CVS log for src/sys/arch/x68k/x68k/locore.s

Up to [cvs.NetBSD.org] / src / sys / arch / x68k / x68k

Request diff between arbitrary revisions

Keyword substitution: kv
Default branch: MAIN

spelling and grammar fixes, mainly in comments.

Pull up following revision(s) (requested by rin in ticket #724
to fix build fallout on the branch):

	sys/arch/m68k/m68k/compat_16_sigreturn14.s: revision 1.6
	sys/arch/mvme68k/mvme68k/locore.s: revision 1.129
	sys/arch/news68k/news68k/locore.s: revision 1.84
	sys/arch/hp300/hp300/locore.s: revision 1.183
	sys/arch/m68k/m68k/compat_13_sigreturn13.s: revision 1.8
	sys/arch/m68k/m68k/sigreturn.s: file removal
	sys/arch/m68k/include/pte_motorola.h: revision 1.10
	sys/arch/atari/atari/locore.s: revision 1.125
	sys/arch/amiga/amiga/locore.s: revision 1.169
	sys/arch/sun2/sun2/locore.s: revision 1.37
	sys/arch/next68k/next68k/locore.s: revision 1.84
	sys/arch/x68k/x68k/locore.s: revision 1.130
	sys/arch/sun3/sun3x/locore.s: revision 1.77
	sys/arch/cesfic/cesfic/locore.s: revision 1.45
	sys/arch/m68k/conf/files.m68k: revision 1.53
	sys/arch/sun3/sun3/locore.s: revision 1.109
	sys/arch/luna68k/luna68k/locore.s: revision 1.81
	sys/arch/mac68k/mac68k/locore.s: revision 1.182

Define PTE used in the pmap module int terms of the bit definitions
in mmu_{51,40}.h.

Make compat_13_sigreturn13.s and compat_16_sigreturn14.s build as their
own stand-alone files and G/C the now-empty sigreturn.s.

Switch the x68k port to use the same clockframe layout as the other
m68k ports.

Consistently use "intr_depth" as the name of the interrupt depth counter
on m68k platforms.

Make sigcode.s and sunos_sigcode.s build as their own stand-alone files.

Make compat_13_sigreturn13.s and compat_16_sigreturn14.s build as their
own stand-alone files and G/C the now-empty sigreturn.s.

Build m68k/support.s on its own; don't include it from locore.s

Statically-initialize the '851 / '030 protorp with MMU51_SRP_BITS.  In
pmap_init(), re-initialize protorp with MMU51_CRP_BITS.  Remove the now-
redundant code that does this in each of the m68k platforms.

Remove duplicated / slightly-tweaked loadustp() (load user segment table)
routines from all of the m68k ports using the shared pmap.  Instead, in
pmap_init(), set up a function pointer to the appropriate mmu_load_urp*()
function in mmu_subr.s.

x68k: Make _delay() argument to microseconds.
'<< 8' is just a magnification factor and should not be visible
from the outside.

Stop using magic numbers for the MMU root pointer attributes and the
Translation Control register, and also get rid of "#if PGSHIFT == ..."
where those magic numbers are used.

Instead, define new macros: MMU51_SRP_BITS, MMU51_CRP_BITS, MMU51_TCR_BITS,
and MMU40_TCR_BITS, in terms of the definitions in mmu_{40,51}.h.  These
automagically adapt to 8K and 4K pages based on the machine-specific value
of PGSHIFT.

G/C unused ploadw().

loadustp(): Optimize for the overwhelmingly common case of "not the HP MMU".
Rather than converting the level 1 table address to a page number before
calling loadustp() only to have loadustp() convert it back to an address
for the '851, '030, '040, and '060, instead pass the address and convert
to a page number only in the case of the HP MMU.

This is a wash on HP MMU machines (9000/320 and 9000/350), and saves at
least 4 instructions (2x moveq + 2x lsXl) on every context switch on
everything else.

add "#if defined(M68030)" around 68030 specific busaddrerr2030 calls.

Makes M68030 build without 040/060 counterparts enabled for x68k.

s/identifing/identifying/ and s/multipler/multiplier/ in comments.

Sync with HEAD

Sync with HEAD, resolve a few conflicts

Remove compat_svr4 and compat_svr4_32, as discussed on tech-kern@ recently,
but also as discussed several times in the past.

update from HEAD

Sync with HEAD

Add a comment on mnemonic that assembler cannot recognize.

