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/8.0/sys/i386/include/vmparam.h 190705 2009-04-04 23:12:14Z alc $
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 /*
47 * Virtual memory related constants, all in bytes
48 */
49 #define MAXTSIZ (128UL*1024*1024) /* max text size */
50 #ifndef DFLDSIZ
51 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
52 #endif
53 #ifndef MAXDSIZ
54 #define MAXDSIZ (512UL*1024*1024) /* max data size */
55 #endif
56 #ifndef DFLSSIZ
57 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
58 #endif
59 #ifndef MAXSSIZ
60 #define MAXSSIZ (64UL*1024*1024) /* max stack size */
61 #endif
62 #ifndef SGROWSIZ
63 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
64 #endif
65
66 /*
67 * The time for a process to be blocked before being very swappable.
68 * This is a number of seconds which the system takes as being a non-trivial
69 * amount of real time. You probably shouldn't change this;
70 * it is used in subtle ways (fractions and multiples of it are, that is, like
71 * half of a ``long time'', almost a long time, etc.)
72 * It is related to human patience and other factors which don't really
73 * change over time.
74 */
75 #define MAXSLP 20
76
77
78 /*
79 * The physical address space is densely populated.
80 */
81 #define VM_PHYSSEG_DENSE
82
83 /*
84 * The number of PHYSSEG entries must be one greater than the number
85 * of phys_avail entries because the phys_avail entry that spans the
86 * largest physical address that is accessible by ISA DMA is split
87 * into two PHYSSEG entries.
88 */
89 #define VM_PHYSSEG_MAX 17
90
91 /*
92 * Create two free page pools. Since the i386 kernel virtual address
93 * space does not include a mapping onto the machine's entire physical
94 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
95 * pool, VM_FREEPOOL_DEFAULT.
96 */
97 #define VM_NFREEPOOL 2
98 #define VM_FREEPOOL_CACHE 1
99 #define VM_FREEPOOL_DEFAULT 0
100 #define VM_FREEPOOL_DIRECT 0
101
102 /*
103 * Create two free page lists: VM_FREELIST_DEFAULT is for physical
104 * pages that are above the largest physical address that is
105 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
106 * that are below that address.
107 */
108 #define VM_NFREELIST 2
109 #define VM_FREELIST_DEFAULT 0
110 #define VM_FREELIST_ISADMA 1
111
112 /*
113 * The largest allocation size is 2MB under PAE and 4MB otherwise.
114 */
115 #ifdef PAE
116 #define VM_NFREEORDER 10
117 #else
118 #define VM_NFREEORDER 11
119 #endif
120
121 /*
122 * Enable superpage reservations: 1 level.
123 */
124 #ifndef VM_NRESERVLEVEL
125 #define VM_NRESERVLEVEL 1
126 #endif
127
128 /*
129 * Level 0 reservations consist of 512 pages under PAE and 1024 pages
130 * otherwise.
131 */
132 #ifndef VM_LEVEL_0_ORDER
133 #ifdef PAE
134 #define VM_LEVEL_0_ORDER 9
135 #else
136 #define VM_LEVEL_0_ORDER 10
137 #endif
138 #endif
139
140 /*
141 * Kernel physical load address.
142 */
143 #ifndef KERNLOAD
144 #if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST)
145 #define KERNLOAD 0
146 #else
147 #define KERNLOAD (1 << PDRSHIFT)
148 #endif
149 #endif /* !defined(KERNLOAD) */
150
151 /*
152 * Virtual addresses of things. Derived from the page directory and
153 * page table indexes from pmap.h for precision.
154 * Because of the page that is both a PD and PT, it looks a little
155 * messy at times, but hey, we'll do anything to save a page :-)
156 */
157
158 #ifdef XEN
159 #define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START
160 #else
161 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1)
162 #endif
163
164 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI)
165
166 #define KERNBASE VADDR(KPTDI, 0)
167
168 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
169 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
170
171 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0)
172
173 #define USRSTACK VM_MAXUSER_ADDRESS
174
175 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
176 #define VM_MIN_ADDRESS ((vm_offset_t)0)
177
178 /* virtual sizes (bytes) for various kernel submaps */
179 #ifndef VM_KMEM_SIZE
180 #define VM_KMEM_SIZE (12 * 1024 * 1024)
181 #endif
182
183 /*
184 * How many physical pages per KVA page allocated.
185 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
186 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
187 * is the total KVA space allocated for kmem_map.
188 */
189 #ifndef VM_KMEM_SIZE_SCALE
190 #define VM_KMEM_SIZE_SCALE (3)
191 #endif
192
193 /*
194 * Ceiling on amount of kmem_map kva space.
195 */
196 #ifndef VM_KMEM_SIZE_MAX
197 #define VM_KMEM_SIZE_MAX (320 * 1024 * 1024)
198 #endif
199
200 /* initial pagein size of beginning of executable file */
201 #ifndef VM_INITIAL_PAGEIN
202 #define VM_INITIAL_PAGEIN 16
203 #endif
204
205 #endif /* _MACHINE_VMPARAM_H_ */
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