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diff --git a/kern/ipc_kobject.h b/kern/ipc_kobject.h
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+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University.
+ * Copyright (c) 1993,1994 The University of Utah and
+ * the Computer Systems Laboratory (CSL).
+ * 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, THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF
+ * THIS SOFTWARE IN ITS "AS IS" CONDITION, AND DISCLAIM 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.
+ */
+/*
+ */
+/*
+ *	File:	kern/ipc_kobject.h
+ *	Author:	Rich Draves
+ *	Date:	1989
+ *
+ *	Declarations for letting a port represent a kernel object.
+ */
+
+#include <ipc/ipc_kmsg.h>
+#include <ipc/ipc_types.h>
+
+#ifndef	_KERN_IPC_KOBJECT_H_
+#define _KERN_IPC_KOBJECT_H_
+
+#include <mach/machine/vm_types.h>
+
+typedef vm_offset_t ipc_kobject_t;
+
+#define	IKO_NULL	((ipc_kobject_t) 0)
+
+typedef unsigned int ipc_kobject_type_t;
+
+#define	IKOT_NONE		0
+#define IKOT_THREAD		1
+#define	IKOT_TASK		2
+#define	IKOT_HOST		3
+#define	IKOT_HOST_PRIV		4
+#define	IKOT_PROCESSOR		5
+#define	IKOT_PSET		6
+#define	IKOT_PSET_NAME		7
+#define	IKOT_PAGER		8
+#define	IKOT_PAGING_REQUEST	9
+#define	IKOT_DEVICE		10
+#define	IKOT_XMM_OBJECT		11
+#define	IKOT_XMM_PAGER		12
+#define	IKOT_XMM_KERNEL		13
+#define	IKOT_XMM_REPLY		14
+#define	IKOT_PAGER_TERMINATING	15
+#define IKOT_PAGING_NAME	16
+#define IKOT_HOST_SECURITY	17
+#define	IKOT_LEDGER		18
+#define IKOT_MASTER_DEVICE	19
+#define IKOT_ACT		20
+#define IKOT_SUBSYSTEM		21
+#define IKOT_IO_DONE_QUEUE	22
+#define IKOT_SEMAPHORE		23
+#define IKOT_LOCK_SET		24
+#define IKOT_CLOCK		25
+#define IKOT_CLOCK_CTRL		26
+					/* << new entries here	*/
+#define	IKOT_UNKNOWN		27	/* magic catchall	*/
+#define	IKOT_MAX_TYPE		28	/* # of IKOT_ types	*/
+ /* Please keep ipc/ipc_object.c:ikot_print_array up to date	*/
+
+#define is_ipc_kobject(ikot)	(ikot != IKOT_NONE)
+
+/*
+ *	Define types of kernel objects that use page lists instead
+ *	of entry lists for copyin of out of line memory.
+ */
+
+#define ipc_kobject_vm_page_list(ikot) 			\
+	((ikot == IKOT_PAGING_REQUEST) || (ikot == IKOT_DEVICE))
+
+#define ipc_kobject_vm_page_steal(ikot)	(ikot == IKOT_PAGING_REQUEST)
+
+/* Initialize kernel server dispatch table */
+/* XXX
+extern void mig_init(void);
+*/
+
+/* Dispatch a kernel server function */
+extern ipc_kmsg_t ipc_kobject_server(
+	ipc_kmsg_t	request);
+
+/* Make a port represent a kernel object of the given type */
+extern void ipc_kobject_set(
+	ipc_port_t		port,
+	ipc_kobject_t		kobject,
+	ipc_kobject_type_t	type);
+
+/* Release any kernel object resources associated with a port */
+extern void ipc_kobject_destroy(
+	ipc_port_t		port);
+
+#define	null_conversion(port)	(port)
+
+#endif	/* _KERN_IPC_KOBJECT_H_ */