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 * from: @(#)param.h 5.8 (Berkeley) 6/28/91
37 * $FreeBSD: releng/5.2/sys/i386/include/param.h 116355 2003-06-14 23:23:55Z alc $
38 */
39
40 /*
41 * Machine dependent constants for Intel 386.
42 */
43
44 /*
45 * Round p (pointer or byte index) up to a correctly-aligned value
46 * for all data types (int, long, ...). The result is unsigned int
47 * and must be cast to any desired pointer type.
48 */
49 #ifndef _ALIGNBYTES
50 #define _ALIGNBYTES (sizeof(int) - 1)
51 #endif
52 #ifndef _ALIGN
53 #define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
54 #endif
55
56 #ifndef _MACHINE
57 #define _MACHINE i386
58 #endif
59 #ifndef _MACHINE_ARCH
60 #define _MACHINE_ARCH i386
61 #endif
62
63 #ifndef _NO_NAMESPACE_POLLUTION
64
65 #ifndef _MACHINE_PARAM_H_
66 #define _MACHINE_PARAM_H_
67
68 #ifndef MACHINE
69 #define MACHINE "i386"
70 #endif
71 #ifndef MACHINE_ARCH
72 #define MACHINE_ARCH "i386"
73 #endif
74 #define MID_MACHINE MID_I386
75
76 #ifdef SMP
77 #define MAXCPU 16
78 #else
79 #define MAXCPU 1
80 #endif /* SMP */
81
82 #define ALIGNBYTES _ALIGNBYTES
83 #define ALIGN(p) _ALIGN(p)
84
85 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
86 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
87 #define PAGE_MASK (PAGE_SIZE-1)
88 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
89
90 #ifdef PAE
91 #define NPGPTD 4
92 #define PDRSHIFT 21 /* LOG2(NBPDR) */
93 #else
94 #define NPGPTD 1
95 #define PDRSHIFT 22 /* LOG2(NBPDR) */
96 #endif
97
98 #define NBPTD (NPGPTD<<PAGE_SHIFT)
99 #define NPDEPTD (NBPTD/(sizeof (pd_entry_t)))
100 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
101 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
102 #define PDRMASK (NBPDR-1)
103
104 #define IOPAGES 2 /* pages of i/o permission bitmap */
105
106 #ifndef KSTACK_PAGES
107 #define KSTACK_PAGES 2 /* Includes pcb! */
108 #endif
109 #define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */
110 #define UAREA_PAGES 1 /* holds struct user WITHOUT PCB (see def.) */
111
112 /*
113 * Ceiling on amount of swblock kva space, can be changed via
114 * the kern.maxswzone /boot/loader.conf variable.
115 */
116 #ifndef VM_SWZONE_SIZE_MAX
117 #define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024)
118 #endif
119
120 /*
121 * Ceiling on size of buffer cache (really only effects write queueing,
122 * the VM page cache is not effected), can be changed via
123 * the kern.maxbcache /boot/loader.conf variable.
124 */
125 #ifndef VM_BCACHE_SIZE_MAX
126 #define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024)
127 #endif
128
129 /*
130 * Mach derived conversion macros
131 */
132 #define trunc_page(x) ((x) & ~PAGE_MASK)
133 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
134 #define trunc_4mpage(x) ((x) & ~PDRMASK)
135 #define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK)
136
137 #define atop(x) ((x) >> PAGE_SHIFT)
138 #define ptoa(x) ((x) << PAGE_SHIFT)
139
140 #define i386_btop(x) ((x) >> PAGE_SHIFT)
141 #define i386_ptob(x) ((x) << PAGE_SHIFT)
142
143 #define pgtok(x) ((x) * (PAGE_SIZE / 1024))
144
145 #endif /* !_MACHINE_PARAM_H_ */
146 #endif /* !_NO_NAMESPACE_POLLUTION */
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