Delete the VM86 kernel option and i386_vm86(3) API: it's required
a custom kernel for over 20 years.

testing mlarkin@
ok deraadt@ phessler@ jca@ matthieu@

Implement a mechanism to establish interrupt handlers that don't grab the
kernel lock upon entry through a new IPL_MPSAFE flag/level.

Ateempt to make pci_intr_disestablish() work for MSIs.

ok deraadt@

More than a decade ago, interrupt handlers on sparc started returning 0
(interrupt was not for me), 1 (positive interrupt was for me), or -1
(i am not sure...). We have continued with this practice in as many
drivers as possible, throughout the tree.

This makes some of the architectures use that information in their
interrupt handler calling code -- if 1 is returned (and we know
this specific machine does not have edge-shared interrupts), we
finish servicing other possible handlers on the same pin. If the
interrupt pin remains asserted (from a different device), we will
end up back in the interrupt servicing code of course... but this is
cheaper than calling all the chained interrupts on a pin.

This does of course count on shared level interrupts being properly
sorted by IPL.

There have been some concerns about starvation of drivers which
incorrectly return 1. Those drivers should be hunted down so that
they return -1.

ok and help from various people. In snaps for about a week now.

Normalize sentinel. Use _MACHINE_*_H_ and _<ARCH>_*_H_ properly and consitently.

Discussed and okay drahn@. Okay deraadt@.

Use new event counter API for interrupt counting on i386. deraadt@ tholo@
drahn@ millert@ ok

PSL_XCRYPT is 0x40000000

Enable FXSR all the time, and cope with NPX/FXSR conversions; from netbsd.
Pass SSE/SSE2/XCRYPT flags out via syctl, and prepare for being able to do
xcrypt-* in userland; ok naddy, tested a lot by pvalchev and jolan, also
works on amd64 in 32bit mode

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

First round of __P removal in sys

branches: 1.11.8;
$OpenBSD$

branches: 1.10.14;
do not let PSL_NT be set in VM86 mode; netbsd

struct intrhand protected by _KERNEL; some user-mode assembly code
can't deal with the file without this

Move struct intrhand to <machine/psl.h> [again] so user-level programs can
get at it.

sync

sync with 0504; prototype changes

Merging w/ NetBSD 021796.
speaker upgraded to the current.
some changes to the VM stuff (ie kern_thread.c added and so).

Pass device name to interrupt establish routines so it can be recorded in
the device interrupt chain structures (isa, pci)

Move interrupt chain structure definition to <machine/psl.h> so vmstat can
get at it (i386)

Remove hack to count interrupts the old way (i386)

from netbsd; Hand-code softintr()

from netbsd:
Deal with GCC's dead code elimination being suboptimal.
Modify splraise() to allow better optimization.
Make cpl, ipending, and astpending volatile.
Make sure interrupts are disabled before jumping to a resume point,
to prevent races.
Make FPU faults use INTRFASTEXIT, and remove INTREXIT.
Build the frame for recursive interrupts manually, and make sure to
disable interrupts to avoid races.
VS: ----------------------------------------------------------------------

branches: 1.1.1;
Initial revision

Implement a mechanism to establish interrupt handlers that don't grab the
kernel lock upon entry through a new IPL_MPSAFE flag/level.

Ateempt to make pci_intr_disestablish() work for MSIs.

ok deraadt@

More than a decade ago, interrupt handlers on sparc started returning 0
(interrupt was not for me), 1 (positive interrupt was for me), or -1
(i am not sure...). We have continued with this practice in as many
drivers as possible, throughout the tree.

This makes some of the architectures use that information in their
interrupt handler calling code -- if 1 is returned (and we know
this specific machine does not have edge-shared interrupts), we
finish servicing other possible handlers on the same pin. If the
interrupt pin remains asserted (from a different device), we will
end up back in the interrupt servicing code of course... but this is
cheaper than calling all the chained interrupts on a pin.

This does of course count on shared level interrupts being properly
sorted by IPL.

There have been some concerns about starvation of drivers which
incorrectly return 1. Those drivers should be hunted down so that
they return -1.

ok and help from various people. In snaps for about a week now.

Normalize sentinel. Use _MACHINE_*_H_ and _<ARCH>_*_H_ properly and consitently.

Discussed and okay drahn@. Okay deraadt@.

Use new event counter API for interrupt counting on i386. deraadt@ tholo@
drahn@ millert@ ok

PSL_XCRYPT is 0x40000000

Enable FXSR all the time, and cope with NPX/FXSR conversions; from netbsd.
Pass SSE/SSE2/XCRYPT flags out via syctl, and prepare for being able to do
xcrypt-* in userland; ok naddy, tested a lot by pvalchev and jolan, also
works on amd64 in 32bit mode

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

First round of __P removal in sys

branches: 1.11.8;
$OpenBSD$

branches: 1.10.14;
do not let PSL_NT be set in VM86 mode; netbsd

struct intrhand protected by _KERNEL; some user-mode assembly code
can't deal with the file without this

Move struct intrhand to <machine/psl.h> [again] so user-level programs can
get at it.

sync

sync with 0504; prototype changes

Merging w/ NetBSD 021796.
speaker upgraded to the current.
some changes to the VM stuff (ie kern_thread.c added and so).

Pass device name to interrupt establish routines so it can be recorded in
the device interrupt chain structures (isa, pci)

Move interrupt chain structure definition to <machine/psl.h> so vmstat can
get at it (i386)

Remove hack to count interrupts the old way (i386)

from netbsd; Hand-code softintr()

from netbsd:
Deal with GCC's dead code elimination being suboptimal.
Modify splraise() to allow better optimization.
Make cpl, ipending, and astpending volatile.
Make sure interrupts are disabled before jumping to a resume point,
to prevent races.
Make FPU faults use INTRFASTEXIT, and remove INTREXIT.
Build the frame for recursive interrupts manually, and make sure to
disable interrupts to avoid races.
VS: ----------------------------------------------------------------------

branches: 1.1.1;
Initial revision