Implement _UC_SETSTACK / _UC_CLRSTACK.

Move the at-shutdown call to resettodr() from cpu_reboot() to kern_reboot().

It's a small step, but it's a step.

vax: set default RLIMIT_AS to the same as MAXDSIZ

this allows modern GCC to run without returning to the issues that
reported in PR#28379, and avoids a strange sort-of-invariant violation
where the rlimit for data equaled the rlimit for all address space, so
there is no room for text or stack etc.

ok ragge@

XXX: pullup-10

Include leds.h to make /dev/leds work.

branches: 1.196.20;
uvm_availmem(): give it a boolean argument to specify whether a recent
cached value will do, or if the very latest total must be fetched. It can
be called thousands of times a second and fetching the totals impacts not
only the calling LWP but other CPUs doing unrelated activity in the VM
system.

Rename uvm_free() -> uvm_availmem().

uvmexp.free -> uvm_free()

Retire compat_ibcs2, as discussed on tech-kern@. FreeBSD did the same
recently.

branches: 1.192.2;
Set max/dfl size for vm a process may have to the same as for data.
This avoids a problem where mmap may lock processes in the system,
and solves PR port-vax/28379.

branches: 1.191.2; 1.191.8; 1.191.16;
Fix leds.h include.

branches: 1.190.6;
use cpu_{g,s}etmodel

branches: 1.189.2; 1.189.4;
Kernel crash dumps are not properly implemented - so do not pretend they
would exist and set dumplo to 0 if dumpsize is 0. This makes savecore
happy.
XXX - implement real dumps, most of the needed code seems to be in place
already.

Calling _lwp_create() with a bogus ucontext could trigger a kernel
assertion failure (and thus a crash in DIAGNOSTIC kernels). Independently
discovered by YAMAMOTO Takashi and Joel Sing.

To avoid this, introduce a cpu_mcontext_validate() function and move all
sanity checks from cpu_setmcontext() there. Also untangle the netbsd32
compat mess slightly and add a cpu_mcontext32_validate() cousin there.

Add an exhaustive atf test case, based partly on code from Joel Sing.

Should finally fix the remaining open part of PR kern/43903.

physmem is declared by uvm

Remove COMPAT_SA / KERN_SA. Welcome to 6.99.3!
Approved by core@.

branches: 1.185.2;
converting extent(9) from malloc(9) to kmem(9)
preceding kmem-vmem-pool-uvm patch

releng@ acknowledged

define _UC_TLSBASE and use it to pass the TLS pointer to setcontext().
since there is no available space in ucontext_t on vax, pass the
TLS pointer on the stack referenced by the ucontext_t instead.
suggested by joerg.

implement bdev_size(9) wrapper around d_psize() routine, so we can take
the device lock in relevant places. avoid doing so while actually dumping.

tested i386 crash dumps still work, and that all touched files compile.

fixes PR#45705.

branches: 1.182.2; 1.182.6;
Cleanup trapframe handling. Instead of keeping a trapframe pointer in the
pcb, put in the mdlwp instead. We had a dummy field so it didn't grow in
size. This also follows the practice that mips and powerpc follow that a
pointer to the user trapframe is in l->l_md.md_utf. Make trapframe members
start with tf_

Welcome to 5.99.53! Merge rmind-uvmplock branch:

- Reorganize locking in UVM and provide extra serialisation for pmap(9).
New lock order: [vmpage-owner-lock] -> pmap-lock.

- Simplify locking in some pmap(9) modules by removing P->V locking.

- Use lock object on vmobjlock (and thus vnode_t::v_interlock) to share
the locks amongst UVM objects where necessary (tmpfs, layerfs, unionfs).

- Rewrite and optimise x86 TLB shootdown code, make it simpler and cleaner.
Add TLBSTATS option for x86 to collect statistics about TLB shootdowns.

- Unify /dev/mem et al in MI code and provide required locking (removes
kernel-lock on some ports). Also, avoid cache-aliasing issues.

Thanks to Andrew Doran and Joerg Sonnenberger, as their initial patches
formed the core changes of this branch.

branches: 1.180.6;
Cleanups includes. Change <machine/XXX.h> to <sys/XXX.h>
Remove unneeded includes.

branches: 1.179.2;
Remove separate mb_map. The nmbclusters is computed at boot time based
on the amount of physical memory and limited by NMBCLUSTERS if present.
Architectures without direct mapping also limit it based on the kmem_map
size, which is used as backing store. On i386 and ARM, the maximum KVA
used for mbuf clusters is limited to 64MB by default.

The old default limits and limits based on GATEWAY have been removed.
key_registered_sb_max is hard-wired to a value derived from 2048
clusters.

branches: 1.178.2;
- Use lwp_getpcb() on VAX, clean from struct user usage.
- Include sys/user.h in MD proc.h .

kill extra whitespaces
reviewed by tsutsui@

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>.

bcopy -> memcpy

Use "defopt MODULAR" in sys/conf/files, and #include "opt_modular.h"
in all kernel sources that use the MODULAR option.
Proposed in tech-kern on 18 Jan 2009.

branches: 1.173.2;
Re-adapt to the changed return types for major() and minor().

fix dev_t printf formats.

As discussed on tech-kern: mutex_init is too heavyweight for early bootstrap
phases, so move the initialization of the ksyms mutex back into main via
a function called ksyms_init. Rename the existing (but quite different)
ksyms_init* variations into ksyms_addsyms_elf() and ksyms_addsyms_explicit()
and adapt machdep code accordingly.

fix build for kernel configs lacking KA46, KA48, KA49 and KA53 support.
OK by mhitch.

Remove LKMs and switch to the module framework, pass 1.

Proposed on tech-kern@.

It is not appropriate to call pmf_system_shutdown(9) from
doshutdownhooks(9): shutdown hooks registered by shutdownhook_establish(9)
expect to be called with interrupts disabled, but shutdown hooks
registered with pmf_device_register1(9) expect to be called with
interrupts enabled. So I have made two changes:

1 Do not call pmf_system_shutdown() from doshutdownhooks(). Instead,
change every call to doshutdownhooks() to a call to doshutdownhooks()
followed by a call to pmf_system_shutdown(). No functional change
is intended by this change.

2 Make i386 re-enable interrupts briefly while it calls
pmf_system_shutdown(). I leave it to others either to fix the
other ports, or to factor out some MI shutdown code, as joerg@
suggests, and fix that. Note that a functional change *is* intended
by this change.

I hope that this patch will stop us from flip-flopping between
calling doshutdownhooks() and pmf_system_shutdown() sometimes with
and sometimes without interrupts enabled.

branches: 1.167.2; 1.167.4;
build fix: get prototype for cpu_upcall()

Merge wrstuden-revivesa into HEAD.

branches: 1.165.2;
Replce exec_map with a pool. Proposed on tech-kern@, reviewed by chs@.

branches: 1.164.4; 1.164.6; 1.164.8;
Rototill the vax code. Switch to devicet/PRIV_ALLOC. Cleanup vax autoconf
code. Move to prototype definitions. staticfy, constify, avoid casting.
Use device_* accessors.

A number of performance changes:
Change internal register SSP to contain curlwp insread curcpu(). This
shrinks the GENERIC by 2KB.
Add rwlock stubs (rw_enter, rw_exit, rw_tryenter).
Simplify simple lock code for uniprocessors.
Do SPL raise/lower in cpu_handle_ipi instead of simple_locks.

branches: 1.162.2; 1.162.6;
More softint fixes. We need to restore the softint lwp's pcb to it's initial
state since it may have been blocked or interrupted by another softint.

Make NetBSD/vax work again. Add support for __HAVE_FAST_SOFTINTS.
Add a few small optimizations.

Make process_sstep use ANSI declaration.

