bt_sg_t
bt_sg_t *sg;
bccb->hccb.data_len = sizeof(bt_sg_t) * nseg;
bt_sg_t *segs;
newcount = (PAGE_SIZE / (BT_NSEG * sizeof(bt_sg_t)));
physaddr += (BT_NSEG * sizeof(bt_sg_t));
bt_sg_t *sg_list;
bt_sg_t* sg_vaddr;