From:	George Sabolish <sabolish AT slip DOT net>
Newsgroups:	comp.os.msdos.djgpp
Subject:	PCI Device Driver
Date:	9 Jun 1998 00:12:44 GMT
Organization:	Slip.Net (http://www.slip.net)
Lines:	24
Message-ID:	<6lhuls$bfn$1@owl.slip.net>
NNTP-Posting-Host:	slip-3.slip.net
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

I am currently trying to write a PCI card driver using DJGPP
and the CSDPMI server.  I have an existing driver which works
under Windows 3.1/95 using a VxD.  I want to replace the
VxD with some inline ASM.

The Windows driver makes use of SetSelectorBase, and SetSelectorLimit
functions in the Windows API.  I noticed that the DPMI functions
are similar, but I cannot get the code to read from the PCI space.

The Windows driver reads the PCI base address, then uses a
Physical to Linear function to go from the physical address to
a Selector.  Again, the DPMI functions appear similar but do not
seem to work.

The only thing I can find which is different is that the Windows 
program uses the Selector as a far pointer, which DJGPP doesn't
support.  I tried the farpokeb() and farpeekb() functions, without
any luck.

Has anyone else written some PCI card drivers which they might
place on the web?  Or can you point me to some source on the Web?
I haven't had much luck finding anything as of yet.

Mike

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