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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:	ipc/ipc_port.h
+ *	Author:	Rich Draves
+ *	Date:	1989
+ *
+ *	Implementation specific complement to mach/port.h.
+ */
+
+#ifndef	_IPC_PORT_H_
+#define _IPC_PORT_H_
+
+#include <mach/port.h>
+
+/*
+ *	mach_port_t must be an unsigned type.  Port values
+ *	have two parts, a generation number and an index.
+ *	These macros encapsulate all knowledge of how
+ *	a mach_port_t is layed out.  However, ipc/ipc_entry.c
+ *	implicitly assumes when it uses the splay tree functions
+ *	that the generation number is in the low bits, so that
+ *	names are ordered first by index and then by generation.
+ *
+ *	If the size of generation numbers changes,
+ *	be sure to update IE_BITS_GEN_MASK and friends
+ *	in ipc/ipc_entry.h.
+ */
+
+#if PORT_GENERATIONS
+#define	MACH_PORT_INDEX(name)		((name) >> 8)
+#define	MACH_PORT_GEN(name)		(((name) & 0xff) << 24)
+#define	MACH_PORT_MAKE(index, gen)	(((index) << 8) | ((gen) >> 24))
+#else
+#define	MACH_PORT_INDEX(name)		(name)
+#define	MACH_PORT_GEN(name)		0
+#define	MACH_PORT_MAKE(index, gen)	(index)
+#endif
+
+#define	MACH_PORT_NGEN(name)		MACH_PORT_MAKE(0, MACH_PORT_GEN(name))
+#define	MACH_PORT_MAKEB(index, bits)	MACH_PORT_MAKE(index, IE_BITS_GEN(bits))
+
+/*
+ *	Typedefs for code cleanliness.  These must all have
+ *	the same (unsigned) type as mach_port_t.
+ */
+
+typedef mach_port_t mach_port_index_t;		/* index values */
+typedef mach_port_t mach_port_gen_t;		/* generation numbers */
+
+
+#define	MACH_PORT_UREFS_MAX	((mach_port_urefs_t) ((1 << 16) - 1))
+
+#define	MACH_PORT_UREFS_OVERFLOW(urefs, delta)				\
+		(((delta) > 0) &&					\
+		 ((((urefs) + (delta)) <= (urefs)) ||			\
+		  (((urefs) + (delta)) > MACH_PORT_UREFS_MAX)))
+
+#define	MACH_PORT_UREFS_UNDERFLOW(urefs, delta)				\
+		(((delta) < 0) && (-(delta) > (urefs)))
+
+#endif	/* _IPC_PORT_H_ */