sfxge_mcdi2_ioc_t
ioclen = sizeof (sfxge_mcdi2_ioc_t);
sfxge_mcdi2_ioc_t *smip =
(sfxge_mcdi2_ioc_t *)mp->b_cont->b_rptr;
sfxge_mcdi2_ioc_t *smip);
sfxge_mcdi2_ioctl(sfxge_t *sp, sfxge_mcdi2_ioc_t *smip)