projects / unix-history / blame
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|---|---|---|
| 28a753c6 WJ |
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 | * @(#)pte.h 5.5 (Berkeley) 5/9/91 | |
| 37 | */ | |
| 38 | ||
| 39 | /* | |
| 40 | * 386 page table entry and page table directory | |
| 41 | * W.Jolitz, 8/89 | |
| 42 | * | |
| 43 | * There are two major kinds of pte's: those which have ever existed (and are | |
| 44 | * thus either now in core or on the swap device), and those which have | |
| 45 | * never existed, but which will be filled on demand at first reference. | |
| 46 | * There is a structure describing each. There is also an ancillary | |
| 47 | * structure used in page clustering. | |
| 48 | */ | |
| 49 | ||
| 50 | #ifndef LOCORE | |
| 51 | struct pde | |
| 52 | { | |
| 53 | unsigned int | |
| 54 | pd_v:1, /* valid bit */ | |
| 55 | pd_prot:2, /* access control */ | |
| 56 | pd_mbz1:2, /* reserved, must be zero */ | |
| 57 | pd_u:1, /* hardware maintained 'used' bit */ | |
| 58 | :1, /* not used */ | |
| 59 | pd_mbz2:2, /* reserved, must be zero */ | |
| 60 | :3, /* reserved for software */ | |
| 61 | pd_pfnum:20; /* physical page frame number of pte's*/ | |
| 62 | }; | |
| 63 | struct pte | |
| 64 | { | |
| 65 | unsigned int | |
| 66 | pg_v:1, /* valid bit */ | |
| 67 | pg_prot:2, /* access control */ | |
| 68 | pg_mbz1:2, /* reserved, must be zero */ | |
| 69 | pg_u:1, /* hardware maintained 'used' bit */ | |
| 70 | pg_m:1, /* hardware maintained modified bit */ | |
| 71 | pg_mbz2:2, /* reserved, must be zero */ | |
| 72 | pg_fod:1, /* is fill on demand (=0) */ | |
| 73 | :1, /* must write back to swap (unused) */ | |
| 74 | pg_nc:1, /* 'uncacheable page' bit */ | |
| 75 | pg_pfnum:20; /* physical page frame number */ | |
| 76 | }; | |
| 77 | struct hpte | |
| 78 | { | |
| 79 | unsigned int | |
| 80 | pg_high:12, /* special for clustering */ | |
| 81 | pg_pfnum:20; | |
| 82 | }; | |
| 83 | struct fpte | |
| 84 | { | |
| 85 | unsigned int | |
| 86 | pg_v:1, /* valid bit */ | |
| 87 | pg_prot:2, /* access control */ | |
| 88 | :5, | |
| 89 | pg_fileno:1, /* file mapped from or TEXT or ZERO */ | |
| 90 | pg_fod:1, /* is fill on demand (=1) */ | |
| 91 | pg_blkno:22; /* file system block number */ | |
| 92 | }; | |
| 93 | #endif | |
| 94 | ||
| 95 | #define PD_MASK 0xffc00000 /* page directory address bits */ | |
| 96 | #define PD_SHIFT 22 /* page directory address bits */ | |
| 97 | ||
| 98 | #define PG_V 0x00000001 | |
| 99 | #define PG_PROT 0x00000006 /* all protection bits . */ | |
| 100 | #define PG_FOD 0x00000200 | |
| 101 | #define PG_SWAPM 0x00000400 | |
| 102 | #define PG_N 0x00000800 /* Non-cacheable */ | |
| 103 | #define PG_M 0x00000040 | |
| 104 | #define PG_U 0x00000020 /* not currently used */ | |
| 105 | #define PG_FRAME 0xfffff000 | |
| 106 | ||
| 107 | #define PG_FZERO 0 | |
| 108 | #define PG_FTEXT 1 | |
| 109 | #define PG_FMAX (PG_FTEXT) | |
| 110 | ||
| 111 | #define PG_NOACC 0 | |
| 112 | #define PG_KR 0x00000000 | |
| 113 | #define PG_KW 0x00000002 | |
| 114 | #define PG_URKR 0x00000004 | |
| 115 | #define PG_URKW 0x00000004 | |
| 116 | #define PG_UW 0x00000006 | |
| 117 | ||
| 118 | /* | |
| 119 | * Page Protection Exception bits | |
| 120 | */ | |
| 121 | ||
| 122 | #define PGEX_P 0x01 /* Protection violation vs. not present */ | |
| 123 | #define PGEX_W 0x02 /* during a Write cycle */ | |
| 124 | #define PGEX_U 0x04 /* access from User mode (UPL) */ | |
| 125 | ||
| 126 | /* | |
| 127 | * Pte related macros | |
| 128 | */ | |
| 129 | #define dirty(pte) ((pte)->pg_m) | |
| 130 | ||
| 131 | #ifndef LOCORE | |
| 132 | #ifdef KERNEL | |
| 133 | /* utilities defined in pmap.c */ | |
| 134 | extern struct pte *Sysmap; | |
| 135 | #endif | |
| 136 | #endif |