Message-ID:	<329523E0.58D2@gbrmpa.gov.au>
Date:	Fri, 22 Nov 1996 11:54:28 +0800
From:	Leath Muller <leathm AT gbrmpa DOT gov DOT au>
Reply-To:	leathm AT gbrmpa DOT gov DOT au
Organization:	Great Barrier Reef Marine Park Authority
MIME-Version:	1.0
To:	Kevin Baca <kbaca AT skygames DOT com>
CC:	djgpp AT delorie DOT com
Subject:	Re: pentium RDMSR instruction
References:	<571ku3$gf1 AT news2 DOT noc DOT netcom DOT net> <3294F710 DOT 32E6 AT skygames DOT com>

> The real problem (I think) is that these instructions are priveleged
> instructions and therefore can only be executed from a ring 0 process
> (e.g. kernel code).

Yep...
 
> You need a DPMI host that allows your program to run in ring 0.  I'm not
> sure if Windows does this.  I know CWSDPMI does not.  But CWSDPR0 does.
> You should be able to get CWSDPRO.EXE from the same place you got
> CWSDPMI.EXE (I think).

I tried to implement these under Win95, and they just wouldn't do it...
The program crashed about 3 times, and I assumed it was because '95
didn't let you run stuff at ring 0. I then tried it under cwsdpr0 and 
got it to work. :)  Mind you, it crashed the first time under cwsdpr0
as well, and I didn't bother checking after I fixed it under 95...

Leathal.

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