From:	"Charles Sandmann" <sandmann AT clio DOT rice DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Q: How can I access to HMA with CWSDPMI ?
Date:	Sat, 6 Sep 1997 11:23:56
Organization:	Aspen Technology, Inc.
Lines:	8
Message-ID:	<34113d4c.sandmann@clio.rice.edu>
References:	<5ulret$c00 AT news DOT u-strasbg DOT fr>
Reply-To:	sandmann AT clio DOT rice DOT edu
NNTP-Posting-Host:	nboal2.dmccorp.com
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

>    so trying simply to get a selector, set the base to 0x1a000 and its 
>    limit to above what I need is not enough.
>    I get a page fault when trying to access this memory.

If VCPI is not used to swap modes, CWSDPMI does not map the HMA memory
in the pagetables.  This is a bug.in paging.c.  As a workaround the
memory can be mapped via the DPMI 0x800 call.  I'll fix it in the next
release.

- Raw text -