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1.1 root 1: /*-
2: * Copyright (c) 1990 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * This code is derived from software contributed to Berkeley by
6: * William Jolitz.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: *
36: * @(#)pte.h 5.5 (Berkeley) 5/9/91
37: */
38:
39: /*
40: * 386 page table entry and page table directory
41: * W.Jolitz, 8/89
42: *
43: * There are two major kinds of pte's: those which have ever existed (and are
44: * thus either now in core or on the swap device), and those which have
45: * never existed, but which will be filled on demand at first reference.
46: * There is a structure describing each. There is also an ancillary
47: * structure used in page clustering.
48: */
49:
50: #ifndef LOCORE
51: struct pde
52: {
53: unsigned int
54: pd_v:1, /* valid bit */
55: pd_prot:2, /* access control */
56: pd_mbz1:2, /* reserved, must be zero */
57: pd_u:1, /* hardware maintained 'used' bit */
58: :1, /* not used */
59: pd_mbz2:2, /* reserved, must be zero */
60: :3, /* reserved for software */
61: pd_pfnum:20; /* physical page frame number of pte's*/
62: };
63: struct pte
64: {
65: unsigned int
66: pg_v:1, /* valid bit */
67: pg_prot:2, /* access control */
68: pg_mbz1:2, /* reserved, must be zero */
69: pg_u:1, /* hardware maintained 'used' bit */
70: pg_m:1, /* hardware maintained modified bit */
71: pg_mbz2:2, /* reserved, must be zero */
72: pg_fod:1, /* is fill on demand (=0) */
73: :1, /* must write back to swap (unused) */
74: pg_nc:1, /* 'uncacheable page' bit */
75: pg_pfnum:20; /* physical page frame number */
76: };
77: struct hpte
78: {
79: unsigned int
80: pg_high:12, /* special for clustering */
81: pg_pfnum:20;
82: };
83: struct fpte
84: {
85: unsigned int
86: pg_v:1, /* valid bit */
87: pg_prot:2, /* access control */
88: :5,
89: pg_fileno:1, /* file mapped from or TEXT or ZERO */
90: pg_fod:1, /* is fill on demand (=1) */
91: pg_blkno:22; /* file system block number */
92: };
93: #endif
94:
95: #define PD_MASK 0xffc00000 /* page directory address bits */
96: #define PD_SHIFT 22 /* page directory address bits */
97:
98: #define PG_V 0x00000001
99: #define PG_PROT 0x00000006 /* all protection bits . */
100: #define PG_FOD 0x00000200
101: #define PG_SWAPM 0x00000400
102: #define PG_N 0x00000800 /* Non-cacheable */
103: #define PG_M 0x00000040
104: #define PG_U 0x00000020 /* not currently used */
105: #define PG_FRAME 0xfffff000
106:
107: #define PG_FZERO 0
108: #define PG_FTEXT 1
109: #define PG_FMAX (PG_FTEXT)
110:
111: #define PG_NOACC 0
112: #define PG_KR 0x00000000
113: #define PG_KW 0x00000002
114: #define PG_URKR 0x00000004
115: #define PG_URKW 0x00000004
116: #define PG_UW 0x00000006
117:
118: /*
119: * Page Protection Exception bits
120: */
121:
122: #define PGEX_P 0x01 /* Protection violation vs. not present */
123: #define PGEX_W 0x02 /* during a Write cycle */
124: #define PGEX_U 0x04 /* access from User mode (UPL) */
125:
126: /*
127: * Pte related macros
128: */
129: #define dirty(pte) ((pte)->pg_m)
130:
131: #ifndef LOCORE
132: #ifdef KERNEL
133: /* utilities defined in pmap.c */
134: extern struct pte *Sysmap;
135: #endif
136: #endif
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