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    SubjectRe: [RFC PATCH 3/3] boot bzImages under paravirt
    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.

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      Last update: 2007-05-04 18:15    [W:0.022 / U:20.048 seconds]
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