Interrupt handling changes, in discussion since February:

- Reduce available SPL levels for hardware devices to none, vm, sched, high.
- Acquire kernel_lock only for interrupts at IPL_VM.
- Implement threaded soft interrupts.

branches: 1.158.2; 1.158.18; 1.158.20; 1.158.26;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

TRUE -> true, FALSE -> false

Change the process/lwp flags seen by userland via sysctl back to the
P_*/L_* naming convention, and rename the in-kernel flags to avoid
conflict. (P_ -> PK_, L_ -> LW_ ). Add back the (now unused) LSDEAD
constant.

Restores source compatibility with pre-newlock2 tools like ps or top.

Reviewed by Andrew Doran.

branches: 1.155.2;
Partially adapt the VAX port to the newlock2 changes. These are untested
but they do at least compile.

Merge newlock2 to head.

Propagate const, prompted by new gcc.

branches: 1.152.20; 1.152.22;
bare asm -> __asm

merge ktrace-lwp.

branches: 1.150.2;
Declare the second arg of process_write_{fp,}regs() to be const.
This permits sh5 to continue to re-use those functions in cpu_setmcontext()
with the recent change to Makefile.kern.inc (revision 1.62).

Move the MI printing of `copyright' to the MD cpu_startup() code
where the printing of `version' is already performed.
This has the benefit of allowing the copyright to be available
via dmesg(8) on platforms which need the `msgbuf' to be setup
in cpu_startup() before printed output is remembered.

Rework cpu_upcall. Actually build a stack frame and argument list and
don't use a trampoline.

merge yamt-km branch.
- don't use managed mappings/backing objects for wired memory allocations.
save some resources like pv_entry. also fix (most of) PR/27030.
- simplify kernel memory management API.
- simplify pmap bootstrap of some ports.
- some related cleanups.

branches: 1.146.4; 1.146.6;
The second "console_device" node should really be called "booted_device".

branches: 1.145.2;
Tango on sysctl_createv() and flags. The flags have all been renamed,
and sysctl_createv() now uses more arguments.

Replace the traditional buffer memory management -- based on fixed per buffer
virtual memory reservation and a private pool of memory pages -- by a scheme
based on memory pools.

This allows better utilization of memory because buffers can now be allocated
with a granularity finer than the system's native page size (useful for
filesystems with e.g. 1k or 2k fragment sizes). It also avoids fragmentation
of virtual to physical memory mappings (due to the former fixed virtual
address reservation) resulting in better utilization of MMU resources on some
platforms. Finally, the scheme is more flexible by allowing run-time decisions
on the amount of memory to be used for buffers.

On the other hand, the effectiveness of the LRU queue for buffer recycling
may be somewhat reduced compared to the traditional method since, due to the
nature of the pool based memory allocation, the actual least recently used
buffer may release its memory to a pool different from the one needed by a
newly allocated buffer. However, this effect will kick in only if the
system is under memory pressure.

Strings (even ifdef'ed out) can't run past the end of the line. Use
ANSI string concatenation.

Dynamic sysctl.

Gone are the old kern_sysctl(), cpu_sysctl(), hw_sysctl(),
vfs_sysctl(), etc, routines, along with sysctl_int() et al. Now all
nodes are registered with the tree, and nodes can be added (or
removed) easily, and I/O to and from the tree is handled generically.

Since the nodes are registered with the tree, the mapping from name to
number (and back again) can now be discovered, instead of having to be
hard coded. Adding new nodes to the tree is likewise much simpler --
the new infrastructure handles almost all the work for simple types,
and just about anything else can be done with a small helper function.

All existing nodes are where they were before (numerically speaking),
so all existing consumers of sysctl information should notice no
difference.

PS - I'm sorry, but there's a distinct lack of documentation at the
moment. I'm working on sysctl(3/8/9) right now, and I promise to
watch out for buses.

Fix GCC3'ism's

Add SA_SIGINFO support for VAX.

Fix "constify sendsig/trapsignal" fallout for non-siginfo'd archs. Test
compiled on most architectures.

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

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

__KERNEL_RCSID()

branches: 1.136.2;
Make sure to include opt_foo.h if a defflag option FOO is used.

Call ksyms_init() instead of ddb_init() in case of
NKSYMS || defined(DDB) || defined(LKM)

Use PAGE_SIZE rather than NBPG.

Add machdep sysctl support. Support booted_device, consdev, and
printfataltraps.

Merge the nathanw_sa branch.

Fix inconsistencies in various definitions of avail_*, virtual_*, and
proc0paddr.

Fix for a problem where an user can crash the machine via sigreturn(),
noticed by and fix from Miod Vallat <miod@openbsd.org>.

Miod's OpenBSD log message:
> Don't uvm_useracc the user sigcontext in sys_sigreturn and then access
> the user addresses directly from the kernel. copyin is faster and can
> correctly deal properly with mappings that uvm_useracc thinks are
> correct but will fault anyway (to figure out how to generate such
> mappings is left as en excercise for the reader).
>
> Blatantly stolen from art@'s similar fix to sparc.

Add common routines to talk with the CPMBX, from Hugh Graham (hugh@openbsd.org)
This makes halt/reboot work correctly on a bunch of machines.

Don't use rmaps; use extent maps instead.

Fix a signal handler bug originally reported by Hugh Graham some year ago:
If two signals are sent after each other without the process being run in
userspace between them then the second one will overwrite part of the signal
info stored on the userstack.
Fixed by rewriting and simplifying both the signal delivery code and the
trampoline code. Also bump signal version number to 2.

Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant structure in device drivers.

- The new grammer ``device-major'' is introduced to ``files''.

device-major <prefix> char <num> [block <num>] [<rules>]

- All device major numbers must be listed up in port dependent majors.<arch>
by using this grammer.

- Added the new naming convention.
The name of the device switch must be <prefix>_[bc]devsw for auto-generation
of device switch tables.

- The backward compatibility of loading block/character device
switch by LKM framework is broken. This is necessary to convert
from block/character device major to device name in runtime and vice versa.

- The restriction to assign device major by LKM is completely removed.
We don't need to reserve LKM entries for dynamic loading of device switch.

- In compile time, device major numbers list is packed into the kernel and
the LKM framework will refer it to assign device major number dynamically.

Make nbuf, nswbuf, and bufpages unsigned. Make all operations on these
variables unsigned, and update places where their values are printed.

Add kernel support for having userland provide the signal trampoline:

* struct sigacts gets a new sigact_sigdesc structure, which has the
sigaction and the trampoline/version. Version 0 means "legacy kernel
provided trampoline". Other versions are coordinated with machine-
dependent code in libc.
* sigaction1() grows two more arguments -- the trampoline pointer and
the trampoline version.
* A new __sigaction_sigtramp() system call is provided to register a
trampoline along with a signal handler.
* The handler is no longer passed to sensig() functions. Instead,
sendsig() looks up the handler by peeking in the sigacts for the
process getting the signal (since it has to look in there for the
trampoline anyway).
* Native sendsig() functions now select the appropriate trampoline and
its arguments based on the trampoline version in the sigacts.

Changes to libc to use the new facility will be checked in later. Kernel
version not bumped; we will ride the 1.6C bump made recently.

branches: 1.123.2;
Make ddb symbol loading work for ELF as well a.out.

Change type of dumpmag to u_int32_t since it is actually
a 32bit unsigned magic number.
As per discussion on tech-kern, and fixes port-sparc64/11949.

Move .s files to .S files. (and .s.o rules in boot/Makefile.inc)
Put in register prefixes everywhere.

branches: 1.120.4;
Update pmap_update to now take the updated pmap as an argument.
This will allow improvements to the pmaps so that they can more easily defer expensive operations, eg tlb/cache flush, til the last possible moment.

Currently this is a no-op on most platforms, so they should see no difference.

Reviewed by Jason.

branches: 1.119.2;
use pmap_k* for buffer cache pages.

branches: 1.118.2;
Do more intelligent calculation of KVM size. This reduces the amount of
pre-allocated physical memory significantly.
A 11/750, for example, get 2MB more free (of 14MB), about 12%.

replace vm_map{,_entry}_t with struct vm_map{,_entry} *.

