Solaris DDI specific (Solaris DDI).

The ddi_idevice_cookie_t structure contains interrupt priority and interrupt vector information for a device. This structure is useful for devices having programmable bus-interrupt levels. ddi_add_intr(9F) assigns values to the ddi_idevice_cookie_t structure members.

u_short	idev_vector;      /* interrupt vector */
ushort_t	idev_priority;    /* interrupt priority */

The idev_vector field contains the interrupt vector number for vectored bus architectures such as VMEbus. The idev_priority field contains the bus interrupt priority level.

ddi_add_intr(9F)

Writing Device Drivers