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interface with 5 methods to mirror the 5 MSI/MSI-X methods in the pcib interface. The pcib driver will need to perform a device specific lookup to find the MSI controller and pass this to intrng as the xref. Intrng will finally find the controller and have it handle the requested operation. Obtained from: ABT Systems Ltd MFH: yes Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D5985