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From: "Charles Sandmann" <cwsdpmi AT earthlink DOT net>
Newsgroups: comp.os.msdos.djgpp
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Subject: Re: Beta Test:  CWSDPMI r7 - 4GB support
Date: Wed, 7 Aug 2013 21:04:14 -0500
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

>I refer you to DPMI Int 31H Function 0800H again. If Charles would extend 
>that to work with EBX:ECX you could get the physical address of memory.

Not likely to happen, would require major restructuring of some internal 
CWSDPMI code.  The current page table workaround works well, and anything 
else would also be CWSDPMI specific.  Given the very low need for this type 
of usage (a handful of people), not worth programming/debugging effort.

Almost all DOS users have no need for 2GB, much less 4GB.  A few do, but 
even fewer of those need either physical addresses
or more than 4GB.  Nice free operating environments will give you a linear 
64-bit address space.

Fixing bugs with memory layouts including holes will happen first (certain 
hardware), and it's already been sitting in the request list for 9 months.