CVS log for src/sys/arch/newsmips/newsmips/machdep.c

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Default branch: MAIN

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

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

Remove unnecessary <sys/malloc.h>.

Sync with HEAD

Sync with head

Reorganize APbus zs(4) console handling.

- set sccport0a address on early startup and use it for cnputc and cngetc
- explicitly initialize zs chip in the cninit function so that zs console
  can be used even if it is not initialized by PROM firmware

Tested on both news50000 and news4000.

Add NWS-4000 support.

Based on nonaka@'s porting effort back in 2002.
See announcement on port-newsmips@ for more details:
 http://mail-index.netbsd.org/port-newsmips/2018/10/13/msg000231.html

update from HEAD

Sync with HEAD

Sync with HEAD.  (Note that most of these changes are simply $NetBSD$
tag issues.)

switch all ports to use uvm_init.c:uvm_md_init()

uvm_setpagesize() is now subsumed within this funciton.

Sync with HEAD

Sync with HEAD

Don't include <mips/locore.h> in <machine/intr.h>, introduces circular
dependencies; instead include it in the 4 driver files that need it,
and reorder it in machdep.c

Sync with HEAD

Use cpu_startup_common()

avoid shadowing a new global.

Rebase to HEAD as of a few days ago.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

sync with head

- fix unused
- use cpu_{g,s}etmodel

sync with head

Fix -fno-common fallout.

mem_cluster_cnt on mips is now a u_int.

Sync with HEAD.

sync with head

Fix newsmips interrupt handling for new mips interrupt/spl framework:
 - make news3400_badaddr() work even if interrupts are disabled
   (in the old world bus error interrupt is enabled even during splhigh())
 - make ipl_sr_map values model dependent

Now GENERIC kernel boots to single user properly on R3000 NWS-3470D,
though sh(1) still gets floating point exceptions during /etc/rc scripts.
news5000 is untested (yet).

sync with head

Sync with HEAD

Merge forward matt-nb5-mips64
Adapt to new interrupt/spl framework

Sync with HEAD

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

Extra verification by snj@.

Adapt to the new interrupt framework.
Use mips_set_wbflush instead of playing preprocessor games.

Move counting of faults, traps, intrs, soft[intr]s, syscalls, and nswtch
from uvmexp to per-cpu cpu_data and move them to 64bits.  Remove unneeded
includes of <uvm/uvm_extern.h> and/or <uvm/uvm.h>.

Sync with HEAD.

mips_vector_init now takes an argument to specify splsw.
NULL specifies use the default 'std_splsw'

sync with head

Remove fs_mfs.h from users because it is now unnecessary and don't
generate fs_mfs.h anymore.

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.

Change to deal with new method of invoking softints.  Remove mips/softintr.c
from config files.  Fix SYMTAB_SPACE for WGT62V43

fix fallout from frame/trapframe merger.

Adjust things to the new world order.

More changes to make newsmips compile (include "assym.h, remove unused
variables, etc.)

Merge from matt-nb5-mips64
Merge mips-specific arch files.

- Use uvm_lwp_setuarea() instead of directly setting address to lwp_t::l_addr.
- Replace most remaining uses of l_addr with uvm_lwp_getuarea() or lwp_getpcb().
- Amend assembly in ports where it accesses PCB via struct user.
- Rename L_ADDR to L_PCB in few places.  Reduce sys/user.h inclusions.

Kill proc0paddr.  Use lwp0.l_addr instead.

Deal with pcb_context being a label_t

sync with head.

Remove all declarations of physmem from sys/arch.  Add an include of
<sys/systm.h> to the one file that did not already contain it.
This now means that physmem can be changed by updating systm.h and uvm_page.c
(excluding fixing printfs)

Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.

sync with head.

Sync with HEAD.

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.

Sync with HEAD.

Sync with HEAD.

Update haad-dm branch to haad-dm-base2.

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.

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.

Sync with wrstuden-revivesa-base-2.

Sync with head.

Sync with HEAD.

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

Per discussion with ad, remove most of the #include <sys/sa.h> lines
as they were including sa.h just for the type(s) needed for syscallargs.h.