Must lock kernel when softclock is called from outside hardclock.

Use the symtab info given by loadfile in the booter instead of assuming
we know where it is. This is a requirement for ELF.

Move RB_KDB check to after VM is init so that there's an
interrupt stack for DDB to run on. This makes boot -d work.

Sprinkle pmap_update() calls after calls to:
- pmap_enter()
- pmap_remove()
- pmap_protect()
- pmap_kenter_pa()
- pmap_kremove()
as described in pmap(9).

These calls are relatively conservative. It may be possible to
optimize these a little more.

eliminate the KERN_* error codes in favor of the traditional E* codes.
the mapping is:

KERN_SUCCESS 0
KERN_INVALID_ADDRESS EFAULT
KERN_PROTECTION_FAILURE EACCES
KERN_NO_SPACE ENOMEM
KERN_INVALID_ARGUMENT EINVAL
KERN_FAILURE various, mostly turn into KASSERTs
KERN_RESOURCE_SHORTAGE ENOMEM
KERN_NOT_RECEIVER <unused>
KERN_NO_ACCESS <unused>
KERN_PAGES_LOCKED <unused>

branches: 1.111.2;
Make softclock a generic soft interrupt of the API is available,
adding the requisite void * argument to softclock().

split off thread specific stuff from struct sigacts to struct sigctx, leaving
only signal handler array sharable between threads
move other random signal stuff from struct proc to struct sigctx

This addresses kern/10981 by Matthew Orgass.

add a clarifying comment.

Add an align argument to uvm_map() and some callers of that
routine. Works similarly fto pmap_prefer(), but allows callers
to specify a minimum power-of-two alignment of the region.
How we ever got along without this for so long is beyond me.

By some reason setstatclockrate() suddenly get called occationally
(it hasn't been called since -94 :-) Remove the panic that happens when
it is called.

Add bi interrupt allocator. Should be somewhere else.

Kwality control:
* put #includes of opt headers and headers to get protos used by
net/netisr_dispatch.h in net/netisr.h (if !defined(_LOCORE)) (rather than
in netisr_dispatch.h itself, and potentially nowhere, respectively).
* require netisr.h to be included before netisr_dispatch.h.
* minor additional cleanup of both netisr.h and netisr_dispatch.h.
* clean up uses to remove now-unnecessary header file inclusions, and
local prototypes of the fns.
* convert netisr dispatch implementations which didn't use
netisr_dispatch.h (pc532) to use it.

remove include of <vm/vm.h>. <vm/vm.h> -> <uvm/uvm_extern.h>

remove/move more mach vm header files:

<vm/pglist.h> -> <uvm/uvm_pglist.h>
<vm/vm_inherit.h> -> <uvm/uvm_inherit.h>
<vm/vm_kern.h> -> into <uvm/uvm_extern.h>
<vm/vm_object.h> -> nothing
<vm/vm_pager.h> -> into <uvm/uvm_pager.h>

also includes a bunch of <vm/vm_page.h> include removals (due to redudancy
with <vm/vm.h>), and a scattering of other similar headers.

Do not clear msgbufenabled in dumpsys(). Dump messages will now go to
the message buffer. This can be invaluable in debugging if the dump
fails (assuming a persistant message buffer)

Add IPL_* codes.
Add other codes for struct references.
Add softintr framework for IPL_SOFTNET and IPL_SOFTSERIAL.
General cleanup of .s files replacing hardcoded structure offsets with
symbolic ones.

Use the cpu_info struct to store cpu-specific data in the same way in
both uniprocessor and multiprocessor environments. Use the otherwise
unused internal CPU register SSP to store the cpu_info pointer.
The macros curcpu(), curproc, cpu_number() and need_resched() are now the
same in both uniprocessor and multiprocessor environments.

branches: 1.99.2;
First sweep at scheduler state cleanup. Collect MI scheduler
state into global and per-CPU scheduler state:

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

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

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

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

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

Call doshutdownhooks().

Centralise the declarations of cpu_model, machine, machine_arch,
osrelease, and ostype and remove "extern char foo[];" (for hostname
and domainname too).

Also delete redunctant decl of boottime in kern_info_43.c.

First cut of multiprocessor support for vax. Still much to do before
other CPUs than the master can spin up.

add real vmapbuf/vunmapbuf routines. needed for VS4000 SCSI support.

expunge vm_offset_t and vm_size_t.
add bus_dma support for the vs4000 dma translation map (sgmap).
enhance the vsbus for the lance to work with it.
remove the sgmap init code from ka46/48/49.c

Move callout initialization to a single location; no need to duplicate
that code all over the place.

Bogus context pointer sent to sigreturn() may crash the machine.
Bug found by der Mouse.

CL* discarding.
Move physmem setting to pmap_bootstrap().
Fix security problem in process_write_regs(), found by Klaus Klein.

Update for pmap_enter() API change. No functional difference.

Let smg be probed as all other possible consoles.

Remove the vmapbuf()/vunmapbuf() routines. They are quite unneccessary
on a machine that has MMU for its I/O devices.

branches: 1.87.2; 1.87.4; 1.87.6;
Centralize the declaration and clearing of `cold'.

PGOFSET should be VAX_PGOFSET.
Remove two unused prototypes.

Clean up all bus handling stuff, it has become a mess the latest years.
Add a new bus; "ibus" that is the internal MicroVAX bus.

Change the vm_map's "entries_pageable" member to a r/o flags member, which
has PAGEABLE and INTRSAFE flags. PAGEABLE now really means "pageable",
not "allocate vm_map_entry's from non-static pool", so update all map
creations to reflect that. INTRSAFE maps are maps that are used in
interrupt context (e.g. kmem_map, mb_map), and thus use the static
map entry pool (XXX as does kernel_map, for now). This will eventually
change now these maps are locked, as well.

* convert to using MI allocsys(). most ports were using an MD allocsys(),
although a couple still used the old pre-4.4-lite (?) mechanism.
* use format_bytes() to format the various printf()s that print out memory sizes

EEEK! The signal changes a while ago caused the user struct to be
on top of the "red zone" in the kernel stack. This phenomenon has
caused many unexplainable things to happen the last year.

Real-time clock is started on the same way on all CPUs, there is no
need for a special CPU-dependent hook for this.

g/c REAL_CLISTS.

Use "access_type" in pmap_enter() more intelligent.
Allocate device register space bigger than the logical page size
from the kernel map, thus decreasing the pre-allocated page table memory.

Use the pool allocator for mbufs instead of a separate submap.

add a `flags' argument to uvm_pagealloc_strat().
define a flag UVM_PGA_USERESERVE to allow non-kernel object
allocations to use pages from the reserve.
use the new flag for allocations in pmap modules.

branches: 1.76.2;
Don't call configure() from cpu_startup().

Changes for modified pmap_enter() API:
* Map the message buffer with access_type = VM_PROT_READ|VM_PROT_WRITE `just
because'.
* Map the file system buffers with access_type = VM_PROT_READ|VM_PROT_WRITE to
avoid possible problems with pagemove().
* Do not use VM_PROT_EXEC with either of the above.
* Map pages for /dev/mem with access_type = prot. Also, DO NOT use
pmap_kenter() for this, as we DO NOT want to lose modification information.
* Map pages in dumpsys() with VM_PROT_READ.
* Map pages in m68k mappedcopyin()/mappedcopyout() and writeback() with
access_type = prot.
* For now, bus_dma*(), pmap_map(), vmapbuf(), and similar functions still use
access_type = 0. This should probably be revisited.

completely remove Mach VM support. all that is left is the all the
header files as UVM still uses (most of) these.

Change vsbus to take a locator for all devices.
Figure out interrupt vector/mask on vsbus by forcing all devices to
generate interrupts in the match routine, like on unibus.

defopt BUFCACHE and BUFPAGES.

