Convert walnut to use powerpc/ibm4xx/openbios.
No functional changes.

Use ibm40x_machdep.c.

branches: 1.17.66; 1.17.68;
Change IBM4xx to use the common powerpc PIC framework.
Consolidate most ibm4xx initppc function into ibm4xx_init
and Make all IBM4xx use it.
Change explora to use initppc instead of bootstrap.

branches: 1.16.6;
Support PowerPC 405EX/EXr.
1. Add some new source and header files.
(MAL(split) and RGMII(new) relations for EMAC)
2. Create dcr4xx.h. Its moved from dcr405gp.h. Also remove dcr405xx.h.
3. intr.c supports MULTIUIC with virtual-irq. likes to oea.
support 32-virq/128-hwirq.
4. multiple emac support.
5. WALNUT and VIRTEX_* includes arch/powerpc/conf/files.ibm4xx.
6. WALNUT pci uses arch/powerpc/ibm4xx/pci/.

branches: 1.15.10; 1.15.30; 1.15.32;
Since files.wscons et al. are included by ~all ports anyway, include
them in the mi "files" file, and remove include statements from md files.
These shouldn't pull in additional kernel code when not in use, so it
shouldn't do any harm except a risk of namespace collisions which
should be easy to fix.

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: 1.13.12; 1.13.14; 1.13.20;
include files.wsfb

branches: 1.12.4; 1.12.8; 1.12.10;
fix spelling of accommodate; from Zapher.

Conversion of evbppc to generic TODR. ok freza@

branches: 1.10.4; 1.10.6;
Bring ibm4xx interrupt code up to date:

- generic soft interrupts (ie. use powerpc/softintr.c)
- interrupt event counters (using the ones from powerpc/cpu.h:cpu_info
where appropriate)
- cleanup ibm4xx_intr.h, move implementation details to intr.c

Convert all affected evbppc platforms.

OK by simonb@, some points discussed with matt@

branches: 1.9.2; 1.9.10;
The WALNUT port has now grown a dependency of ibm4xx_autoconf.c via
ibm4xx_device_register(), so include that file in the kernel build.

branches: 1.8.2; 1.8.4; 1.8.6;
merge ktrace-lwp.

branches: 1.7.12;
Remove some bogus config goop that should never have been here.

Abstract the interface between pckbc(4), and the pckbd(4) and pms(4)
drivers that attach to it. This allows for other host interface chips
that use the same keyboards and mice, such as the ones in the ARM
IOMD20, ARM7500, and SA-1111. The PC-compatible driver is still
called pckbc(4), and the new abstraction layer is "pckbport", so the
child devices have moved from sys/dev/pckbc to sys/dev/pckbport, which
also contains some code shared between all host controllers. To avoid
incompatibility, pckbdreg.h is still installed in
/usr/include/dev/pckbc.

In theory, this shouldn't cause any behavioural changes in the drivers
concerned. Thy just use rather more function pointers than before. Tested
on i386 and (with a new host driver) acorn32. Compiled on several other
affected architectures.

Include arch/powerpc/ibm4xx/intr.c only if a particular board actually
uses the generic 4xx interrupt implementation.
There are some 4xx boards with entirely different interrupt controllers.

Rename dsrtc to avoid clashing with the MI i2c ds1307 driver.

Switch ibm4xx ports to common powerpc bus_space/bus_dma code.
XXX: Walnut PCI support is broken. This will be addressed shortly.

branches: 1.2.2;
Re-arrange things in evbppc & powerpc to support OEA-based eval boards
in evbppc. OEA-based board(s) to be added later.

branches: 1.1.2;
New umbrella-port for PowerPC-based evaluation boards.

The first board to be included here is the port to the 405GP-based
Walnut evaluation board, which up until now lived in arch/walnut.

arch/walnut will go away soon, once all the remaining walnut-isms
in the tree have been dealt with.