H. Peter Anvin wrote:
> In 32-bit mode? Surely you're joking, Mr. Feynman!
>
Right, yes.
> What's worse, reloading segments here might be highly unsafe, if the
> memory previously occupied by the GDT has been overwritten. Keep in
> mind the GDT is touched on a segment *load*, not on a segment *access*;
> in areas such as booting that can be a huge difference.
>
Yep, suits me. I'm happy for the code to assume that at least %cs and
%ds are sane; I guess %ss too. We could copy %ds into %[efg]s if we
want to be sure (since I could imagine a bootloader leaving them in a
less defined state).
But if the gdt could be missing altogether, then, yes, we should not
touch them at all.
J
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