Path: utzoo!mnetor!uunet!husc6!cmcl2!nrl-cmf!ames!ucsd!sdcsvax!ucsdhub!jack!sdsu!turtle
From: turtle@sdsu.UUCP (Andrew Scherpbier)
Newsgroups: comp.unix.xenix
Subject: Xenix 386 device driver questions
Message-ID: <2991@sdsu.UUCP>
Date: 13 Apr 88 17:18:40 GMT
Distribution: na
Organization: San Diego State University, Math/Sciences Dept.
Lines: 19
Keywords: device drivers

I have a Zenith-386 box with a Zenith-449 EGA graphics card running
Xenix 2.2.2
I want to start writing device drivers for xenix, so I typed in the
sample device driver for a Memory-Mapped Video Driver.  However,
when I tried to link it into the kernel, there were two unresolved
externals: _mmudescr and _dscralloc
I need those routines to address physical memory locations.
Is this sample device driver only for 286 boxes?  Does the 386
use different ways of getting absolute memory? (ie: go through the
page tables by hand)  In general, NOW WHAT?
Replies are greatly appreciated!

-Andrew

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~T~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"I sometimes get the feeling that   |  Andrew Scherpbier
 things cannot possibly get worse...|  Computer Science Department
 and sure enough, they do."         |  San Diego State University
	-Don Perkins Jr.            |  ihnp4!jack!sdsu!turtle