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diff --git a/libmachdev/dev_hdr.h b/libmachdev/dev_hdr.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
+ */
+
+/*
+ * Mach device emulation definitions (i386at version).
+ *
+ * Copyright (c) 1996 The University of Utah and
+ * the Computer Systems Laboratory at the University of Utah (CSL).
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software is hereby
+ * granted provided that (1) source code retains these copyright, permission,
+ * and disclaimer notices, and (2) redistributions including binaries
+ * reproduce the notices in supporting documentation, and (3) all advertising
+ * materials mentioning features or use of this software display the following
+ * acknowledgement: ``This product includes software developed by the
+ * Computer Systems Laboratory at the University of Utah.''
+ *
+ * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
+ * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
+ * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * CSL requests users of this software to return to csl-dist@cs.utah.edu any
+ * improvements that they make and grant CSL redistribution rights.
+ *
+ *      Author: Shantanu Goel, University of Utah CSL
+ */
+
+#ifndef	_DEVICE_DEV_HDR_H_
+#define	_DEVICE_DEV_HDR_H_
+
+#include <mach.h>
+#include <hurd.h>
+#include <hurd/ports.h>
+#include <cthreads.h>
+
+#include "device_emul.h"
+
+/*
+ * Operations list for major device types.
+ */
+struct dev_ops {
+	char *    	d_name;		/* name for major device */
+	int		(*d_open)();	/* open device */
+	int		(*d_close)();	/* close device */
+	int		(*d_read)();	/* read */
+	int		(*d_write)();	/* write */
+	int		(*d_getstat)();	/* get status/control */
+	int		(*d_setstat)();	/* set status/control */
+	vm_offset_t	(*d_mmap)();	/* map memory */
+	int		(*d_async_in)();/* asynchronous input setup */
+	int		(*d_reset)();	/* reset device */
+	int		(*d_port_death)();
+					/* clean up reply ports */
+	int		d_subdev;	/* number of sub-devices per
+					   unit */
+	int		(*d_dev_info)(); /* driver info for kernel */
+};
+typedef struct dev_ops *dev_ops_t;
+
+/* This structure is associated with each open device port.
+ * The port representing the device points to this structure.  */
+struct emul_device
+{
+    struct device_emulation_ops *emul_ops;
+    void *emul_data;
+};
+
+typedef struct emul_device *emul_device_t;
+
+#define DEVICE_NULL     ((device_t) 0)
+
+/*
+ * Generic device header.  May be allocated with the device,
+ * or built when the device is opened.
+ */
+struct mach_device {
+	struct port_info port;
+	struct emul_device	dev;		/* the real device structure */
+	struct mutex	lock;
+	short		state;		/* state: */
+#define	DEV_STATE_INIT		0	/* not open  */
+#define	DEV_STATE_OPENING	1	/* being opened */
+#define	DEV_STATE_OPEN		2	/* open */
+#define	DEV_STATE_CLOSING	3	/* being closed */
+	short		flag;		/* random flags: */
+#define	D_EXCL_OPEN		0x0001	/* open only once */
+	short		open_count;	/* number of times open */
+	short		io_in_progress;	/* number of IOs in progress */
+	boolean_t	io_wait;	/* someone waiting for IO to finish */
+
+	int		dev_number;	/* device number */
+	int		bsize;		/* replacement for DEV_BSIZE */
+	struct dev_ops	*dev_ops;	/* and operations vector */
+};
+typedef	struct mach_device *mach_device_t;
+#define	MACH_DEVICE_NULL ((mach_device_t)0)
+
+/*
+ * To find and remove device entries
+ */
+mach_device_t	device_lookup(char *);	/* by name */
+
+/*
+ * To find and remove port-to-device mappings
+ */
+void		dev_port_enter(mach_device_t);
+void		dev_port_remove(mach_device_t);
+
+/*
+ * To call a routine on each device
+ */
+boolean_t	dev_map(boolean_t (*)(), mach_port_t);
+
+/*
+ * To lock and unlock state and open-count
+ */
+#define	device_lock(device)	mutex_lock(&(device)->lock)
+#define	device_unlock(device)	mutex_unlock(&(device)->lock)
+
+#endif	/* _DEVICE_DEV_HDR_H_ */