1 /* 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * The Mach Operating System project at Carnegie-Mellon University. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)vm_map.h 8.3 (Berkeley) 3/15/94 37 * 38 * 39 * Copyright (c) 1987, 1990 Carnegie-Mellon University. 40 * All rights reserved. 41 * 42 * Authors: Avadis Tevanian, Jr., Michael Wayne Young 43 * 44 * Permission to use, copy, modify and distribute this software and 45 * its documentation is hereby granted, provided that both the copyright 46 * notice and this permission notice appear in all copies of the 47 * software, derivative works or modified versions, and any portions 48 * thereof, and that both notices appear in supporting documentation. 49 * 50 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 51 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 52 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 53 * 54 * Carnegie Mellon requests users of this software to return to 55 * 56 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 57 * School of Computer Science 58 * Carnegie Mellon University 59 * Pittsburgh PA 15213-3890 60 * 61 * any improvements or extensions that they make and grant Carnegie the 62 * rights to redistribute these changes. 63 */ 64 65 /* 66 * Virtual memory map module definitions. 67 */ 68 69 #ifndef _VM_MAP_ 70 #define _VM_MAP_ 71 72 /* 73 * Types defined: 74 * 75 * vm_map_t the high-level address map data structure. 76 * vm_map_entry_t an entry in an address map. 77 * vm_map_version_t a timestamp of a map, for use with vm_map_lookup 78 */ 79 80 /* 81 * Objects which live in maps may be either VM objects, or 82 * another map (called a "sharing map") which denotes read-write 83 * sharing with other maps. 84 */ 85 86 union vm_map_object { 87 struct vm_object *vm_object; /* object object */ 88 struct vm_map *share_map; /* share map */ 89 struct vm_map *sub_map; /* belongs to another map */ 90 }; 91 92 /* 93 * Address map entries consist of start and end addresses, 94 * a VM object (or sharing map) and offset into that object, 95 * and user-exported inheritance and protection information. 96 * Also included is control information for virtual copy operations. 97 */ 98 struct vm_map_entry { 99 struct vm_map_entry *prev; /* previous entry */ 100 struct vm_map_entry *next; /* next entry */ 101 vm_offset_t start; /* start address */ 102 vm_offset_t end; /* end address */ 103 union vm_map_object object; /* object I point to */ 104 vm_offset_t offset; /* offset into object */ 105 boolean_t is_a_map:1, /* Is "object" a map? */ 106 is_sub_map:1, /* Is "object" a submap? */ 107 /* Only in sharing maps: */ 108 copy_on_write:1,/* is data copy-on-write */ 109 needs_copy:1; /* does object need to be copied */ 110 /* Only in task maps: */ 111 vm_prot_t protection; /* protection code */ 112 vm_prot_t max_protection; /* maximum protection */ 113 vm_inherit_t inheritance; /* inheritance */ 114 int wired_count; /* can be paged if = 0 */ 115 }; 116 117 /* 118 * Maps are doubly-linked lists of map entries, kept sorted 119 * by address. A single hint is provided to start 120 * searches again from the last successful search, 121 * insertion, or removal. 122 */ 123 struct vm_map { 124 struct pmap * pmap; /* Physical map */ 125 lock_data_t lock; /* Lock for map data */ 126 struct vm_map_entry header; /* List of entries */ 127 int nentries; /* Number of entries */ 128 vm_size_t size; /* virtual size */ 129 boolean_t is_main_map; /* Am I a main map? */ 130 int ref_count; /* Reference count */ 131 simple_lock_data_t ref_lock; /* Lock for ref_count field */ 132 vm_map_entry_t hint; /* hint for quick lookups */ 133 simple_lock_data_t hint_lock; /* lock for hint storage */ 134 vm_map_entry_t first_free; /* First free space hint */ 135 boolean_t entries_pageable; /* map entries pageable?? */ 136 unsigned int timestamp; /* Version number */ 137 #define min_offset header.start 138 #define max_offset header.end 139 }; 140 141 /* 142 * Map versions are used to validate a previous lookup attempt. 