Remove clause 3 and 4 from TNF licenses

merge ktrace-lwp.

nuke trailing whitespace

use _KERNEL_OPT

Pull up the thorpej_scsipi branch to main branch.
This is a completely rewritten scsipi_xfer execution engine, and the
associated changes to HBA drivers. Overview of changes & features:
- All xfers a

Pull up the thorpej_scsipi branch to main branch.
This is a completely rewritten scsipi_xfer execution engine, and the
associated changes to HBA drivers. Overview of changes & features:
- All xfers are queued in the mid-layer, rather than doing so in an
ad-hoc fashion in individual adapter drivers.
- Adapter/channel resource management in the mid-layer, avoids even trying
to start running an xfer if the adapter/channel doesn't have the resources.
- Better communication between the mid-layer and the adapters.
- Asynchronous event notification mechanism from adapter to mid-layer and
peripherals.
- Better peripheral queue management: freeze/thaw, sorted requeueing during
recovery, etc.
- Clean separation of peripherals, adapters, and adapter channels (no more
scsipi_link).
- Kernel thread for each scsipi_channel makes error recovery much easier
(no more dealing with interrupt context when recovering from an error).
- Mid-layer support for tagged queueing: commands can have the tag type
set explicitly, tag IDs are allocated in the mid-layer (thus eliminating
the need to use buggy tag ID allocation schemes in many adapter drivers).
- support for QUEUE FULL and CHECK CONDITION status in mid-layer; the command
will be requeued, or a REQUEST SENSE will be sent as appropriate.

Just before the merge syssrc has been tagged with thorpej_scsipi_beforemerge

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Backout previous change, and rather, remove all protection but the one
actually currently required. Suggested by Charles M. Hannum.

Fix or add protection for mutiple inclusion.

PR/4328: Matthias Scheler: Syntax errors in debug macros.

- Rename PIDEBUG back to SCSIDEBUG, since other files are still
using SCSIDEBUG.
- Don't #undef PIDEBUG unconditionally.

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 at

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.

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revert previous kprintf change

printf -> kprintf, sprintf -> ksprintf

Numerous changes. Many bugs fixed, better autoconfig, a few new features.

Replace dev_unit with device_softc in scsi_link. Change argument to foostart()
to void*.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

If SCSI_DEBUG is on, a structure member wasn't updated from adapter_unit
to scsibus.

Under construction...