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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:	vm_param.h
+ *	Author:	Avadis Tevanian, Jr.
+ *	Date:	1985
+ *
+ *	I386 machine dependent virtual memory parameters.
+ *	Most of the declarations are preceeded by I386_ (or i386_)
+ *	which is OK because only I386 specific code will be using
+ *	them.
+ */
+
+#ifndef	_I386_KERNEL_UTIL_VM_PARAM_H_
+#define _I386_KERNEL_UTIL_VM_PARAM_H_
+
+#include <mach/vm_param.h>
+
+
+/* This variable is expected always to contain
+   the kernel virtual address at which physical memory is mapped.
+   It may change as paging is turned on or off.  */
+extern vm_offset_t phys_mem_va;
+
+
+/* Calculate a kernel virtual address from a physical address.  */
+#define phystokv(pa)	((vm_offset_t)(pa) + phys_mem_va)
+
+/* Same, but in reverse.
+   This only works for the region of kernel virtual addresses
+   that directly map physical addresses.  */
+#define kvtophys(va)	((vm_offset_t)(va) - phys_mem_va)
+
+
+/* This variable contains the kernel virtual address
+   corresponding to linear address 0.
+   In the absence of paging,
+   linear addresses are always the same as physical addresses.  */
+#ifndef linear_base_va
+#define linear_base_va phys_mem_va
+#endif
+
+/* Convert between linear and kernel virtual addresses.  */
+#define lintokv(la)	((vm_offset_t)(la) + linear_base_va)
+#define kvtolin(va)	((vm_offset_t)(va) - linear_base_va)
+
+
+/* This variable keeps track of where in physical memory
+   our boot image was loaded.
+   It holds the physical address
+   corresponding to the boot image's virtual address 0.
+   When paging is disabled, this is simply -phys_mem_va.
+   However, when paging is enabled,
+   phys_mem_va points to the place physical memory is mapped into exec space,
+   and has no relationship to where in physical memory the boot image is.
+   Thus, this variable always contains the location of the boot image
+   whether or not paging is enabled.  */
+extern vm_offset_t boot_image_pa;
+
+/* Code segment we originally had when we started in real mode.
+   Always equal to boot_image_pa >> 4.  */
+extern unsigned short real_cs;
+
+
+
+#endif /* _I386_KERNEL_UTIL_VM_PARAM_H_ */