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diff --git a/kern/mach_param.h b/kern/mach_param.h
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+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989,1988,1987 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/mach_param.h
+ *	Author:	Avadis Tevanian, Jr., Michael Wayne Young
+ *	Date:	1986
+ *
+ *	Mach system sizing parameters
+ *
+ */
+
+#ifndef	_KERN_MACH_PARAM_H_
+#define _KERN_MACH_PARAM_H_
+
+#define THREAD_MAX	1024		/* Max number of threads */
+#define THREAD_CHUNK	64		/* Allocation chunk */
+
+#define TASK_MAX	1024		/* Max number of tasks */
+#define TASK_CHUNK	64		/* Allocation chunk */
+
+#define ACT_MAX		1024		/* Max number of acts */
+#define ACT_CHUNK	64		/* Allocation chunk */
+
+#define ACTPOOL_MAX	1024
+#define ACTPOOL_CHUNK	64
+
+#define PORT_MAX	((TASK_MAX * 3 + THREAD_MAX)	/* kernel */ \
+				+ (THREAD_MAX * 2)	/* user */ \
+				+ 40000)		/* slop for objects */
+					/* Number of ports, system-wide */
+
+#define SET_MAX		(TASK_MAX + THREAD_MAX + 200)
+					/* Max number of port sets */
+
+#define	ITE_MAX		(1 << 16)	/* Max number of splay tree entries */
+
+#define	SPACE_MAX	(TASK_MAX + 5)	/* Max number of IPC spaces */
+
+#define	IMAR_MAX	(1 << 10)	/* Max number of msg-accepted reqs */
+
+#endif	_KERN_MACH_PARAM_H_