Re: 2.6.14: CR4 not needed to be inspected on the 486 anymore?

[Ondrej Zary]

linux-os (Dick Johnson) wrote:
> > No, you won't.  #UD and #GP will not (I hesitate to say never, but other
> > than a processor bug, I believe that is correct) reset the processor.
> > And CR4 is not "undocumented", even on 486.
>
>
> Yes it is. The i486 Programmer's reference manual documents only
> to CR3.

The manual might be older than the newer 486 CPUs.
And don't forget that not every 486 is Intel. There are at least Cyrix, 
AMD and UMC with interesting Am5x86-P75 and Cx5x86 too.

--
Ondrej Zary
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