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diff --git a/include/mach_debug/ipc_info.h b/include/mach_debug/ipc_info.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990 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:	mach_debug/ipc_info.h
+ *	Author:	Rich Draves
+ *	Date:	March, 1990
+ *
+ *	Definitions for the IPC debugging interface.
+ */
+
+#ifndef	_MACH_DEBUG_IPC_INFO_H_
+#define _MACH_DEBUG_IPC_INFO_H_
+
+#include <mach/boolean.h>
+#include <mach/port.h>
+#include <mach/machine/vm_types.h>
+
+/*
+ *	Remember to update the mig type definitions
+ *	in mach_debug_types.defs when adding/removing fields.
+ */
+
+
+typedef struct ipc_info_space {
+	natural_t iis_genno_mask;	/* generation number mask */
+	natural_t iis_table_size;	/* size of table */
+	natural_t iis_table_next;	/* next possible size of table */
+	natural_t iis_tree_size;	/* size of tree */
+	natural_t iis_tree_small;	/* # of small entries in tree */
+	natural_t iis_tree_hash;	/* # of hashed entries in tree */
+} ipc_info_space_t;
+
+
+typedef struct ipc_info_name {
+	mach_port_t iin_name;		/* port name, including gen number */
+/*boolean_t*/integer_t iin_collision;	/* collision at this entry? */
+/*boolean_t*/integer_t iin_compat;	/* is this a compat-mode entry? */
+/*boolean_t*/integer_t iin_marequest;	/* extant msg-accepted request? */
+	mach_port_type_t iin_type;	/* straight port type */
+	mach_port_urefs_t iin_urefs;	/* user-references */
+	vm_offset_t iin_object;		/* object pointer */
+	natural_t iin_next;		/* marequest/next in free list */
+	natural_t iin_hash;		/* hash index */
+} ipc_info_name_t;
+
+typedef ipc_info_name_t *ipc_info_name_array_t;
+
+
+typedef struct ipc_info_tree_name {
+	ipc_info_name_t iitn_name;
+	mach_port_t iitn_lchild;	/* name of left child */
+	mach_port_t iitn_rchild;	/* name of right child */
+} ipc_info_tree_name_t;
+
+typedef ipc_info_tree_name_t *ipc_info_tree_name_array_t;
+
+/*
+ *	Type definitions for mach_port_kernel_object.
+ *	By remarkable coincidence, these closely resemble
+ *	the IKOT_* definitions in ipc/ipc_kobject.h.
+ */
+
+#define	IPC_INFO_TYPE_NONE		0
+#define IPC_INFO_TYPE_THREAD		1
+#define	IPC_INFO_TYPE_TASK		2
+#define	IPC_INFO_TYPE_HOST		3
+#define	IPC_INFO_TYPE_HOST_PRIV		4
+#define	IPC_INFO_TYPE_PROCESSOR		5
+#define	IPC_INFO_TYPE_PSET		6
+#define	IPC_INFO_TYPE_PSET_NAME		7
+#define	IPC_INFO_TYPE_PAGER		8
+#define	IPC_INFO_TYPE_PAGING_REQUEST	9
+#define	IPC_INFO_TYPE_DEVICE		10
+#define	IPC_INFO_TYPE_XMM_PAGER		11
+#define IPC_INFO_TYPE_PAGING_NAME	12
+
+#endif	_MACH_DEBUG_IPC_INFO_H_