projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| da7c5cc6 KM |
1 | /* |
| 2 | * Copyright (c) 1982 Regents of the University of California. | |
| 3 | * All rights reserved. The Berkeley software License Agreement | |
| 4 | * specifies the terms and conditions for redistribution. | |
| 5 | * | |
| 6 | * @(#)pte.h 6.5 (Berkeley) %G% | |
| 7 | */ | |
| cb3a5783 BJ |
8 | |
| 9 | /* | |
| 10 | * VAX page table entry | |
| 11 | * | |
| 12 | * There are two major kinds of pte's: those which have ever existed (and are | |
| 13 | * thus either now in core or on the swap device), and those which have | |
| 14 | * never existed, but which will be filled on demand at first reference. | |
| 15 | * There is a structure describing each. There is also an ancillary | |
| 16 | * structure used in page clustering. | |
| 17 | */ | |
| 18 | ||
| 5d1a7b0a | 19 | #ifndef LOCORE |
| cb3a5783 BJ |
20 | struct pte |
| 21 | { | |
| 22 | unsigned int pg_pfnum:21, /* core page frame number or 0 */ | |
| 23 | :2, | |
| 24 | pg_vreadm:1, /* modified since vread (or with _m) */ | |
| 25 | pg_swapm:1, /* have to write back to swap */ | |
| 26 | pg_fod:1, /* is fill on demand (=0) */ | |
| 27 | pg_m:1, /* hardware maintained modified bit */ | |
| 28 | pg_prot:4, /* access control */ | |
| 29 | pg_v:1; /* valid bit */ | |
| 30 | }; | |
| 31 | struct hpte | |
| 32 | { | |
| 33 | unsigned int pg_pfnum:21, | |
| 34 | :2, | |
| 35 | pg_high:9; /* special for clustering */ | |
| 36 | }; | |
| 37 | struct fpte | |
| 38 | { | |
| b834dc16 KM |
39 | unsigned int pg_blkno:24, /* file system block number */ |
| 40 | pg_fileno:1, /* file mapped from or TEXT or ZERO */ | |
| cb3a5783 BJ |
41 | pg_fod:1, /* is fill on demand (=1) */ |
| 42 | :1, | |
| 43 | pg_prot:4, | |
| 44 | pg_v:1; | |
| 45 | }; | |
| 5d1a7b0a | 46 | #endif |
| cb3a5783 BJ |
47 | |
| 48 | #define PG_V 0x80000000 | |
| 49 | #define PG_PROT 0x78000000 | |
| 50 | #define PG_M 0x04000000 | |
| 3e2f54af | 51 | #define PG_FOD 0x02000000 |
| cb3a5783 BJ |
52 | #define PG_VREADM 0x00800000 |
| 53 | #define PG_PFNUM 0x001fffff | |
| 54 | ||
| 3765e049 MK |
55 | #define PG_FZERO 0 |
| 56 | #define PG_FTEXT 1 | |
| cb3a5783 BJ |
57 | #define PG_FMAX (PG_FTEXT) |
| 58 | ||
| 59 | #define PG_NOACC 0 | |
| 60 | #define PG_KW 0x10000000 | |
| 61 | #define PG_KR 0x18000000 | |
| 62 | #define PG_UW 0x20000000 | |
| 63 | #define PG_URKW 0x70000000 | |
| 64 | #define PG_URKR 0x78000000 | |
| 65 | ||
| 66 | /* | |
| 67 | * Pte related macros | |
| 68 | */ | |
| 69 | #define dirty(pte) ((pte)->pg_fod == 0 && (pte)->pg_pfnum && \ | |
| 70 | ((pte)->pg_m || (pte)->pg_swapm)) | |
| 71 | ||
| 5d1a7b0a | 72 | #ifndef LOCORE |
| cb3a5783 | 73 | #ifdef KERNEL |
| cb3a5783 BJ |
74 | |
| 75 | /* utilities defined in locore.s */ | |
| 76 | extern struct pte Sysmap[]; | |
| 77 | extern struct pte Usrptmap[]; | |
| 78 | extern struct pte usrpt[]; | |
| 79 | extern struct pte Swapmap[]; | |
| 80 | extern struct pte Forkmap[]; | |
| 81 | extern struct pte Xswapmap[]; | |
| 82 | extern struct pte Xswap2map[]; | |
| 83 | extern struct pte Pushmap[]; | |
| 84 | extern struct pte Vfmap[]; | |
| 85 | extern struct pte mmap[]; | |
| a5e17cf9 | 86 | extern struct pte msgbufmap[]; |
| b7c71f19 | 87 | extern struct pte camap[]; |
| 4d752f43 | 88 | extern struct pte Nexmap[][16]; |
| cb3a5783 | 89 | #endif |
| 5d1a7b0a | 90 | #endif |