Messages in this thread | | | Date | 30 Sep 2003 07:38:03 +0200 | Date | Tue, 30 Sep 2003 07:38:03 +0200 | From | Andi Kleen <> | Subject | Re: [PATCH] Athlon Prefetch workaround for 2.6.0test6 |
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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.
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