Rebase to HEAD as of a few days ago.

Rebase.

Remove the variable not used anymore.
sync with x68k/pmap_bootstrap.c,v 1.21 (in 2001).

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

Remove obsolete ssir stuff which was used for pre-5.0 softintr(9).

No visible problem on X68030.

Use common m68k/busaddrerr.s for bus error and address error handlers.

No binary changes on GENERIC.
(though the previous revision has not been tested on 040/060 yet)

Sync bus error and address error handlers with other m68k implementation.

Tested on X68030.  Needs tests on 040 and 060turbo
(though it should work as other m68k ports).

The x68k port implemented 68060 support including these vector handlers
as early as amiga back in 1996, but even after amiga's locore.s was
improved several times (updating vectors at runtime to switch handlers
per CPU types etc.), x68k's one has not been updated.
After that, atari and mac68k pulled amiga's implementation,
hp300 pulled mac68k, and then most other m68k ports pulled hp300 ones.

Probably that's the reason why only x68k had different implementations
(i.e. no reason that avoids using common handler implementation),
and now it's time to prepare common arch/m68k/m68k/busaddrerr.s.

Misc cosmetic changes to reduce diffs from other m68k ports.

- replace magic numbers with macro via genassym.cf
- include opt_fpu_emulate.h at the top
- use C-style comments
- add register '%' prefix in comments
- sync several comments
- indent adjustments etc.

No text binary changes. (only .global _KERNEL_OPT_FPU_EMULATE is moved)

defined(LKM) -> defined(MODULAR)

Move the startup routine to the beginning of the source as other m68k ports.

No particular comments on port-x68k@.

Pull up following revision(s) (requested by tsutsui in ticket #1001):
	sys/arch/x68k/x68k/machdep.c: revision 1.187
	sys/arch/x68k/x68k/locore.s: revision 1.111
	sys/arch/x68k/x68k/pmap_bootstrap.c: revision 1.60
Probe extended memories before pmap_boostrap() for actual fix of PR/45915.
Also expand expected maximum extended memory regions to recognize
upto 1008 MB RAM that is supported by the XM6i emulator.
See my post on port-x68k@ for more details:
http://mail-index.NetBSD.org/port-x68k/2013/10/19/msg000039.html
Probably worth to pullup to netbsd-6.

Probe extended memories before pmap_boostrap() for actual fix of PR/45915.

Also expand expected maximum extended memory regions to recognize
upto 1008 MB RAM that is supported by the XM6i emulator.

See my post on port-x68k@ for more details:
http://mail-index.NetBSD.org/port-x68k/2013/10/19/msg000039.html

Probably worth to pullup to netbsd-6.

sync to latest -current.

sync with head.

Fix leftover comment derived from hp300 but not applicable to x68k.

sync to latest -current.

Finally switch PSX16550 fast serial board driver to using MI com(4) driver.
Based on isaki@'s patch and debugged by both isaki@ and tsutsui@.

PSX16550 specific hardware infomation is taken from Human68k's PSXIO driver:
http://retropc.net/x68000/software/hardware/psx16550/

XXX1: TL16C550C seems to have some timing critical issue around THRE interrupt
XXX2: auto hardware flow control of TL16C550 is not implemented in MI com(4)

sync with head

merge to -current.

Merge m68881_save() and m68881_restore() (using most common mvme68k ones).
All functions are checked by my eyes, and all GENERIC kernels compile.

Make sure to call pflusha before (not after) enabling MMU on
68030/68851 initialization paths.

Pointed out by isaki@ per observation of ATC status on XM6i emulator.
Tested on TT030, HP362, NWS-1750, and X68030 by me.

XXX: probably we can remove existing pflusha or TBIA calls after MMU turned
XXX: on (and before enabling cache) but I leave them as is for now to avoid
XXX: unexcpected side effects.

Move spread getsfc() and getdfc() functions into common m68k/support.s.

Note:
- ENTRY_NOPROFILE() is okay since they are used only for debug printf
- they are declared to return int so no need to put a return value into %a0

sync with head

64040 -> 68040 in comment

Make NetBSD/x68k kernel work with 8KB/page (i.e. PGSHIFT==13) settings.

It's quite interesting to check ATC miss rate with both settings on XM6i,
as noted in XM6i presentation by isaki@ at OSC 2011 Hiroshima.

