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diff --git a/ipc/ipc_object.h b/ipc/ipc_object.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.
+ */
+/*
+ *	File:	ipc/ipc_object.h
+ *	Author:	Rich Draves
+ *	Date:	1989
+ *
+ *	Definitions for IPC objects, for which tasks have capabilities.
+ */
+
+#ifndef	_IPC_IPC_OBJECT_H_
+#define _IPC_IPC_OBJECT_H_
+
+#include <mach_ipc_compat.h>
+
+#include <mach/kern_return.h>
+#include <mach/message.h>
+#include <kern/lock.h>
+#include <kern/macro_help.h>
+#include <kern/zalloc.h>
+
+typedef unsigned int ipc_object_refs_t;
+typedef unsigned int ipc_object_bits_t;
+typedef unsigned int ipc_object_type_t;
+
+typedef struct ipc_object {
+	decl_simple_lock_data(,io_lock_data)
+	ipc_object_refs_t io_references;
+	ipc_object_bits_t io_bits;
+} *ipc_object_t;
+
+#define	IO_NULL			((ipc_object_t) 0)
+#define	IO_DEAD			((ipc_object_t) -1)
+
+#define	IO_VALID(io)		(((io) != IO_NULL) && ((io) != IO_DEAD))
+
+#define	IO_BITS_KOTYPE		0x0000ffff	/* used by the object */
+#define IO_BITS_OTYPE		0x7fff0000 	/* determines a zone */
+#define	IO_BITS_ACTIVE		0x80000000U	/* is object alive? */
+
+#define	io_active(io)		((int)(io)->io_bits < 0)	/* hack */
+
+#define	io_otype(io)		(((io)->io_bits & IO_BITS_OTYPE) >> 16)
+#define	io_kotype(io)		((io)->io_bits & IO_BITS_KOTYPE)
+
+#define	io_makebits(active, otype, kotype)	\
+	(((active) ? IO_BITS_ACTIVE : 0) | ((otype) << 16) | (kotype))
+
+/*
+ * Object types: ports, port sets, kernel-loaded ports
+ */
+#define	IOT_PORT		0
+#define IOT_PORT_SET		1
+#define IOT_NUMBER		2		/* number of types used */
+
+extern zone_t ipc_object_zones[IOT_NUMBER];
+
+#define	io_alloc(otype)		\
+		((ipc_object_t) zalloc(ipc_object_zones[(otype)]))
+
+#define	io_free(otype, io)	\
+		zfree(ipc_object_zones[(otype)], (vm_offset_t) (io))
+
+#define	io_lock_init(io)	simple_lock_init(&(io)->io_lock_data)
+#define	io_lock(io)		simple_lock(&(io)->io_lock_data)
+#define	io_lock_try(io)		simple_lock_try(&(io)->io_lock_data)
+#define	io_unlock(io)		simple_unlock(&(io)->io_lock_data)
+
+#define io_check_unlock(io) 						\
+MACRO_BEGIN								\
+	ipc_object_refs_t _refs = (io)->io_references;			\
+									\
+	io_unlock(io);							\
+	if (_refs == 0)							\
+		io_free(io_otype(io), io);				\
+MACRO_END
+
+#define	io_reference(io)						\
+MACRO_BEGIN								\
+	(io)->io_references++;						\
+MACRO_END
+
+#define	io_release(io)							\
+MACRO_BEGIN								\
+	(io)->io_references--;						\
+MACRO_END
+
+extern void
+ipc_object_reference(/* ipc_object_t */);
+
+extern void
+ipc_object_release(/* ipc_object_t */);
+
+extern kern_return_t
+ipc_object_translate(/* ipc_space_t, mach_port_t,
+			mach_port_right_t, ipc_object_t * */);
+
+extern kern_return_t
+ipc_object_alloc_dead(/* ipc_space_t, mach_port_t * */);
+
+extern kern_return_t
+ipc_object_alloc_dead_name(/* ipc_space_t, mach_port_t */);
+
+extern kern_return_t
+ipc_object_alloc(/* ipc_space_t, ipc_object_type_t,
+		    mach_port_type_t, mach_port_urefs_t,
+		    mach_port_t *, ipc_object_t * */);
+
+extern kern_return_t
+ipc_object_alloc_name(/* ipc_space_t, ipc_object_type_t,
+			 mach_port_type_t, mach_port_urefs_t,
+			 mach_port_t, ipc_object_t * */);
+
+extern mach_msg_type_name_t
+ipc_object_copyin_type(/* mach_msg_type_name_t */);
+
+extern kern_return_t
+ipc_object_copyin(/* ipc_space_t, mach_port_t,
+		     mach_msg_type_name_t, ipc_object_t * */);
+
+extern void
+ipc_object_copyin_from_kernel(/* ipc_object_t, mach_msg_type_name_t */);
+
+extern void
+ipc_object_destroy(/* ipc_object_t, mach_msg_type_name_t */);
+
+extern kern_return_t
+ipc_object_copyout(/* ipc_space_t, ipc_object_t,
+		      mach_msg_type_name_t, boolean_t, mach_port_t * */);
+
+extern kern_return_t
+ipc_object_copyout_name(/* ipc_space_t, ipc_object_t,
+			   mach_msg_type_name_t, boolean_t, mach_port_t */);
+
+extern void
+ipc_object_copyout_dest(/* ipc_space_t, ipc_object_t,
+			   mach_msg_type_name_t, mach_port_t * */);
+
+extern kern_return_t
+ipc_object_rename(/* ipc_space_t, mach_port_t, mach_port_t */);
+
+#if	MACH_IPC_COMPAT
+
+extern mach_msg_type_name_t
+ipc_object_copyout_type_compat(/* mach_msg_type_name_t */);
+
+extern kern_return_t
+ipc_object_copyin_compat(/* ipc_space_t, mach_port_t,
+			    mach_msg_type_name_t, boolean_t,
+			    ipc_object_t * */);
+
+extern kern_return_t
+ipc_object_copyin_header(/* ipc_space_t, mach_port_t,
+			    ipc_object_t *, mach_msg_type_name_t * */);
+
+extern kern_return_t
+ipc_object_copyout_compat(/* ipc_space_t, ipc_object_t,
+			     mach_msg_type_name_t, mach_port_t * */);
+
+extern kern_return_t
+ipc_object_copyout_name_compat(/* ipc_space_t, ipc_object_t,
+				  mach_msg_type_name_t, mach_port_t */);
+
+#endif	MACH_IPC_COMPAT
+
+extern void
+ipc_object_print(/* ipc_object_t */);
+
+#endif	_IPC_IPC_OBJECT_H_