86 	struct circ_buf		xmit;  member
178 	if (info->xmit.head != info->xmit.tail  in rs_start()
179 	    && info->xmit.buf  in rs_start()
311 	if (info->xmit.head == info->xmit.tail  in transmit_chars()
320 	custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;  in transmit_chars()
322 	info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);  in transmit_chars()
325 	if (CIRC_CNT(info->xmit.head,  in transmit_chars()
326 		     info->xmit.tail,  in transmit_chars()
333 	if (info->xmit.head == info->xmit.tail) {  in transmit_chars()
496 	if (info->xmit.buf)  in startup()
499 		info->xmit.buf = (unsigned char *) page;  in startup()
533 	info->xmit.head = info->xmit.tail = 0;  in startup()
580 	if (info->xmit.buf) {  in shutdown()
581 		free_page((unsigned long) info->xmit.buf);  in shutdown()
582 		info->xmit.buf = NULL;  in shutdown()
748 	if (!info->xmit.buf)  in rs_put_char()
752 	if (CIRC_SPACE(info->xmit.head,  in rs_put_char()
753 		       info->xmit.tail,  in rs_put_char()
759 	info->xmit.buf[info->xmit.head++] = ch;  in rs_put_char()
760 	info->xmit.head &= SERIAL_XMIT_SIZE-1;  in rs_put_char()
770 	if (info->xmit.head == info->xmit.tail  in rs_flush_chars()
773 	    || !info->xmit.buf)  in rs_flush_chars()
792 	if (!info->xmit.buf)  in rs_write()
797 		c = CIRC_SPACE_TO_END(info->xmit.head,  in rs_write()
798 				      info->xmit.tail,  in rs_write()
805 		memcpy(info->xmit.buf + info->xmit.head, buf, c);  in rs_write()
806 		info->xmit.head = ((info->xmit.head + c) &  in rs_write()
814 	if (info->xmit.head != info->xmit.tail  in rs_write()
834 	return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);  in rs_write_room()
841 	return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);  in rs_chars_in_buffer()
850 	info->xmit.head = info->xmit.tail = 0;  in rs_flush_buffer()