Pull up following revision(s) (requested by tsutsui in ticket #1640):
	sys/arch/x68k/x68k/locore.s: revision 1.102
Defer fpu_probe() call until curlwp and related variables are initialized.
Fixes pre-consinit KASSERT() in trap() caused by fnop instruction in
fpu_probe() on machines without FPU, including XM6i.

Sync with HEAD.

sync with head

It's a bit horrible to call uvm_page_physload() from consinit().
Instead, prepare x68k_init() function for pre-main MD initialization as other
m68k ports and move uvm_page_physload() call and msgbuf initialization there.

Tested on X68030, but options EXTENDED_MEMORY is untested.

Defer fpu_probe() call until curlwp and related variables are initialized.
Fixes pre-consinit KASSERT() in trap() caused by fnop instruction in
fpu_probe() on machines without FPU, including XM6i.

sync with head

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@.

Fix typo (and pasted lines). From OpenBSD.

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.

sync with head.

sync with head

fix PR 6724 - convert m68k options to defflag's.  this means that
M680[12346] are now available from opt_m68k_arch.h.  FPSP meantioned
in the PR has already been fixed, and i could not find any more.

i built these kernels to ensure i did not break their builds:

amiga: GENERIC DRACO
atari: HADES FALCON MILAN-PCIIDE
mac68k: GENERIC
sun2: GENERIC
sun3: GENERIC GENERIC3X
cesfic: attempted GENERIC, does not build due to lack of machine/bus.h
hp300: GENERIC
luna68k: GENERIC
mvme68k: GENERIC
news68k: GENERIC
next68k: GENERIC
x68k: GENERIC

Sync with HEAD.

sync with head

s/cpu_fork/cpu_lwp_fork/ in comment.

Now we have Sysseg_pa value so no need to calculate it from KVA Sysseg.
Tested on hp300.

XXX: mac68k seems to have a different VA vs PA mechanism so I leave it for now.

Move uvm_setpagesize() calls from locore.s to pmap_bootstrap_finalize().
Also explicitly set uvmexp.pagesize to prepare 8KB/page settings.

XXX: There is #ifdef !defined(amiga) && !defined(atari) workaround
XXX: because they have different pmap initialization functions.

Use common pmap_bootstrap_finalize() to initialize lwp0 uarea etc.
Also update some comment.
Compile test only.

Kill proc0paddr.  Use lwp0.l_addr instead.

sync with head.

Sync with HEAD.

Delete 10 years old #if 0'd comments in intio.c, locore.s.
According to the old comment, the interrupt handler via intiotrap
should set his interrupt level again, but it's not right.  And
don't set it again by interrupt hander.

Sync with HEAD.

Fix inverted logic on FPU type check in fpfault().  From OpenBSD.

Remove an old comment (about amiga?).

- Split idepth from INTERRUPT_*REG macros to avoid confusing.
- timertrap: add idepth stuff, and use INTERRUPT_*REG macros.
- lev7intr: add idepth stuff.

Remove extiobase. x68k does not use it.

Make pow(4) a hardware device.
Now pow(4) uses intio_intr_establish() which is a common interrupt
routine, but not powtrap which is a device specific routine.

Move external decl. of intiobase: dev/intiovar.h -> include/cpu.h
Move definition of intiobase: x68k/pmap_bootstrap.c -> x68k/locore.s
These synchronize code with other m68k ports.

Remove intr_reset(), which has disabled device interrupt just
after start in locore.s.  Initializing interrupt should be done
by each device driver.

Sync with wrstuden-revivesa-base-2.

Sync with HEAD.

Sync with head.

Make intio_intr_establish() use evcnt(9),
instead of dynamic allocation of intrnames/intrcnt.

Remove some unused intrnames/intrcnt.

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 w/ NetBSD-4-RC_1

Sync with head.

Sync with head.

Pull up following revision(s) (requested by mhitch in ticket #751):
	sys/arch/x68k/x68k/locore.s: revision 1.80
Ooops - I missed another call to trap.  Fixes PR#36567.

Ooops - I missed another call to trap.  Fixes PR#36567.

Sync with HEAD.

