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diff --git a/include/mach/vm_param.h b/include/mach/vm_param.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989,1988,1987 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/vm_param.h
+ *	Author:	Avadis Tevanian, Jr., Michael Wayne Young
+ *	Date:	1985
+ *
+ *	Machine independent virtual memory parameters.
+ *
+ */
+
+#ifndef	_MACH_VM_PARAM_H_
+#define _MACH_VM_PARAM_H_
+
+#include <mach/machine/vm_param.h>
+#include <mach/machine/vm_types.h>
+
+/*
+ *	The machine independent pages are refered to as PAGES.  A page
+ *	is some number of hardware pages, depending on the target machine.
+ *
+ *	All references to the size of a page should be done
+ *	with PAGE_SIZE, PAGE_SHIFT, or PAGE_MASK.
+ *	They may be implemented as either constants or variables,
+ *	depending on more-specific code.
+ *	If they're variables, they had better be initialized
+ *	by the time system-independent code starts getting called.
+ *
+ *	Regardless whether it is implemented with a constant or a variable,
+ *	the PAGE_SIZE is assumed to be a power of two throughout the
+ *	virtual memory system implementation.
+ *
+ *	More-specific code must at least provide PAGE_SHIFT;
+ *	we can calculate the others if necessary.
+ *	(However, if PAGE_SHIFT really refers to a variable,
+ *	PAGE_SIZE and PAGE_MASK should also be variables
+ *	so their values don't have to be constantly recomputed.)
+ */
+#ifndef PAGE_SHIFT
+#error mach/machine/vm_param.h needs to define PAGE_SHIFT.
+#endif
+
+#ifndef PAGE_SIZE
+#define PAGE_SIZE (1 << PAGE_SHIFT)
+#endif
+
+#ifndef PAGE_MASK
+#define PAGE_MASK (PAGE_SIZE-1)
+#endif
+
+/*
+ *	Convert addresses to pages and vice versa.
+ *	No rounding is used.
+ */
+
+#define atop(x)		(((vm_size_t)(x)) >> PAGE_SHIFT)
+#define ptoa(x)		((vm_offset_t)((x) << PAGE_SHIFT))
+
+/*
+ *	Round off or truncate to the nearest page.  These will work
+ *	for either addresses or counts.  (i.e. 1 byte rounds to 1 page
+ *	bytes.
+ */
+
+#define round_page(x)	((vm_offset_t)((((vm_offset_t)(x)) + PAGE_MASK) & ~PAGE_MASK))
+#define trunc_page(x)	((vm_offset_t)(((vm_offset_t)(x)) & ~PAGE_MASK))
+
+/*
+ *	Determine whether an address is page-aligned, or a count is
+ *	an exact page multiple.
+ */
+
+#define	page_aligned(x)	((((vm_offset_t) (x)) & PAGE_MASK) == 0)
+
+#endif	/* _MACH_VM_PARAM_H_ */