ADW_SG_BLOCK
bzero(ccb->sg_block, sizeof(ADW_SG_BLOCK) * ADW_NUM_SG_BLOCK);
void adw_build_sglist(ADW_CCB *, ADW_SCSI_REQ_Q *, ADW_SG_BLOCK *);
adw_build_sglist(ADW_CCB *ccb, ADW_SCSI_REQ_Q *scsiqp, ADW_SG_BLOCK *sg_block)
sg_block_next_addr += sizeof(ADW_SG_BLOCK);
sg_block_physical_addr += sizeof(ADW_SG_BLOCK);
sg_block = (ADW_SG_BLOCK *) sg_block_next_addr; /* virt. addr */
ADW_SG_BLOCK sg_block[ADW_NUM_SG_BLOCK];