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diff --git a/sys/ddb/db_watch.h b/sys/ddb/db_watch.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990 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 
+ * 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 the
+ * rights to redistribute these changes.
+ */
+/*
+ * HISTORY
+ * $Log: db_watch.h,v $
+ * Revision 1.1  1992/03/25  21:45:40  pace
+ * Initial revision
+ *
+ * Revision 2.3  91/02/05  17:07:31  mrt
+ * 	Changed to new Mach copyright
+ * 	[91/01/31  16:20:09  mrt]
+ * 
+ * Revision 2.2  90/10/25  14:44:21  rwd
+ * 	Generalized the watchpoint support.
+ * 	[90/10/16            rwd]
+ * 	Created.
+ * 	[90/10/16            rpd]
+ * 
+ */
+/*
+ * 	Author: David B. Golub, Carnegie Mellon University
+ *	Date:	10/90
+ */
+
+#ifndef	_DDB_DB_WATCH_
+#define	_DDB_DB_WATCH_
+
+#include <vm/vm_map.h>
+#include <machine/db_machdep.h>
+
+/*
+ * Watchpoint.
+ */
+
+typedef struct db_watchpoint {
+	vm_map_t map;			/* in this map */
+	db_addr_t loaddr;		/* from this address */
+	db_addr_t hiaddr;		/* to this address */
+	struct db_watchpoint *link;	/* link in in-use or free chain */
+} *db_watchpoint_t;
+
+extern boolean_t db_find_watchpoint(/* vm_map_t map, db_addr_t addr,
+				     db_regs_t *regs */);
+extern void db_set_watchpoints();
+extern void db_clear_watchpoints();
+
+extern void db_set_watchpoint(/* vm_map_t map, db_addr_t addr, vm_size_t size */);
+extern void db_delete_watchpoint(/* vm_map_t map, db_addr_t addr */);
+extern void db_list_watchpoints();
+
+#endif	_DDB_DB_WATCH_