Another giant change: Allocate register space dynamic instead of compiled-in.
This is done on a physical page size basis, instead of virtual (as the
(on vax yet non-existing) bus_* routines does). This is similar to the
way uba allocation is done.

Allocate (almost) all interrupt vectors dynamically. Simplifies much
work when adding support for new machines and devices.

Garbage-collect `mbutl'.

Fix bufpages miscalculation. At the same time, make bufpages configurable
att compile time.

uvm_km_alloc -> uvm_km_zalloc.

EGCS fixes.

Defopt SYSVMSG, SYSVSEM and SYSVSHM.

Provide configure(), rather than open-coding it in cpu_startup().

Change backplace0 to mainbus0 (for consistency with other ports).
Remove unused function protocols from ka410.h and ka43.h
Fix some ka46 missing references

use old sigmask in sigcontext and old sigreturn syscall in Ultrix
emulation mode

Make kernel compile after recent signal changes.

defopt NS, NSIP.

defopt INET, NETATALK.

defopt DDB.

Fix after current DDB changes.

Wall fixes.

Rudimentary support for the VS3100 builtin graphics console.

Fix some arithmetics lossage on typeless pointers.

Support for UVM on VAXen.

Disable the message buffer during crash dumps by clearing msgbufenabled,
not msgbufmapped.

When dumping, print out the device number as major,minor.

Move some interrupt routines out to assembler.
Optimize (slightly) pmap_clear_modify.

Optimized copy/fetch/store routines; rewritten in assembler.

Fix clearing of redundant restart flag; CPU specific.
Also clean up a bit.

branches: 1.47.2;
#include <vm/vm.h>. Fix some erroneous declarations.

Implement the kernel part of pr-1891. This allows for a more flexible sized
msgbuf. Note that old 'dmesg' and 'syslogd' binaries will continue running,
though old 'dmesg' binaries will output a few bytes of junk at the start of
the buffer, and will miss a few bytes at the end of the buffer.

branches: 1.45.2; 1.45.4;
Actually do 'halt' or 'reboot' on MicroVAX.

bring mrg-vm-swap2 onto mainilne.

Initialize machine from MACHINE and machine_arch from MACHINE_ARCH.

Add 'char machine_arch[] = "xxx";' for the new sysctl hw.machine_arch.

branches: 1.41.2;
Fix so that these files compile again after recent ARP changes.

Add netatalk netisr

Don't allocate mclrefcnt[]; it's dead and gone.

Renames: /dumpconf/cpu_dumpconf/, /boot/cpu_reboot/

Clean up console autoconfiguration so that the VAXstation DZ11-like
console work.

Basic change to cpu-config code. This will make support of new
cpu types much easier.

branches: 1.35.4; 1.35.6;
Prototype updates.

backout previous kprintf change

printf -> kprintf, sprintf -> ksprintf

Change reboot(2) to take two arguments: bootopt like normal and also
a boot string for firmware that can do this, such as the SPARC and
the sun3 models. It is currently silently ignored on all other
hardware now, however. The MD function "boot()" has been changed to
also take a char *.

Reflect the changes of CPU determination. Add support for VAXstations.

Fixed all (proto)type errors. Fixes PR 2377.

Added prototypes to everything. Made all files compile with -Wall.

Support for VAX 8600/8650 added. Works with lots of Unibus adapters,
and will probably work with Massbus adapters as well. (Not tested,
but it's the same code as for 11/780). Ubareset's may cause crashes
on 8600 also like 11/780, but they are more uncommon. No support
for console RL02 yet, but it's likely to come.

Fix fuswintr/suswintr arguments to match prototype.

Support for VAX 11/780 - 11/785 system types added.
There are no support (yet) for the RX01 console floppy,
even if it is actually needed to create boot floppies.
(The arff utility is also missing, so...)

Fix cpu_sysctl() arguments to be like prototype.

Fix #includes.

Save USP when trapping from userspace.
Change register save structs according to this.
Be compatible with the way old init passes flags (in registers).

Changed name of sigaltstack's ss_base field to ss_sp to match XPG4.2 and
traditional usage.

MicroVAX III support added; now runs on VAX 3600/3800/3900 platforms.

Allow for dynamic allocation of interrupt vectors.
COMPAT_RENO removed.
Handle memory errors.
uap->sigcntxp -> SCARG(uap, sigcntxp)

branches: 1.19.2;
Prefix names of system call implementation functions with `sys_'.

#include "sys/mount.h" added.

Make system calls conform to a standard prototype and bring those
prototypes into scope.

SA_ONSTACK --> SS_ONSTACK

Calling of pppintr() included.

rudimentary DDB support.

Enabled auto reboot. Fixed bug in conf.c. Started use of rpb.
Detecting kernel stack overflow. Removed local mapping of
sigtramp code. Frob kernel stack pages in cpu_swapin().
Cleaned up some code and changed to KNF.

Kernel message buffer implemented.

Changed conf.c to new style. Took away double saving of regs in traps.
Changed boot() to use vfs_shutdown(). Updated setregs.

Fixes to conf.c
Cleaning of code.

kernel_pmap --> pmap_kernel()

Speed-up of pmap and trap.
Fixes due to uVAX support.

Support for uVAXII, new tmscp driver added.

Zillions of bugfixes. Obsolete files taken away. New style config
fixed. Inline assembler commonly used.

Lots of fixes and updates.

new RCS ID format.

Lots of bug fixes; clock and mem files new.

branches: 1.2.2;
Lots of bug fixes. Generic console support added. Major changes in machdep.c.
pmap.c now supports user process mapping. Page faults handles correctly.

Initial VAX port merging.

Move the at-shutdown call to resettodr() from cpu_reboot() to kern_reboot().

It's a small step, but it's a step.

vax: set default RLIMIT_AS to the same as MAXDSIZ

this allows modern GCC to run without returning to the issues that
reported in PR#28379, and avoids a strange sort-of-invariant violation
where the rlimit for data equaled the rlimit for all address space, so
there is no room for text or stack etc.

ok ragge@

XXX: pullup-10

Include leds.h to make /dev/leds work.

branches: 1.196.20;
uvm_availmem(): give it a boolean argument to specify whether a recent
cached value will do, or if the very latest total must be fetched. It can
be called thousands of times a second and fetching the totals impacts not
only the calling LWP but other CPUs doing unrelated activity in the VM
system.

Rename uvm_free() -> uvm_availmem().

uvmexp.free -> uvm_free()

Retire compat_ibcs2, as discussed on tech-kern@. FreeBSD did the same
recently.

branches: 1.192.2;
Set max/dfl size for vm a process may have to the same as for data.
This avoids a problem where mmap may lock processes in the system,
and solves PR port-vax/28379.

branches: 1.191.2; 1.191.8; 1.191.16;
Fix leds.h include.

branches: 1.190.6;
use cpu_{g,s}etmodel

branches: 1.189.2; 1.189.4;
Kernel crash dumps are not properly implemented - so do not pretend they
would exist and set dumplo to 0 if dumpsize is 0. This makes savecore
happy.
XXX - implement real dumps, most of the needed code seems to be in place
already.

Calling _lwp_create() with a bogus ucontext could trigger a kernel
assertion failure (and thus a crash in DIAGNOSTIC kernels). Independently
discovered by YAMAMOTO Takashi and Joel Sing.

To avoid this, introduce a cpu_mcontext_validate() function and move all
sanity checks from cpu_setmcontext() there. Also untangle the netbsd32
compat mess slightly and add a cpu_mcontext32_validate() cousin there.

Add an exhaustive atf test case, based partly on code from Joel Sing.

