitimately belong in sys/systm.h, which are already included
by all enqueue_randomness() users.

Initialize ci_randseed better using arc4random() + a trick. Remove the
libkern srandom() API since it is not suitable for this use.
ok kettenis miod

1 << 31 cleanup. Eitan Adler pointed out that there has been a
resurrection of the bad idiom in the tree.
sufficient review by miod, kettenis, tedu

Make need_resched() call cpu_unidle() such that we wake up a process running on
another CPU.

ok miod@

Implement cpu_unidle() for MP kernels.

ok kettenis@

Allow processes to be scheduled onto secondary CPUs.

ok kettenis@

Rename ci_spinup_stack to ci_stack and use it as the stack for both CPU
spin up and FPU emulation. Since all CPUs need a stack for FPU emulation,
move the allocation code to cpuattach().

ok kettenis@

Add support for IPIs on hppa.

ok kettenis@

Spin up secondary CPUs on hppa multiprocessor kernels. At this stage we
enable clock interrupts, however do not allow processes to be scheduled
onto the secondary CPUs - hopefully we can change this shortly...

ok kettenis@

Ansify functions and use "clock" rather than the CPU name for clock
interrupts.

ok kettenis@

Allow for multiple CPUs by moving to an array of cpu_info.

ok kettenis@

Allow a multiprocessor kernel to compile.

ok kettenis@

Move hppa to a "cpu0 at mainbus0" configuration, rather than knocking CPUs
out in the cpu match function. Whilst here also hardwire the clock to IRQ
31, thus preventing one from building a kernel without hardclock.

ok kettenis@ miod@

Make sure than cpu_hardclock() never sets a ``next interrupt value'' which has
already been hit by the running timer; this happens very often on oosiop-based
machines, due to these machines being among the slowest hppa, and oosiop
being interrupt greedy. Unfortunately, when this happened, one had to wait
for the timer to wrap, which would take up to 128 seconds on the 33MHz
machines.

Also, invoke hardclock() as many times as necessary if it turns out that
we had to delay the interrupt 1/hz seconds to avoid the aforementioned
wrap problem.

With help from kettenis@; ok kettenis@

fix new line in dmesg print on 8k cpus

simplify cache print a bit

store fpu version for later use. make sure to proper store/clear fpu state in fork/exec/exit/sendsig

do not print anything about btlb if there is none

update copyright; miod@ is fine w/ files where he holds it too

rework cpu identification

make all intr_establish take the same last arg for name

fix fpu printout and remove dead code piece

duh, provide a wrapper on the hardclock() since it's void

no wrapper arounf hardclock(), use CPU_CLOCKUPDATE, real microtime; miod ok

fetch fpu id per the book (even it works otherwise), also, hppa_mod_info() always returns some string; idea by fredette@

print parisc level w/ the the parisc version, not for each cpu

need to mask out the upper part for the fpu version on print

better cache mode print

no need for reg.h in the frame.h

First round of __P removal in sys

no need to mask

expand fpu name, makes line overflow a bit, maybe deal w/ it later

rearrange stuff, chat about cache

disable fpu on csw, print fpu version on cpu line, if present

branches: 1.8.8;
print cpu revision and type

add luseless comment

branches: 1.6.2;
shorter text, so it fits in 80 columns

evcnt count the interrupts, also optimize diagnostic printing

next try to print cpu model number.
attach clock interrupt.

print cpu ID (type) if available

better cpu capabilities printing.
print cpu PA level
move cpu_gethpa() to mainbus.c

some cpu

hppa: switch to clockintr

- Remove hppa-specific clock interrupt scheduling bits from cpu_info.
- Rename cpu_hardclock() to itmr_intr(); it doesn't exclusively run
hardclock(9) anymore.
- Wire up itmr_intrclock.

hppa now has a randomized statclock(), stathz = hz.

Patch help, testing, and review from kettenis@ (B2000) and miod@ (C3650).
MP testing from guenther@ (dual-core J6700).

ok mlarkin@ kettenis@, "Ship it?" guenther@

Constify struct cfattach.

ok miod@

dev/rndvar.h no longer has statistical interfaces (removed during various
conversion steps). it only contains kernel prototypes for 4 interfaces,
all of which legitimately belong in sys/systm.h, which are already included
by all enqueue_randomness() users.