Pull up following revision(s) (requested by mhitch in ticket #728):
	sys/arch/mvme68k/mvme68k/locore.s: revision 1.98
	sys/arch/mac68k/mac68k/trap.c: revision 1.128
	sys/arch/next68k/next68k/locore.s: revision 1.48
	sys/arch/mac68k/mac68k/locore.s: revision 1.152
	sys/arch/sun3/sun3/locore.s: revision 1.88
	sys/arch/sun2/sun2/locore.s: revision 1.19
	sys/arch/sun2/sun2/trap.c: revision 1.32
	sys/arch/m68k/m68k/db_trace.c: revision 1.51
	sys/arch/mvme68k/mvme68k/trap.c: revision 1.90
	sys/arch/news68k/news68k/trap.c: revision 1.53
	sys/arch/luna68k/luna68k/locore.s: revision 1.27
	sys/arch/atari/atari/locore.s: revision 1.99
	sys/arch/sun3/sun3/trap.c: revision 1.130
	sys/arch/x68k/x68k/trap.c: revision 1.89
	sys/arch/next68k/next68k/trap.c: revision 1.67
	sys/arch/x68k/x68k/locore.s: revision 1.79
	sys/arch/news68k/news68k/locore.s: revision 1.43
	sys/arch/luna68k/luna68k/trap.c: revision 1.46
	sys/arch/hp300/hp300/locore.s: revision 1.140
	sys/arch/cesfic/cesfic/locore.s: revision 1.15
	sys/arch/cesfic/cesfic/trap.c: revision 1.35
	sys/arch/m68k/m68k/trap_subr.s: revision 1.12
	sys/arch/amiga/amiga/locore.s: revision 1.143
Pass a frame pointer to trap() rather than the 'entire frame' trick.  Gcc4
was optimizing away modifications to the frame contents (it's not nice to
trick gcc).  Pass the pointer as the first argument to reduce the number
of places that would be changed otherwise.  Fixes the getcwd regression
test on most m68k ports.

Pass a frame pointer to trap() rather than the 'entire frame' trick.  Gcc4
was optimizing away modifications to the frame contents (it's not nice to
trick gcc).  Pass the pointer as the first argument to reduce the number
of places that would be changed otherwise.  Fixes the getcwd regression
test on most m68k ports.

Sync with head.

Update to HEAD.

Adapt to the merge of yamt-idlelwp branch.
tested on my X68030.

Sync with HEAD.

Global ssir (similated software intnerrupt request?) is now declared
in softintr.c so remove it from locore.s.

merge ktrace-lwp.

Sync with HEAD.

Convert -MMU_68040 into a form gas will take now (-- isn't valid)

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD

Centralize identical copies of proc_trampoline code.

(lots more opportunites here for the bored hacker, such as rei and trap0...)

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

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

white-space police

Preserve the symbol table in the LKM || KSYMS cases also.

Use PAGE_SIZE rather than NBPG.

guarantee, not guarentee. Idea from miod@openbsd.

Merge the nathanw_sa branch.

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).

Sync kqueue branch with -current.

Catch up to -current.

It's not called "opt_fpuemulate.h", it's called "opt_fpu_emulate.h".  :)

MD Scheduler Activation bits for X68k.
Compile-tested only.

Catch up with -current.

file locore.s was added on branch nathanw_sa on 2001-11-18 18:44:18 +0000

Embed the version number of the interface between the bootloader and
kernel.  See amiga.

Catch up to -current.

add missing   #include "opt_kgdb.h"

Sync with HEAD (for UBC fixes).

Sync with HEAD.

1. Add register prefix.
2. movb #0x01,0x01800003@ -> movb #0x01,0x01800003 (found by tsutsui).

split m68k SunOS and SVR4-specific sigcode.s code to sunos_sigcode.s
and svr4_sigcode.s respectively
adjust individual m68k port's locore.s to include new sigcode files if
appropriate

Define proper macros for FP frame offsets rather than magic numbers.

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.

Pullup rev.1.61.  Approved by thorpej.
Set fputype earlier, before proc0 initialization.

Set fputype earlier, before proc0 initialization.

Add a lock around the scheduler, and use it as necessary, including
in the non-MULTIPROCESSOR case (LOCKDEBUG requires it).  Scheduler
lock is held upon entry to mi_switch() and cpu_switch(), and
cpu_switch() releases the lock before returning.

Largely from Bill Sommerfeld, with some minor bug fixes and
machine-dependent code hacking from me.

Sync w/ netbsd-1-5-base.

G/C of unused interrupt stubs, and other cleanups.

Add a comment on single-processor systems about p_cpu being initialized
by fork1().

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.

