[coyotos-dev] I love Intel

[William Leslie]

Hi!

On Dec 26, 2007 2:44 AM, Jonathan S. Shapiro <shap at eros-os.com> wrote:

> The F00F bug screws this up horribly, because it effectively demands
> that the exception vector table live in a 4K mapping.


Why?

It appears to be purely for convenience above. I don't have a system with
the F00F bug to try it out on, but the point seems to be that the IDT is on
an unmapped, read only or non-cacheable page. If that's a single, large
page, it adds a handful of instructions when you're modifying the IDT
(assuming you use the read-only fix).


William
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