Initialize ci_randseed better using arc4random() + a trick. Remove the
libkern srandom() API since it is not suitable for this use.
ok kettenis miod

1 << 31 cleanup. Eitan Adler pointed out that there has been a
resurrection of the bad idiom in the tree.
sufficient review by miod, kettenis, tedu

Make need_resched() call cpu_unidle() such that we wake up a process running on
another CPU.

ok miod@

Implement cpu_unidle() for MP kernels.

ok kettenis@

Allow processes to be scheduled onto secondary CPUs.

ok kettenis@

Rename ci_spinup_stack to ci_stack and use it as the stack for both CPU
spin up and FPU emulation. Since all CPUs need a stack for FPU emulation,
move the allocation code to cpuattach().

ok kettenis@

Add support for IPIs on hppa.

ok kettenis@

Spin up secondary CPUs on hppa multiprocessor kernels. At this stage we
enable clock interrupts, however do not allow processes to be scheduled
onto the secondary CPUs - hopefully we can change this shortly...

ok kettenis@

Ansify functions and use "clock" rather than the CPU name for clock
interrupts.

ok kettenis@

Allow for multiple CPUs by moving to an array of cpu_info.

ok kettenis@

Allow a multiprocessor kernel to compile.

ok kettenis@

Move hppa to a "cpu0 at mainbus0" configuration, rather than knocking CPUs
out in the cpu match function. Whilst here also hardwire the clock to IRQ
31, thus preventing one from building a kernel without hardclock.

ok kettenis@ miod@

Make sure than cpu_hardclock() never sets a ``next interrupt value'' which has
already been hit by the running timer; this happens very often on oosiop-based
machines, due to these machines being among the slowest hppa, and oosiop
being interrupt greedy. Unfortunately, when this happened, one had to wait
for the timer to wrap, which would take up to 128 seconds on the 33MHz
machines.

Also, invoke hardclock() as many times as necessary if it turns out that
we had to delay the interrupt 1/hz seconds to avoid the aforementioned
wrap problem.

With help from kettenis@; ok kettenis@

fix new line in dmesg print on 8k cpus

simplify cache print a bit

store fpu version for later use. make sure to proper store/clear fpu state in fork/exec/exit/sendsig

do not print anything about btlb if there is none

update copyright; miod@ is fine w/ files where he holds it too

rework cpu identification

make all intr_establish take the same last arg for name

fix fpu printout and remove dead code piece

duh, provide a wrapper on the hardclock() since it's void

no wrapper arounf hardclock(), use CPU_CLOCKUPDATE, real microtime; miod ok

fetch fpu id per the book (even it works otherwise), also, hppa_mod_info() always returns some string; idea by fredette@

print parisc level w/ the the parisc version, not for each cpu

need to mask out the upper part for the fpu version on print

better cache mode print

no need for reg.h in the frame.h

First round of __P removal in sys

no need to mask

expand fpu name, makes line overflow a bit, maybe deal w/ it later

rearrange stuff, chat about cache

disable fpu on csw, print fpu version on cpu line, if present

branches: 1.8.8;
print cpu revision and type

add luseless comment

branches: 1.6.2;
shorter text, so it fits in 80 columns

evcnt count the interrupts, also optimize diagnostic printing

next try to print cpu model number.
attach clock interrupt.

print cpu ID (type) if available

better cpu capabilities printing.
print cpu PA level
move cpu_gethpa() to mainbus.c

some cpu

Constify struct cfattach.

ok miod@

dev/rndvar.h no longer has statistical interfaces (removed during various
conversion steps). it only contains kernel prototypes for 4 interfaces,
all of which legitimately belong in sys/systm.h, which are already included
by all enqueue_randomness() users.

Initialize ci_randseed better using arc4random() + a trick. Remove the
libkern srandom() API since it is not suitable for this use.
ok kettenis miod

1 << 31 cleanup. Eitan Adler pointed out that there has been a
resurrection of the bad idiom in the tree.
sufficient review by miod, kettenis, tedu

Make need_resched() call cpu_unidle() such that we wake up a process running on
another CPU.

ok miod@

Implement cpu_unidle() for MP kernels.

ok kettenis@

Allow processes to be scheduled onto secondary CPUs.

ok kettenis@

Rename ci_spinup_stack to ci_stack and use it as the stack for both CPU
spin up and FPU emulation. Since all CPUs need a stack for FPU emulation,
move the allocation code to cpuattach().

ok kettenis@

Add support for IPIs on hppa.

ok kettenis@

Spin up secondary CPUs on hppa multiprocessor kernels. At this stage we
enable clock interrupts, however do not allow processes to be scheduled
onto the secondary CPUs - hopefully we can change this shortly...

ok kettenis@

Ansify functions and use "clock" rather than the CPU name for clock
interrupts.

ok kettenis@

Allow for multiple CPUs by moving to an array of cpu_info.

ok kettenis@

Allow a multiprocessor kernel to compile.

ok kettenis@

Move hppa to a "cpu0 at mainbus0" configuration, rather than knocking CPUs
out in the cpu match function. Whilst here also hardwire the clock to IRQ
31, thus preventing one from building a kernel without hardclock.

ok kettenis@ miod@

Make sure than cpu_hardclock() never sets a ``next interrupt value'' which has
already been hit by the running timer; this happens very often on oosiop-based
machines, due to these machines being among the slowest hppa, and oosiop
being interrupt greedy. Unfortunately, when this happened, one had to wait
for the timer to wrap, which would take up to 128 seconds on the 33MHz
machines.

