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From: Jamie Lokier <jamie@shareable.org>
To: Helge Hafting <helgehaf@aitel.hist.no>
Cc: linux-kernel@vger.kernel.org
Subject: Re: The well-factored 386
Date: Tue, 29 Jul 2003 17:19:51 +0100	[thread overview]
Message-ID: <20030729161951.GA15889@mail.jlokier.co.uk> (raw)
In-Reply-To: <20030729111423.GA5320@hh.idb.hist.no>

Helge Hafting wrote:
> > The one thing that made it on-topic for me was his quiet suggestion
> > that "forreal" mode interrupts are faster, and that it might, perhaps,
> > be possible to modify a Linux kernel to run in that mode - to take
> > advantage of the faster interrupts.
> 
> That would have to be a kernel for very special use.  The "forreal"
> mode has protection turned off.  As far as I know, that
> means any user process can take over the cpu as if
> it was running in kernel mode.

There are quite a few embedded systems where that is ok, especially if
performance is improved.

Also, I am not sure whether paging still works in "forreal" mode.  If
it does, kernel memory could still be protected.  Not well enough for
security, but enough to protect against programming errors.

-- Jamie

  reply	other threads:[~2003-07-29 16:21 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-28 16:02 The well-factored 386 Jack Dennon
2003-07-28 16:32 ` David S. Miller
2003-07-28 16:46   ` Andries Brouwer
2003-07-28 16:55     ` David S. Miller
2003-07-28 19:31       ` Herbert Pötzl
2003-07-28 19:41   ` Jamie Lokier
2003-07-29 11:14     ` Helge Hafting
2003-07-29 16:19       ` Jamie Lokier [this message]
2003-07-30  7:11         ` Helge Hafting
2003-07-30 14:05           ` Jamie Lokier
  -- strict thread matches above, loose matches on Subject: below --
2003-07-29 12:59 John Bradford
2003-07-29 13:32 ` Ville Herva
2003-07-28  8:44 The Well-Factored 386 Rick A. Hohensee
2003-07-28 14:06 ` David S. Miller
2003-07-28 16:36   ` hp
2003-07-28 20:33   ` Rick A. Hohensee
2003-07-28 20:33     ` David S. Miller
2003-07-28 22:27       ` Stephan von Krawczynski
2003-07-28 22:30         ` David S. Miller
2003-07-28 22:58           ` David D. Hagood
2003-07-29 14:32             ` Timothy Miller
2003-07-29 17:21               ` hp
2003-07-29  0:34           ` jw schultz
2003-07-29  1:27             ` Alan Cox
2003-07-29  3:49               ` Larry McVoy
2003-07-29  4:25                 ` Gene Heskett
2003-07-29  4:42                 ` jw schultz
2003-07-29 12:04                 ` Alan Cox
2003-07-29 14:55                 ` Timothy Miller
2003-07-29  8:45           ` hp
2003-07-28 23:11         ` viro
2003-07-29  0:17       ` Brian Raiter

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