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/10.3/sys/i386/include/vmparam.h 282065 2015-04-27 08:02:12Z kib $
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 * Choose between DENSE and SPARSE based on whether lower execution time or
68 * lower kernel address space consumption is desired. Under PAE, kernel
69 * address space is often in short supply.
70 */
71 #ifdef PAE
72 #define VM_PHYSSEG_SPARSE
73 #else
74 #define VM_PHYSSEG_DENSE
75 #endif
76
77 /*
78 * The number of PHYSSEG entries must be one greater than the number
79 * of phys_avail entries because the phys_avail entry that spans the
80 * largest physical address that is accessible by ISA DMA is split
81 * into two PHYSSEG entries.
82 */
83 #define VM_PHYSSEG_MAX 17
84
85 /*
86 * Create two free page pools. Since the i386 kernel virtual address
87 * space does not include a mapping onto the machine's entire physical
88 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
89 * pool, VM_FREEPOOL_DEFAULT.
90 */
91 #define VM_NFREEPOOL 2
92 #define VM_FREEPOOL_CACHE 1
93 #define VM_FREEPOOL_DEFAULT 0
94 #define VM_FREEPOOL_DIRECT 0
95
96 /*
97 * Create two free page lists: VM_FREELIST_DEFAULT is for physical
98 * pages that are above the largest physical address that is
99 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
100 * that are below that address.
101 */
102 #define VM_NFREELIST 2
103 #define VM_FREELIST_DEFAULT 0
104 #define VM_FREELIST_ISADMA 1
105
106 /*
107 * The largest allocation size is 2MB under PAE and 4MB otherwise.
108 */
109 #ifdef PAE
110 #define VM_NFREEORDER 10
111 #else
112 #define VM_NFREEORDER 11
113 #endif
114
115 /*
116 * Enable superpage reservations: 1 level.
117 */
118 #ifndef VM_NRESERVLEVEL
119 #define VM_NRESERVLEVEL 1
120 #endif
121
122 /*
123 * Level 0 reservations consist of 512 pages when PAE pagetables are
124 * used, and 1024 pages otherwise.
125 */
126 #ifndef VM_LEVEL_0_ORDER
127 #if defined(PAE) || defined(PAE_TABLES)
128 #define VM_LEVEL_0_ORDER 9
129 #else
130 #define VM_LEVEL_0_ORDER 10
131 #endif
132 #endif
133
134 /*
135 * Kernel physical load address.
136 */
137 #ifndef KERNLOAD
138 #if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST)
139 #define KERNLOAD 0
140 #else
141 #define KERNLOAD (1 << PDRSHIFT)
142 #endif
143 #endif /* !defined(KERNLOAD) */
144
145 /*
146 * Virtual addresses of things. Derived from the page directory and
147 * page table indexes from pmap.h for precision.
148 * Because of the page that is both a PD and PT, it looks a little
149 * messy at times, but hey, we'll do anything to save a page :-)
150 */
151
152 #ifdef XEN
153 #define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START
154 #else
155 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1)
156 #endif
157
158 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI)
159
160 #define KERNBASE VADDR(KPTDI, 0)
161
162 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
163 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
164
165 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0)
166
167 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
168 #define USRSTACK SHAREDPAGE
169
170 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
171 #define VM_MIN_ADDRESS ((vm_offset_t)0)
172
173 /*
174 * How many physical pages per kmem arena virtual page.
175 */
176 #ifndef VM_KMEM_SIZE_SCALE
177 #define VM_KMEM_SIZE_SCALE (3)
178 #endif
179
180 /*
181 * Optional floor (in bytes) on the size of the kmem arena.
182 */
183 #ifndef VM_KMEM_SIZE_MIN
184 #define VM_KMEM_SIZE_MIN (12 * 1024 * 1024)
185 #endif
186
187 /*
188 * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
189 * kernel map rounded to the nearest multiple of the superpage size.
190 */
191 #ifndef VM_KMEM_SIZE_MAX
192 #define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \
193 VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT)
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 #ifndef VM_MAX_AUTOTUNE_MAXUSERS
204 #define VM_MAX_AUTOTUNE_MAXUSERS 384
205 #endif
206
207 #endif /* _MACHINE_VMPARAM_H_ */
Cache object: 0ad0a8366cb40bf1d3f891eb8ee549e8
|