pte.h revision 1.4.2.2
1 1.4.2.2 mycroft /*- 2 1.4.2.2 mycroft * Copyright (c) 1990 The Regents of the University of California. 3 1.4.2.2 mycroft * All rights reserved. 4 1.4.2.2 mycroft * 5 1.4.2.2 mycroft * This code is derived from software contributed to Berkeley by 6 1.4.2.2 mycroft * William Jolitz. 7 1.4.2.2 mycroft * 8 1.4.2.2 mycroft * Redistribution and use in source and binary forms, with or without 9 1.4.2.2 mycroft * modification, are permitted provided that the following conditions 10 1.4.2.2 mycroft * are met: 11 1.4.2.2 mycroft * 1. Redistributions of source code must retain the above copyright 12 1.4.2.2 mycroft * notice, this list of conditions and the following disclaimer. 13 1.4.2.2 mycroft * 2. Redistributions in binary form must reproduce the above copyright 14 1.4.2.2 mycroft * notice, this list of conditions and the following disclaimer in the 15 1.4.2.2 mycroft * documentation and/or other materials provided with the distribution. 16 1.4.2.2 mycroft * 3. All advertising materials mentioning features or use of this software 17 1.4.2.2 mycroft * must display the following acknowledgement: 18 1.4.2.2 mycroft * This product includes software developed by the University of 19 1.4.2.2 mycroft * California, Berkeley and its contributors. 20 1.4.2.2 mycroft * 4. Neither the name of the University nor the names of its contributors 21 1.4.2.2 mycroft * may be used to endorse or promote products derived from this software 22 1.4.2.2 mycroft * without specific prior written permission. 23 1.4.2.2 mycroft * 24 1.4.2.2 mycroft * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 1.4.2.2 mycroft * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 1.4.2.2 mycroft * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 1.4.2.2 mycroft * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 1.4.2.2 mycroft * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 1.4.2.2 mycroft * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 1.4.2.2 mycroft * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 1.4.2.2 mycroft * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 1.4.2.2 mycroft * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 1.4.2.2 mycroft * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 1.4.2.2 mycroft * SUCH DAMAGE. 35 1.4.2.2 mycroft * 36 1.4.2.2 mycroft * from: @(#)pte.h 5.5 (Berkeley) 5/9/91 37 1.4.2.2 mycroft * $Id: pte.h,v 1.4.2.2 1993/12/14 05:31:41 mycroft Exp $ 38 1.4.2.2 mycroft */ 39 1.4.2.2 mycroft 40 1.4.2.2 mycroft /* 41 1.4.2.2 mycroft * 386 page table entry and page table directory 42 1.4.2.2 mycroft * W.Jolitz, 8/89 43 1.4.2.2 mycroft * 44 1.4.2.2 mycroft * There are two major kinds of pte's: those which have ever existed (and are 45 1.4.2.2 mycroft * thus either now in core or on the swap device), and those which have 46 1.4.2.2 mycroft * never existed, but which will be filled on demand at first reference. 47 1.4.2.2 mycroft * There is a structure describing each. There is also an ancillary 48 1.4.2.2 mycroft * structure used in page clustering. 