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diff --git a/include/mach/host_info.h b/include/mach/host_info.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1993,1992,1991,1990,1989,1988 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/host_info.h
+ *
+ *	Definitions for host_info call.
+ */
+
+#ifndef	_MACH_HOST_INFO_H_
+#define	_MACH_HOST_INFO_H_
+
+#include <mach/machine.h>
+#include <mach/machine/vm_types.h>
+
+/*
+ *	Generic information structure to allow for expansion.
+ */
+typedef integer_t	*host_info_t;	/* varying array of integers */
+
+#define	HOST_INFO_MAX	(1024)		/* max array size */
+typedef integer_t	host_info_data_t[HOST_INFO_MAX];
+
+#define KERNEL_VERSION_MAX (512)
+typedef char	kernel_version_t[KERNEL_VERSION_MAX];
+
+#define KERNEL_BOOT_INFO_MAX (4096)
+typedef char	kernel_boot_info_t[KERNEL_BOOT_INFO_MAX];
+
+/*
+ *	Currently defined information.
+ */
+#define HOST_BASIC_INFO		1	/* basic info */
+#define HOST_PROCESSOR_SLOTS	2	/* processor slot numbers */
+#define HOST_SCHED_INFO		3	/* scheduling info */
+#define	HOST_LOAD_INFO		4	/* avenrun/mach_factor info */
+
+struct host_basic_info {
+	integer_t	max_cpus;	/* max number of cpus possible */
+	integer_t	avail_cpus;	/* number of cpus now available */
+	vm_size_t	memory_size;	/* size of memory in bytes */
+	cpu_type_t	cpu_type;	/* cpu type */
+	cpu_subtype_t	cpu_subtype;	/* cpu subtype */
+};
+
+typedef	struct host_basic_info	host_basic_info_data_t;
+typedef struct host_basic_info	*host_basic_info_t;
+#define HOST_BASIC_INFO_COUNT \
+		(sizeof(host_basic_info_data_t)/sizeof(integer_t))
+
+struct host_sched_info {
+	integer_t	min_timeout;	/* minimum timeout in milliseconds */
+	integer_t	min_quantum;	/* minimum quantum in milliseconds */
+};
+
+typedef	struct host_sched_info	host_sched_info_data_t;
+typedef struct host_sched_info	*host_sched_info_t;
+#define HOST_SCHED_INFO_COUNT \
+		(sizeof(host_sched_info_data_t)/sizeof(integer_t))
+
+struct host_load_info {
+	integer_t	avenrun[3];	/* scaled by LOAD_SCALE */
+	integer_t	mach_factor[3];	/* scaled by LOAD_SCALE */
+};
+
+typedef struct host_load_info	host_load_info_data_t;
+typedef struct host_load_info	*host_load_info_t;
+#define	HOST_LOAD_INFO_COUNT \
+		(sizeof(host_load_info_data_t)/sizeof(integer_t))
+
+#endif	/* _MACH_HOST_INFO_H_ */