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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)vm_map.h 8.9 (Berkeley) 5/17/95 33 * 34 * 35 * Copyright (c) 1987, 1990 Carnegie-Mellon University. 36 * All rights reserved. 37 * 38 * Authors: Avadis Tevanian, Jr., Michael Wayne Young 39 * 40 * Permission to use, copy, modify and distribute this software and 41 * its documentation is hereby granted, provided that both the copyright 42 * notice and this permission notice appear in all copies of the 43 * software, derivative works or modified versions, and any portions 44 * thereof, and that both notices appear in supporting documentation. 45 * 46 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 47 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 48 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 49 * 50 * Carnegie Mellon requests users of this software to return to 51 * 52 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 53 * School of Computer Science 54 * Carnegie Mellon University 55 * Pittsburgh PA 15213-3890 56 * 57 * any improvements or extensions that they make and grant Carnegie the 58 * rights to redistribute these changes. 59 * 60 * $FreeBSD$ 61 */ 62 63 /* 64 * Virtual memory map module definitions. 65 */ 66 #ifndef _VM_MAP_ 67 #define _VM_MAP_ 68 69 #include <sys/lock.h> 70 #include <sys/sx.h> 71 #include <sys/_mutex.h> 72 73 /* 74 * Types defined: 75 * 76 * vm_map_t the high-level address map data structure. 77 * vm_map_entry_t an entry in an address map. 78 */ 79 80 typedef u_char vm_flags_t; 81 typedef u_int vm_eflags_t; 82 83 /* 84 * Objects which live in maps may be either VM objects, or 85 * another map (called a "sharing map") which denotes read-write 86 * sharing with other maps. 87 */ 88 union vm_map_object { 89 struct vm_object *vm_object; /* object object */ 90 struct vm_map *sub_map; /* belongs to another map */ 91 }; 92 93 /* 94 * Address map entries consist of start and end addresses, 95 * a VM object (or sharing map) and offset into that object, 96 * and user-exported inheritance and protection information. 97 * Also included is control information for virtual copy operations. 98 */ 99 struct vm_map_entry { 100 struct vm_map_entry *prev; /* previous entry */ 101 struct vm_map_entry *next; /* next entry */ 102 struct vm_map_entry *left; /* left child in binary search tree */ 103 struct vm_map_entry *right; /* right child in binary search tree */ 104 vm_offset_t start; /* start address */ 105 vm_offset_t end; /* end address */ 106 vm_offset_t next_read; /* vaddr of the next sequential read */ 107 vm_size_t adj_free; /* amount of adjacent free space */ 108 vm_size_t max_free; /* max free space in subtree */ 109 union vm_map_object object; /* object I point to */ 110 vm_ooffset_t offset; /* offset into object */ 111 vm_eflags_t eflags; /* map entry flags */ 112 vm_prot_t protection; /* protection code */ 113 vm_prot_t max_protection; /* maximum protection */ 114 vm_inherit_t inheritance; /* inheritance */ 115 uint8_t read_ahead; /* pages in the read-ahead window */ 116 int wired_count; /* can be paged if = 0 */ 117 struct ucred *cred; /* tmp storage for creator ref */ 118 struct thread *wiring_thread; 119 }; 120 121 #define MAP_ENTRY_NOSYNC 0x0001 122 #define MAP_ENTRY_IS_SUB_MAP 0x0002 123 #define MAP_ENTRY_COW 0x0004 124 #define MAP_ENTRY_NEEDS_COPY 0x0008 125 #define MAP_ENTRY_NOFAULT 0x0010 126 #define MAP_ENTRY_USER_WIRED 0x0020 127 128 #define MAP_ENTRY_BEHAV_NORMAL 0x0000 /* default behavior */ 129 #define MAP_ENTRY_BEHAV_SEQUENTIAL 0x0040 /* expect sequential access */ 130 #define MAP_ENTRY_BEHAV_RANDOM 0x0080 /* expect random access */ 131 #define MAP_ENTRY_BEHAV_RESERVED 0x00C0 /* future use */ 132 133 #define MAP_ENTRY_BEHAV_MASK 0x00C0 134 135 #define MAP_ENTRY_IN_TRANSITION 0x0100 /* entry being changed */ 136 #define MAP_ENTRY_NEEDS_WAKEUP 0x0200 /* waiters in transition */ 137 #define MAP_ENTRY_NOCOREDUMP 0x0400 /* don't include in a core */ 138 139 #define MAP_ENTRY_GROWS_DOWN 0x1000 /* Top-down stacks */ 140 #define MAP_ENTRY_GROWS_UP 0x2000 /* Bottom-up stacks */ 141 142 #define MAP_ENTRY_WIRE_SKIPPED 0x4000 143 #define MAP_ENTRY_VN_WRITECNT 0x8000 /* writeable vnode mapping */ 144 #define MAP_ENTRY_GUARD 0x10000 145 #define MAP_ENTRY_STACK_GAP_DN 0x20000 146 #define MAP_ENTRY_STACK_GAP_UP 0x40000 147 148 #ifdef _KERNEL 149 static __inline u_char 150 vm_map_entry_behavior(vm_map_entry_t entry) 151 { 152 return (entry->eflags & MAP_ENTRY_BEHAV_MASK); 153 } 154 155 static __inline int 156 vm_map_entry_user_wired_count(vm_map_entry_t entry) 157 { 158 if (entry->eflags & MAP_ENTRY_USER_WIRED) 159 return (1); 160 return (0); 161 } 162 163 static __inline int 164 vm_map_entry_system_wired_count(vm_map_entry_t entry) 165 { 166 return (entry->wired_count - vm_map_entry_user_wired_count(entry)); 167 } 168 #endif /* _KERNEL */ 169 170 /* 171 * A map is a set of map entries. These map entries are 172 * organized both as a binary search tree and as a doubly-linked 173 * list. Both structures are ordered based upon the start and 174 * end addresses contained within each map entry. Sleator and 175 * Tarjan's top-down splay algorithm is employed to control 176 * height imbalance in the binary search tree. 177 * 178 * List of locks 179 * (c) const until freed 180 */ 181 struct vm_map { 182 struct vm_map_entry header; /* List of entries */ 183 struct sx lock; /* Lock for map data */ 184 struct mtx system_mtx; 185 int nentries; /* Number of entries */ 186 vm_size_t size; /* virtual size */ 187 u_int timestamp; /* Version number */ 188 u_char needs_wakeup; 189 u_char system_map; /* (c) Am I a system map? */ 190 vm_flags_t flags; /* flags for this vm_map */ 191 vm_map_entry_t root; /* Root of a binary search tree */ 192 pmap_t pmap; /* (c) Physical map */ 193 #define min_offset header.start /* (c) */ 194 #define max_offset header.end /* (c) */ 195 int busy; 196 }; 197 198 /* 199 * vm_flags_t values 200 */ 201 #define MAP_WIREFUTURE 0x01 /* wire all future pages */ 202 #define MAP_BUSY_WAKEUP 0x02 203 204 #ifdef _KERNEL 205 static __inline vm_offset_t 206 vm_map_max(const struct vm_map *map) 207 { 208 return (map->max_offset); 209 } 210 211 static __inline vm_offset_t 212 vm_map_min(const struct vm_map *map) 213 { 214 return (map->min_offset); 215 } 216 217 static __inline pmap_t 218 vm_map_pmap(vm_map_t map) 219 { 220 return (map->pmap); 221 } 222 223 static __inline void 224 vm_map_modflags(vm_map_t map, vm_flags_t set, vm_flags_t clear) 225 { 226 map->flags = (map->flags | set) & ~clear; 227 } 228 #endif /* _KERNEL */ 229 230 /* 231 * Shareable process virtual address space. 232 * 233 * List of locks 234 * (c) const until freed 235 */ 236 struct vmspace { 237 struct vm_map vm_map; /* VM address map */ 238 struct shmmap_state *vm_shm; /* SYS5 shared memory private data XXX */ 239 segsz_t vm_swrss; /* resident set size before last swap */ 240 segsz_t vm_tsize; /* text size (pages) XXX */ 241 segsz_t vm_dsize; /* data size (pages) XXX */ 242 segsz_t vm_ssize; /* stack size (pages) */ 243 caddr_t vm_taddr; /* (c) user virtual address of text */ 244 caddr_t vm_daddr; /* (c) user virtual address of data */ 245 caddr_t vm_maxsaddr; /* user VA at max stack growth */ 246 volatile int vm_refcnt; /* number of references */ 247 /* 248 * Keep the PMAP last, so that CPU-specific variations of that 249 * structure on a single architecture don't result in offset 250 * variations of the machine-independent fields in the vmspace. 