projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 4e0c95d7 | 1 | /* pte.h 4.1 %G% */ |
| cb3a5783 BJ |
2 | |
| 3 | /* | |
| 4 | * VAX page table entry | |
| 5 | * | |
| 6 | * There are two major kinds of pte's: those which have ever existed (and are | |
| 7 | * thus either now in core or on the swap device), and those which have | |
| 8 | * never existed, but which will be filled on demand at first reference. | |
| 9 | * There is a structure describing each. There is also an ancillary | |
| 10 | * structure used in page clustering. | |
| 11 | */ | |
| 12 | ||
| 13 | struct pte | |
| 14 | { | |
| 15 | unsigned int pg_pfnum:21, /* core page frame number or 0 */ | |
| 16 | :2, | |
| 17 | pg_vreadm:1, /* modified since vread (or with _m) */ | |
| 18 | pg_swapm:1, /* have to write back to swap */ | |
| 19 | pg_fod:1, /* is fill on demand (=0) */ | |
| 20 | pg_m:1, /* hardware maintained modified bit */ | |
| 21 | pg_prot:4, /* access control */ | |
| 22 | pg_v:1; /* valid bit */ | |
| 23 | }; | |
| 24 | struct hpte | |
| 25 | { | |
| 26 | unsigned int pg_pfnum:21, | |
| 27 | :2, | |
| 28 | pg_high:9; /* special for clustering */ | |
| 29 | }; | |
| 30 | struct fpte | |
| 31 | { | |
| 32 | unsigned int pg_blkno:20, /* file system block number */ | |
| 33 | pg_fileno:5, /* file mapped from or TEXT or ZERO */ | |
| 34 | pg_fod:1, /* is fill on demand (=1) */ | |
| 35 | :1, | |
| 36 | pg_prot:4, | |
| 37 | pg_v:1; | |
| 38 | }; | |
| 39 | ||
| 40 | #define PG_V 0x80000000 | |
| 41 | #define PG_PROT 0x78000000 | |
| 42 | #define PG_M 0x04000000 | |
| 43 | #define PG_VREADM 0x00800000 | |
| 44 | #define PG_PFNUM 0x001fffff | |
| 45 | ||
| 46 | #define PG_FZERO (NOFILE) | |
| 47 | #define PG_FTEXT (NOFILE+1) | |
| 48 | #define PG_FMAX (PG_FTEXT) | |
| 49 | ||
| 50 | #define PG_NOACC 0 | |
| 51 | #define PG_KW 0x10000000 | |
| 52 | #define PG_KR 0x18000000 | |
| 53 | #define PG_UW 0x20000000 | |
| 54 | #define PG_URKW 0x70000000 | |
| 55 | #define PG_URKR 0x78000000 | |
| 56 | ||
| 57 | /* | |
| 58 | * Pte related macros | |
| 59 | */ | |
| 60 | #define dirty(pte) ((pte)->pg_fod == 0 && (pte)->pg_pfnum && \ | |
| 61 | ((pte)->pg_m || (pte)->pg_swapm)) | |
| 62 | ||
| 63 | #ifdef KERNEL | |
| 64 | struct pte *vtopte(); | |
| 65 | ||
| 66 | /* utilities defined in locore.s */ | |
| 67 | extern struct pte Sysmap[]; | |
| 68 | extern struct pte Usrptmap[]; | |
| 69 | extern struct pte usrpt[]; | |
| 70 | extern struct pte Swapmap[]; | |
| 71 | extern struct pte Forkmap[]; | |
| 72 | extern struct pte Xswapmap[]; | |
| 73 | extern struct pte Xswap2map[]; | |
| 74 | extern struct pte Pushmap[]; | |
| 75 | extern struct pte Vfmap[]; | |
| 76 | extern struct pte mmap[]; | |
| 77 | extern struct pte mcrmap[]; | |
| 4b84dfbd | 78 | extern struct pte bufmap[]; |
| cb3a5783 | 79 | #endif |