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Device driver question (generic device driver)

Device driver question (generic device driver)

Post by Herbert Wenga » Sat, 27 Jul 1996 04:00:00



Hi, I post this for a colleague, who is unable to post here, so please

Herbert
Now his questions:

Hello,
I'm currently involved in writing a generic device driver, that
implements some common functions for other real drivers. My problem is:
How can I make sure that the generic driver is loaded first (before the
real driver modules)? Is there any order besides the order in the
/etc/system-file?
How does the OS loads it's own generic driver-modules?
Is it on demand ?
If yes, how is the "demanding" encoded, and where (Is there a defaults
file for this ? Is it hardcoded or can it be configured?) ?

Any help appreciated!
Thanks in advance for your replies!

Yours,

Christian

_______________________________________________________________________

"Now's the time to impress not suppress your intellect, hold a gun to
 your head, if your mind's dead, blow away the cobweb" TEST DEPT; "bang
 on it" (Metal Edit) CD LEGACY (1990-1993), freud cd 047, efa 75230-2

 
 
 
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1. Device driver calling another device driver.

Hi.

I am having a problem writing a "meta-driver", ie one that is sandwiched
between the kernel and a real device driver. The platform I am using
consists of a Sun IPC, running SunOS 4.1.1.

My problem is that in attempting to use the OPEN(2V) system call from within
the "xxopen" routine of my metadriver (to open another device-driver (which
then opens the device)); OPEN(2V) "fails".

It appears that calling OPEN(2V) from within the kernel requires a different
calling sequence and argument list. Viz-a-viz: instead of a file descriptor
being returned by OPEN(2V), it seems a pointer is returned (which itself is
a pointer to something else).

Is this true? Is the OPEN(2V) syscall different for a process executing in
user address space, compared to the OPEN call executed by a process running
in kernel mode/address space?

If this is true for OPEN, what about CLOSE, READ, WRITE, etc? Unfortunately,
I don't have (easy) access to any Unix (source) code, to verify this.

Thanks in advance for help/advice.

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