[REVIEW/TEST] Rewritten floppy driver.
Poul-Henning Kamp
phk at phk.freebsd.dk
Thu Aug 19 06:43:10 PDT 2004
Please review and test this patch:
http://phk.freebsd.dk/patch/fdc.patch
This is a substantial rewrite of the floppy driver to make
it GEOM friendly and MP safe.
It would be very beneficial to get it into 5.3 but that hinges
on it getting a very good shakeout first.
- Ditch the state machine and park a kthread for each controller
and have it service the requests.
- The interrupt handler becomes a simple wakeup() and is now fast
and MPSAFE.
- Eliminate cdevsw{} and make_dev() and use a native GEOM interface
instead.
- Improve bus tag/handling abstraction and read the DIGITAL INPUT
register the right place.
- Implement handling of media change suitable for floppies: Destroy
and recreate the provider if the media changes. Autoprobe on
first open. Refuse write open of read-only devices.
- Add sysctl tunables (debug.fdc.*) for various parameters.
- Add central definition of common formats.
MISSING:
2.88M format (still missing, look for a related XXX comment)
PC98 porting.
PCMCIA (YE ?) floppy testing.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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