Messages in this thread | | | Date | Mon, 20 Oct 2008 12:01:25 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [Lguest] lguest: unhandled trap |
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Ian Campbell wrote: > > Wasn't there some concern about BIOSes which don't correctly reserve > their DMI tables? Or don't even have e820 maps? H. Peter once said: > >> It's pretty standard for 0xf0000...0x100000 to be marked RESERVED in >> E820 on real hardware (including the system I'm typing on right now.) >> It is so marked to indicate that hardware cannot be mapped into that >> space. However, you can't rely on this fact -- heck, you can't rely on >> E820 even existing on a real machine. I have specimens of real-life >> machines that go both ways. >
Not only that, but the ACPI spec states explicitly that the ISA magic areas should be handled without relying on E820.
-hpa
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