Introduce a new process state distinct from SRUN called SONPROC
which indicates that the process is actually running on a
processor.  Test against SONPROC as appropriate rather than
combinations of SRUN and curproc.  Update all context switch code
to properly set SONPROC when the process becomes the current
process on the CPU.

Wrong logic.  Pointed out by Yasufumi.

defopt FPSP.

MD parts of uvm_pageidlezero.

Pull up revision 1.52 (via patch, requested by itohy):
  Change the implementation of ms(4) polling to use timeout(9)
  software timer, and change the clock interrupt handler not to
  lower interrupt level, in order to eliminate glitches on MPU
  interrupt levels.

- Do not lower interrupt level at clock interrupt.
  The original code lowers level 6 to 4, and if a
  clock interrupt occurs in splzs (or similar) the
  system may be in unpredictable state.
  To do such a hack correctly, checking the original priority
  and duplicated clock interrupts would be required.
  For now, just disable the hack.

- Do not use clock interrupt for ms polling.

Pull up to last week's -current.

bring in latest KAME (as of 19991130, KAME/NetBSD141) into kame branch
just for reference purposes.
This commit includes 1.4 -> 1.4.1 sync for kame branch.

The branch does not compile at all (due to the lack of ALTQ and some other
source code).  Please do not try to modify the branch, this is just for
referenre purposes.

synchronization to latest KAME will take place on HEAD branch soon.

Pull up part of revision 1.51 (via patch, requested by itohy):
  Fix the problem where single-step tracing of a trap instruction
  makes the system fall into kernel debugger.

Sync with -current

Fix the problem that single-step tracing of a trap instruction
drops the system into kernel debugger.

Use m68k common cacheops.c.

Centralize the declaration and clearing of `cold'.

Make use of _C_LABEL and other macros in m68k/asm.h.

Update from trunk.

Make sure the branch target of the delay loop is aligned to a cache
half-line (8-byte) boundary.  Inspired by a discussion w/ Scott Reynolds.

pullup 1.45->1.46 (minoura): Use mvme68k-derived delay() routine

Sync w/ -current.

pullup 1.41->1.42, 1.43->1.44 (minoura)

Use mvme68k-derived delay routine.
Now that we support various models, the old constant-loop delay routine
may cause problems.

pullup 1.44->1.45 (christos); conflicts manually edited

Include opt_compat_sunos.h

Handle fpunimp properly for fpu_emulate.

Add COMPAT_SVR4 for m68k.

Handle F line emulation correctly when FPU_EMULATE is enabled.

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

Merged minoura_x68k_bus_h branch.

Sync.

scsirom driver to probe CZ-6BS1-clone and Mach-2 SCSI host adaptor board
itself.
Modifications to spc and mha drivers.
NOTE: mha is not fully bus.h'fied.

Gather interrupt statics.

x68k specific part of fix for PR 6152

intiotrap priority level change (splhigh -> default).
Handle SPC interrupts via the intiotrap.
XXX: exspc cannot be used until the mha driver is bus.h'fied.

Update uvmexp (cnt for old VM) on intiotrap.

pull up patch to make mouse optional.  Previously it was mandatory
because some mouse-related functions were referenced from other files.
Never committed to trunk because -current uses MI zs driver.  (minoura)

Delete fdctrap routine.

Trivial asm-level optimizations.

Added DMAC driver.

First import of bus_space implementation for x68k port.

Changes to support fork_kthread():
- cpu_set_kpc() now takes void *arg third argument, passed to the
  entry point.
- cpu_fork() allows parent to be non-curproc iff parent is proc0.
  When forking non-curproc, assume its state has already been saved.
- Adjust various pieces of machine-dependent code to account of all of this.

pull up something resembling the changes in rev 1.29, via patch.  (minoura)

Garbage collect trap #1 and trap #2 handlers; they're moved to
trap_subr.s

Pull in opt_compat_netbsd.h

Make device probe/attach sessions to be executed at splhigh.
mha driver used interrupt driven I/O.

Adjust for the new "reaper" kernel thread: do not free the vmspace and
u-area in machine-dependent code.  Instead, call exit2() to schedule
the reaper to free them for us, once it is safe to do so (i.e. we are
no longer running on the dead proc's vmspace and stack).

Cleanup _doboot, fixing the 040 reboot bug.

Switched to MI zs driver.

defopt DDB.

sync with -current after a long silence

Back out the defopt for M680?0. As pointed out to me, this breaks ports which
dont use the M680?0 the way Amiga, Atari, Mac68k, and X68k do. I must have
missed this in the past discussion about this project.

