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f3ae3368 C |
1 | /* pte.h 4.9 81/05/14 */ |
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 | #ifndef LOCORE | |
14 | struct pte | |
15 | { | |
16 | unsigned int pg_pfnum:21, /* core page frame number or 0 */ | |
17 | :2, | |
18 | pg_vreadm:1, /* modified since vread (or with _m) */ | |
19 | pg_swapm:1, /* have to write back to swap */ | |
20 | pg_fod:1, /* is fill on demand (=0) */ | |
21 | pg_m:1, /* hardware maintained modified bit */ | |
22 | pg_prot:4, /* access control */ | |
23 | pg_v:1; /* valid bit */ | |
24 | }; | |
25 | struct hpte | |
26 | { | |
27 | unsigned int pg_pfnum:21, | |
28 | :2, | |
29 | pg_high:9; /* special for clustering */ | |
30 | }; | |
31 | struct fpte | |
32 | { | |
33 | unsigned int pg_blkno:20, /* file system block number */ | |
34 | pg_fileno:5, /* file mapped from or TEXT or ZERO */ | |
35 | pg_fod:1, /* is fill on demand (=1) */ | |
36 | :1, | |
37 | pg_prot:4, | |
38 | pg_v:1; | |
39 | }; | |
40 | #endif | |
41 | ||
42 | #define PG_V 0x80000000 | |
43 | #define PG_PROT 0x78000000 | |
44 | #define PG_M 0x04000000 | |
45 | #define PG_FOD 0x02000000 | |
46 | #define PG_VREADM 0x00800000 | |
47 | #define PG_PFNUM 0x001fffff | |
48 | ||
49 | #define PG_FZERO (NOFILE) | |
50 | #define PG_FTEXT (NOFILE+1) | |
51 | #define PG_FMAX (PG_FTEXT) | |
52 | ||
53 | #define PG_NOACC 0 | |
54 | #define PG_KW 0x10000000 | |
55 | #define PG_KR 0x18000000 | |
56 | #define PG_UW 0x20000000 | |
57 | #define PG_URKW 0x70000000 | |
58 | #define PG_URKR 0x78000000 | |
59 | ||
60 | /* | |
61 | * Pte related macros | |
62 | */ | |
63 | #define dirty(pte) ((pte)->pg_fod == 0 && (pte)->pg_pfnum && \ | |
64 | ((pte)->pg_m || (pte)->pg_swapm)) | |
65 | ||
66 | #ifndef LOCORE | |
67 | #ifdef KERNEL | |
68 | struct pte *vtopte(); | |
69 | ||
70 | /* utilities defined in locore.s */ | |
71 | extern struct pte Sysmap[]; | |
72 | extern struct pte Usrptmap[]; | |
73 | extern struct pte usrpt[]; | |
74 | extern struct pte Swapmap[]; | |
75 | extern struct pte Forkmap[]; | |
76 | extern struct pte Xswapmap[]; | |
77 | extern struct pte Xswap2map[]; | |
78 | extern struct pte Pushmap[]; | |
79 | extern struct pte Vfmap[]; | |
80 | extern struct pte mmap[]; | |
81 | extern struct pte msgbufmap[]; | |
82 | extern struct pte camap[]; | |
83 | extern struct pte Nexmap[][16]; | |
84 | #endif | |
85 | #endif |