251 */ 252 struct pmap vm_pmap; /* private physical map */ 253 }; 254 255 #ifdef _KERNEL 256 static __inline pmap_t 257 vmspace_pmap(struct vmspace *vmspace) 258 { 259 return &vmspace->vm_pmap; 260 } 261 #endif /* _KERNEL */ 262 263 #ifdef _KERNEL 264 /* 265 * Macros: vm_map_lock, etc. 266 * Function: 267 * Perform locking on the data portion of a map. Note that 268 * these macros mimic procedure calls returning void. The 269 * semicolon is supplied by the user of these macros, not 270 * by the macros themselves. The macros can safely be used 271 * as unbraced elements in a higher level statement. 272 */ 273 274 void _vm_map_lock(vm_map_t map, const char *file, int line); 275 void _vm_map_unlock(vm_map_t map, const char *file, int line); 276 int _vm_map_unlock_and_wait(vm_map_t map, int timo, const char *file, int line); 277 void _vm_map_lock_read(vm_map_t map, const char *file, int line); 278 void _vm_map_unlock_read(vm_map_t map, const char *file, int line); 279 int _vm_map_trylock(vm_map_t map, const char *file, int line); 280 int _vm_map_trylock_read(vm_map_t map, const char *file, int line); 281 int _vm_map_lock_upgrade(vm_map_t map, const char *file, int line); 282 void _vm_map_lock_downgrade(vm_map_t map, const char *file, int line); 283 int vm_map_locked(vm_map_t map); 284 void vm_map_wakeup(vm_map_t map); 285 void vm_map_busy(vm_map_t map); 286 void vm_map_unbusy(vm_map_t map); 287 void vm_map_wait_busy(vm_map_t map); 288 289 #define vm_map_lock(map) _vm_map_lock(map, LOCK_FILE, LOCK_LINE) 290 #define vm_map_unlock(map) _vm_map_unlock(map, LOCK_FILE, LOCK_LINE) 291 #define vm_map_unlock_and_wait(map, timo) \ 292 _vm_map_unlock_and_wait(map, timo, LOCK_FILE, LOCK_LINE) 293 #define vm_map_lock_read(map) _vm_map_lock_read(map, LOCK_FILE, LOCK_LINE) 294 #define vm_map_unlock_read(map) _vm_map_unlock_read(map, LOCK_FILE, LOCK_LINE) 295 #define vm_map_trylock(map) _vm_map_trylock(map, LOCK_FILE, LOCK_LINE) 296 #define vm_map_trylock_read(map) \ 297 _vm_map_trylock_read(map, LOCK_FILE, LOCK_LINE) 298 #define vm_map_lock_upgrade(map) \ 299 _vm_map_lock_upgrade(map, LOCK_FILE, LOCK_LINE) 300 #define vm_map_lock_downgrade(map) \ 301 _vm_map_lock_downgrade(map, LOCK_FILE, LOCK_LINE) 302 303 long vmspace_resident_count(struct vmspace *vmspace); 304 #endif /* _KERNEL */ 305 306 307 /* XXX: number of kernel maps to statically allocate */ 308 #define MAX_KMAP 10 309 310 /* 311 * Copy-on-write flags for vm_map operations 312 */ 313 #define MAP_INHERIT_SHARE 0x0001 314 #define MAP_COPY_ON_WRITE 0x0002 315 #define MAP_NOFAULT 0x0004 316 #define MAP_PREFAULT 0x0008 317 #define MAP_PREFAULT_PARTIAL 0x0010 318 #define MAP_DISABLE_SYNCER 0x0020 319 #define MAP_CHECK_EXCL 0x0040 320 #define MAP_CREATE_GUARD 0x0080 321 #define MAP_DISABLE_COREDUMP 0x0100 322 #define MAP_PREFAULT_MADVISE 0x0200 /* from (user) madvise request */ 323 #define MAP_VN_WRITECOUNT 0x0400 324 #define MAP_STACK_GROWS_DOWN 0x1000 325 #define MAP_STACK_GROWS_UP 0x2000 326 #define MAP_ACC_CHARGED 0x4000 327 #define MAP_ACC_NO_CHARGE 0x8000 328 #define MAP_CREATE_STACK_GAP_UP 0x10000 329 #define MAP_CREATE_STACK_GAP_DN 0x20000 330 331 /* 332 * vm_fault option flags 333 */ 334 #define VM_FAULT_NORMAL 0 /* Nothing special */ 335 #define VM_FAULT_WIRE 1 /* Wire the mapped page */ 336 #define VM_FAULT_DIRTY 2 /* Dirty the page; use w/VM_PROT_COPY */ 337 338 /* 339 * Initially, mappings are slightly sequential. The maximum window size must 340 * account for the map entry's "read_ahead" field being defined as an uint8_t. 341 */ 342 #define VM_FAULT_READ_AHEAD_MIN 7 343 #define VM_FAULT_READ_AHEAD_INIT 15 344 #define VM_FAULT_READ_AHEAD_MAX min(atop(MAXPHYS) - 1, UINT8_MAX) 345 346 /* 347 * The following "find_space" options are supported by vm_map_find(). 