Should finally fix the remaining open part of PR kern/43903.

physmem is declared by uvm

Remove COMPAT_SA / KERN_SA. Welcome to 6.99.3!
Approved by core@.

branches: 1.185.2;
converting extent(9) from malloc(9) to kmem(9)
preceding kmem-vmem-pool-uvm patch

releng@ acknowledged

define _UC_TLSBASE and use it to pass the TLS pointer to setcontext().
since there is no available space in ucontext_t on vax, pass the
TLS pointer on the stack referenced by the ucontext_t instead.
suggested by joerg.

implement bdev_size(9) wrapper around d_psize() routine, so we can take
the device lock in relevant places. avoid doing so while actually dumping.

tested i386 crash dumps still work, and that all touched files compile.

fixes PR#45705.

branches: 1.182.2; 1.182.6;
Cleanup trapframe handling. Instead of keeping a trapframe pointer in the
pcb, put in the mdlwp instead. We had a dummy field so it didn't grow in
size. This also follows the practice that mips and powerpc follow that a
pointer to the user trapframe is in l->l_md.md_utf. Make trapframe members
start with tf_

Welcome to 5.99.53! Merge rmind-uvmplock branch:

- Reorganize locking in UVM and provide extra serialisation for pmap(9).
New lock order: [vmpage-owner-lock] -> pmap-lock.

- Simplify locking in some pmap(9) modules by removing P->V locking.

- Use lock object on vmobjlock (and thus vnode_t::v_interlock) to share
the locks amongst UVM objects where necessary (tmpfs, layerfs, unionfs).

- Rewrite and optimise x86 TLB shootdown code, make it simpler and cleaner.
Add TLBSTATS option for x86 to collect statistics about TLB shootdowns.

- Unify /dev/mem et al in MI code and provide required locking (removes
kernel-lock on some ports). Also, avoid cache-aliasing issues.

Thanks to Andrew Doran and Joerg Sonnenberger, as their initial patches
formed the core changes of this branch.

branches: 1.180.6;
Cleanups includes. Change <machine/XXX.h> to <sys/XXX.h>
Remove unneeded includes.

branches: 1.179.2;
Remove separate mb_map. The nmbclusters is computed at boot time based
on the amount of physical memory and limited by NMBCLUSTERS if present.
Architectures without direct mapping also limit it based on the kmem_map
size, which is used as backing store. On i386 and ARM, the maximum KVA
used for mbuf clusters is limited to 64MB by default.

The old default limits and limits based on GATEWAY have been removed.
key_registered_sb_max is hard-wired to a value derived from 2048
clusters.

branches: 1.178.2;
- Use lwp_getpcb() on VAX, clean from struct user usage.
- Include sys/user.h in MD proc.h .

kill extra whitespaces
reviewed by tsutsui@

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>.

bcopy -> memcpy

Use "defopt MODULAR" in sys/conf/files, and #include "opt_modular.h"
in all kernel sources that use the MODULAR option.
Proposed in tech-kern on 18 Jan 2009.

branches: 1.173.2;
Re-adapt to the changed return types for major() and minor().

fix dev_t printf formats.

As discussed on tech-kern: mutex_init is too heavyweight for early bootstrap
phases, so move the initialization of the ksyms mutex back into main via
a function called ksyms_init. Rename the existing (but quite different)
ksyms_init* variations into ksyms_addsyms_elf() and ksyms_addsyms_explicit()
and adapt machdep code accordingly.

fix build for kernel configs lacking KA46, KA48, KA49 and KA53 support.
OK by mhitch.

Remove LKMs and switch to the module framework, pass 1.

Proposed on tech-kern@.

It is not appropriate to call pmf_system_shutdown(9) from
doshutdownhooks(9): shutdown hooks registered by shutdownhook_establish(9)
expect to be called with interrupts disabled, but shutdown hooks
registered with pmf_device_register1(9) expect to be called with
interrupts enabled. So I have made two changes:

1 Do not call pmf_system_shutdown() from doshutdownhooks(). Instead,
change every call to doshutdownhooks() to a call to doshutdownhooks()
followed by a call to pmf_system_shutdown(). No functional change
is intended by this change.

2 Make i386 re-enable interrupts briefly while it calls
pmf_system_shutdown(). I leave it to others either to fix the
other ports, or to factor out some MI shutdown code, as joerg@
suggests, and fix that. Note that a functional change *is* intended
by this change.

I hope that this patch will stop us from flip-flopping between
calling doshutdownhooks() and pmf_system_shutdown() sometimes with
and sometimes without interrupts enabled.

branches: 1.167.2; 1.167.4;
build fix: get prototype for cpu_upcall()

Merge wrstuden-revivesa into HEAD.

branches: 1.165.2;
Replce exec_map with a pool. Proposed on tech-kern@, reviewed by chs@.

branches: 1.164.4; 1.164.6; 1.164.8;
Rototill the vax code. Switch to devicet/PRIV_ALLOC. Cleanup vax autoconf
code. Move to prototype definitions. staticfy, constify, avoid casting.
Use device_* accessors.

A number of performance changes:
Change internal register SSP to contain curlwp insread curcpu(). This
shrinks the GENERIC by 2KB.
Add rwlock stubs (rw_enter, rw_exit, rw_tryenter).
Simplify simple lock code for uniprocessors.
Do SPL raise/lower in cpu_handle_ipi instead of simple_locks.

branches: 1.162.2; 1.162.6;
More softint fixes. We need to restore the softint lwp's pcb to it's initial
state since it may have been blocked or interrupted by another softint.

Make NetBSD/vax work again. Add support for __HAVE_FAST_SOFTINTS.
Add a few small optimizations.

Make process_sstep use ANSI declaration.

Interrupt handling changes, in discussion since February:

- Reduce available SPL levels for hardware devices to none, vm, sched, high.
- Acquire kernel_lock only for interrupts at IPL_VM.
- Implement threaded soft interrupts.

branches: 1.158.2; 1.158.18; 1.158.20; 1.158.26;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

TRUE -> true, FALSE -> false

Change the process/lwp flags seen by userland via sysctl back to the
P_*/L_* naming convention, and rename the in-kernel flags to avoid
conflict. (P_ -> PK_, L_ -> LW_ ). Add back the (now unused) LSDEAD
constant.

Restores source compatibility with pre-newlock2 tools like ps or top.

Reviewed by Andrew Doran.

branches: 1.155.2;
Partially adapt the VAX port to the newlock2 changes. These are untested
but they do at least compile.

Merge newlock2 to head.

Propagate const, prompted by new gcc.

branches: 1.152.20; 1.152.22;
bare asm -> __asm

merge ktrace-lwp.

branches: 1.150.2;
Declare the second arg of process_write_{fp,}regs() to be const.
This permits sh5 to continue to re-use those functions in cpu_setmcontext()
with the recent change to Makefile.kern.inc (revision 1.62).

Move the MI printing of `copyright' to the MD cpu_startup() code
where the printing of `version' is already performed.
This has the benefit of allowing the copyright to be available
via dmesg(8) on platforms which need the `msgbuf' to be setup
in cpu_startup() before printed output is remembered.

Rework cpu_upcall. Actually build a stack frame and argument list and
don't use a trampoline.

merge yamt-km branch.
- don't use managed mappings/backing objects for wired memory allocations.
save some resources like pv_entry. also fix (most of) PR/27030.
- simplify kernel memory management API.
- simplify pmap bootstrap of some ports.
- some related cleanups.

branches: 1.146.4; 1.146.6;
The second "console_device" node should really be called "booted_device".

branches: 1.145.2;
Tango on sysctl_createv() and flags. The flags have all been renamed,
and sysctl_createv() now uses more arguments.

Replace the traditional buffer memory management -- based on fixed per buffer
virtual memory reservation and a private pool of memory pages -- by a scheme
based on memory pools.

This allows better utilization of memory because buffers can now be allocated
with a granularity finer than the system's native page size (useful for
filesystems with e.g. 1k or 2k fragment sizes). It also avoids fragmentation
of virtual to physical memory mappings (due to the former fixed virtual
address reservation) resulting in better utilization of MMU resources on some
platforms. Finally, the scheme is more flexible by allowing run-time decisions
on the amount of memory to be used for buffers.

