/*
 * Copyright (c) 1991 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department and William Jolitz of UUNET Technologies Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Derived from hp300 version by Mike Hibler, this version by William
 * Jolitz uses a recursive map [a pde points to the page directory] to
 * map the page tables using the pagetables themselves. This is done to
 * reduce the impact on kernel virtual memory for lots of sparse address
 * space, and to reduce the cost of memory to each process.
 *
 *	from: hp300: @(#)pmap.h	7.2 (Berkeley) 12/16/90
 *	from: @(#)pmap.h	7.4 (Berkeley) 5/12/91
 * $FreeBSD: src/sys/i386/include/pmap.h,v 1.65.2.3 2001/10/03 07:15:37 peter Exp $
 * $DragonFly: src/sys/cpu/i386/include/pmap.h,v 1.14 2007/01/14 20:07:11 dillon Exp $
 */

#ifndef _CPU_PMAP_H_
#define	_CPU_PMAP_H_

/*
 * Page-directory and page-table entires follow this format, with a few
 * of the fields not present here and there, depending on a lot of things.
 */
				/* ---- Intel Nomenclature ---- */
#define	PG_V		0x001	/* P	Valid			*/
#define PG_RW		0x002	/* R/W	Read/Write		*/
#define PG_U		0x004	/* U/S  User/Supervisor		*/
#define	PG_NC_PWT	0x008	/* PWT	Write through		*/
#define	PG_NC_PCD	0x010	/* PCD	Cache disable		*/
#define PG_A		0x020	/* A	Accessed		*/
#define	PG_M		0x040	/* D	Dirty			*/
#define	PG_PS		0x080	/* PS	Page size (0=4k,1=4M)	*/
#define	PG_G		0x100	/* G	Global			*/
#define	PG_AVAIL1	0x200	/*    /	Available for system	*/
#define	PG_AVAIL2	0x400	/*   <	programmers use		*/
#define	PG_AVAIL3	0x800	/*    \				*/


/* Our various interpretations of the above */
#define PG_W		PG_AVAIL1	/* "Wired" pseudoflag */
#define	PG_MANAGED	PG_AVAIL2
#define	PG_FRAME	(~((vm_paddr_t)PAGE_MASK))
#define	PG_PROT		(PG_RW|PG_U)	/* all protection bits . */
#define PG_N		(PG_NC_PWT|PG_NC_PCD)	/* Non-cacheable */

/*
 * Page Protection Exception bits, stored in tf_err on a real fault
 * and in tf_xflags on a signal frame or virtual kernel's trap frame.
 * These only apply to T_PAGEFLT faults.
 *
 * PGEX_U is also used internally by the virtual kernel to indicate
 * whether the frame is a userland frame or a supervisor frame.
 */
#define PGEX_P		0x01	/* Protection violation vs. not present */
#define PGEX_W		0x02	/* during a Write cycle */
#define PGEX_U		0x04	/* access from User mode (UPL) */

/*
 * Virtual kernel bits, managed by software.  Stored in tf_xflags.
 *
 * PGEX_FPFAULT - Force the FP unit to generate a T_DNA fault if an
 *		  emulated user process tried to use it.  This bit is
 *		  only used by vmspace_ctl().
 *
 * PGEX_MAILBOX - Set in xflags by signal code to indicate that a mailbox
 *		  signal was pending.  Remerged on signal return.  This
 *		  bit is only used in a signal vector frame.
 */
#define PGEX_MAILBOX	0x40
#define PGEX_FPFAULT	0x80

#endif /* !_CPU_PMAP_H_ */