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diff --git a/device/ds_routines.h b/device/ds_routines.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.
+ */
+/*
+ *	Author: David B. Golub, Carnegie Mellon University
+ *	Date: 	8/89
+ *
+ *	Device service utility routines.
+ */
+
+#ifndef	DS_ROUTINES_H
+#define	DS_ROUTINES_H
+
+#include <vm/vm_map.h>
+#include <device/device_types.h>
+
+/*
+ * Map for device IO memory.
+ */
+vm_map_t	device_io_map;
+
+kern_return_t	device_read_alloc();
+kern_return_t	device_write_get();
+boolean_t	device_write_dealloc();
+
+boolean_t	ds_open_done();
+boolean_t	ds_read_done();
+boolean_t	ds_write_done();
+
+#endif	DS_ROUTINES_H