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/9.0/sys/i386/include/vmparam.h 221855 2011-05-13 19:35:01Z mdf $
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 physical address space is densely populated.
68 */
69 #define VM_PHYSSEG_DENSE
70
71 /*
72 * The number of PHYSSEG entries must be one greater than the number
73 * of phys_avail entries because the phys_avail entry that spans the
74 * largest physical address that is accessible by ISA DMA is split
75 * into two PHYSSEG entries.
76 */
77 #define VM_PHYSSEG_MAX 17
78
79 /*
80 * Create two free page pools. Since the i386 kernel virtual address
81 * space does not include a mapping onto the machine's entire physical
82 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
83 * pool, VM_FREEPOOL_DEFAULT.
84 */
85 #define VM_NFREEPOOL 2
86 #define VM_FREEPOOL_CACHE 1
87 #define VM_FREEPOOL_DEFAULT 0
88 #define VM_FREEPOOL_DIRECT 0
89
90 /*
91 * Create two free page lists: VM_FREELIST_DEFAULT is for physical
92 * pages that are above the largest physical address that is
93 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
94 * that are below that address.
95 */
96 #define VM_NFREELIST 2
97 #define VM_FREELIST_DEFAULT 0
98 #define VM_FREELIST_ISADMA 1
99
100 /*
101 * The largest allocation size is 2MB under PAE and 4MB otherwise.
102 */
103 #ifdef PAE
104 #define VM_NFREEORDER 10
105 #else
106 #define VM_NFREEORDER 11
107 #endif
108
109 /*
110 * Only one memory domain.
111 */
112 #ifndef VM_NDOMAIN
113 #define VM_NDOMAIN 1
114 #endif
115
116 /*
117 * Enable superpage reservations: 1 level.
118 */
119 #ifndef VM_NRESERVLEVEL
120 #define VM_NRESERVLEVEL 1
121 #endif
122
123 /*
124 * Level 0 reservations consist of 512 pages under PAE and 1024 pages
125 * otherwise.
126 */
127 #ifndef VM_LEVEL_0_ORDER
128 #ifdef PAE
129 #define VM_LEVEL_0_ORDER 9
130 #else
131 #define VM_LEVEL_0_ORDER 10
132 #endif
133 #endif
134
135 /*
136 * Kernel physical load address.
137 */
138 #ifndef KERNLOAD
139 #if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST)
140 #define KERNLOAD 0
141 #else
142 #define KERNLOAD (1 << PDRSHIFT)
143 #endif
144 #endif /* !defined(KERNLOAD) */
145
146 /*
147 * Virtual addresses of things. Derived from the page directory and
148 * page table indexes from pmap.h for precision.
149 * Because of the page that is both a PD and PT, it looks a little
150 * messy at times, but hey, we'll do anything to save a page :-)
151 */
152
153 #ifdef XEN
154 #define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START
155 #else
156 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1)
157 #endif
158
159 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI)
160
161 #define KERNBASE VADDR(KPTDI, 0)
162
163 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
164 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
165
166 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0)
167
168 #define USRSTACK VM_MAXUSER_ADDRESS
169
170 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
171 #define VM_MIN_ADDRESS ((vm_offset_t)0)
172
173 /* virtual sizes (bytes) for various kernel submaps */
174 #ifndef VM_KMEM_SIZE
175 #define VM_KMEM_SIZE (12 * 1024 * 1024)
176 #endif
177
178 /*
179 * How many physical pages per KVA page allocated.
180 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
181 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
182 * is the total KVA space allocated for kmem_map.
183 */
184 #ifndef VM_KMEM_SIZE_SCALE
185 #define VM_KMEM_SIZE_SCALE (3)
186 #endif
187
188 /*
189 * Ceiling on amount of kmem_map kva space.
190 */
191 #ifndef VM_KMEM_SIZE_MAX
192 #define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \
193 VM_MIN_KERNEL_ADDRESS) * 2 / 5)
194 #endif
195
196 /* initial pagein size of beginning of executable file */
197 #ifndef VM_INITIAL_PAGEIN
198 #define VM_INITIAL_PAGEIN 16
199 #endif
200
201 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
202
203 #endif /* _MACHINE_VMPARAM_H_ */
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