Messages in this thread | | | Subject | Re: Direct access to hardware | Date | Wed, 26 Jul 2000 10:15:38 -0400 | From | Horst von Brand <> |
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James Sutherland <jas88@cam.ac.uk> said: > On 25 Jul 2000, Krzysztof Halasa wrote:
[...]
> > So what does the kernel (can) do to prevent this problem on defective > > pentiums?
> Trap the defective instructions, and implement a replacement instruction > in software.
How so? The kernel doesn't look at each instruction before it is executed... it does clean up _after_ the fact, or arranges so that the bug can be caught when it tries to bite (f00f case). This is _very_ different from exhaustively checking beforehand (as is being adovocated here), and it is done in cases where the fix is cheap (luckily). -- Dr. Horst H. von Brand mailto:vonbrand@inf.utfsm.cl Departamento de Informatica Fono: +56 32 654431 Universidad Tecnica Federico Santa Maria +56 32 654239 Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513
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