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1.1 root 1: /* pte.h 4.9 81/05/14 */
2: /* Tahoe "used" bit version, May 1984 */
3:
4: /*
5: * Tahoe page table entry
6: *
7: * There are two major kinds of pte's: those which have ever existed (and are
8: * thus either now in core or on the swap device), and those which have
9: * never existed, but which will be filled on demand at first reference.
10: * There is a structure describing each. There is also an ancillary
11: * structure used in page clustering.
12: */
13:
14: #ifndef LOCORE
15: struct pte
16: {
17: unsigned int
18: pg_v:1, /* valid bit */
19: pg_prot:4, /* access control */
20: pg_fod:1, /* is fill on demand (=0) */
21: :1, /*swapm is not used in 4.2 */
22: pg_nc:1, /* 'uncacheable page' bit */
23: pg_m:1, /* hardware maintained modified bit */
24: pg_u:1, /* hardware maintained 'used' bit */
25: pg_pfnum:22; /* core page frame number or 0 */
26: };
27: struct hpte
28: {
29: unsigned int
30: pg_high:10, /* special for clustering */
31: pg_pfnum:22;
32: };
33: struct fpte
34: {
35: unsigned int
36: pg_v:1,
37: pg_prot:4,
38: pg_fod:1, /* is fill on demand (=1) */
39: :1,
40: pg_fileno:5, /* file mapped from or TEXT or ZERO */
41: pg_blkno:20; /* file system block number */
42: };
43: #endif
44:
45: #define PG_V 0x80000000
46: #define PG_PROT 0x78000000 /* all protection bits (dorit). */
47: #define PG_FOD 0x04000000
48: #define PG_N 0x01000000 /* Non-cacheable */
49: #define PG_M 0x00800000
50: #define PG_U 0x00400000
51: #define PG_PFNUM 0x003fffff
52:
53: #define PG_FZERO (NOFILE)
54: #define PG_FTEXT (NOFILE+1)
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: */
67: #define dirty(pte) ((pte)->pg_fod == 0 && (pte)->pg_pfnum && \
68: ((pte)->pg_m))
69:
70: #ifndef LOCORE
71: #ifdef KERNEL
72: struct pte *vtopte();
73:
74: /* utilities defined in locore.s */
75: extern struct pte Sysmap[];
76: extern struct pte Usrptmap[];
77: extern struct pte usrpt[];
78: extern struct pte Swapmap[];
79: extern struct pte Forkmap[];
80: extern struct pte Xswapmap[];
81: extern struct pte Xswap2map[];
82: extern struct pte Pushmap[];
83: extern struct pte Vfmap[];
84: /*
85: extern struct pte IOmap[];
86: */
87: extern struct pte VD0map[];
88: extern struct pte VD1map[];
89: extern struct pte VD2map[];
90: extern struct pte VD3map[];
91: extern struct pte UDmap[];
92: extern struct pte CY0map[];
93: extern struct pte CY1map[];
94: extern struct pte XYmap[];
95: extern struct pte mmap[];
96: extern struct pte msgbufmap[];
97: extern struct pte camap[];
98: #endif
99: #endif
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