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/* $NetBSD: pte.h,v 1.8 1995/03/28 18:17:15 jtc Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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.
*
* @(#)pte.h 5.5 (Berkeley) 5/9/91
*/
/*
* 386 page table entry and page table directory
* W.Jolitz, 8/89
*
* There are two major kinds of pte's: those which have ever existed (and are
* thus either now in core or on the swap device), and those which have
* never existed, but which will be filled on demand at first reference.
* There is a structure describing each. There is also an ancillary
* structure used in page clustering.
*/
#ifndef _I386_PTE_H_
#define _I386_PTE_H_
#define PDSHIFT 22 /* LOG2(NBPDR) */
#define NBPD (1 << PDSHIFT) /* bytes/page dir */
#define PDOFSET (NBPD-1) /* byte offset into page dir */
#define NPTEPD (NBPD / NBPG)
#ifndef LOCORE
typedef int pd_entry_t; /* page directory entry */
typedef int pt_entry_t; /* Mach page table entry */
#endif
#define PD_MASK 0xffc00000 /* page directory address bits */
#define PT_MASK 0x003ff000 /* page table address bits */
#define PG_V 0x00000001 /* present */
#define PG_RO 0x00000000 /* read-only by user (and kernel if 486) */
#define PG_RW 0x00000002 /* read-write by user */
#define PG_u 0x00000004 /* accessible by user */
#define PG_PROT 0x00000006 /* all protection bits */
#define PG_N 0x00000018 /* non-cacheable */
#define PG_U 0x00000020 /* has been used */
#define PG_M 0x00000040 /* has been modified */
#define PG_W 0x00000200 /* page is wired */
#define PG_FRAME 0xfffff000 /* page frame mask */
#define PG_FZERO 0
#define PG_FTEXT 1
#define PG_FMAX (PG_FTEXT)
#define PG_NOACC 0
#define PG_KR 0x00000000
#define PG_KW 0x00000002
#define PG_URKR 0x00000004
#define PG_URKW 0x00000004
#define PG_UW 0x00000006
/*
* Page Protection Exception bits
*/
#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) */
#ifndef LOCORE
#ifdef _KERNEL
/* utilities defined in pmap.c */
extern pt_entry_t *Sysmap;
#endif
#endif
#endif /* _I386_PTE_H_ */
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