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There are two additional regions: ctrl and dbmsg. The first is for generic NTB control and memory windows. The second is for doorbells and message registers. This patch also adds a number of related constants for using these registers. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Reviewed-by: Stephen Bates <sbates@raithlin.com> Reviewed-by: Kurt Schwemmer <kurt.schwemmer@microsemi.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>