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diff --git a/include/device/device_types.h b/include/device/device_types.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: 	3/89
+ */
+
+#ifndef	DEVICE_TYPES_H
+#define	DEVICE_TYPES_H
+
+/*
+ * Types for device interface.
+ */
+#include <mach/std_types.h>
+
+#ifdef	MACH_KERNEL
+/*
+ * Get kernel-only type definitions.
+ */
+#include <device/device_types_kernel.h>
+
+#else	/* MACH_KERNEL */
+/*
+ * Device handle.
+ */
+typedef	mach_port_t	device_t;
+
+#endif	/* MACH_KERNEL */
+
+/*
+ * Device name string
+ */
+typedef	char	dev_name_t[128];	/* must match device_types.defs */
+
+/*
+ * Mode for open/read/write
+ */
+typedef unsigned int	dev_mode_t;
+#define	D_READ		0x1		/* read */
+#define	D_WRITE		0x2		/* write */
+#define	D_NODELAY	0x4		/* no delay on open */
+#define	D_NOWAIT	0x8		/* do not wait if data not available */
+
+/*
+ * IO buffer - out-of-line array of characters.
+ */
+typedef char *	io_buf_ptr_t;
+
+/*
+ * IO buffer - in-line array of characters.
+ */
+#define IO_INBAND_MAX (128)		/* must match device_types.defs */
+typedef char 	io_buf_ptr_inband_t[IO_INBAND_MAX];
+
+/*
+ * IO buffer vector - for scatter/gather IO.
+ */
+typedef struct {
+	vm_offset_t	data;
+	vm_size_t	count;
+} io_buf_vec_t;
+
+/*
+ * Record number for random-access devices
+ */
+typedef	unsigned int	recnum_t;
+
+/*
+ * Flavors of set/get statuses
+ */
+typedef unsigned int	dev_flavor_t;
+
+/*
+ * Generic array for get/set status
+ */
+typedef int		*dev_status_t;	/* Variable-length array of integers */
+#define	DEV_STATUS_MAX	(1024)		/* Maximum array size */
+
+typedef int		dev_status_data_t[DEV_STATUS_MAX];
+
+/*
+ * Mandatory get/set status operations
+ */
+
+/* size a device: op code and indexes for returned values */
+#define	DEV_GET_SIZE			0
+#	define	DEV_GET_SIZE_DEVICE_SIZE	0	/* 0 if unknown */
+#	define	DEV_GET_SIZE_RECORD_SIZE	1	/* 1 if sequential */
+#define	DEV_GET_SIZE_COUNT		2
+
+/*
+ * Device error codes
+ */
+typedef	int		io_return_t;
+
+#define	D_IO_QUEUED		(-1)	/* IO queued - do not return result */
+#define	D_SUCCESS		0
+
+#define	D_IO_ERROR		2500	/* hardware IO error */
+#define	D_WOULD_BLOCK		2501	/* would block, but D_NOWAIT set */
+#define	D_NO_SUCH_DEVICE	2502	/* no such device */
+#define	D_ALREADY_OPEN		2503	/* exclusive-use device already open */
+#define	D_DEVICE_DOWN		2504	/* device has been shut down */
+#define	D_INVALID_OPERATION	2505	/* bad operation for device */
+#define	D_INVALID_RECNUM	2506	/* invalid record (block) number */
+#define	D_INVALID_SIZE		2507	/* invalid IO size */
+#define D_NO_MEMORY		2508	/* memory allocation failure */
+#define D_READ_ONLY		2509	/* device cannot be written to */
+
+#endif	DEVICE_TYPES_H