On the other hand, the effectiveness of the LRU queue for buffer recycling
may be somewhat reduced compared to the traditional method since, due to the
nature of the pool based memory allocation, the actual least recently used
buffer may release its memory to a pool different from the one needed by a
newly allocated buffer. However, this effect will kick in only if the
system is under memory pressure.

Strings (even ifdef'ed out) can't run past the end of the line. Use
ANSI string concatenation.

Dynamic sysctl.

Gone are the old kern_sysctl(), cpu_sysctl(), hw_sysctl(),
vfs_sysctl(), etc, routines, along with sysctl_int() et al. Now all
nodes are registered with the tree, and nodes can be added (or
removed) easily, and I/O to and from the tree is handled generically.

Since the nodes are registered with the tree, the mapping from name to
number (and back again) can now be discovered, instead of having to be
hard coded. Adding new nodes to the tree is likewise much simpler --
the new infrastructure handles almost all the work for simple types,
and just about anything else can be done with a small helper function.

All existing nodes are where they were before (numerically speaking),
so all existing consumers of sysctl information should notice no
difference.

PS - I'm sorry, but there's a distinct lack of documentation at the
moment. I'm working on sysctl(3/8/9) right now, and I promise to
watch out for buses.

Fix GCC3'ism's

Add SA_SIGINFO support for VAX.

Fix "constify sendsig/trapsignal" fallout for non-siginfo'd archs. Test
compiled on most architectures.

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

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

__KERNEL_RCSID()

branches: 1.136.2;
Make sure to include opt_foo.h if a defflag option FOO is used.

Call ksyms_init() instead of ddb_init() in case of
NKSYMS || defined(DDB) || defined(LKM)

Use PAGE_SIZE rather than NBPG.

Add machdep sysctl support. Support booted_device, consdev, and
printfataltraps.

Merge the nathanw_sa branch.

Fix inconsistencies in various definitions of avail_*, virtual_*, and
proc0paddr.

Fix for a problem where an user can crash the machine via sigreturn(),
noticed by and fix from Miod Vallat <miod@openbsd.org>.

Miod's OpenBSD log message:
> Don't uvm_useracc the user sigcontext in sys_sigreturn and then access
> the user addresses directly from the kernel. copyin is faster and can
> correctly deal properly with mappings that uvm_useracc thinks are
> correct but will fault anyway (to figure out how to generate such
> mappings is left as en excercise for the reader).
>
> Blatantly stolen from art@'s similar fix to sparc.

Add common routines to talk with the CPMBX, from Hugh Graham (hugh@openbsd.org)
This makes halt/reboot work correctly on a bunch of machines.

Don't use rmaps; use extent maps instead.

Fix a signal handler bug originally reported by Hugh Graham some year ago:
If two signals are sent after each other without the process being run in
userspace between them then the second one will overwrite part of the signal
info stored on the userstack.
Fixed by rewriting and simplifying both the signal delivery code and the
trampoline code. Also bump signal version number to 2.

Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant structure in device drivers.

- The new grammer ``device-major'' is introduced to ``files''.

device-major <prefix> char <num> [block <num>] [<rules>]

- All device major numbers must be listed up in port dependent majors.<arch>
by using this grammer.

- Added the new naming convention.
The name of the device switch must be <prefix>_[bc]devsw for auto-generation
of device switch tables.

- The backward compatibility of loading block/character device
switch by LKM framework is broken. This is necessary to convert
from block/character device major to device name in runtime and vice versa.

- The restriction to assign device major by LKM is completely removed.
We don't need to reserve LKM entries for dynamic loading of device switch.

- In compile time, device major numbers list is packed into the kernel and
the LKM framework will refer it to assign device major number dynamically.

Make nbuf, nswbuf, and bufpages unsigned. Make all operations on these
variables unsigned, and update places where their values are printed.

Add kernel support for having userland provide the signal trampoline:

* struct sigacts gets a new sigact_sigdesc structure, which has the
sigaction and the trampoline/version. Version 0 means "legacy kernel
provided trampoline". Other versions are coordinated with machine-
dependent code in libc.
* sigaction1() grows two more arguments -- the trampoline pointer and
the trampoline version.
* A new __sigaction_sigtramp() system call is provided to register a
trampoline along with a signal handler.
* The handler is no longer passed to sensig() functions. Instead,
sendsig() looks up the handler by peeking in the sigacts for the
process getting the signal (since it has to look in there for the
trampoline anyway).
* Native sendsig() functions now select the appropriate trampoline and
its arguments based on the trampoline version in the sigacts.

Changes to libc to use the new facility will be checked in later. Kernel
version not bumped; we will ride the 1.6C bump made recently.

branches: 1.123.2;
Make ddb symbol loading work for ELF as well a.out.

Change type of dumpmag to u_int32_t since it is actually
a 32bit unsigned magic number.
As per discussion on tech-kern, and fixes port-sparc64/11949.

Move .s files to .S files. (and .s.o rules in boot/Makefile.inc)
Put in register prefixes everywhere.

branches: 1.120.4;
Update pmap_update to now take the updated pmap as an argument.
This will allow improvements to the pmaps so that they can more easily defer expensive operations, eg tlb/cache flush, til the last possible moment.

Currently this is a no-op on most platforms, so they should see no difference.

Reviewed by Jason.

branches: 1.119.2;
use pmap_k* for buffer cache pages.

branches: 1.118.2;
Do more intelligent calculation of KVM size. This reduces the amount of
pre-allocated physical memory significantly.
A 11/750, for example, get 2MB more free (of 14MB), about 12%.

replace vm_map{,_entry}_t with struct vm_map{,_entry} *.

Must lock kernel when softclock is called from outside hardclock.

Use the symtab info given by loadfile in the booter instead of assuming
we know where it is. This is a requirement for ELF.

Move RB_KDB check to after VM is init so that there's an
interrupt stack for DDB to run on. This makes boot -d work.

Sprinkle pmap_update() calls after calls to:
- pmap_enter()
- pmap_remove()
- pmap_protect()
- pmap_kenter_pa()
- pmap_kremove()
as described in pmap(9).

These calls are relatively conservative. It may be possible to
optimize these a little more.

eliminate the KERN_* error codes in favor of the traditional E* codes.
the mapping is:

KERN_SUCCESS 0
KERN_INVALID_ADDRESS EFAULT
KERN_PROTECTION_FAILURE EACCES
KERN_NO_SPACE ENOMEM
KERN_INVALID_ARGUMENT EINVAL
KERN_FAILURE various, mostly turn into KASSERTs
KERN_RESOURCE_SHORTAGE ENOMEM
KERN_NOT_RECEIVER <unused>
KERN_NO_ACCESS <unused>
KERN_PAGES_LOCKED <unused>

branches: 1.111.2;
Make softclock a generic soft interrupt of the API is available,
adding the requisite void * argument to softclock().

split off thread specific stuff from struct sigacts to struct sigctx, leaving
only signal handler array sharable between threads
move other random signal stuff from struct proc to struct sigctx

This addresses kern/10981 by Matthew Orgass.

add a clarifying comment.

Add an align argument to uvm_map() and some callers of that
routine. Works similarly fto pmap_prefer(), but allows callers
to specify a minimum power-of-two alignment of the region.
How we ever got along without this for so long is beyond me.

By some reason setstatclockrate() suddenly get called occationally
(it hasn't been called since -94 :-) Remove the panic that happens when
it is called.

Add bi interrupt allocator. Should be somewhere else.

