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From: larsen AT lal DOT cs DOT utah DOT edu (Steve Larsen)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: DPMI question
Date: 18 Sep 1995 21:52:32 GMT
Organization: University of Utah Computer Science Department
Lines: 26
References: <DEt18B DOT HsB AT jade DOT mv DOT net> <4355ve$hj2 AT news DOT mountain DOT net>
Reply-To: larsen AT sunset DOT cs DOT utah DOT edu
Nntp-Posting-Host: lal.cs.utah.edu
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Dj-Gateway: from newsgroup comp.os.msdos.djgpp

grinch AT access DOT mountain DOT net (ShermPendley) wrote:
: >   mat AT ardi DOT com (Mat Hostetter) writes:
: >  >>>>> "Steve" == Steve Larsen <larsen AT sal DOT cs DOT utah DOT edu> writes:

: >      Steve> P.S.  Another quick one.  Today while trying to get this
: >      Steve> working, I was hitting an interesting problem.  I was
: >      Steve> getting a protection fault while loading a segment register
: >      Steve> (es).  Are the segment registers somehow protected while in
: >      Steve> protected mode?
: >  
: >  Yes.  Only load legitimate selector values into segment registers.

: This deserves some elaboration.  Loading an invalid value into a segment
: selector shouldn't cause a GP fault.  Attempting to access a segment
: through a selector which contains an invalid value does cause a fault.

Yeah, that is what I thought.  However, according to the information 
presented at the GPF, it is dying on the instruction that loads the
segment register.  Very strange, I thought.

--
Steve Larsen
larsen AT sunset DOT cs DOT utah DOT edu

	I don't like stuff that sucks!
		B&B