Date:	Tue, 27 Oct 1998 21:06:08 +0200 (IST)
From:	Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender:	eliz AT is
To:	djgpp AT delorie DOT com
Subject:	Re: CWSDPMI Physical Memory Addresses
In-Reply-To:	<3634FD57.7034AA15@giganet.com>
Message-ID:	<Pine.SUN.3.91.981027210547.8711U-100000@is>
MIME-Version:	1.0
Reply-To:	djgpp AT delorie DOT com

On Mon, 26 Oct 1998, Harold Roman 978-461-0402 Ext 223 wrote:

> I am writing a progam that interacts with a card that does DMA and is
> memory mapped. I need to get physical addresses for my data buffers.
> I looked through the archives and found a "back door" described by
> Charles Sandman (posted 9/22/96). This technique uses the "sgdt"
> instruction to find the global descriptor table and the "str"
> instruction to find the current task structure.

Try the advice in section 18.14 of the DJGPP FAQ list (v2/faq211b.zip
from the usual DJGPP sites).  It describes a couple of ways to achieve
this that are much simpler than messing with SGDT.

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