Instead, create a new file, sys/satypes.h, which contains just the
types needed for syscallargs.h. Yes, there's only one now, but that
may change and it's probably more likely to change if it'd be difficult
to handle. :-)

Per discussion with matt at n dot o, add an include of satypes.h to
sigtypes.h. Upcall handlers are kinda signal handlers, and signalling
is the header file that's already included for syscallargs.h that
closest matches SA.

This shaves about 3000 lines off of the diff of the branch relative
to the base. That also represents about 18% of the total before this
checkin.

I think this reduction is very good thing.

Initial checkin of re-adding SA. Everything except kern_sa.c
compiles in GENERIC for i386. This is still a work-in-progress, but
this checkin covers most of the mechanical work (changing signalling
to be able to accomidate SA's process-wide signalling and re-adding
includes of sys/sa.h and savar.h). Subsequent changes will be much
more interesting.

Also, kern_sa.c has received partial cleanup. There's still more
to do, though.

sync with HEAD

Sync with HEAD.

Sync with HEAD.

sync with head

Sync with HEAD.

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.

sync with HEAD

Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree.  Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches.  The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

Sync with HEAD

sync with head.

Sync with head.

Sync with head.

Use C99 initializers.

No need to clear BSS if running kernel is loaded by the native bootloader.

Print NEWS model name right after copyright and version
as other mips ports.

Sync with head.

Update to HEAD.

merge yamt-idlelwp branch.  asked by core@.  some ports still needs work.

from doc/BRANCHES:

	idle lwp, and some changes depending on it.

	1. separate context switching and thread scheduling.
	   (cf. gmcgarry_ctxsw)
	2. implement idle lwp.
	3. clean up related MD/MI interfaces.
	4. make scheduler(s) modular.

- Further adaptations to MIPS for the yamt-idlelwp branch.
- Make curlwp a register variable on MIPS.

Sync with HEAD.

Change local variables kernend and v to char*, since they are used
for pointer arithmetic.

semimechanically convert 'void foo' -> 'void *foo', as part of the continuing
caddr_t fallout.

Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

TRUE -> true, FALSE -> false

sync with head.

Merge newlock2 to head.

Sync with head.

Remove support for SA. Ok core@.

Remove duplicate #includes, patch contributed in private mail
by Slava Semushin <slava.semushin@gmail.com>.

To verify that no nasty side effects of duplicate includes (or their
removal) have an effect here, I've compiled an i386/ALL kernel with
and without the patch, and the only difference in the resulting .o
files was in shifted line numbers in some assert() calls.
The comparison of the .o files was based on the output of "objdump -D".

Thanks to martin@ for the input on testing.

Sync with head.

sync with head.

merge yamt-splraiseipl branch.

	- finish implementing splraiseipl (and makeiplcookie).
	  http://mail-index.NetBSD.org/tech-kern/2006/07/01/0000.html
	- complete workqueue(9) and fix its ipl problem, which is reported
	  to cause audio skipping.
	- fix netbt (at least compilation problems) for some ports.
	- fix PR/33218.

Sync with head.

fix softintr for following ports.  (hopefully)
	hpcmips
	evbmips
	algor
	arc
	ews4800mips
	newsmips

sync with head.

Switch newsmips to timecounters. From gdamore@ on port-newsmips
with one tweak by me, and regressions passed on NWS-5000.

sync with head

sync with head.

Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.

Sync with head.

sync with head - hopefully this will work

sync with head

Remove declarations for cpu_model[] since it's in <sys/systm.h>.

merge ktrace-lwp.

Sync with HEAD. Here we go again...

sync with -current

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.

sync with head.

Sync with HEAD.

Oops, backout previous. They are actually needed there.

Remove function decls which are in <machine/intr.h>

Misc cleanup:
- ANSI function decls
- remove __P()
- u_intNN_t -> uintNN_t
- remove register decls
- bcopy -> memcpy, strcpy
- bzero -> memset
- bcmp -> memcmp
- use malloc(9) with M_ZERO
- some KNF
etc.

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD

Uppercase CPU, plural is CPUs.

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.

