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diff --git a/chips/serial_defs.h b/chips/serial_defs.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ *	File: serial_defs.h
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	7/91
+ *
+ *	Generic console driver for serial-line based consoles.
+ */
+
+
+/*
+ * Common defs
+ */
+
+extern int	(*console_probe)(), (*console_param)(), (*console_start)(),
+		(*console_putc)(), (*console_getc)(),
+		(*console_pollc)(), (*console_mctl)(), (*console_softCAR)();
+extern		cngetc(), cnmaygetc(), cnputc(), rcputc();
+
+extern struct tty	*console_tty[];
+extern int rcline, cnline;
+extern int	console;
+
+/* Simple one-char-at-a-time scheme */
+extern		cons_simple_tint(), cons_simple_rint();
+
+#define	CONS_ERR_PARITY		0x1000
+#define	CONS_ERR_BREAK		0x2000
+#define	CONS_ERR_OVERRUN	0x4000