projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 1fd9cec2 | 1 | /* pte.h 1.3 86/01/17 */ |
| dbccc6a3 SL |
2 | |
| 3 | /* | |
| 4 | * Tahoe 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 | #ifndef LOCORE | |
| 14 | struct pte | |
| 15 | { | |
| 16 | unsigned int | |
| 17 | pg_v:1, /* valid bit */ | |
| 18 | pg_prot:4, /* access control */ | |
| 19 | pg_fod:1, /* is fill on demand (=0) */ | |
| a55e280b | 20 | :1, /* must write back to swap (unused) */ |
| dbccc6a3 SL |
21 | pg_nc:1, /* 'uncacheable page' bit */ |
| 22 | pg_m:1, /* hardware maintained modified bit */ | |
| a55e280b | 23 | pg_u:1, /* hardware maintained 'used' bit */ |
| dbccc6a3 SL |
24 | pg_pfnum:22; /* core page frame number or 0 */ |
| 25 | }; | |
| 26 | struct hpte | |
| 27 | { | |
| 28 | unsigned int | |
| 29 | pg_high:10, /* special for clustering */ | |
| 30 | pg_pfnum:22; | |
| 31 | }; | |
| 32 | struct fpte | |
| 33 | { | |
| 34 | unsigned int | |
| 35 | pg_v:1, | |
| 36 | pg_prot:4, | |
| 37 | pg_fod:1, /* is fill on demand (=1) */ | |
| 38 | :1, | |
| a55e280b SL |
39 | pg_fileno:1, /* file mapped from or TEXT or ZERO */ |
| 40 | pg_blkno:24; /* file system block number */ | |
| dbccc6a3 SL |
41 | }; |
| 42 | #endif | |
| 43 | ||
| 44 | #define PG_V 0x80000000 | |
| 45 | #define PG_PROT 0x78000000 /* all protection bits (dorit). */ | |
| 46 | #define PG_FOD 0x04000000 | |
| 47 | #define PG_SWAPM 0x02000000 | |
| 48 | #define PG_N 0x01000000 /* Non-cacheable */ | |
| 49 | #define PG_M 0x00800000 | |
| a55e280b | 50 | #define PG_U 0x00400000 /* not currently used */ |
| dbccc6a3 SL |
51 | #define PG_PFNUM 0x003fffff |
| 52 | ||
| a55e280b SL |
53 | #define PG_FZERO 0 |
| 54 | #define PG_FTEXT 1 | |
| dbccc6a3 SL |
55 | #define PG_FMAX (PG_FTEXT) |
| 56 | ||
| 57 | #define PG_NOACC 0 | |
| 58 | #define PG_KR 0x40000000 | |
| 59 | #define PG_KW 0x60000000 | |
| 60 | #define PG_URKR 0x50000000 | |
| 61 | #define PG_URKW 0x70000000 | |
| 62 | #define PG_UW 0x78000000 | |
| 63 | ||
| 64 | /* | |
| 65 | * Pte related macros | |
| 66 | */ | |
| a55e280b | 67 | #define dirty(pte) ((pte)->pg_fod == 0 && (pte)->pg_pfnum && (pte)->pg_m) |
| dbccc6a3 SL |
68 | |
| 69 | #ifndef LOCORE | |
| 70 | #ifdef KERNEL | |
| dbccc6a3 SL |
71 | /* utilities defined in locore.s */ |
| 72 | extern struct pte Sysmap[]; | |
| 73 | extern struct pte Usrptmap[]; | |
| 74 | extern struct pte usrpt[]; | |
| 75 | extern struct pte Swapmap[]; | |
| 76 | extern struct pte Forkmap[]; | |
| 77 | extern struct pte Xswapmap[]; | |
| 78 | extern struct pte Xswap2map[]; | |
| 79 | extern struct pte Pushmap[]; | |
| 80 | extern struct pte Vfmap[]; | |
| dbccc6a3 SL |
81 | extern struct pte mmap[]; |
| 82 | extern struct pte msgbufmap[]; | |
| 83 | extern struct pte camap[]; | |
| 84 | #endif | |
| 85 | #endif |