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 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
35 * $FreeBSD: releng/6.3/sys/i386/include/vmparam.h 133827 2004-08-16 08:35:22Z obrien $
36 */
37
38
39 #ifndef _MACHINE_VMPARAM_H_
40 #define _MACHINE_VMPARAM_H_ 1
41
42 /*
43 * Machine dependent constants for 386.
44 */
45
46 #define VM_PROT_READ_IS_EXEC /* if you can read -- then you can exec */
47
48 /*
49 * Virtual memory related constants, all in bytes
50 */
51 #define MAXTSIZ (128UL*1024*1024) /* max text size */
52 #ifndef DFLDSIZ
53 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
54 #endif
55 #ifndef MAXDSIZ
56 #define MAXDSIZ (512UL*1024*1024) /* max data size */
57 #endif
58 #ifndef DFLSSIZ
59 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
60 #endif
61 #ifndef MAXSSIZ
62 #define MAXSSIZ (64UL*1024*1024) /* max stack size */
63 #endif
64 #ifndef SGROWSIZ
65 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
66 #endif
67
68 #define USRTEXT (1*PAGE_SIZE) /* base of user text XXX bogus */
69
70 /*
71 * The time for a process to be blocked before being very swappable.
72 * This is a number of seconds which the system takes as being a non-trivial
73 * amount of real time. You probably shouldn't change this;
74 * it is used in subtle ways (fractions and multiples of it are, that is, like
75 * half of a ``long time'', almost a long time, etc.)
76 * It is related to human patience and other factors which don't really
77 * change over time.
78 */
79 #define MAXSLP 20
80
81
82 /*
83 * Kernel physical load address.
84 */
85 #ifndef KERNLOAD
86 #define KERNLOAD (1 << PDRSHIFT)
87 #endif
88
89 /*
90 * Virtual addresses of things. Derived from the page directory and
91 * page table indexes from pmap.h for precision.
92 * Because of the page that is both a PD and PT, it looks a little
93 * messy at times, but hey, we'll do anything to save a page :-)
94 */
95
96 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1)
97 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI)
98
99 #define KERNBASE VADDR(KPTDI, 0)
100
101 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
102 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
103
104 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0)
105
106 #define USRSTACK VM_MAXUSER_ADDRESS
107
108 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
109 #define VM_MIN_ADDRESS ((vm_offset_t)0)
110
111 /* virtual sizes (bytes) for various kernel submaps */
112 #ifndef VM_KMEM_SIZE
113 #define VM_KMEM_SIZE (12 * 1024 * 1024)
114 #endif
115
116 /*
117 * How many physical pages per KVA page allocated.
118 * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX)
119 * is the total KVA space allocated for kmem_map.
120 */
121 #ifndef VM_KMEM_SIZE_SCALE
122 #define VM_KMEM_SIZE_SCALE (3)
123 #endif
124
125 /*
126 * Ceiling on amount of kmem_map kva space.
127 */
128 #ifndef VM_KMEM_SIZE_MAX
129 #define VM_KMEM_SIZE_MAX (320 * 1024 * 1024)
130 #endif
131
132 /* initial pagein size of beginning of executable file */
133 #ifndef VM_INITIAL_PAGEIN
134 #define VM_INITIAL_PAGEIN 16
135 #endif
136
137 #endif /* _MACHINE_VMPARAM_H_ */
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