_C_LABEL() and _ASM_LABEL() are no longer useful in the "everything
is ELF" world. Eliminate use of them in amd64, arm64, armv7, i386,
macppc, mips64, and sparc64 code.

ok deraadt@ jca@ krw@

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@

More steps for i386 Meltdown fix:

- provide struct cpu_info_full
- prepare K-U sections
- reorganize interrupt, trap, syscall entry to use K-U trampoline
- prepare pmap for entering special mappings, the mappings are not
setup yet

This code will already trigger performance issues. We do more tlb
flushes, but we do not unmap the kernel yet. The latter
will be needed to prevent Meltdown.

from hshoexer@; input guenther@; OK mlarkin@ deraadt@

Move grab/release of the kernel_lock for softintrs from the ASM stubs to
softintr_dispatch(). Delete traces of long superseded stats code.

ok beck@ mpi@ uebayasi@

Split AST handling from trap() into ast() and get rid of T_ASTFLT

testing by krw@, and then many via snapshots

Convert netisr to a normal soft interrupt instead of hanving MD code
for it. This makes the netisr a real C function which will help further
development. No noticable performance change on i386 and amd64.
With input from kettenis@ and miod@ additional OKs mikeb@ and henning@

Make i386 use a pointer to the trap frame like everybody else instead of
the weird "pass by reference" that causes problems with gcc4.

ok nicm@, tom@

Switch i386 from pccom to com. Welcomed by many.

ok dlg@, jsing@, deraadt@

Move i386 to __HAVE_GENERIC_SOFT_INTERRUPTS

ok dlg@, tested by dlg@, oga@, jsg@, deraadt@

Remove softast; it's no longer used.

ok krw@

Make ipending per-cpu. Should fix PR 5788.

ok weingart@

"interupt" -> "interrupt" in various comments. Mostly from Diego Casati.

Faster signal delivery on i386/MP.

We need to poke the other CPU so that it processes the AST immediately
and doesn't wait for the next interrupt or syscall.

Since IPIs really shouldn't process ASTs, we need to trigger a soft
interrupt on the destination CPU to process the AST. But since we can't
send soft interrupts to other CPUs, we send an IPI, that triggers a soft
interrupt that in turn processes the AST.

Also, this marks the beginning of moving to slightly better IPI mechanism
of short and optimized IPIs instead of the large and complicated IPI
infrastructure we're using now.

tested by many, ok tholo@

Prevent recursive interrupts. Solves kernel stack overflow on i386 under
heavy network interrupt load (I can reproduce with an ARP flood) with an MP
kernel. Patch from NetBSD PR20180.

Has been in snapshots for a bit. Testing by pedro@, jolan@. deraadt@ ok

Fix profiled kernel builds on i386 by moving splraise/splx code into macros
permitting non-recursive reuse in mcount.

Should be a no-op for normal builds.

debranch SMP, have fun

move netisr definition into md code to allow arch provide suitable allocation; tested on most archs

i386 changes to move to ELF. asm cleanup. Change MAXDSIZ to 512M for 1Gsep.
DARPA funded work.

branches: 1.18.2;
New try at a level based irq system.

Revert niklas's broken ICU interrupt handling changes; deraadt@ ok

Redo the ICU interrupt handling system to better emulate an APIC system.
This is done by representing the current blockings of interrupts with
a priority level instead of an interrupt mask. This makes it possible to
share implementations for spl* functions/macros between both ICU
and APIC (a must when going MP) systems. In this process, assign
soft interrupts their own levels to match the way things will be on
APIC systems where they actually will be real interrupts and not just
bits in a pending mask as they are now.
Heavily inspired by Bill Studenmunds SMP work in NetBSD

veli tpyo stolen fmor nkilsa

use _C_LABEL for c labels consistantly throghout the source

Use netisr_dispatch.h

branches: 1.12.2;
bring in KAME IPv6 code, dated 19991208.
replaces NRL IPv6 layer. reuses NRL pcb layer. no IPsec-on-v6 support.
see sys/netinet6/{TODO,IMPLEMENTATION} for more details.

