Re: [Xen-devel] [PATCH] [Xen] Check FADT's signature

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 10/8/07 12:36, "Stefan Berger" <stefanb@xxxxxxxxxx> wrote:

> (XEN) (1) Mapped 0xf601f to ff0f601f
> (XEN) Using APIC driver default
> (XEN) IN acpi_parse_fadt.
> (XEN) (2) Mapped 0x3ffcfec0 to fff9bec0, base = 0xfff9b000
> (XEN) ACPI: Invalid FADT signature A__ADR

This ‘A__ADR’ looks remarkably like the middle of another ACPI table. :-)

Perhaps you could scan all physical memory in the range 3ffcd000-3ffd0000, either via /dev/mem in native Linux, or hack some code to map-and-check within Xen, or whatever, and look for that string? It’d be interesting to know:
 a) does it appear at all?
 b) is it at the same offset in a page as we expect the fadt signature to appear (ie., offset 0xec0)?
 c) is it in a page we mapped previously via __acpi_map_table()?

 -- Keir



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