143 * 144 * Since lookup operations may involve both a main map and 145 * a sharing map, it is necessary to have a timestamp from each. 146 * [If the main map timestamp has changed, the share_map and 147 * associated timestamp are no longer valid; the map version 148 * does not include a reference for the imbedded share_map.] 149 */ 150 typedef struct { 151 int main_timestamp; 152 vm_map_t share_map; 153 int share_timestamp; 154 } vm_map_version_t; 155 156 /* 157 * Macros: vm_map_lock, etc. 158 * Function: 159 * Perform locking on the data portion of a map. 160 */ 161 162 #define vm_map_lock(map) { \ 163 lock_write(&(map)->lock); \ 164 (map)->timestamp++; \ 165 } 166 #define vm_map_unlock(map) lock_write_done(&(map)->lock) 167 #define vm_map_lock_read(map) lock_read(&(map)->lock) 168 #define vm_map_unlock_read(map) lock_read_done(&(map)->lock) 169 170 /* 171 * Functions implemented as macros 172 */ 173 #define vm_map_min(map) ((map)->min_offset) 174 #define vm_map_max(map) ((map)->max_offset) 175 #define vm_map_pmap(map) ((map)->pmap) 176 177 /* XXX: number of kernel maps and entries to statically allocate */ 178 #define MAX_KMAP 10 179 #define MAX_KMAPENT 128 180 181 #ifdef KERNEL 182 boolean_t vm_map_check_protection __P((vm_map_t, 183 vm_offset_t, vm_offset_t, vm_prot_t)); 184 int vm_map_copy __P((vm_map_t, vm_map_t, vm_offset_t, 185 vm_size_t, vm_offset_t, boolean_t, boolean_t)); 186 void vm_map_copy_entry __P((vm_map_t, 187 vm_map_t, vm_map_entry_t, vm_map_entry_t)); 188 struct pmap; 189 vm_map_t vm_map_create __P((struct pmap *, 190 vm_offset_t, vm_offset_t, boolean_t)); 191 void vm_map_deallocate __P((vm_map_t)); 192 int vm_map_delete __P((vm_map_t, vm_offset_t, vm_offset_t)); 193 vm_map_entry_t vm_map_entry_create __P((vm_map_t)); 194 void vm_map_entry_delete __P((vm_map_t, vm_map_entry_t)); 195 void vm_map_entry_dispose __P((vm_map_t, vm_map_entry_t)); 196 void vm_map_entry_unwire __P((vm_map_t, vm_map_entry_t)); 197 int vm_map_find __P((vm_map_t, vm_object_t, 198 vm_offset_t, vm_offset_t *, vm_size_t, boolean_t)); 199 int vm_map_findspace __P((vm_map_t, 200 vm_offset_t, vm_size_t, vm_offset_t *)); 201 int vm_map_inherit __P((vm_map_t, 202 vm_offset_t, vm_offset_t, vm_inherit_t)); 203 void vm_map_init __P((struct vm_map *, 204 vm_offset_t, vm_offset_t, boolean_t)); 205 int vm_map_insert __P((vm_map_t, 206 vm_object_t, vm_offset_t, vm_offset_t, vm_offset_t)); 207 int vm_map_lookup __P((vm_map_t *, vm_offset_t, vm_prot_t, 208 vm_map_entry_t *, vm_object_t *, vm_offset_t *, vm_prot_t *, 209 boolean_t *, boolean_t *)); 210 void vm_map_lookup_done __P((vm_map_t, vm_map_entry_t)); 211 boolean_t vm_map_lookup_entry __P((vm_map_t, 212 vm_offset_t, vm_map_entry_t *)); 213 int vm_map_pageable __P((vm_map_t, 214 vm_offset_t, vm_offset_t, boolean_t)); 215 int vm_map_clean __P((vm_map_t, 216 vm_offset_t, vm_offset_t, boolean_t, boolean_t)); 217 void vm_map_print __P((vm_map_t, boolean_t)); 218 int vm_map_protect __P((vm_map_t, 219 vm_offset_t, vm_offset_t, vm_prot_t, boolean_t)); 220 void vm_map_reference __P((vm_map_t)); 221 int vm_map_remove __P((vm_map_t, vm_offset_t, vm_offset_t)); 222 void vm_map_simplify __P((vm_map_t, vm_offset_t)); 223 void vm_map_simplify_entry __P((vm_map_t, vm_map_entry_t)); 224 void vm_map_startup __P((void)); 225 int vm_map_submap __P((vm_map_t, 226 vm_offset_t, vm_offset_t, vm_map_t)); 227 #endif 228 #endif /* _VM_MAP_ */ 229