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From: Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Allocating memory....
Date: Thu, 21 Feb 2002 15:50:39 CST
Organization: Rice University, Houston TX
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> ive been trying to allocate a piece of memory so that both teh host itself
> and a pci device reading straight from memory can acces it. 

There is no way to do this which works under all operating systems for
memory which would be in the DJGPP standard address space.

There is a way to get the physical address of a memory block under
CWSDPMI (see http://clio.rice.edu/djgpp/cwsdma2.zip for an example).

Under Windows you could try using DOS memory (which gets virtualized
1:1 mapping) - and this should also work for other DPMI providers.