fix various typos in comments, mainly immediatly/immediately/,
as well shared and recently fixed typos in OpenBSD code by Jonathan Grey.

- Type hygiene.
- Rename ahb_ecb::hashkey to ahb_ecb::ecb_dma_addr, and use that value
rather than recomputing it all the time.

Correct the comment about the INTHIGH bit in the INTDEF register. It
does indeed mean "IRQ signal is active-high", but "else edge" is not
correct; level-triggered EISA interrupt are active-low, and edge-triggered
EISA interrupts are rising-edge, so INTHIGH would in fact mean "edge".

branches: 1.16.106;
Remove clause 3 and 4 from TNF licenses

branches: 1.15.70; 1.15.72; 1.15.74;
merge ktrace-lwp.

Part 1 of a cleanup pass over the SCSI subsystem. The aim is to name
everything "scsi_*", since we really are talking about the SCSI command
set, ATAPI transport not withstanding. Improve the names of many structures,
and prepend "SCSI_" onto all SCSI command opcodes. Place items described
by the SCSI Primary Commands document into scsi_spc.h.

branches: 1.13.2; 1.13.4;
Move a comment to indicate the true "end of hardware supported fields".

Don't use "struct scsi_generic" in a hardware-defined structure. Instead,
use an array of 12 bytes. Check the incoming CDB to see that it will fit,
and print and error and fail the command if it won't.

branches: 1.11.2; 1.11.8;
DMA, not dma nor Dma.

Fix a couple of LP64 problems (long -> int32_t).

branches: 1.9.12; 1.9.22;
Assign my copyrights to TNF.

Name some constants consistently between drivers.

Always map the EISA configuration registers.

Only map the amount of space the device actually occupies.

Part of PR #5279, Martin Musemann.

- Perform all necessary bus_dmamap_sync() operations.
- Greatly simplify allocation and DMA mapping of the mailbox and ccbs.
- Be more robust against resource shortage errors, and report errors better.

Merge scsipi branch in the mainline. This add support for ATAPI devices
(currently only CD-ROM drives on i386). The sys/dev/scsipi system provides 2
busses to which devices can attach (scsibus and atapibus). This needed to
change some include files and structure names in the low level scsi drivers.

branches: 1.3.2; 1.3.4;
Pull thorpej-bus-dma branch into mainline.

branches: 1.2.2; 1.2.10;
Minor changes.

General cleanup, like other drivers.