where the floppy driver would wedge because a motor-on timeout would
be cancelled by another I/O operation cancelling a motor-off timeout.
From enami tsugutomo <enami@sm.sony.co.jp>.
timeout()/untimeout() API:
- Clients supply callout handle storage, thus eliminating problems of
resource allocation.
- Insertion and removal of callouts is constant time, important as
this facility is used quite a lot in the kernel.
The old timeout()/untimeout() API has been removed from the kernel.
* Improve communication between the `hard' and `soft' interrupt handlers
to better distinguish various interrupt sources.
* Eliminate several race conditions where we would set a time out handler
only after starting the command on the hardware.
* Handle most timeouts by resetting the controller; there isn't much chance
of recovery in any other way. Currently, the exception is a timeout
on I/O, in which case we first try to pulse the controller's TC line
in order to abort the pseudo-dma sequence. Apparently, "normal"
conditions can induce such a timeout when there's no disk in the drive.
* Reduce the formatting gap parameter to 0x54.
* On the obio bus, interpret the `status' attribute.
* Minimize console diagnostic output if the errors we get appear to be
caused by the absence of a disk.
command (unlock for sd and cd) if no other partitions are open, return
EBUSY otherwise. DIOCEJECT will have the old semantic if its argument is not
0. The old ioctl has been renamed to ODIOCEJECT for binary compatibility.
UVM was written by chuck cranor <chuck@maria.wustl.edu>, with some
minor portions derived from the old Mach code. i provided some help
getting swap and paging working, and other bug fixes/ideas. chuck
silvers <chuq@chuq.com> also provided some other fixes.
this is the sparc portion.
this will be KNF'd shortly. :-)
a char *, because that's what was really intended, and because
if the print function modifies the string, various things could become
unhappy (so the string should _not_ be modified).
thorpej