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    SubjectRe: [RFC 0/4] dynamically allocate arch specific system vectors
    On Thu, Sep 11, 2008 at 01:04:35PM -0700, H. Peter Anvin wrote:
    > Dean Nelson wrote:
    > >
    > >We (SGI) need somewhere around eight vectors.
    > >
    > >There are two kernel modules, sgi-gru and sgi-xp (in drivers/misc), that
    > >each need two vectors. And there's the broadcast assist unit (BAU) that is
    > >involved in tlb shootdown on uv, which currently uses statically reserved
    > >vector 0xf8 (UV_BAU_MESSAGE -- see uv_bau_init()). I know of a debugger
    > >that
    > >also uses 0xf8 because it was previously available until UV_BAU_MESSAGE
    > >came
    > >along. The BAU would be happy with a dynamically allocated system vector.
    > >We have a couple of other things in the works that also need vectors.
    > >
    > >All of these eight or so vectors are only meaningful on SGI uv systems.
    > >
    > Are these kernel-internal vectors, or exposed to userspace (i.e. the INT
    > instruction works in userspace)? From what I'm gathering, I think this
    > is the former.

    Yeah, these are kernel-internal vectors and are not exposed to userspace.

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