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+/* 
+ * Mach Operating System
+ * Copyright (c) 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:	memory_object.h
+ *	Author:	Michael Wayne Young
+ *
+ *	External memory management interface definition.
+ */
+
+#ifndef	_MACH_MEMORY_OBJECT_H_
+#define _MACH_MEMORY_OBJECT_H_
+
+/*
+ *	User-visible types used in the external memory
+ *	management interface:
+ */
+
+#include <mach/port.h>
+
+typedef	mach_port_t	memory_object_t;
+					/* Represents a memory object ... */
+					/*  Used by user programs to specify */
+					/*  the object to map; used by the */
+					/*  kernel to retrieve or store data */
+
+typedef	mach_port_t	memory_object_control_t;
+					/* Provided to a memory manager; ... */
+					/*  used to control a memory object */
+
+typedef	mach_port_t	memory_object_name_t;
+					/* Used to describe the memory ... */
+					/*  object in vm_regions() calls */
+
+typedef	int		memory_object_copy_strategy_t;
+					/* How memory manager handles copy: */
+#define		MEMORY_OBJECT_COPY_NONE		0
+					/* ... No special support */
+#define		MEMORY_OBJECT_COPY_CALL		1
+					/* ... Make call on memory manager */
+#define		MEMORY_OBJECT_COPY_DELAY 	2
+					/* ... Memory manager doesn't ... */
+					/*     change data externally. */
+#define		MEMORY_OBJECT_COPY_TEMPORARY 	3
+					/* ... Memory manager doesn't ... */
+					/*     change data externally, and */
+					/*     doesn't need to see changes. */
+
+typedef	int		memory_object_return_t;
+					/* Which pages to return to manager
+					   this time (lock_request) */
+#define		MEMORY_OBJECT_RETURN_NONE	0
+					/* ... don't return any. */
+#define		MEMORY_OBJECT_RETURN_DIRTY	1
+					/* ... only dirty pages. */
+#define		MEMORY_OBJECT_RETURN_ALL	2
+					/* ... dirty and precious pages. */
+
+#define		MEMORY_OBJECT_NULL	MACH_PORT_NULL
+
+#endif	/* _MACH_MEMORY_OBJECT_H_ */