Kwality control:
* put #includes of opt headers and headers to get protos used by
net/netisr_dispatch.h in net/netisr.h (if !defined(_LOCORE)) (rather than
in netisr_dispatch.h itself, and potentially nowhere, respectively).
* require netisr.h to be included before netisr_dispatch.h.
* minor additional cleanup of both netisr.h and netisr_dispatch.h.
* clean up uses to remove now-unnecessary header file inclusions, and
local prototypes of the fns.
* convert netisr dispatch implementations which didn't use
netisr_dispatch.h (pc532) to use it.

remove include of <vm/vm.h>. <vm/vm.h> -> <uvm/uvm_extern.h>

remove/move more mach vm header files:

<vm/pglist.h> -> <uvm/uvm_pglist.h>
<vm/vm_inherit.h> -> <uvm/uvm_inherit.h>
<vm/vm_kern.h> -> into <uvm/uvm_extern.h>
<vm/vm_object.h> -> nothing
<vm/vm_pager.h> -> into <uvm/uvm_pager.h>

also includes a bunch of <vm/vm_page.h> include removals (due to redudancy
with <vm/vm.h>), and a scattering of other similar headers.

Do not clear msgbufenabled in dumpsys(). Dump messages will now go to
the message buffer. This can be invaluable in debugging if the dump
fails (assuming a persistant message buffer)

Add IPL_* codes.
Add other codes for struct references.
Add softintr framework for IPL_SOFTNET and IPL_SOFTSERIAL.
General cleanup of .s files replacing hardcoded structure offsets with
symbolic ones.

Use the cpu_info struct to store cpu-specific data in the same way in
both uniprocessor and multiprocessor environments. Use the otherwise
unused internal CPU register SSP to store the cpu_info pointer.
The macros curcpu(), curproc, cpu_number() and need_resched() are now the
same in both uniprocessor and multiprocessor environments.

branches: 1.99.2;
First sweep at scheduler state cleanup. Collect MI scheduler
state into global and per-CPU scheduler state:

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

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

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

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

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

Call doshutdownhooks().

Centralise the declarations of cpu_model, machine, machine_arch,
osrelease, and ostype and remove "extern char foo[];" (for hostname
and domainname too).

Also delete redunctant decl of boottime in kern_info_43.c.

First cut of multiprocessor support for vax. Still much to do before
other CPUs than the master can spin up.

add real vmapbuf/vunmapbuf routines. needed for VS4000 SCSI support.

expunge vm_offset_t and vm_size_t.
add bus_dma support for the vs4000 dma translation map (sgmap).
enhance the vsbus for the lance to work with it.
remove the sgmap init code from ka46/48/49.c

Move callout initialization to a single location; no need to duplicate
that code all over the place.

Bogus context pointer sent to sigreturn() may crash the machine.
Bug found by der Mouse.

CL* discarding.
Move physmem setting to pmap_bootstrap().
Fix security problem in process_write_regs(), found by Klaus Klein.

Update for pmap_enter() API change. No functional difference.

Let smg be probed as all other possible consoles.

Remove the vmapbuf()/vunmapbuf() routines. They are quite unneccessary
on a machine that has MMU for its I/O devices.

branches: 1.87.2; 1.87.4; 1.87.6;
Centralize the declaration and clearing of `cold'.

PGOFSET should be VAX_PGOFSET.
Remove two unused prototypes.

Clean up all bus handling stuff, it has become a mess the latest years.
Add a new bus; "ibus" that is the internal MicroVAX bus.

Change the vm_map's "entries_pageable" member to a r/o flags member, which
has PAGEABLE and INTRSAFE flags. PAGEABLE now really means "pageable",
not "allocate vm_map_entry's from non-static pool", so update all map
creations to reflect that. INTRSAFE maps are maps that are used in
interrupt context (e.g. kmem_map, mb_map), and thus use the static
map entry pool (XXX as does kernel_map, for now). This will eventually
change now these maps are locked, as well.

* convert to using MI allocsys(). most ports were using an MD allocsys(),
although a couple still used the old pre-4.4-lite (?) mechanism.
* use format_bytes() to format the various printf()s that print out memory sizes

EEEK! The signal changes a while ago caused the user struct to be
on top of the "red zone" in the kernel stack. This phenomenon has
caused many unexplainable things to happen the last year.

Real-time clock is started on the same way on all CPUs, there is no
need for a special CPU-dependent hook for this.

g/c REAL_CLISTS.

Use "access_type" in pmap_enter() more intelligent.
Allocate device register space bigger than the logical page size
from the kernel map, thus decreasing the pre-allocated page table memory.

Use the pool allocator for mbufs instead of a separate submap.

add a `flags' argument to uvm_pagealloc_strat().
define a flag UVM_PGA_USERESERVE to allow non-kernel object
allocations to use pages from the reserve.
use the new flag for allocations in pmap modules.

branches: 1.76.2;
Don't call configure() from cpu_startup().

Changes for modified pmap_enter() API:
* Map the message buffer with access_type = VM_PROT_READ|VM_PROT_WRITE `just
because'.
* Map the file system buffers with access_type = VM_PROT_READ|VM_PROT_WRITE to
avoid possible problems with pagemove().
* Do not use VM_PROT_EXEC with either of the above.
* Map pages for /dev/mem with access_type = prot. Also, DO NOT use
pmap_kenter() for this, as we DO NOT want to lose modification information.
* Map pages in dumpsys() with VM_PROT_READ.
* Map pages in m68k mappedcopyin()/mappedcopyout() and writeback() with
access_type = prot.
* For now, bus_dma*(), pmap_map(), vmapbuf(), and similar functions still use
access_type = 0. This should probably be revisited.

completely remove Mach VM support. all that is left is the all the
header files as UVM still uses (most of) these.

Change vsbus to take a locator for all devices.
Figure out interrupt vector/mask on vsbus by forcing all devices to
generate interrupts in the match routine, like on unibus.

defopt BUFCACHE and BUFPAGES.

Another giant change: Allocate register space dynamic instead of compiled-in.
This is done on a physical page size basis, instead of virtual (as the
(on vax yet non-existing) bus_* routines does). This is similar to the
way uba allocation is done.

Allocate (almost) all interrupt vectors dynamically. Simplifies much
work when adding support for new machines and devices.

Garbage-collect `mbutl'.

Fix bufpages miscalculation. At the same time, make bufpages configurable
att compile time.

uvm_km_alloc -> uvm_km_zalloc.

EGCS fixes.

Defopt SYSVMSG, SYSVSEM and SYSVSHM.

Provide configure(), rather than open-coding it in cpu_startup().

Change backplace0 to mainbus0 (for consistency with other ports).
Remove unused function protocols from ka410.h and ka43.h
Fix some ka46 missing references

use old sigmask in sigcontext and old sigreturn syscall in Ultrix
emulation mode

Make kernel compile after recent signal changes.

defopt NS, NSIP.

defopt INET, NETATALK.

defopt DDB.

Fix after current DDB changes.

Wall fixes.

Rudimentary support for the VS3100 builtin graphics console.

Fix some arithmetics lossage on typeless pointers.

Support for UVM on VAXen.

Disable the message buffer during crash dumps by clearing msgbufenabled,
not msgbufmapped.

When dumping, print out the device number as major,minor.

Move some interrupt routines out to assembler.
Optimize (slightly) pmap_clear_modify.

Optimized copy/fetch/store routines; rewritten in assembler.

Fix clearing of redundant restart flag; CPU specific.
Also clean up a bit.

branches: 1.47.2;
#include <vm/vm.h>. Fix some erroneous declarations.

Implement the kernel part of pr-1891. This allows for a more flexible sized
msgbuf. Note that old 'dmesg' and 'syslogd' binaries will continue running,
though old 'dmesg' binaries will output a few bytes of junk at the start of
the buffer, and will miss a few bytes at the end of the buffer.

branches: 1.45.2; 1.45.4;
Actually do 'halt' or 'reboot' on MicroVAX.

bring mrg-vm-swap2 onto mainilne.

Initialize machine from MACHINE and machine_arch from MACHINE_ARCH.

Add 'char machine_arch[] = "xxx";' for the new sysctl hw.machine_arch.

branches: 1.41.2;
Fix so that these files compile again after recent ARP changes.

