don't MIPS_PHYS_TO_KSEG1() the hardware address for O2's serial ports
now serial console works again

switch sgimips to common bus_dma and bus_space in arch/mips/
Tested on O2 and Indy.
Things that are compile-tested only for lack of hardware:
- GIO ethernet cards with PCI bridges
- IP2x hardware not found on Indy
- IP1x

branches: 1.43.14;
Adapt to the changed signature of pckbc_cnattach().

branches: 1.42.2; 1.42.12;
#include <sys/bus.h> instead of <machine/bus.h>.

Merge forward matt-nb5-mips64
Adapt to new interrupt/spl framework
Deal with arcbios calls being O32 and kernels being N32/N64.
Need to save/restore T8 across arcbios calls.

branches: 1.40.4; 1.40.6; 1.40.8;
Include sys/device.h. Fix build.

Ansify function definitions w/o arguments. Generated with sed.

Un-hardcode IP32 serial console bus tags. Fixes regression introduced in revision 1.28.

Enable Personal IRIS 4D/20 and 4D/25 support:
- Adapt int(4) to handle the INT1 chip
- Move generic rtc clocks out of hpc/ and into dev/
- Handle the very strangely wired eeprom and other bits in arcemu
- Sprinkle MACH_SGI_IP6 as necessary
- Enable IP6/IP10 devices in GENERIC32_IP12. Yes, the naming is poor but
there's no winning with kernel/hw compatibility on sgimips...

Tested on my 4D/25. Doesn't (appear to) break macallan@'s IP22.

branches: 1.36.36; 1.36.44; 1.36.50;
Enable O2 onboard framebuffer driver.

branches: 1.35.2; 1.35.6; 1.35.8;
Check the return value of gio_cnattach as it can fail despite what the
PROM says we should do.

zskbd is unit 0, not 1.

Add zskbd console attachment.

branches: 1.32.20;
merge ktrace-lwp.

branches: 1.31.2;
Constify

Prepend HPC3 macros universally with "HPC3_" to distinctly recognise
the corresponding revision and maintain consistency with HPC1.

No functional change intended.

Replace the hpc0 base address with the definition from
hpc/hpcregs.h.

Call gio_video_init() for IP12 and IP20. Neither model uses the same keyboard
glue as the IP22, so add conditionals in the keyboard connection logic.

Refactor consinit() for readability by pulling out mach_type
specific code into their own functions. No functional change is
intended.

ok'd by pooka and sekiya

don't attempt to init pckbd console on IP20

Rework conditional statement a bit to print bit about using ARCS for
console I/O if nothing really attached, not if we just called consinit()
with an invalid IPxy mach_type.

inpired by Steve Rumble

attach zs console on IP12

from Steve Rumble

apply wide-angle KNFication beam

branches: 1.22.2;
Completely remove IP2X and IP32, which renders opt_machtype.h obsolete.

Following the example of the hpc/, gio/, and ioc/ directories, move the
mace devices to their own mace/ directory. Alter conf/files.sgimips to
reflect this change in a sane manner (i.e., pull in dev/files.dev and
mace/files.mace when appropriate).

At the same time, allow crime_intr_establish() to fall through to
mace_intr_establish(). mace devices now call cpu_intr_establish().

Nuke two more instances of #ifdef IP32.

Large rototill of the lowlevel code:

* move all device-specific bitbanging to the device drivers in question --
i.e., the ip32 init code doesn't access the CRIME registers directly but
instead trusts the CRIME driver to DTRT. machdep.c is cleaner thereby.
* introduce int.c, which handles the interrupt-controller goo formerly
in ip2x.c.
* unify the CPU interrupt handler, with CRIME, INT2, and the various timer
handlers hooked in via pointers in the platform struct.
* eliminate ip2x.c and ip32.c. After the interrupt handler cleanup, the
actual platform-dependent code was so minimal (rev identification, mask level
initialization) that it made sense to move it into machdep.c
* "#ifdef DEBUG printf("foo"); #endif" becomes aprint_debug.

Tested on my ip22 and ip32. Discussed with pooka@, rafal@.

Clean up console device selection logic.

It's important to use good quality cables when working with SGI serial ports.
Enable zs console for IP20.

Force ARCS console for IP20 until the console-on-zs crashing problem is
fixed. Store the board revision for future use, while we're at it.

iocreg.h has moved.

Change all IP22 preprocessor conditionals to IP2X preprocessor conditionals.

Part one of two -- part two will be renaming ip22_*() to ip2x_*().

Add support for attaching newport/pckbc as console on IP22 (Indy).

XXX Does this work on Indigo2 too?
XXX Ugly hardcoded bus_space_tags and stuff.
XXX This whole file is one damn ugly mess.

Add some delay before calling comcnattach() to wait
previous console output to complete.

Apply a bunch of patches written by Christopher SEKIYA
(with several cosmetic changes by me) which fixes O2 (IP32) support.

Now my R5000 O2 works fine in multiuser with on-board AIC7880 SCSIs
and several PCI network cards (but only on serial console yet).
L2 cache on R5000/Rm5200 is still disabled for now, but it will be
fixed later, hopefully.

See recent discussion on port-sgimips for details.

__KERNEL_RCSID()

branches: 1.9.2;
Also pass a type argument to comcnattach() and com_kgdb_attach().
comspeed() (and thus cominit()) may need this information.

Checkpoint of O2 work by Chris Sekiya and myself. This is the sgimips bit;
still needs some arch/mips support code before it will fully work.

Replace lots of 8x<space> with <tabs> and other miscellaneous indentation
fixes.
Wrap a couple of long lines.
Use <return-type>\n<function name> as per KNF in a few places.

branches: 1.6.2; 1.6.8;
Use sys/dev/arcbios.

Don't use PCLK as the baud rate generator, as the Indy doens't
like that, and it has no effect on the Indigo2.
From Christopher SEKIYA <wileyc@rezrov.net>.

Also, query the "ConsoleOut" ARCS variable (i.e. "what the console
really is") rather than "console" ("what the console is configured
as").

Support for configuring an SCC console. From Rafal K. Boni.

Add `l_poll' to `struct linesw' and provide an xxxpoll() entry point
in each tty driver to indirect through it.

This allows tty line-disciplines to handle poll(2) system calls.

branches: 1.2.2; 1.2.4;
Adapt to new line discipline scheme.

branches: 1.1.4;
Initial commit. Needs work.