Messages in this thread | | | Date | Fri, 04 May 2007 09:13:04 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [RFC PATCH 3/3] boot bzImages under paravirt |
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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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