Re: 2.2.0p7: fix to ioperm() ranges also needed

Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 12 Jan 1999 14:15:11 +0000 (GMT)

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> Chris Evans wrote:
> > P.S. Offtopic. Can someome clarify for me the differences between iopl(1),
> > iopl(2) and iopl(3)? Thank you!
>
> I don't know if iopl(1) and iopl(2) will cause any different behaviour
> in Linux as I believe it's just rings 0 and 3 that are used. However,
> you can interpret the iopl level as the maximum ring number that can use
> io.

A good reference is the intel pentium II documentation set - which you can
grab in pdf from intel.com

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