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

- Define the DAC enable bit that's present in WSBA3.
- Define symbolic constants for the valid WSM values.

The Tsunami / Typhoon chipsets have a static "monster window" for DMA
that allows for up to 32GB of RAM to be direct-mapped if the PCI device
can issue a 64-bit address (the monster window lives at 0x10000000000).
Enable this window and provide this to the PCI bus as a "dmat64".

branches: 1.8.6; 1.8.8;
Define some additional Cchip registers.

Add tsciic, a driver for the DECchip 21272 Core Logic chipset I2C controller.
Tested on DS20L.

Add support for AlphaStation DS15.

Ported from OpenBSD via PR port-alpha/48148 by nullnilaki.
Note support for the secondary PCI bus still needs more improvements.

branches: 1.5.6; 1.5.10;
Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constification in db_disasm.c

branches: 1.4.8; 1.4.12;
Enable Pchip and Cchip error interrupts (machine checks) on DEC 6600
systems. Add some basic pretty-printing for those errors. Tested on
a DS20.

branches: 1.3.4; 1.3.130; 1.3.150; 1.3.152;
Fix typo. s/extention/extension/

Because of the Cool sign-extension hack we use to access PCI space,
the `get window' method ends up with the wrong physical address to
pass onto userspace (which wants to mmap the space).

Compensate by adding a CHIP_PHYSADDR() macro which un-hacks the address
suitably for mapping with other-than-KSEG.

branches: 1.1.2; 1.1.4; 1.1.6; 1.1.18;
Support for EV6 Tsunami core logic and system type 6600.
This covers most or all of the presently-available 21264 systems.