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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: *
1.1.1.2 ! root 36: * from: @(#)pte.h 5.5 (Berkeley) 5/9/91
! 37: * pte.h,v 1.3 1993/06/27 04:50:14 andrew Exp
1.1 root 38: */
39:
40: /*
41: * 386 page table entry and page table directory
42: * W.Jolitz, 8/89
43: *
44: * There are two major kinds of pte's: those which have ever existed (and are
45: * thus either now in core or on the swap device), and those which have
46: * never existed, but which will be filled on demand at first reference.
47: * There is a structure describing each. There is also an ancillary
48: * structure used in page clustering.
49: */
50:
1.1.1.2 ! root 51: #ifndef _I386_PTE_H_
! 52: #define _I386_PTE_H_
! 53:
1.1 root 54: #ifndef LOCORE
55: struct pde
56: {
57: unsigned int
58: pd_v:1, /* valid bit */
59: pd_prot:2, /* access control */
60: pd_mbz1:2, /* reserved, must be zero */
61: pd_u:1, /* hardware maintained 'used' bit */
62: :1, /* not used */
63: pd_mbz2:2, /* reserved, must be zero */
64: :3, /* reserved for software */
65: pd_pfnum:20; /* physical page frame number of pte's*/
66: };
67: struct pte
68: {
69: unsigned int
70: pg_v:1, /* valid bit */
71: pg_prot:2, /* access control */
72: pg_mbz1:2, /* reserved, must be zero */
73: pg_u:1, /* hardware maintained 'used' bit */
74: pg_m:1, /* hardware maintained modified bit */
75: pg_mbz2:2, /* reserved, must be zero */
76: pg_fod:1, /* is fill on demand (=0) */
77: :1, /* must write back to swap (unused) */
78: pg_nc:1, /* 'uncacheable page' bit */
79: pg_pfnum:20; /* physical page frame number */
80: };
81: struct hpte
82: {
83: unsigned int
84: pg_high:12, /* special for clustering */
85: pg_pfnum:20;
86: };
87: struct fpte
88: {
89: unsigned int
90: pg_v:1, /* valid bit */
91: pg_prot:2, /* access control */
92: :5,
93: pg_fileno:1, /* file mapped from or TEXT or ZERO */
94: pg_fod:1, /* is fill on demand (=1) */
95: pg_blkno:22; /* file system block number */
96: };
97: #endif
98:
99: #define PD_MASK 0xffc00000 /* page directory address bits */
100: #define PD_SHIFT 22 /* page directory address bits */
101:
102: #define PG_V 0x00000001
103: #define PG_PROT 0x00000006 /* all protection bits . */
104: #define PG_FOD 0x00000200
105: #define PG_SWAPM 0x00000400
106: #define PG_N 0x00000800 /* Non-cacheable */
107: #define PG_M 0x00000040
108: #define PG_U 0x00000020 /* not currently used */
109: #define PG_FRAME 0xfffff000
110:
111: #define PG_FZERO 0
112: #define PG_FTEXT 1
113: #define PG_FMAX (PG_FTEXT)
114:
115: #define PG_NOACC 0
116: #define PG_KR 0x00000000
117: #define PG_KW 0x00000002
118: #define PG_URKR 0x00000004
119: #define PG_URKW 0x00000004
120: #define PG_UW 0x00000006
121:
122: /*
123: * Page Protection Exception bits
124: */
125:
126: #define PGEX_P 0x01 /* Protection violation vs. not present */
127: #define PGEX_W 0x02 /* during a Write cycle */
128: #define PGEX_U 0x04 /* access from User mode (UPL) */
129:
130: /*
131: * Pte related macros
132: */
133: #define dirty(pte) ((pte)->pg_m)
134:
135: #ifndef LOCORE
136: #ifdef KERNEL
137: /* utilities defined in pmap.c */
138: extern struct pte *Sysmap;
139: #endif
140: #endif
1.1.1.2 ! root 141:
! 142: #endif /* _I386_PTE_H_ */
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