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    SubjectRe: Multiple MSI, take 3

    There is one idea that seems to model this cleanly
    without breaking all kinds of expectations.

    That is an irq with a very small data payload.

    In that case we wire all of the vectors up to a single
    irq handler that computes the payload as:
    payload = vector - base-vector.

    And then we figure out how to pass that to the handler in irqaction.

    To most of the system it is a single irq so it avoids breaking
    expectations about what an irq is.

    To everything else it is a little odd, and has it's own unique
    set of rules (which is good as well).


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