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From: Charles Sandmann <sandmann AT praline DOT no DOT NeoSoft DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: VESA Linear Mode?
Date: Sun, 30 Jul 1995 11:29:58 CDT
Organization: NeoSoft Internet Services +1 713 968 5800
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References: <3ve4h7$9kh AT newshound DOT uidaho DOT edu>
Reply-To: sandmann AT clio DOT rice DOT edu
Nntp-Posting-Host: praline.no.neosoft.com
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Dj-Gateway: from newsgroup comp.os.msdos.djgpp

> Is it possible to get a pointer to the VESA 2.0 linear frame buffer in 
> DJGPP?  When I start up UNIVBE, it says something to the effect that a 
> linear buffer is at 78 megabytes.  Do I just call the DPMI fuction to get 
> the offset of an absolute address, and ask for 78 * 1M?  Or is there 
> something more difficult to do?

You would need to call the map physical function call, find the virtual
address, set up a selector to point to it, then use the farptr functions.
Alternatively, in V2, if supported by your DPMI, you could map the device
into a malloced buffer or use the <sys/nearptr.h> function to access the buffer.