Jeremy Fitzhardinge wrote:
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...
Joy. Apparently the Intel documentation is actually self-inconsistent.
Section 9.9.1, page 9-17 does indeed have the "far jump or call"
injunction, whereas the sample code in section 9.10.1, page 9-27, line
180 does a near jump!
-hpa
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