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From: Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Mapping physical->linear
Date: Sat, 11 Nov 1995 10:27:25 CST
Organization: Rice University, Houston, Texas
Lines: 12
References: <47o6ci$fen AT voyager DOT Internex DOT NET>
Reply-To: sandmann AT clio DOT rice DOT edu
Nntp-Posting-Host: clio.rice.edu
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Dj-Gateway: from newsgroup comp.os.msdos.djgpp

> I need to map a region of physical memory into my program's 
> linear address space.  I'm trying to map a video card's graphic's memory so 
> that I can address it with a near (32-bit) pointer.  

A V2 example which shows both far pointer and near pointer access examples
is on ftp.neosoft.com:pub/users/s/sandmann/vbe.zip (2Kb).  The near pointer
code needs the latest patches to V2B3 (ie won't compile without them) to work 
without recomputing the pointer.  

Please, no comments or questions on the code - the sbrk() stuff is still
in development flux so may change.  But this should be enough of an example
to get started.