Sounds like a good protection mechanism. Any reason this is only needed on i945-nehalem?

On Intel: Sandybridge (the next newer one we supported back then) does that check itself in "hardware" (with the assumption that following chipsets will do as well) while for pre-i945 we didn't have SMM.

AMD/Via: Stuff is sufficiently different that they don't fail the same way.

non-x86: no SMM \o/

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