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 * $FreeBSD$ 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 * Only one memory domain. 123 */ 124 #ifndef VM_NDOMAIN 125 #define VM_NDOMAIN 1 126 #endif 127 128 /* 129 * Enable superpage reservations: 1 level. 130 */ 131 #ifndef VM_NRESERVLEVEL 132 #define VM_NRESERVLEVEL 1 133 #endif 134 135 /* 136 * Level 0 reservations consist of 512 pages under PAE and 1024 pages 137 * otherwise. 138 */ 139 #ifndef VM_LEVEL_0_ORDER 140 #ifdef PAE 141 #define VM_LEVEL_0_ORDER 9 142 #else 143 #define VM_LEVEL_0_ORDER 10 144 #endif 145 #endif 146 147 /* 148 * Kernel physical load address. 149 */ 150 #ifndef KERNLOAD 151 #if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST) 152 #define KERNLOAD 0 153 #else 154 #define KERNLOAD (1 << PDRSHIFT) 155 #endif 156 #endif /* !defined(KERNLOAD) */ 157 158 /* 159 * Virtual addresses of things. Derived from the page directory and 160 * page table indexes from pmap.h for precision. 161 * Because of the page that is both a PD and PT, it looks a little 162 * messy at times, but hey, we'll do anything to save a page :-) 163 */ 164 165 #ifdef XEN 166 #define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START 167 #else 168 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1) 169 #endif 170 171 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI) 172 173 #define KERNBASE VADDR(KPTDI, 0) 174 175 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 176 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) 177 178 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0) 179 180 #define USRSTACK VM_MAXUSER_ADDRESS 181 182 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 183 #define VM_MIN_ADDRESS ((vm_offset_t)0) 184 185 /* virtual sizes (bytes) for various kernel submaps */ 186 #ifndef VM_KMEM_SIZE 187 #define VM_KMEM_SIZE (12 * 1024 * 1024) 188 #endif 189 190 /* 191 * How many physical pages per KVA page allocated. 192 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), 193 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX) 194 * is the total KVA space allocated for kmem_map. 195 */ 196 #ifndef VM_KMEM_SIZE_SCALE 197 #define VM_KMEM_SIZE_SCALE (3) 198 #endif 199 200 /* 201 * Ceiling on amount of kmem_map kva space. 202 */ 203 #ifndef VM_KMEM_SIZE_MAX 204 #define VM_KMEM_SIZE_MAX (320 * 1024 * 1024) 205 #endif 206 207 /* initial pagein size of beginning of executable file */ 208 #ifndef VM_INITIAL_PAGEIN 209 #define VM_INITIAL_PAGEIN 16 210 #endif 211 212 #endif /* _MACHINE_VMPARAM_H_ */ 213