49 1.4.2.2 mycroft */ 50 1.4.2.2 mycroft 51 1.4.2.2 mycroft #ifndef _I386_PTE_H_ 52 1.4.2.2 mycroft #define _I386_PTE_H_ 53 1.4.2.2 mycroft 54 1.4.2.2 mycroft #define PDSHIFT 22 /* LOG2(NBPDR) */ 55 1.4.2.2 mycroft #define NBPD (1 << PDSHIFT) /* bytes/page dir */ 56 1.4.2.2 mycroft #define PDOFSET (NBPD-1) /* byte offset into page dir */ 57 1.4.2.2 mycroft #define NPTEPD (NBPD / NBPG) 58 1.4.2.2 mycroft 59 1.4.2.2 mycroft #ifndef LOCORE 60 1.4.2.2 mycroft 61 1.4.2.2 mycroft struct pde { 62 1.4.2.2 mycroft unsigned int 63 1.4.2.2 mycroft pd_v:1, /* valid bit */ 64 1.4.2.2 mycroft pd_prot:2, /* access control */ 65 1.4.2.2 mycroft pg_nc:2, /* cache disable and write-through */ 66 1.4.2.2 mycroft pd_u:1, /* hardware maintained 'used' bit */ 67 1.4.2.2 mycroft pd_mbz:3, /* reserved, must be zero */ 68 1.4.2.2 mycroft pg_w:1, /* is wired */ 69 1.4.2.2 mycroft :2, /* reserved for software */ 70 1.4.2.2 mycroft pd_pfnum:20; /* physical page frame number of pte's*/ 71 1.4.2.2 mycroft }; 72 1.4.2.2 mycroft 73 1.4.2.2 mycroft struct pte { 74 1.4.2.2 mycroft unsigned int 75 1.4.2.2 mycroft pg_v:1, /* valid bit */ 76 1.4.2.2 mycroft pg_prot:2, /* access control */ 77 1.4.2.2 mycroft pg_nc:2, /* cache disable and write-through */ 78 1.4.2.2 mycroft pg_u:1, /* hardware maintained 'used' bit */ 79 1.4.2.2 mycroft pg_m:1, /* hardware maintained modified bit */ 80 1.4.2.2 mycroft pg_mbz:2, /* reserved, must be zero */ 81 1.4.2.2 mycroft pg_w:1, /* is wired */ 82 1.4.2.2 mycroft :2, /* must write back to swap (unused) */ 83 1.4.2.2 mycroft pg_pfnum:20; /* physical page frame number */ 84 1.4.2.2 mycroft }; 85 1.4.2.2 mycroft 86 1.4.2.2 mycroft typedef struct pde pd_entry_t; /* page directory entry */ 87 1.4.2.2 mycroft typedef struct pte pt_entry_t; /* Mach page table entry */ 88 1.4.2.2 mycroft 89 1.4.2.2 mycroft #endif 90 1.4.2.2 mycroft 91 1.4.2.2 mycroft #define PD_MASK 0xffc00000 /* page directory address bits */ 92 1.4.2.2 mycroft #define PT_MASK 0x003ff000 /* page table address bits */ 93 1.4.2.2 mycroft 94 1.4.2.2 mycroft #define PG_V 0x00000001 /* present */ 95 1.4.2.2 mycroft #define PG_RO 0x00000000 /* read-only by user (and kernel if 486) */ 96 1.4.2.2 mycroft #define PG_RW 0x00000002 /* read-write by user */ 97 1.4.2.2 mycroft #define PG_u 0x00000004 /* accessible by user */ 98 1.4.2.2 mycroft #define PG_PROT 0x00000006 /* all protection bits */ 99 1.4.2.2 mycroft #define PG_N 0x00000018 /* non-cacheable */ 100 1.4.2.2 mycroft #define PG_U 0x00000020 /* has been used */ 101 1.4.2.2 mycroft #define PG_M 0x00000040 /* has been modified */ 102 1.4.2.2 mycroft #define PG_W 0x00000200 /* page is wired */ 103 1.4.2.2 mycroft #define PG_FRAME 0xfffff000 /* page frame mask */ 104 1.4.2.2 mycroft 105 1.4.2.2 mycroft #define PG_FZERO 0 106 1.4.2.2 mycroft #define PG_FTEXT 1 107 1.4.2.2 mycroft #define PG_FMAX (PG_FTEXT) 108 1.4.2.2 mycroft 109 1.4.2.2 mycroft #define PG_NOACC 0 110 1.4.2.2 mycroft #define PG_KR 0x00000000 111 1.4.2.2 mycroft #define PG_KW 0x00000002 112 1.4.2.2 mycroft #define PG_URKR 0x00000004 113 1.4.2.2 mycroft #define PG_URKW 0x00000004 114 1.4.2.2 mycroft #define PG_UW 0x00000006 115 1.4.2.2 mycroft 116 1.4.2.2 mycroft /* 117 1.4.2.2 mycroft * Page Protection Exception bits 118 1.4.2.2 mycroft */ 119 1.4.2.2 mycroft #define PGEX_P 0x01 /* Protection violation vs. not present */ 120 1.4.2.2 mycroft #define PGEX_W 0x02 /* during a Write cycle */ 121 1.4.2.2 mycroft #define PGEX_U 0x04 /* access from User mode (UPL) */ 122 1.4.2.2 mycroft 123 1.4.2.2 mycroft /* 124 1.4.2.2 mycroft * Pte related macros 125 1.4.2.2 mycroft */ 126 1.4.2.2 mycroft #define dirty(pte) ((pte)->pg_m) 127 1.4.2.2 mycroft 128 1.4.2.2 mycroft #ifndef LOCORE 129 1.4.2.2 mycroft #ifdef KERNEL 130 1.4.2.2 mycroft /* utilities defined in pmap.c */ 131 1.4.2.2 mycroft extern struct pte *Sysmap; 132 1.4.2.2 mycroft #endif 133 1.4.2.2 mycroft #endif 134 1.4.2.2 mycroft 135 1.4.2.2 mycroft #endif /* _I386_PTE_H_ */ 136
Indexes created Wed Oct 29 20:09:47 GMT 2025