From: Andi Kleen <ak@colin2.muc.de>
To: Jamie Lokier <jamie@shareable.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Athlon Prefetch workaround for 2.6.0test6
Date: 30 Sep 2003 07:38:03 +0200
Date: Tue, 30 Sep 2003 07:38:03 +0200 [thread overview]
Message-ID: <20030930053803.GA75928@colin2.muc.de> (raw)
In-Reply-To: <20030929221346.GA25171@mail.jlokier.co.uk>
On Mon, Sep 29, 2003 at 11:13:46PM +0100, Jamie Lokier wrote:
> Andi Kleen wrote:
> > I guess they should be added to the AMD64 version too. It ignores
> > all bases, but I'm not sure if the CPU catches the case where the linear
> > address computation wraps.
>
> The linear address is _allowed_ to wrap on x86, and there are real
> DOS-era programs which take advantage of this. It is used to create
> the illusion of access to high addresses, by making them wrap to low
> ones which can be mapped.
Only when the A20 gate is set (?), which it never is in Linux.
-Andi
next prev parent reply other threads:[~2003-09-30 5:37 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-29 12:56 [PATCH] Athlon Prefetch workaround for 2.6.0test6 Andi Kleen
2003-09-29 17:03 ` Jamie Lokier
2003-09-29 17:49 ` Andi Kleen
2003-09-29 20:08 ` Jamie Lokier
2003-09-30 5:50 ` Andi Kleen
2003-09-30 9:35 ` Gabriel Paubert
2003-09-29 22:13 ` Jamie Lokier
2003-09-30 5:38 ` Andi Kleen [this message]
2003-09-30 0:19 ` Jamie Lokier
2003-09-29 21:02 ` bill davidsen
2003-09-30 0:50 ` Nick Piggin
2003-09-30 13:27 ` Dave Jones
2003-09-30 15:36 ` Bill Davidsen
[not found] <20030929125629.GA1746@averell.suse.lists.linux.kernel>
[not found] ` <20030929170323.GC21798@mail.jlokier.co.uk.suse.lists.linux.kernel>
[not found] ` <20030929174910.GA90905@colin2.muc.de.suse.lists.linux.kernel>
[not found] ` <20030929200820.GA23444@mail.jlokier.co.uk.suse.lists.linux.kernel>
[not found] ` <20030930093556.GB12970@iram.es.suse.lists.linux.kernel>
2003-09-30 9:50 ` Andi Kleen
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