pte.h revision 1.3.4.1
1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)pte.h 5.5 (Berkeley) 5/9/91 37 * $Id: pte.h,v 1.3.4.1 1993/10/15 13:12:49 mycroft Exp $ 38 */ 39 40 /* 41 * 386 page table entry and page table directory 42 * W.Jolitz, 8/89 43 * 44 * There are two major kinds of pte's: those which have ever existed (and are 45 * thus either now in core or on the swap device), and those which have 46 * never existed, but which will be filled on demand at first reference. 47 * There is a structure describing each. There is also an ancillary 48 * structure used in page clustering. 49 */ 50 51 #ifndef _I386_PTE_H_ 52 #define _I386_PTE_H_ 53 54 #define PDSHIFT 22 /* LOG2(NBPDR) */ 55 #define NBPD (1 << PDSHIFT) /* bytes/page dir */ 56 #define PDOFSET (NBPD-1) /* byte offset into page dir */ 57 #define NPTEPD (NBPD / NBPG) 58 59 #ifndef LOCORE 60 61 struct pde 62 { 63 unsigned int 64 pd_v:1, /* valid bit */ 65 pd_prot:2, /* access control */ 66 pd_mbz1:2, /* reserved, must be zero */ 67 pd_u:1, /* hardware maintained 'used' bit */ 68 :1, /* not used */ 69 pd_mbz2:2, /* reserved, must be zero */ 70 :3, /* reserved for software */ 71 pd_pfnum:20; /* physical page frame number of pte's*/ 72 }; 73 74 struct pte 75 { 76 unsigned int 77 pg_v:1, /* valid bit */ 78 pg_prot:2, /* access control */ 79 pg_mbz1:2, /* reserved, must be zero */ 80 pg_u:1, /* hardware maintained 'used' bit */ 81 pg_m:1, /* hardware maintained modified bit */ 82 pg_mbz2:2, /* reserved, must be zero */ 83 pg_w:1, /* is wired */ 84 :1, /* must write back to swap (unused) */ 85 pg_nc:1, /* 'uncacheable page' bit */ 86 pg_pfnum:20; /* physical page frame number */ 87 }; 88 89 struct hpte 90 { 91 unsigned int 92 pg_high:12, /* special for clustering */ 93 pg_pfnum:20; 94 }; 95 96 struct fpte 97 { 98 unsigned int 99 pg_v:1, /* valid bit */ 100 pg_prot:2, /* access control */ 101 :5, 102 pg_fileno:1, /* file mapped from or TEXT or ZERO */ 103 pg_fod:1, /* is fill on demand (=1) */ 104 pg_blkno:22; /* file system block number */ 105 }; 106 107 typedef struct pde pd_entry_t; /* page directory entry */ 108 typedef struct pte pt_entry_t; /* Mach page table entry */ 109 110 #endif 111 112 #define PD_MASK 0xffc00000 /* page directory address bits */ 113 #define PT_MASK 0x003ff000 /* page table address bits */ 114 115 #define PG_V 0x00000001 116 #define PG_RO 0x00000000 117 #define PG_RW 0x00000002 118 #define PG_u 0x00000004 119 #define PG_PROT 0x00000006 /* all protection bits . */ 120 #define PG_FOD 0x00000200 121 #define PG_SWAPM 0x00000400 122 #define PG_W 0x00000200 123 #define PG_N 0x00000800 /* Non-cacheable */ 124 #define PG_M 0x00000040 125 #define PG_U 0x00000020 /* not currently used */ 126 #define PG_FRAME 0xfffff000 127 128 #define PG_FZERO 0 129 #define PG_FTEXT 1 130 #define PG_FMAX (PG_FTEXT) 131 132 #define PG_NOACC 0 133 #define PG_KR 0x00000000 134 #define PG_KW 0x00000002 135 #define PG_URKR 0x00000004 136 #define PG_URKW 0x00000004 137 #define PG_UW 0x00000006 138 139 /* 140 * Page Protection Exception bits 141 */ 142 143 #define PGEX_P 0x01 /* Protection violation vs. not present */ 144 #define PGEX_W 0x02 /* during a Write cycle */ 145 #define PGEX_U 0x04 /* access from User mode (UPL) */ 146 147 /* 148 * Pte related macros 149 */ 150 #define dirty(pte) ((pte)->pg_m) 151 152 #ifndef LOCORE 153 #ifdef KERNEL 154 /* utilities defined in pmap.c */ 155 extern struct pte *Sysmap; 156 #endif 157 #endif 158 159 #endif /* _I386_PTE_H_ */ 160
Indexes created Mon Oct 27 02:09:54 GMT 2025