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From:	"philippe meynard" <philippe DOT meynard AT vendeeconcept DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: physical adress of int
Date:	Mon, 13 Sep 2004 10:30:04 +0200
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References:	<chrpjm$r73$1 AT s5 DOT feed DOT news DOT oleane DOT net> <4143499b DOT sandmann AT clio DOT rice DOT edu>
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your files from http://clio.rice.edu/djgpp/cwsdma2.zip
are good for my application
Thanks a lot
PM

"Charles Sandmann" <sandmann AT clio DOT rice DOT edu> a écrit dans le message de news:
4143499b DOT sandmann AT clio DOT rice DOT edu...
> > I want to know a physical adress of my int variable, it's for my
ethernet
> > board for his initialisation.
>
> In general under DPMI you can't do this.  However, it depends a lot on
your
> environment.  Frequently the 640KB area is mapped 1:1 - so you can put
> data there suitable for DMA usage.  Since Windows can virtualize the DMA
ports,
> it will even remap requests to the first 640KB, so this technique works
> well in many environments.
>
> If you need larger memory buffers that will not fit in the DOS memory
area,
> and are willing to stick to a single DPMI provider, you can use PMODE
without
> VCPI (which doesn't enable paging) so your virtual address is the same as
> the physical address (you need to add the DS base to it's address).
>
> If you need a more compatible DPMI, you can use CWSDPMI and the files from
> http://clio.rice.edu/djgpp/cwsdma2.zip

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