machdep.c retains the `mainbus' (i.e. sun4/sun4c) bus_dma* versions for now.
Create a DVMA map specifically for 24-bit devices (le,ie), which has a
more room than previous DVMA map which should be reserved for sun4 VME.
Also- to be fair and on review, kern/391 isn't really addressed by
the previous commits. In reviewing, I'm embarassed to find that this
talks about reading at EOT. I'm actually going to claim that this
is 'not a bug' or 'fixed already' in that at the end of media (at the
edge of recorded media), you may continuously open the tape (should
you choose to) issue a read, and zero bytes will transfer- this is a
sufficient EOF indicator.
a now unused variable. Also, remove the restriction against at density
code being greater than the max SCSI 2 density code: 0x80..0xff are the
Vendor Unique codes and most certainly should be allowed. The check for
invalid values should be less than 0 or greater than 255.
Oh- yeah, the previous commit addressed kern/391.
EOM_PENDING. Set up a persistent EARLYWARNING behaviour flag. If
set, EOM behaviour forces a 'short read' to signal logical (as
opposed to physical) end of media. The user application may, of
course, do with this information what it will.
The EARLYWARNING behaviour may be enabled/disabled by a MTIOCTOP
operation. The default action is to not have EARLYWARNING enabled-
but this may be reversed by an option ST_ENABLE_EARLYWARN in
the kernel build.
interrupt context.
[I had some feline debugging help here. I noticed that every time Kem,
our kitty, jumped onto the USB keyboard the machine crashed.]
* attach arguments now directly support multiple register and
interrupt sets.
* address translation (`ranges') has been made bus-specific
* introduce sbus_destroy_attach_arg() to clean up after
attaching an an Sbus device.
