96 	struct circ_buf		xmit;  member
216 	if (info->xmit.head != info->xmit.tail  in rs_start()
217 	    && info->xmit.buf  in rs_start()
349 	if (info->xmit.head == info->xmit.tail  in transmit_chars()
358 	custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;  in transmit_chars()
360 	info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);  in transmit_chars()
363 	if (CIRC_CNT(info->xmit.head,  in transmit_chars()
364 		     info->xmit.tail,  in transmit_chars()
371 	if (info->xmit.head == info->xmit.tail) {  in transmit_chars()
534 	if (info->xmit.buf)  in startup()
537 		info->xmit.buf = (unsigned char *) page;  in startup()
571 	info->xmit.head = info->xmit.tail = 0;  in startup()
630 	if (info->xmit.buf) {  in shutdown()
631 		free_page((unsigned long) info->xmit.buf);  in shutdown()
632 		info->xmit.buf = NULL;  in shutdown()
806 	if (!info->xmit.buf)  in rs_put_char()
810 	if (CIRC_SPACE(info->xmit.head,  in rs_put_char()
811 		       info->xmit.tail,  in rs_put_char()
817 	info->xmit.buf[info->xmit.head++] = ch;  in rs_put_char()
818 	info->xmit.head &= SERIAL_XMIT_SIZE-1;  in rs_put_char()
831 	if (info->xmit.head == info->xmit.tail  in rs_flush_chars()
834 	    || !info->xmit.buf)  in rs_flush_chars()
856 	if (!info->xmit.buf)  in rs_write()
861 		c = CIRC_SPACE_TO_END(info->xmit.head,  in rs_write()
862 				      info->xmit.tail,  in rs_write()
869 		memcpy(info->xmit.buf + info->xmit.head, buf, c);  in rs_write()
870 		info->xmit.head = ((info->xmit.head + c) &  in rs_write()
878 	if (info->xmit.head != info->xmit.tail  in rs_write()
900 	return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);  in rs_write_room()
909 	return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);  in rs_chars_in_buffer()
920 	info->xmit.head = info->xmit.tail = 0;  in rs_flush_buffer()