Also, invoke hardclock() as many times as necessary if it turns out that
we had to delay the interrupt 1/hz seconds to avoid the aforementioned
wrap problem.

With help from kettenis@; ok kettenis@

fix new line in dmesg print on 8k cpus

simplify cache print a bit

store fpu version for later use. make sure to proper store/clear fpu state in fork/exec/exit/sendsig

do not print anything about btlb if there is none

update copyright; miod@ is fine w/ files where he holds it too

rework cpu identification

make all intr_establish take the same last arg for name

fix fpu printout and remove dead code piece

duh, provide a wrapper on the hardclock() since it's void

no wrapper arounf hardclock(), use CPU_CLOCKUPDATE, real microtime; miod ok

fetch fpu id per the book (even it works otherwise), also, hppa_mod_info() always returns some string; idea by fredette@

print parisc level w/ the the parisc version, not for each cpu

need to mask out the upper part for the fpu version on print

better cache mode print

no need for reg.h in the frame.h

First round of __P removal in sys

no need to mask

expand fpu name, makes line overflow a bit, maybe deal w/ it later

rearrange stuff, chat about cache

disable fpu on csw, print fpu version on cpu line, if present

branches: 1.8.8;
print cpu revision and type

add luseless comment

branches: 1.6.2;
shorter text, so it fits in 80 columns

evcnt count the interrupts, also optimize diagnostic printing

next try to print cpu model number.
attach clock interrupt.

print cpu ID (type) if available

better cpu capabilities printing.
print cpu PA level
move cpu_gethpa() to mainbus.c

some cpu

dev/rndvar.h no longer has statistical interfaces (removed during various
conversion steps). it only contains kernel prototypes for 4 interfaces,
all of which legitimately belong in sys/systm.h, which are already included
by all enqueue_randomness() users.

Initialize ci_randseed better using arc4random() + a trick. Remove the
libkern srandom() API since it is not suitable for this use.
ok kettenis miod

1 << 31 cleanup. Eitan Adler pointed out that there has been a
resurrection of the bad idiom in the tree.
sufficient review by miod, kettenis, tedu

Make need_resched() call cpu_unidle() such that we wake up a process running on
another CPU.

ok miod@

Implement cpu_unidle() for MP kernels.

ok kettenis@

Allow processes to be scheduled onto secondary CPUs.

ok kettenis@

Rename ci_spinup_stack to ci_stack and use it as the stack for both CPU
spin up and FPU emulation. Since all CPUs need a stack for FPU emulation,
move the allocation code to cpuattach().

ok kettenis@

Add support for IPIs on hppa.

ok kettenis@

Spin up secondary CPUs on hppa multiprocessor kernels. At this stage we
enable clock interrupts, however do not allow processes to be scheduled
onto the secondary CPUs - hopefully we can change this shortly...

ok kettenis@

Ansify functions and use "clock" rather than the CPU name for clock
interrupts.

ok kettenis@

Allow for multiple CPUs by moving to an array of cpu_info.

ok kettenis@

Allow a multiprocessor kernel to compile.

ok kettenis@

Move hppa to a "cpu0 at mainbus0" configuration, rather than knocking CPUs
out in the cpu match function. Whilst here also hardwire the clock to IRQ
31, thus preventing one from building a kernel without hardclock.

ok kettenis@ miod@

Make sure than cpu_hardclock() never sets a ``next interrupt value'' which has
already been hit by the running timer; this happens very often on oosiop-based
machines, due to these machines being among the slowest hppa, and oosiop
being interrupt greedy. Unfortunately, when this happened, one had to wait
for the timer to wrap, which would take up to 128 seconds on the 33MHz
machines.

Also, invoke hardclock() as many times as necessary if it turns out that
we had to delay the interrupt 1/hz seconds to avoid the aforementioned
wrap problem.

