This section adds the following fields to the state structure. See "Software State Structure" for more information.
ddi_iblock_cookie_t high_iblock_cookie; ddi_idevice_cookie_t high_idevice_cookie; kmutex_t high_mu; int softint_running; ddi_iblock_cookie_t low_iblock_cookie; kmutex_t low_mu; ddi_softintr_t id;