sbdmadscr_t
sbdmadscr_t *sbdma_dscrtable; /* base of descriptor table */
ptr = (uintptr_t)kmem_zalloc(d->sbdma_maxdescr * sizeof(sbdmadscr_t) +
d->sbdma_dscrtable = (sbdmadscr_t *)roundup2(ptr, CACHELINESIZE);
sbdmadscr_t *dscp;
d->sbdma_dscrtable_phys) / sizeof(sbdmadscr_t));
d->sbdma_dscrtable_phys) / sizeof(sbdmadscr_t));