Add netatalk netisr

Don't allocate mclrefcnt[]; it's dead and gone.

Renames: /dumpconf/cpu_dumpconf/, /boot/cpu_reboot/

Clean up console autoconfiguration so that the VAXstation DZ11-like
console work.

Basic change to cpu-config code. This will make support of new
cpu types much easier.

branches: 1.35.4; 1.35.6;
Prototype updates.

backout previous kprintf change

printf -> kprintf, sprintf -> ksprintf

Change reboot(2) to take two arguments: bootopt like normal and also
a boot string for firmware that can do this, such as the SPARC and
the sun3 models. It is currently silently ignored on all other
hardware now, however. The MD function "boot()" has been changed to
also take a char *.

Reflect the changes of CPU determination. Add support for VAXstations.

Fixed all (proto)type errors. Fixes PR 2377.

Added prototypes to everything. Made all files compile with -Wall.

Support for VAX 8600/8650 added. Works with lots of Unibus adapters,
and will probably work with Massbus adapters as well. (Not tested,
but it's the same code as for 11/780). Ubareset's may cause crashes
on 8600 also like 11/780, but they are more uncommon. No support
for console RL02 yet, but it's likely to come.

Fix fuswintr/suswintr arguments to match prototype.

Support for VAX 11/780 - 11/785 system types added.
There are no support (yet) for the RX01 console floppy,
even if it is actually needed to create boot floppies.
(The arff utility is also missing, so...)

Fix cpu_sysctl() arguments to be like prototype.

Fix #includes.

Save USP when trapping from userspace.
Change register save structs according to this.
Be compatible with the way old init passes flags (in registers).

Changed name of sigaltstack's ss_base field to ss_sp to match XPG4.2 and
traditional usage.

MicroVAX III support added; now runs on VAX 3600/3800/3900 platforms.

Allow for dynamic allocation of interrupt vectors.
COMPAT_RENO removed.
Handle memory errors.
uap->sigcntxp -> SCARG(uap, sigcntxp)

branches: 1.19.2;
Prefix names of system call implementation functions with `sys_'.

#include "sys/mount.h" added.

Make system calls conform to a standard prototype and bring those
prototypes into scope.

SA_ONSTACK --> SS_ONSTACK

Calling of pppintr() included.

rudimentary DDB support.

Enabled auto reboot. Fixed bug in conf.c. Started use of rpb.
Detecting kernel stack overflow. Removed local mapping of
sigtramp code. Frob kernel stack pages in cpu_swapin().
Cleaned up some code and changed to KNF.

Kernel message buffer implemented.

Changed conf.c to new style. Took away double saving of regs in traps.
Changed boot() to use vfs_shutdown(). Updated setregs.

Fixes to conf.c
Cleaning of code.

kernel_pmap --> pmap_kernel()

Speed-up of pmap and trap.
Fixes due to uVAX support.

Support for uVAXII, new tmscp driver added.

Zillions of bugfixes. Obsolete files taken away. New style config
fixed. Inline assembler commonly used.

Lots of fixes and updates.

new RCS ID format.

Lots of bug fixes; clock and mem files new.

branches: 1.2.2;
Lots of bug fixes. Generic console support added. Major changes in machdep.c.
pmap.c now supports user process mapping. Page faults handles correctly.

Initial VAX port merging.

vax: set default RLIMIT_AS to the same as MAXDSIZ

this allows modern GCC to run without returning to the issues that
reported in PR#28379, and avoids a strange sort-of-invariant violation
where the rlimit for data equaled the rlimit for all address space, so
there is no room for text or stack etc.

ok ragge@

XXX: pullup-10

Include leds.h to make /dev/leds work.

uvm_availmem(): give it a boolean argument to specify whether a recent
cached value will do, or if the very latest total must be fetched. It can
be called thousands of times a second and fetching the totals impacts not
only the calling LWP but other CPUs doing unrelated activity in the VM
system.

Rename uvm_free() -> uvm_availmem().

uvmexp.free -> uvm_free()

Retire compat_ibcs2, as discussed on tech-kern@. FreeBSD did the same
recently.

branches: 1.192.2;
Set max/dfl size for vm a process may have to the same as for data.
This avoids a problem where mmap may lock processes in the system,
and solves PR port-vax/28379.

branches: 1.191.2; 1.191.8; 1.191.16;
Fix leds.h include.

branches: 1.190.6;
use cpu_{g,s}etmodel

branches: 1.189.2; 1.189.4;
Kernel crash dumps are not properly implemented - so do not pretend they
would exist and set dumplo to 0 if dumpsize is 0. This makes savecore
happy.
XXX - implement real dumps, most of the needed code seems to be in place
already.

Calling _lwp_create() with a bogus ucontext could trigger a kernel
assertion failure (and thus a crash in DIAGNOSTIC kernels). Independently
discovered by YAMAMOTO Takashi and Joel Sing.

To avoid this, introduce a cpu_mcontext_validate() function and move all
sanity checks from cpu_setmcontext() there. Also untangle the netbsd32
compat mess slightly and add a cpu_mcontext32_validate() cousin there.

Add an exhaustive atf test case, based partly on code from Joel Sing.

Should finally fix the remaining open part of PR kern/43903.

physmem is declared by uvm

Remove COMPAT_SA / KERN_SA. Welcome to 6.99.3!
Approved by core@.

branches: 1.185.2;
converting extent(9) from malloc(9) to kmem(9)
preceding kmem-vmem-pool-uvm patch

releng@ acknowledged

define _UC_TLSBASE and use it to pass the TLS pointer to setcontext().
since there is no available space in ucontext_t on vax, pass the
TLS pointer on the stack referenced by the ucontext_t instead.
suggested by joerg.

implement bdev_size(9) wrapper around d_psize() routine, so we can take
the device lock in relevant places. avoid doing so while actually dumping.

tested i386 crash dumps still work, and that all touched files compile.

fixes PR#45705.

branches: 1.182.2; 1.182.6;
Cleanup trapframe handling. Instead of keeping a trapframe pointer in the
pcb, put in the mdlwp instead. We had a dummy field so it didn't grow in
size. This also follows the practice that mips and powerpc follow that a
pointer to the user trapframe is in l->l_md.md_utf. Make trapframe members
start with tf_

Welcome to 5.99.53! Merge rmind-uvmplock branch:

- Reorganize locking in UVM and provide extra serialisation for pmap(9).
New lock order: [vmpage-owner-lock] -> pmap-lock.

- Simplify locking in some pmap(9) modules by removing P->V locking.

- Use lock object on vmobjlock (and thus vnode_t::v_interlock) to share
the locks amongst UVM objects where necessary (tmpfs, layerfs, unionfs).

- Rewrite and optimise x86 TLB shootdown code, make it simpler and cleaner.
Add TLBSTATS option for x86 to collect statistics about TLB shootdowns.

- Unify /dev/mem et al in MI code and provide required locking (removes
kernel-lock on some ports). Also, avoid cache-aliasing issues.

Thanks to Andrew Doran and Joerg Sonnenberger, as their initial patches
formed the core changes of this branch.

branches: 1.180.6;
Cleanups includes. Change <machine/XXX.h> to <sys/XXX.h>
Remove unneeded includes.

branches: 1.179.2;
Remove separate mb_map. The nmbclusters is computed at boot time based
on the amount of physical memory and limited by NMBCLUSTERS if present.
Architectures without direct mapping also limit it based on the kmem_map
size, which is used as backing store. On i386 and ARM, the maximum KVA
used for mbuf clusters is limited to 64MB by default.

The old default limits and limits based on GATEWAY have been removed.
key_registered_sb_max is hard-wired to a value derived from 2048
clusters.

branches: 1.178.2;
- Use lwp_getpcb() on VAX, clean from struct user usage.
- Include sys/user.h in MD proc.h .

kill extra whitespaces
reviewed by tsutsui@

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>.