1 /*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 * Copyright (c) 1994 John S. Dyson
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * William Jolitz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
39 * $FreeBSD$
40 */
41
42
43 #ifndef _MACHINE_VMPARAM_H_
44 #define _MACHINE_VMPARAM_H_ 1
45
46 /*
47 * Machine dependent constants for 386.
48 */
49
50 #define VM_PROT_READ_IS_EXEC /* if you can read -- then you can exec */
51
52 /*
53 * Virtual memory related constants, all in bytes
54 */
55 #define MAXTSIZ (128UL*1024*1024) /* max text size */
56 #ifndef DFLDSIZ
57 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
58 #endif
59 #ifndef MAXDSIZ
60 #define MAXDSIZ (512UL*1024*1024) /* max data size */
61 #endif
62 #ifndef DFLSSIZ
63 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
64 #endif
65 #ifndef MAXSSIZ
66 #define MAXSSIZ (64UL*1024*1024) /* max stack size */
67 #endif
68 #ifndef SGROWSIZ
69 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
70 #endif
71
72 #define USRTEXT (1*PAGE_SIZE) /* base of user text XXX bogus */
73
74 /*
75 * Size of the Shared Memory Pages page table.
76 */
77 #ifndef SHMMAXPGS
78 #define SHMMAXPGS 1024 /* XXX until we have more kmap space */
79 #endif
80
81 /*
82 * The time for a process to be blocked before being very swappable.
83 * This is a number of seconds which the system takes as being a non-trivial
84 * amount of real time. You probably shouldn't change this;
85 * it is used in subtle ways (fractions and multiples of it are, that is, like
86 * half of a ``long time'', almost a long time, etc.)
87 * It is related to human patience and other factors which don't really
88 * change over time.
89 */
90 #define MAXSLP 20
91
92
93 /*
94 * Virtual addresses of things. Derived from the page directory and
95 * page table indexes from pmap.h for precision.
96 * Because of the page that is both a PD and PT, it looks a little
97 * messy at times, but hey, we'll do anything to save a page :-)
98 */
99
100 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE, 0)
101 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI)
102
103 #define KERNBASE VADDR(KPTDI, 0)
104
105 #define KPT_MAX_ADDRESS VADDR(PTDPTDI, KPTDI+NKPT)
106 #define KPT_MIN_ADDRESS VADDR(PTDPTDI, KPTDI)
107
108 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
109 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
110
111 #define VM_MAXUSER_ADDRESS VADDR(UMAXPTDI, UMAXPTEOFF)
112
113 #define USRSTACK VM_MAXUSER_ADDRESS
114
115 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
116 #define VM_MIN_ADDRESS ((vm_offset_t)0)
117
118 /* virtual sizes (bytes) for various kernel submaps */
119 #ifndef VM_KMEM_SIZE
120 #define VM_KMEM_SIZE (12 * 1024 * 1024)
121 #endif
122
123 /*
124 * How many physical pages per KVA page allocated.
125 * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX)
126 * is the total KVA space allocated for kmem_map.
127 */
128 #ifndef VM_KMEM_SIZE_SCALE
129 #define VM_KMEM_SIZE_SCALE (3)
130 #endif
131
132 /*
133 * Ceiling on amount of kmem_map kva space.
134 */
135 #ifndef VM_KMEM_SIZE_MAX
136 #define VM_KMEM_SIZE_MAX (200 * 1024 * 1024)
137 #endif
138
139 /* initial pagein size of beginning of executable file */
140 #ifndef VM_INITIAL_PAGEIN
141 #define VM_INITIAL_PAGEIN 16
142 #endif
143
144 #endif /* _MACHINE_VMPARAM_H_ */
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