From:	"Wiley Black" <Wiley-Black AT usa DOT net>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Getting Physical Address
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Date:	Sun, 23 Sep 2001 03:25:05 GMT
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Hi all,

I am trying to get the physical address of a
selector, particularly the _my_ds() selector.  I
have used __dpmi_get_segment_base_address() as
well as using __dpmi_get_descriptor() and then
assembled the base address based on my reference
books.  Both give me the same result, a base
address of 0x10000000.  This doesn't seem like the
physical address to me?  Somewhere in the FAQ I
had heard about linear and physical addresses
being different, so I consulted my reference books
again and my understanding is that the linear
address is simply the segment right shifted 4 plus
the offset, in other words, about the same.  Also,
my reference seems to indicate the descriptor has
the physical address anyway.  So, I'm a little
confused, how do I get the physical address of the
selector/descriptor?

Thanks in advance,
Wiley

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