GENERIC configuration should work fine as before. GENERIC.v6 works fine
as well, but you'll need KAME userland tools to play with IPv6 (will be
bringed into soon).

Only do basic work in the ethernet interrupt context, and queue packets to
be bridged. Do the real work in a scheduled netisr.

global decl for *intr() routines, plus add INET6

Add AppleTalk netisr. Only tested (indeed, only compiled) on mac68k port.
Add options NETATALK to your config to try it out.

someone send me an i386 assembler book

spin processing ast events before going back to userland; my fix

pccom and com are now mutually exclusive; pccom moves to major 8, the
same as com.

Also various function renaming and such so that multiport drivers should
now be able to link with pccom. pccomvar.h is no longer needed.

Integrate the i386 specific com driver from Onno van der Linden,
<onno@simplex.nl>, as a seperate driver. This is the OpenBSD com.c, with
his changes integrated and the functions renamed.

This driver should work with pcmcia, but hasn't been tested. It will not
work the multiport boards.

Simply switch 'com' to 'pccom' in your conf and change the major number of
your devices in order to use this.

add natm intr.

add IPX support.
from now IPX fully attached to the system, but only for i386.
other platforms need the same additions.

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

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@

More steps for i386 Meltdown fix:

- provide struct cpu_info_full
- prepare K-U sections
- reorganize interrupt, trap, syscall entry to use K-U trampoline
- prepare pmap for entering special mappings, the mappings are not
setup yet

This code will already trigger performance issues. We do more tlb
flushes, but we do not unmap the kernel yet. The latter
will be needed to prevent Meltdown.

from hshoexer@; input guenther@; OK mlarkin@ deraadt@

Move grab/release of the kernel_lock for softintrs from the ASM stubs to
softintr_dispatch(). Delete traces of long superseded stats code.

ok beck@ mpi@ uebayasi@

Split AST handling from trap() into ast() and get rid of T_ASTFLT

testing by krw@, and then many via snapshots

Convert netisr to a normal soft interrupt instead of hanving MD code
for it. This makes the netisr a real C function which will help further
development. No noticable performance change on i386 and amd64.
With input from kettenis@ and miod@ additional OKs mikeb@ and henning@

Make i386 use a pointer to the trap frame like everybody else instead of
the weird "pass by reference" that causes problems with gcc4.

ok nicm@, tom@

Switch i386 from pccom to com. Welcomed by many.

ok dlg@, jsing@, deraadt@

Move i386 to __HAVE_GENERIC_SOFT_INTERRUPTS

ok dlg@, tested by dlg@, oga@, jsg@, deraadt@

Remove softast; it's no longer used.

ok krw@

Make ipending per-cpu. Should fix PR 5788.

ok weingart@

"interupt" -> "interrupt" in various comments. Mostly from Diego Casati.

Faster signal delivery on i386/MP.

We need to poke the other CPU so that it processes the AST immediately
and doesn't wait for the next interrupt or syscall.

Since IPIs really shouldn't process ASTs, we need to trigger a soft
interrupt on the destination CPU to process the AST. But since we can't
send soft interrupts to other CPUs, we send an IPI, that triggers a soft
interrupt that in turn processes the AST.

Also, this marks the beginning of moving to slightly better IPI mechanism
of short and optimized IPIs instead of the large and complicated IPI
infrastructure we're using now.

tested by many, ok tholo@

Prevent recursive interrupts. Solves kernel stack overflow on i386 under
heavy network interrupt load (I can reproduce with an ARP flood) with an MP
kernel. Patch from NetBSD PR20180.

Has been in snapshots for a bit. Testing by pedro@, jolan@. deraadt@ ok

Fix profiled kernel builds on i386 by moving splraise/splx code into macros
permitting non-recursive reuse in mcount.

