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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>
+#include <device/io_req.h>
+#include <mach/machine/vm_types.h>
+
+/*
+ * Map for device IO memory.
+ */
+extern vm_map_t		device_io_map;
+
+extern queue_head_t	io_done_list;
+
+kern_return_t	device_read_alloc(io_req_t, vm_size_t);
+kern_return_t	device_write_get(io_req_t, boolean_t *);
+boolean_t	device_write_dealloc(io_req_t);
+void		device_reference(device_t);
+
+boolean_t	ds_notify(mach_msg_header_t *msg);
+boolean_t	ds_open_done(io_req_t);
+boolean_t	ds_read_done(io_req_t);
+boolean_t	ds_write_done(io_req_t);
+
+void		iowait (io_req_t ior);
+
+kern_return_t	device_pager_setup(
+	const mach_device_t	device,
+	int			prot,
+	vm_offset_t		offset,
+	vm_size_t		size,
+	mach_port_t		*pager);
+
+extern void mach_device_init(void);
+extern void dev_lookup_init(void);
+extern void device_pager_init(void);
+extern void io_done_thread(void) __attribute__ ((noreturn));
+
+io_return_t ds_device_write_trap(
+	device_t 	dev,
+	dev_mode_t 	mode,
+	rpc_recnum_t 	recnum,
+	rpc_vm_offset_t 	data,
+	rpc_vm_size_t 	count);
+
+io_return_t ds_device_writev_trap(
+	device_t 	dev,
+	dev_mode_t 	mode,
+	rpc_recnum_t 	recnum,
+	rpc_io_buf_vec_t 	*iovec,
+	rpc_vm_size_t 	count);
+
+#endif	/* DS_ROUTINES_H */