Move initialization of `ssym' and `esym' to inside of
#if NKSYMS || defined(DDB) || defined(LKM) ... #endif.

Now GENERIC and INSTALL kernel can be compiled again.

Suppress uninitialized warnings.

Cast through (void *) to appease gcc3. (now it's also warned on mipseb)

Switch to use MI mk48txx(4) and todr(9) for MK48T02 todclocks on newsmips.

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

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

Add MI softintr(9) support with common mips/softintr.c.

- Declare common functions in cpu.h
- Rename some machine dependent functions for consistency.
- Remove register declarations.
- Some KNF.

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

- remove obsolete #if 0'ed out code
- remove some leading/trailing spaces

Use PAGE_SIZE rather than NBPG.

Merge the nathanw_sa branch.

Catch up to -current.

sync kqueue with -current; this includes merge of gehenna-devsw branch,
merge of i386 MP branch, and part of autoconf rototil work

LWPify

Don't include <sys/map.h>.

sync kqueue branch with HEAD

catch up with -current.

Catch up to -current.

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

Catch up to -current.

Merge cpu_sysctl() for all mips ports, based on powerpc and m68k precedent.

For now, only pmax implements CPU_BOOTED_KERNEL.  Need to revisit.

Curproc->curlwp renaming.

Change uses of "curproc->l_proc" back to "curproc", which is more like the
original use. Bare uses of "curproc" are now "curlwp".

"curproc" is now #defined in proc.h as ((curlwp) ? (curlwp)->l_proc) : NULL)
so that it is always safe to reference curproc (*de*referencing curproc
is another story, but that's always been true).

#include <sys/sa.h> before <sys/syscallargs.h>, to provide sa_upcall_t
now that <sys/param.h> doesn't include <sys/sa.h>.

(Behold the Power of Ed)

Catch up to -current.
(CVS: It's not just a program. It's an adventure!)

Catch up with -current.

Provide a L2 cache configuration function.

Sync kqueue branch with -current.

file machdep.c was added on branch nathanw_sa on 2002-04-01 07:41:43 +0000

Merge the thorpej-mips-cache branch onto the trunk.  This is an
overhaul of how caches are handled for NetBSD's MIPS ports.

Make the newsmips port compile with the thorpej-mips-cache branch.

Catch up with -current.

Update the kqueue branch to HEAD.

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.

Catch up to -current.

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

Do the first allocsys() pass (the pass that computes sizes) before
calling pmap_bootstrap(); pmap_bootstrap() needs some of the size
information computed by allocsys().

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.

Call pmap_bootstrap() before calling uvm_pageboot_alloc(), so that
the kernel virtual address space bounds will be set up.

Sync with HEAD.

Use uvm_pageboot_alloc() for early memory allocation, rather than
calling pmap_steal_memory() directly.  On these platforms, since
uvm_pageboot_alloc() is a wrapper around pmap_steal_memory(), there
is no functional change.  This is merely for API consistency.

Catch up with -current.

Sync with HEAD.

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>

Sync with HEAD.

Remove obsolete cpu_exec_ecoff_hook().

Require the machine-dependant DDB commands to be in db_machine_command_table[]
and link it directly to db_command_table[] so that it's not necessary
to do this at runtime. Make db_machine_command_table[] const on all ports.
g/c now unneded stuff, like db_machine_commands_install(), db_machine_init()

Patch written by enami.

Sync with head (for UBC+NFS fixes, mostly).

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

Sync with HEAD.

Consistently use pmap_steal_memory() to allocate USPACE.

Update thorpej_scsipi to -current as of a month ago
A i386 GENERIC kernel compiles without the siop, ahc and bha drivers
(will be updated later). i386 IDE/ATAPI and ncr work, as well as
sparc/esp_sbus. alpha should work as well (untested yet).
siop, ahc and bha will be updated once I've updated the branch to current
-current, as well as machine-dependant code.

Make this compile without "options news5000".

Support scsi boot device for NWS-5000.
Support NWS-3700, which is very similar with NWS-3400.
Do not depend on modelid of idrom, which is useless in most cases.

