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SubjectRe: 2.6.14: CR4 not needed to be inspected on the 486 anymore?
Maciej W. Rozycki wrote:

>On Mon, 7 Nov 2005, Zachary Amsden wrote:
>
>
>
>>While this is at least no worse in the nested fault case than earlier
>>kernels, I really wish I had one of those weird 486s so I could test the
>>faulting mechanism. It seems the trap handling code has gotten quite
>>
>>
>
> What's so weird about 486s? Besides, for testing it doesn't have to be
>one -- you will get away with a 386, too. I have neither anymore, but
>there are people around still using them.
>
>

Because I hold in my hand "i486 Microprocessor Programmer's Reference
Manual, c 1990", and it has no mention whatsoever of CR4, and all
documentation I had until Friday had either no mention of CR4, or
something to the effect of "new on Pentium, the CR4 register ..." So
I've had to re-adjust my definition of 486, which was weird.

Zach
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