Should be a no-op for normal builds.

debranch SMP, have fun

move netisr definition into md code to allow arch provide suitable allocation; tested on most archs

i386 changes to move to ELF. asm cleanup. Change MAXDSIZ to 512M for 1Gsep.
DARPA funded work.

branches: 1.18.2;
New try at a level based irq system.

Revert niklas's broken ICU interrupt handling changes; deraadt@ ok

Redo the ICU interrupt handling system to better emulate an APIC system.
This is done by representing the current blockings of interrupts with
a priority level instead of an interrupt mask. This makes it possible to
share implementations for spl* functions/macros between both ICU
and APIC (a must when going MP) systems. In this process, assign
soft interrupts their own levels to match the way things will be on
APIC systems where they actually will be real interrupts and not just
bits in a pending mask as they are now.
Heavily inspired by Bill Studenmunds SMP work in NetBSD

veli tpyo stolen fmor nkilsa

use _C_LABEL for c labels consistantly throghout the source

Use netisr_dispatch.h

branches: 1.12.2;
bring in KAME IPv6 code, dated 19991208.
replaces NRL IPv6 layer. reuses NRL pcb layer. no IPsec-on-v6 support.
see sys/netinet6/{TODO,IMPLEMENTATION} for more details.

GENERIC configuration should work fine as before. GENERIC.v6 works fine
as well, but you'll need KAME userland tools to play with IPv6 (will be
bringed into soon).

Only do basic work in the ethernet interrupt context, and queue packets to
be bridged. Do the real work in a scheduled netisr.

global decl for *intr() routines, plus add INET6

Add AppleTalk netisr. Only tested (indeed, only compiled) on mac68k port.
Add options NETATALK to your config to try it out.

someone send me an i386 assembler book

spin processing ast events before going back to userland; my fix

pccom and com are now mutually exclusive; pccom moves to major 8, the
same as com.

Also various function renaming and such so that multiport drivers should
now be able to link with pccom. pccomvar.h is no longer needed.

Integrate the i386 specific com driver from Onno van der Linden,
<onno@simplex.nl>, as a seperate driver. This is the OpenBSD com.c, with
his changes integrated and the functions renamed.

This driver should work with pcmcia, but hasn't been tested. It will not
work the multiport boards.

Simply switch 'com' to 'pccom' in your conf and change the major number of
your devices in order to use this.

add natm intr.

add IPX support.
from now IPX fully attached to the system, but only for i386.
other platforms need the same additions.

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

More steps for i386 Meltdown fix:

- provide struct cpu_info_full
- prepare K-U sections
- reorganize interrupt, trap, syscall entry to use K-U trampoline
- prepare pmap for entering special mappings, the mappings are not
setup yet

This code will already trigger performance issues. We do more tlb
flushes, but we do not unmap the kernel yet. The latter
will be needed to prevent Meltdown.

from hshoexer@; input guenther@; OK mlarkin@ deraadt@

Move grab/release of the kernel_lock for softintrs from the ASM stubs to
softintr_dispatch(). Delete traces of long superseded stats code.

ok beck@ mpi@ uebayasi@

Split AST handling from trap() into ast() and get rid of T_ASTFLT

testing by krw@, and then many via snapshots

Convert netisr to a normal soft interrupt instead of hanving MD code
for it. This makes the netisr a real C function which will help further
development. No noticable performance change on i386 and amd64.
With input from kettenis@ and miod@ additional OKs mikeb@ and henning@

Make i386 use a pointer to the trap frame like everybody else instead of
the weird "pass by reference" that causes problems with gcc4.

ok nicm@, tom@

Switch i386 from pccom to com. Welcomed by many.

ok dlg@, jsing@, deraadt@

Move i386 to __HAVE_GENERIC_SOFT_INTERRUPTS

ok dlg@, tested by dlg@, oga@, jsg@, deraadt@

Remove softast; it's no longer used.

ok krw@

Make ipending per-cpu. Should fix PR 5788.

ok weingart@

"interupt" -> "interrupt" in various comments. Mostly from Diego Casati.

Faster signal delivery on i386/MP.