With help from kettenis@; ok kettenis@

fix new line in dmesg print on 8k cpus

simplify cache print a bit

store fpu version for later use. make sure to proper store/clear fpu state in fork/exec/exit/sendsig

do not print anything about btlb if there is none

update copyright; miod@ is fine w/ files where he holds it too

rework cpu identification

make all intr_establish take the same last arg for name

fix fpu printout and remove dead code piece

duh, provide a wrapper on the hardclock() since it's void

no wrapper arounf hardclock(), use CPU_CLOCKUPDATE, real microtime; miod ok

fetch fpu id per the book (even it works otherwise), also, hppa_mod_info() always returns some string; idea by fredette@

print parisc level w/ the the parisc version, not for each cpu

need to mask out the upper part for the fpu version on print

better cache mode print

no need for reg.h in the frame.h

First round of __P removal in sys

no need to mask

expand fpu name, makes line overflow a bit, maybe deal w/ it later

rearrange stuff, chat about cache

disable fpu on csw, print fpu version on cpu line, if present

branches: 1.8.8;
print cpu revision and type

add luseless comment

branches: 1.6.2;
shorter text, so it fits in 80 columns

evcnt count the interrupts, also optimize diagnostic printing

next try to print cpu model number.
attach clock interrupt.

print cpu ID (type) if available

better cpu capabilities printing.
print cpu PA level
move cpu_gethpa() to mainbus.c

some cpu

Initialize ci_randseed better using arc4random() + a trick. Remove the
libkern srandom() API since it is not suitable for this use.
ok kettenis miod

1 << 31 cleanup. Eitan Adler pointed out that there has been a
resurrection of the bad idiom in the tree.
sufficient review by miod, kettenis, tedu

Make need_resched() call cpu_unidle() such that we wake up a process running on
another CPU.

ok miod@

Implement cpu_unidle() for MP kernels.

ok kettenis@

Allow processes to be scheduled onto secondary CPUs.

ok kettenis@

Rename ci_spinup_stack to ci_stack and use it as the stack for both CPU
spin up and FPU emulation. Since all CPUs need a stack for FPU emulation,
move the allocation code to cpuattach().

ok kettenis@

Add support for IPIs on hppa.

ok kettenis@

Spin up secondary CPUs on hppa multiprocessor kernels. At this stage we
enable clock interrupts, however do not allow processes to be scheduled
onto the secondary CPUs - hopefully we can change this shortly...

ok kettenis@

Ansify functions and use "clock" rather than the CPU name for clock
interrupts.

ok kettenis@

Allow for multiple CPUs by moving to an array of cpu_info.

ok kettenis@

Allow a multiprocessor kernel to compile.

ok kettenis@

Move hppa to a "cpu0 at mainbus0" configuration, rather than knocking CPUs
out in the cpu match function. Whilst here also hardwire the clock to IRQ
31, thus preventing one from building a kernel without hardclock.

ok kettenis@ miod@

Make sure than cpu_hardclock() never sets a ``next interrupt value'' which has
already been hit by the running timer; this happens very often on oosiop-based
machines, due to these machines being among the slowest hppa, and oosiop
being interrupt greedy. Unfortunately, when this happened, one had to wait
for the timer to wrap, which would take up to 128 seconds on the 33MHz
machines.

Also, invoke hardclock() as many times as necessary if it turns out that
we had to delay the interrupt 1/hz seconds to avoid the aforementioned
wrap problem.

With help from kettenis@; ok kettenis@

fix new line in dmesg print on 8k cpus

simplify cache print a bit

store fpu version for later use. make sure to proper store/clear fpu state in fork/exec/exit/sendsig

do not print anything about btlb if there is none

update copyright; miod@ is fine w/ files where he holds it too

rework cpu identification

make all intr_establish take the same last arg for name

fix fpu printout and remove dead code piece

duh, provide a wrapper on the hardclock() since it's void

no wrapper arounf hardclock(), use CPU_CLOCKUPDATE, real microtime; miod ok

fetch fpu id per the book (even it works otherwise), also, hppa_mod_info() always returns some string; idea by fredette@

print parisc level w/ the the parisc version, not for each cpu

need to mask out the upper part for the fpu version on print

better cache mode print

no need for reg.h in the frame.h

First round of __P removal in sys

no need to mask

expand fpu name, makes line overflow a bit, maybe deal w/ it later

rearrange stuff, chat about cache

disable fpu on csw, print fpu version on cpu line, if present

branches: 1.8.8;
print cpu revision and type

add luseless comment

branches: 1.6.2;
shorter text, so it fits in 80 columns

evcnt count the interrupts, also optimize diagnostic printing

next try to print cpu model number.
attach clock interrupt.

print cpu ID (type) if available

better cpu capabilities printing.
print cpu PA level
move cpu_gethpa() to mainbus.c

some cpu