From: Pete Zaitcev <zaitcev@redhat.com>
To: Larry McVoy <lm@bitmover.com>
Cc: linux-kernel@vger.kernel.org
Subject: User mode drivers (Honest does not pay here ...)
Date: Tue, 7 Jan 2003 23:19:22 -0500 [thread overview]
Message-ID: <200301080419.h084JMT10615@devserv.devel.redhat.com> (raw)
In-Reply-To: <mailman.1041987068.25081.linux-kernel2news@redhat.com>
> I may be showing my ignorance here (won't be the first time) but this makes
> me wonder if Linux could provide a way to do "user level drivers".
It is a question often asked in comp.os.linux.development.system.
If performance penalties and security problems are no obstacle,
a lot of hardware can be serviced with a user mode driver, except
one that requires interrupts to operate. There is no way to deliver
an interrupt safely to the user mode, because a device specific
deactivation or ack-ing must be performed before interrupts are
enabled (on i386 at least). Other problems can be worked around
with ioperm and friends.
-- Pete
next prev parent reply other threads:[~2003-01-08 4:10 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-04 18:09 Honest does not pay here Adam J. Richter
2003-01-05 22:03 ` Henning P. Schmiedehausen
2003-01-05 22:53 ` David van Hoose
2003-01-05 23:14 ` Henning P. Schmiedehausen
2003-01-06 0:22 ` David van Hoose
2003-01-06 9:31 ` Henning Schmiedehausen
2003-01-06 23:41 ` Matthias Andree
2003-01-06 23:59 ` Andre Hedrick
2003-01-07 0:07 ` Andrew Walrond
2003-01-07 0:51 ` Steven Barnhart
2003-01-07 9:57 ` Henning P. Schmiedehausen
2003-01-07 11:21 ` Alexander Kellett
2003-01-07 23:04 ` Daniel Egger
2003-01-07 1:24 ` Matthias Andree
2003-01-07 10:07 ` Henning P. Schmiedehausen
2003-01-07 12:44 ` Alan Cox
2003-01-12 23:36 ` Matthias Andree
2003-01-07 16:32 ` Bill Davidsen
2003-01-07 17:21 ` Ryan Anderson
2003-01-07 18:33 ` Jesse Pollard
2003-01-07 19:24 ` Bill Davidsen
2003-01-07 20:58 ` Andre Hedrick
2003-01-07 23:09 ` Jesse Pollard
2003-01-08 0:24 ` Andre Hedrick
2003-01-07 23:35 ` Matthias Andree
2003-01-07 23:33 ` Matthias Andree
2003-01-07 14:24 ` Dana Lacoste
2003-01-07 23:28 ` Matthias Andree
2003-01-08 0:24 ` venom
2003-01-08 0:30 ` Larry McVoy
2003-01-08 0:54 ` venom
2003-01-08 1:10 ` Andre Hedrick
2003-01-08 10:08 ` venom
2003-01-08 11:05 ` Andre Hedrick
[not found] ` <Pine.LNX.4.10.10301080249330.421-100000@master.linux-ide.o rg>
2003-01-08 15:25 ` Stephen Satchell
2003-01-08 1:10 ` Matthias Andree
2003-01-08 1:41 ` Alan Cox
2003-01-08 14:59 ` Jesse Pollard
2003-01-10 14:30 ` Pavel Machek
[not found] ` <mailman.1041987068.25081.linux-kernel2news@redhat.com>
2003-01-08 4:19 ` Pete Zaitcev [this message]
2003-01-08 6:17 ` User mode drivers (Honest does not pay here ...) Dmitry A. Fedorov
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