We need to poke the other CPU so that it processes the AST immediately
and doesn't wait for the next interrupt or syscall.

Since IPIs really shouldn't process ASTs, we need to trigger a soft
interrupt on the destination CPU to process the AST. But since we can't
send soft interrupts to other CPUs, we send an IPI, that triggers a soft
interrupt that in turn processes the AST.

Also, this marks the beginning of moving to slightly better IPI mechanism
of short and optimized IPIs instead of the large and complicated IPI
infrastructure we're using now.

tested by many, ok tholo@

Prevent recursive interrupts. Solves kernel stack overflow on i386 under
heavy network interrupt load (I can reproduce with an ARP flood) with an MP
kernel. Patch from NetBSD PR20180.

Has been in snapshots for a bit. Testing by pedro@, jolan@. deraadt@ ok

Fix profiled kernel builds on i386 by moving splraise/splx code into macros
permitting non-recursive reuse in mcount.

Should be a no-op for normal builds.

debranch SMP, have fun

move netisr definition into md code to allow arch provide suitable allocation; tested on most archs

i386 changes to move to ELF. asm cleanup. Change MAXDSIZ to 512M for 1Gsep.
DARPA funded work.

branches: 1.18.2;
New try at a level based irq system.

Revert niklas's broken ICU interrupt handling changes; deraadt@ ok

Redo the ICU interrupt handling system to better emulate an APIC system.
This is done by representing the current blockings of interrupts with
a priority level instead of an interrupt mask. This makes it possible to
share implementations for spl* functions/macros between both ICU
and APIC (a must when going MP) systems. In this process, assign
soft interrupts their own levels to match the way things will be on
APIC systems where they actually will be real interrupts and not just
bits in a pending mask as they are now.
Heavily inspired by Bill Studenmunds SMP work in NetBSD

veli tpyo stolen fmor nkilsa

use _C_LABEL for c labels consistantly throghout the source

Use netisr_dispatch.h

branches: 1.12.2;
bring in KAME IPv6 code, dated 19991208.
replaces NRL IPv6 layer. reuses NRL pcb layer. no IPsec-on-v6 support.
see sys/netinet6/{TODO,IMPLEMENTATION} for more details.

GENERIC configuration should work fine as before. GENERIC.v6 works fine
as well, but you'll need KAME userland tools to play with IPv6 (will be
bringed into soon).

Only do basic work in the ethernet interrupt context, and queue packets to
be bridged. Do the real work in a scheduled netisr.

global decl for *intr() routines, plus add INET6

Add AppleTalk netisr. Only tested (indeed, only compiled) on mac68k port.
Add options NETATALK to your config to try it out.

someone send me an i386 assembler book

spin processing ast events before going back to userland; my fix

pccom and com are now mutually exclusive; pccom moves to major 8, the
same as com.

Also various function renaming and such so that multiport drivers should
now be able to link with pccom. pccomvar.h is no longer needed.

Integrate the i386 specific com driver from Onno van der Linden,
<onno@simplex.nl>, as a seperate driver. This is the OpenBSD com.c, with
his changes integrated and the functions renamed.

This driver should work with pcmcia, but hasn't been tested. It will not
work the multiport boards.

Simply switch 'com' to 'pccom' in your conf and change the major number of
your devices in order to use this.

add natm intr.

add IPX support.
from now IPX fully attached to the system, but only for i386.
other platforms need the same additions.

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

Move grab/release of the kernel_lock for softintrs from the ASM stubs to
softintr_dispatch(). Delete traces of long superseded stats code.

ok beck@ mpi@ uebayasi@

Split AST handling from trap() into ast() and get rid of T_ASTFLT

testing by krw@, and then many via snapshots

Convert netisr to a normal soft interrupt instead of hanving MD code
for it. This makes the netisr a real C function which will help further
development. No noticable performance change on i386 and amd64.
With input from kettenis@ and miod@ additional OKs mikeb@ and henning@

Make i386 use a pointer to the trap frame like everybody else instead of
the weird "pass by reference" that causes problems with gcc4.

ok nicm@, tom@

Switch i386 from pccom to com. Welcomed by many.

ok dlg@, jsing@, deraadt@

Move i386 to __HAVE_GENERIC_SOFT_INTERRUPTS

ok dlg@, tested by dlg@, oga@, jsg@, deraadt@

Remove softast; it's no longer used.

ok krw@

Make ipending per-cpu. Should fix PR 5788.

ok weingart@

"interupt" -> "interrupt" in various comments. Mostly from Diego Casati.

