pte.h revision 1.7
1/* $NetBSD: pte.h,v 1.7 1994/10/27 04:16:21 cgd Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)pte.h 5.5 (Berkeley) 5/9/91 39 */ 40 41/* 42 * 386 page table entry and page table directory 43 * W.Jolitz, 8/89 44 * 45 * There are two major kinds of pte's: those which have ever existed (and are 46 * thus either now in core or on the swap device), and those which have 47 * never existed, but which will be filled on demand at first reference. 48 * There is a structure describing each. There is also an ancillary 49 * structure used in page clustering. 50 */ 51 52#ifndef _I386_PTE_H_ 53#define _I386_PTE_H_ 54 55#define PDSHIFT 22 /* LOG2(NBPDR) */ 56#define NBPD (1 << PDSHIFT) /* bytes/page dir */ 57#define PDOFSET (NBPD-1) /* byte offset into page dir */ 58#define NPTEPD (NBPD / NBPG) 59 60#ifndef LOCORE 61typedef int pd_entry_t; /* page directory entry */ 62typedef int pt_entry_t; /* Mach page table entry */ 63#endif 64 65#define PD_MASK 0xffc00000 /* page directory address bits */ 66#define PT_MASK 0x003ff000 /* page table address bits */ 67 68#define PG_V 0x00000001 /* present */ 69#define PG_RO 0x00000000 /* read-only by user (and kernel if 486) */ 70#define PG_RW 0x00000002 /* read-write by user */ 71#define PG_u 0x00000004 /* accessible by user */ 72#define PG_PROT 0x00000006 /* all protection bits */ 73#define PG_N 0x00000018 /* non-cacheable */ 74#define PG_U 0x00000020 /* has been used */ 75#define PG_M 0x00000040 /* has been modified */ 76#define PG_W 0x00000200 /* page is wired */ 77#define PG_FRAME 0xfffff000 /* page frame mask */ 78 79#define PG_FZERO 0 80#define PG_FTEXT 1 81#define PG_FMAX (PG_FTEXT) 82 83#define PG_NOACC 0 84#define PG_KR 0x00000000 85#define PG_KW 0x00000002 86#define PG_URKR 0x00000004 87#define PG_URKW 0x00000004 88#define PG_UW 0x00000006 89 90/* 91 * Page Protection Exception bits 92 */ 93#define PGEX_P 0x01 /* Protection violation vs. not present */ 94#define PGEX_W 0x02 /* during a Write cycle */ 95#define PGEX_U 0x04 /* access from User mode (UPL) */ 96 97#ifndef LOCORE 98#ifdef KERNEL 99/* utilities defined in pmap.c */ 100extern pt_entry_t *Sysmap; 101#endif 102#endif 103 104#endif /* _I386_PTE_H_ */ 105