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From: "Roland Zitzke" <NZEONTQYRAHL AT spammotel DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Obtaining the physical address of a pointer using PMODE
Date: Tue, 15 Nov 2005 12:16:27 +0100
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hi,
I read somewhere, that the pmode/dj extender has a fixed mapping of pointers 
to physical memory.
Thus, if I write something like
unsigned char* p = malloc(1024);
how can I obtain the physical location of the data pointed to by p, provided 
that I use pmode?
Background is that I need this to allocate a DMA buffer and I do not 
necessarily need virtual memory in my application.

Thanks and regards
Roland