Mikael Pettersson wrote:
> On Sun, 04 Nov 2007 11:41:58 -0800, H. Peter Anvin wrote:
>
>> Mikael Pettersson wrote:
>>
>>> First patch didn't build. Second patch builds and boots Ok.
>>>
>>> So this means the 486 DX4 has a buggy mov to %cr0?
>>>
>>>
>> Apparently.
>>
>
> Maybe not. I had a look in Intel's SDM Vol3, and the
> section "switching to protected mode" specifies that
> a move to %cr0 that sets PE should immediately be
> followed by a far jmp or call.
>
Yes, that's what the spec says. I queried this a few months ago, but
hpa used his convincing voice and said that in practice it isn't
necessary; there are no known cpus which need this, and any that do
would cause other things to break. But I guess now we have the
counter-example...
J
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