Faster signal delivery on i386/MP.

We need to poke the other CPU so that it processes the AST immediately
and doesn't wait for the next interrupt or syscall.

Since IPIs really shouldn't process ASTs, we need to trigger a soft
interrupt on the destination CPU to process the AST. But since we can't
send soft interrupts to other CPUs, we send an IPI, that triggers a soft
interrupt that in turn processes the AST.

Also, this marks the beginning of moving to slightly better IPI mechanism
of short and optimized IPIs instead of the large and complicated IPI
infrastructure we're using now.

tested by many, ok tholo@

Prevent recursive interrupts. Solves kernel stack overflow on i386 under
heavy network interrupt load (I can reproduce with an ARP flood) with an MP
kernel. Patch from NetBSD PR20180.

Has been in snapshots for a bit. Testing by pedro@, jolan@. deraadt@ ok

Fix profiled kernel builds on i386 by moving splraise/splx code into macros
permitting non-recursive reuse in mcount.

Should be a no-op for normal builds.

debranch SMP, have fun

move netisr definition into md code to allow arch provide suitable allocation; tested on most archs

i386 changes to move to ELF. asm cleanup. Change MAXDSIZ to 512M for 1Gsep.
DARPA funded work.

branches: 1.18.2;
New try at a level based irq system.

Revert niklas's broken ICU interrupt handling changes; deraadt@ ok

Redo the ICU interrupt handling system to better emulate an APIC system.
This is done by representing the current blockings of interrupts with
a priority level instead of an interrupt mask. This makes it possible to
share implementations for spl* functions/macros between both ICU
and APIC (a must when going MP) systems. In this process, assign
soft interrupts their own levels to match the way things will be on
APIC systems where they actually will be real interrupts and not just
bits in a pending mask as they are now.
Heavily inspired by Bill Studenmunds SMP work in NetBSD

veli tpyo stolen fmor nkilsa

use _C_LABEL for c labels consistantly throghout the source

Use netisr_dispatch.h

branches: 1.12.2;
bring in KAME IPv6 code, dated 19991208.
replaces NRL IPv6 layer. reuses NRL pcb layer. no IPsec-on-v6 support.
see sys/netinet6/{TODO,IMPLEMENTATION} for more details.

GENERIC configuration should work fine as before. GENERIC.v6 works fine
as well, but you'll need KAME userland tools to play with IPv6 (will be
bringed into soon).

Only do basic work in the ethernet interrupt context, and queue packets to
be bridged. Do the real work in a scheduled netisr.

global decl for *intr() routines, plus add INET6

Add AppleTalk netisr. Only tested (indeed, only compiled) on mac68k port.
Add options NETATALK to your config to try it out.

someone send me an i386 assembler book

spin processing ast events before going back to userland; my fix

pccom and com are now mutually exclusive; pccom moves to major 8, the
same as com.

Also various function renaming and such so that multiport drivers should
now be able to link with pccom. pccomvar.h is no longer needed.

Integrate the i386 specific com driver from Onno van der Linden,
<onno@simplex.nl>, as a seperate driver. This is the OpenBSD com.c, with
his changes integrated and the functions renamed.

This driver should work with pcmcia, but hasn't been tested. It will not
work the multiport boards.

Simply switch 'com' to 'pccom' in your conf and change the major number of
your devices in order to use this.

add natm intr.

add IPX support.
from now IPX fully attached to the system, but only for i386.
other platforms need the same additions.

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