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.

pullup from trunk (approved by thorpej):
retire RB_DFLTROOT, it's no longer used

revisions pulled up:
arch/i386/stand/lib/netbsd_opts.c	1.3
arch/i386/stand/biosboot/main.c		1.23
arch/i386/stand/dosboot/main.c		1.15
arch/i386/stand/netboot/main.c		1.6
arch/arc/arc/machdep.c			1.42
arch/bebox/stand/boot/boot.c		1.11
arch/hpcmips/hpcmips/machdep.c		1.32
arch/newsmips/newsmips/machdep.c	1.45
arch/pc532/stand/boot/boot.c		1.2
arch/pmax/pmax/machdep.c		1.178
arch/prep/stand/boot/boot.c		1.2
arch/sparc/sparc/autoconf.c		1.141
arch/sparc64/sparc64/autoconf.c		1.38
arch/x68k/stand/loadbsd/loadbsd.c	1.5
arch/mvme68k/stand/libsa/parse_args.c	1.6
compat/osf1/osf1_cvt.c			1.9
sys/reboot.h				1.17

g/c RB_DFLTROOT

I've tried hard to find also various usage() messages and remove the
appropriate flag from there as well, hopefully all occurences are covered.

Pull up cpu_intr() prototype + platform dependent machdeps.
(approved by thorepj).

Use cpu_intr() definition from mips/cpu.h instead of local one.

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.

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.

Adapt cpu_intr change.

Make sure proc0 PCB has spl0 condition in CP0 status register field.

cpu_fork() mistakenly created processes forked by proc0, including
kthreads, in splhigh condition, because [1] proc0's PCB was zero
cleared during initialization, and [2] value 0 in status register
field made processes to have splhigh condition when CPU tick was
assigned for them.  This mostly doesn't matter as forked processes
dive immediately into user mode through proc_trampoline code path,
however, kthreads never do that and remain in splhigh.

Reported by Ethan Solomita <ethan@geocast.com>.

Make clearer a bit how proc0's USPACE is intialized.

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

check whether tv_usec >= 1000000

Pull up to last week's -current.

Use software interrupt.

Remove 2 more unnecessary debugging codes.

First cut of news5000 support.
Mostly from SHIMIZU Ryo <dejiko@di.gi.charat.org>.

Introduce bootinfo.

CL* discarding.

Centralize the declaration and clearing of `cold'.

eliminate the PMAP_NEW option by making it required for all ports.
ports which previously had no support for PMAP_NEW now implement
the pmap_k* interfaces as wrappers around the non-k versions.

Sync w/ -current.

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

- Move MachSetPID(1) call to pmap_bootstrap() adajacent to kernel pmap
initialization code.
- Abandon mips_init_proc0() and do the 4 lines straightly in MD mach_init().
- Restore a block of code accidentally lost in prevous commit.
- Change the term 'tlbpid' to a MIPS3 nomenclature 'asid'.
- Hide PTE size exposures by symbolic names in locore.S

pull up 1.24 -> 1.25:
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.

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.

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.

<mips/db_machdep.h> --> <machine/db_machdep.h>

Don't bother allocating mb_map on these systems.  Mbuf clusters are
allocated from a pool, and the MIPS and Alpha use KSEG to map pool
pages.  So, mb_map wasn't actually being used.  Saves around 4MB of
kernel virtual address space in a typical configuration.

Garbage-collect the related VM_MBUF_SIZE constant.

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

- Nuke USPACE for now-defunct 'nullproc' pcb (8KB saving).

Garbage-collect `mbutl'.

Make configurable with no frame buffer.

This should need opt_execfmt.h.

Change vm_offset_t to [pv]addr_t.

Define one page free list, and put all pages on it.

defopt DDB.

Introduce newsmips_intr_t for intrcnt[].

Add support for powerdown.

Add UVM support.

Fix a typo.

Add NWS-3401's systype.

Rename NetBSD/news to NetBSD/newsmips.

Use allocsys(), mips_init_msgbuf(), and mips_init_proc0(), plus small
changes for MACHINE_NEW_NONCONTIG.

Set the VM page size after clearing the BSS segment.

Use the generic NetBSD/mips crash dump code.

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

Include MFS option header.

Initial import of NetBSD/news.