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()
618 	if (info->xmit.buf) {  in shutdown()
619 		free_page((unsigned long) info->xmit.buf);  in shutdown()
620 		info->xmit.buf = NULL;  in shutdown()
789 	if (!info->xmit.buf)  in rs_put_char()
793 	if (CIRC_SPACE(info->xmit.head,  in rs_put_char()
794 		       info->xmit.tail,  in rs_put_char()
800 	info->xmit.buf[info->xmit.head++] = ch;  in rs_put_char()
801 	info->xmit.head &= SERIAL_XMIT_SIZE-1;  in rs_put_char()
814 	if (info->xmit.head == info->xmit.tail  in rs_flush_chars()
817 	    || !info->xmit.buf)  in rs_flush_chars()
839 	if (!info->xmit.buf)  in rs_write()
844 		c = CIRC_SPACE_TO_END(info->xmit.head,  in rs_write()
845 				      info->xmit.tail,  in rs_write()
852 		memcpy(info->xmit.buf + info->xmit.head, buf, c);  in rs_write()
853 		info->xmit.head = ((info->xmit.head + c) &  in rs_write()
861 	if (info->xmit.head != info->xmit.tail  in rs_write()
883 	return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);  in rs_write_room()
892 	return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);  in rs_chars_in_buffer()
903 	info->xmit.head = info->xmit.tail = 0;  in rs_flush_buffer()