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 #ifndef PAE 47 #define VM_PROT_READ_IS_EXEC /* if you can read -- then you can exec */ 48 #endif 49 50 /* 51 * Virtual memory related constants, all in bytes 52 */ 53 #define MAXTSIZ (128UL*1024*1024) /* max text size */ 54 #ifndef DFLDSIZ 55 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */ 56 #endif 57 #ifndef MAXDSIZ 58 #define MAXDSIZ (512UL*1024*1024) /* max data size */ 59 #endif 60 #ifndef DFLSSIZ 61 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */ 62 #endif 63 #ifndef MAXSSIZ 64 #define MAXSSIZ (64UL*1024*1024) /* max stack size */ 65 #endif 66 #ifndef SGROWSIZ 67 #define SGROWSIZ (128UL*1024) /* amount to grow stack */ 68 #endif 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 * The physical address space is densely populated. 84 */ 85 #define VM_PHYSSEG_DENSE 86 87 /* 88 * The number of PHYSSEG entries must be one greater than the number 89 * of phys_avail entries because the phys_avail entry that spans the 90 * largest physical address that is accessible by ISA DMA is split 91 * into two PHYSSEG entries. 92 */ 93 #define VM_PHYSSEG_MAX 17 94 95 /* 96 * Create two free page pools. Since the i386 kernel virtual address 97 * space does not include a mapping onto the machine's entire physical 98 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default 99 * pool, VM_FREEPOOL_DEFAULT. 100 */ 101 #define VM_NFREEPOOL 2 102 #define VM_FREEPOOL_CACHE 1 103 #define VM_FREEPOOL_DEFAULT 0 104 #define VM_FREEPOOL_DIRECT 0 105 106 /* 107 * Create two free page lists: VM_FREELIST_DEFAULT is for physical 108 * pages that are above the largest physical address that is 109 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages 110 * that are below that address. 111 */ 112 #define VM_NFREELIST 2 113 #define VM_FREELIST_DEFAULT 0 114 #define VM_FREELIST_ISADMA 1 115 116 /* 117 * The largest allocation size is 2MB under PAE and 4MB otherwise. 118 */ 119 #ifdef PAE 120 #define VM_NFREEORDER 10 121 #else 122 #define VM_NFREEORDER 11 123 #endif 124 125 /* 126 * Enable superpage reservations: 1 level. 127 */ 128 #ifndef VM_NRESERVLEVEL 129 #define VM_NRESERVLEVEL 1 130 #endif 131 132 /* 133 * Level 0 reservations consist of 512 pages under PAE and 1024 pages 134 * otherwise. 135 */ 136 #ifndef VM_LEVEL_0_ORDER 137 #ifdef PAE 138 #define VM_LEVEL_0_ORDER 9 139 #else 140 #define VM_LEVEL_0_ORDER 10 141 #endif 142 #endif 143 144 /* 145 * Kernel physical load address. 146 */ 147 #ifndef KERNLOAD 148 #if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST) 149 #define KERNLOAD 0 150 #else 151 #define KERNLOAD (1 << PDRSHIFT) 152 #endif 153 #endif /* !defined(KERNLOAD) */ 154 155 /* 156 * Virtual addresses of things. Derived from the page directory and 157 * page table indexes from pmap.h for precision. 158 * Because of the page that is both a PD and PT, it looks a little 159 * messy at times, but hey, we'll do anything to save a page :-) 160 */ 161 162 #ifdef XEN 163 #define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START 164 #else 165 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1) 166 #endif 167 168 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI) 169 170 #define KERNBASE VADDR(KPTDI, 0) 171 172 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 173 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) 174 175 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0) 176 177 #define USRSTACK VM_MAXUSER_ADDRESS 178 179 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 180 #define VM_MIN_ADDRESS ((vm_offset_t)0) 181 182 /* virtual sizes (bytes) for various kernel submaps */ 183 #ifndef VM_KMEM_SIZE 184 #define VM_KMEM_SIZE (12 * 1024 * 1024) 185 #endif 186 187 /* 188 * How many physical pages per KVA page allocated. 189 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), 190 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX) 191 * is the total KVA space allocated for kmem_map. 192 */ 193 #ifndef VM_KMEM_SIZE_SCALE 194 #define VM_KMEM_SIZE_SCALE (3) 195 #endif 196 197 /* 198 * Ceiling on amount of kmem_map kva space. 199 */ 200 #ifndef VM_KMEM_SIZE_MAX 201 #define VM_KMEM_SIZE_MAX (320 * 1024 * 1024) 202 #endif 203 204 /* initial pagein size of beginning of executable file */ 205 #ifndef VM_INITIAL_PAGEIN 206 #define VM_INITIAL_PAGEIN 16 207 #endif 208 209 #endif /* _MACHINE_VMPARAM_H_ */ 210