Move M680[2346]0 to opt_m68kcpu.h.
XXX Some explicit dependencies could be removed now from the individual
arch/$ARCH/conf/Makefile.$ARCH files, but this is still to be done.

Fix a bogosity apparently inherited from when the Utah 4.3BSD code base
was converted to use Mach VM for Net2/4.4BSD.  The user segment table
pointer was originally stored in the PCB.  When Mach VM came along,
however, it was also stored in the pmap, and loaded into the PCB in
pmap_activate().  pmap_activate() would then note that the PCB's USTP
was now in sync with the pmap's USTP, and the low-level context switch
code would use the value from the PCB.

However, pmap_activate() would also load the hardware MMU context if
the pmap was the current pmap (or, in the case where pmaps can be shared,
such as in NetBSD, if the proc was the current proc).  The low-level
context switch code would then reload the hardware _again_ using the
USTP from the PCB.

However, the optimization of not calling pmap_activate() if "stchanged"
was false ended up causing some processes to use stale USTP values from
the PCB when the low-level context switch code reloaded the hardware!
This was noticed by using a real vfork(2) (which worked for some time
before failing, surprisingly!)

Since I'm hard pressed to find any real optimization here (since the
hardware was always reloaded once, sometimes twice!), the code now always
calls pmap_activate(), which uses the correct USTP value (the one in the
pmap).  The PCB's USTP is now ignored, and should eventually be g/c'd.

Another optimization can actually be performed, and I have added a comment
describing what it is, but have not yet implemented it.

Also note that most of the loadustp() functions where actually incomplete.
This has been corrected.  These functions should probably be split up into
MMU-specific operations, and called indirectly, rather than doing constant
run-time decision making based on values that will never change during the
course of a boot's lifetime.

- Make pmap_activate() and pmap_deactivate() take a struct proc *.
- Define active_user_pmap() and use it in the appropriate places (from hp300
  port).

add support for MK-HA2 Mach-2 SCSI host adaptor.

Pulldown from marc-pcmcia branch: minimal changes to change x68k port's
"com" (now "xcom") driver to avoid name collision with the more
heaviliy-used "com" driver.

Minimal changes to rename the x68k port's "com" driver to "xcom", to
avoid a namespace collision with the more heavily-used "com" driver,
which needs to be declared in sys/conf/files.

Update marc-pcmcia branch from trunk.

Replace trap1 and trap2 to native 4.3 process.

Use _ASM_LABEL.

Update marc-pcmcia branch from trunk.

Add and use fputype.  Optimize floating point save/restore routines a bit more
if only one CPU type is defined.  Eliminate FPCOPROC.

The recent buserr handler cleanup in  the Amiga locore.s made the label
_buserr point to the 68020/030 buserr code _only_. This has broken access
error handling in the 060 support code.
This is repaired by jumping to _buserr60 from the 060SP, and by providing
a _buserr60 label identical to the _buserr in the unchanged m68k ports
using the 68060.

Eliminate references to vmspace.vm_pmap

Adjust for <m68k/m68k/trap_subr.s>

Use common m68k sigcode.

Use <m68k/m68k/proc_subr.s>

Use <m68k/m68k/support.s>

Garbage-collect extra copypage()

silly little optimization.

bxx --> jxx

first commit of M68060 and FPU_EMULATE support.
M68060 support by YAMASAKI Yasushi, few arranged by me.

CACHE4_OFF --> CACHE40_OFF, compile again.

Fix an inconsistency that came in with Lite: setrq() was renamed to
setrunqueue(), but remrq() was never renamed.  Rename remrq() to
remrunqueue().

Pulled up rev 1.6 by request from oki

Remove gratuitous insn.

Oops, added forgotten "-".  closes port-x68k/2706.

Pulled up from rev 1.5 by request from oki

fixed use of uninitialized pointer.

Pulled up from rev 1.4 by request from Masaru Oki

From Ignatios Souvatzis <is@NetBSD.ORG>:
	properly distinguish between a bus error and an MMU fault
	on systems with 68030 MMU

pull up version 1.3 from the main branch.

fixed reboot problem on Xellent30.

Add a "_kernel_text" symbol, for libkvm.  From Gordon Ross.

Initial revision

NetBSD/x68k, by Masaru Oki.