348 * 349 * For VMFS_ALIGNED_SPACE, the desired alignment is specified to 350 * the macro argument as log base 2 of the desired alignment. 351 */ 352 #define VMFS_NO_SPACE 0 /* don't find; use the given range */ 353 #define VMFS_ANY_SPACE 1 /* find a range with any alignment */ 354 #define VMFS_OPTIMAL_SPACE 2 /* find a range with optimal alignment*/ 355 #define VMFS_SUPER_SPACE 3 /* find a superpage-aligned range */ 356 #define VMFS_ALIGNED_SPACE(x) ((x) << 8) /* find a range with fixed alignment */ 357 358 /* 359 * vm_map_wire and vm_map_unwire option flags 360 */ 361 #define VM_MAP_WIRE_SYSTEM 0 /* wiring in a kernel map */ 362 #define VM_MAP_WIRE_USER 1 /* wiring in a user map */ 363 364 #define VM_MAP_WIRE_NOHOLES 0 /* region must not have holes */ 365 #define VM_MAP_WIRE_HOLESOK 2 /* region may have holes */ 366 367 #define VM_MAP_WIRE_WRITE 4 /* Validate writable. */ 368 369 #ifdef _KERNEL 370 boolean_t vm_map_check_protection (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t); 371 vm_map_t vm_map_create(pmap_t, vm_offset_t, vm_offset_t); 372 int vm_map_delete(vm_map_t, vm_offset_t, vm_offset_t); 373 int vm_map_find(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, vm_size_t, 374 vm_offset_t, int, vm_prot_t, vm_prot_t, int); 375 int vm_map_find_min(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, 376 vm_size_t, vm_offset_t, vm_offset_t, int, vm_prot_t, vm_prot_t, int); 377 int vm_map_fixed(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t, vm_size_t, 378 vm_prot_t, vm_prot_t, int); 379 int vm_map_findspace (vm_map_t, vm_offset_t, vm_size_t, vm_offset_t *); 380 int vm_map_inherit (vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t); 381 void vm_map_init(vm_map_t, pmap_t, vm_offset_t, vm_offset_t); 382 int vm_map_insert (vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t, vm_offset_t, vm_prot_t, vm_prot_t, int); 383 int vm_map_lookup (vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *, 384 vm_pindex_t *, vm_prot_t *, boolean_t *); 385 int vm_map_lookup_locked(vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *, 386 vm_pindex_t *, vm_prot_t *, boolean_t *); 387 void vm_map_lookup_done (vm_map_t, vm_map_entry_t); 388 boolean_t vm_map_lookup_entry (vm_map_t, vm_offset_t, vm_map_entry_t *); 389 int vm_map_protect (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t); 390 int vm_map_remove (vm_map_t, vm_offset_t, vm_offset_t); 391 void vm_map_simplify_entry(vm_map_t map, vm_map_entry_t entry); 392 void vm_map_startup (void); 393 int vm_map_submap (vm_map_t, vm_offset_t, vm_offset_t, vm_map_t); 394 int vm_map_sync(vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t); 395 int vm_map_madvise (vm_map_t, vm_offset_t, vm_offset_t, int); 396 int vm_map_stack (vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int); 397 int vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end, 398 int flags); 399 int vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end, 400 int flags); 401 long vmspace_swap_count(struct vmspace *vmspace); 402 #endif /* _KERNEL */ 403 #endif /* _VM_MAP_ */ 404