Date: Tue, 22 May 2001 17:34:14 -0700 (PDT) From: SJ <sandejain@rocketmail.com> To: freebsd-questions@freebsd.org Cc: freebsd-hackers@freebsd.org Subject: Device driver questions Message-ID: <20010523003414.51600.qmail@web13405.mail.yahoo.com>
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Hi all,
I am new to writing device drivers...so please excuse
my ignorance.
I have a couple of questions regarding that:
1. "ioconf.c" contains struct config_resource and
config_device definitions for declarations in
"config" file. But I noticed that for some devices
e.g. device atadisk
device atapicd
...
the corresponding lines in ioconf.c are missing??
2. Whats the use of device_ops structure and what does
"ops" stand for?
3. File naming question:
whats the reasoning behind having "bus.h" and
"bus_private.h"....whats the significance of
"private" here.
4. concept behind having devclasses...I know that
devclasses for a particular bus holds devices and
device drivers for that bus. But then whats the
need for defining a devclass for each driver we
write ?
5. Any poniters to literature which explains the
design philosophy and code specific help for device
drivers in freebsd - I am referring to files
kern/subr_bus.c, bus.h, bus_private.h, isa/* etc.
thanks for your help,
SJ
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