2 * SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
4 * Copyright (c) 1991, 1993
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7 * This code is derived from software contributed to Berkeley by
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)vm_map.h 8.9 (Berkeley) 5/17/95
37 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
38 * All rights reserved.
40 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
42 * Permission to use, copy, modify and distribute this software and
43 * its documentation is hereby granted, provided that both the copyright
44 * notice and this permission notice appear in all copies of the
45 * software, derivative works or modified versions, and any portions
46 * thereof, and that both notices appear in supporting documentation.
48 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
49 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
50 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
52 * Carnegie Mellon requests users of this software to return to
54 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
55 * School of Computer Science
56 * Carnegie Mellon University
57 * Pittsburgh PA 15213-3890
59 * any improvements or extensions that they make and grant Carnegie the
60 * rights to redistribute these changes.
66 * Virtual memory map module definitions.
73 #include <sys/_mutex.h>
78 * vm_map_t the high-level address map data structure.
79 * vm_map_entry_t an entry in an address map.
82 typedef u_char vm_flags_t;
83 typedef u_int vm_eflags_t;
86 * Objects which live in maps may be either VM objects, or
87 * another map (called a "sharing map") which denotes read-write
88 * sharing with other maps.
91 struct vm_object *vm_object; /* object object */
92 struct vm_map *sub_map; /* belongs to another map */
96 * Address map entries consist of start and end addresses,
97 * a VM object (or sharing map) and offset into that object,
98 * and user-exported inheritance and protection information.
99 * Also included is control information for virtual copy operations.
101 struct vm_map_entry {
102 struct vm_map_entry *prev; /* previous entry */
103 struct vm_map_entry *next; /* next entry */
104 struct vm_map_entry *left; /* left child in binary search tree */
105 struct vm_map_entry *right; /* right child in binary search tree */
106 vm_offset_t start; /* start address */
107 vm_offset_t end; /* end address */
108 vm_offset_t next_read; /* vaddr of the next sequential read */
109 vm_size_t adj_free; /* amount of adjacent free space */
110 vm_size_t max_free; /* max free space in subtree */
111 union vm_map_object object; /* object I point to */
112 vm_ooffset_t offset; /* offset into object */
113 vm_eflags_t eflags; /* map entry flags */
114 vm_prot_t protection; /* protection code */
115 vm_prot_t max_protection; /* maximum protection */
116 vm_inherit_t inheritance; /* inheritance */
117 uint8_t read_ahead; /* pages in the read-ahead window */
118 int wired_count; /* can be paged if = 0 */
119 struct ucred *cred; /* tmp storage for creator ref */
120 struct thread *wiring_thread;
123 #define MAP_ENTRY_NOSYNC 0x0001
124 #define MAP_ENTRY_IS_SUB_MAP 0x0002
125 #define MAP_ENTRY_COW 0x0004
126 #define MAP_ENTRY_NEEDS_COPY 0x0008
127 #define MAP_ENTRY_NOFAULT 0x0010
128 #define MAP_ENTRY_USER_WIRED 0x0020
130 #define MAP_ENTRY_BEHAV_NORMAL 0x0000 /* default behavior */
131 #define MAP_ENTRY_BEHAV_SEQUENTIAL 0x0040 /* expect sequential access */
132 #define MAP_ENTRY_BEHAV_RANDOM 0x0080 /* expect random access */
133 #define MAP_ENTRY_BEHAV_RESERVED 0x00C0 /* future use */
135 #define MAP_ENTRY_BEHAV_MASK 0x00C0
137 #define MAP_ENTRY_IN_TRANSITION 0x0100 /* entry being changed */
138 #define MAP_ENTRY_NEEDS_WAKEUP 0x0200 /* waiters in transition */
139 #define MAP_ENTRY_NOCOREDUMP 0x0400 /* don't include in a core */
141 #define MAP_ENTRY_GROWS_DOWN 0x1000 /* Top-down stacks */
142 #define MAP_ENTRY_GROWS_UP 0x2000 /* Bottom-up stacks */
144 #define MAP_ENTRY_WIRE_SKIPPED 0x4000
145 #define MAP_ENTRY_VN_WRITECNT 0x8000 /* writeable vnode mapping */
146 #define MAP_ENTRY_GUARD 0x10000
147 #define MAP_ENTRY_STACK_GAP_DN 0x20000
148 #define MAP_ENTRY_STACK_GAP_UP 0x40000
149 #define MAP_ENTRY_HEADER 0x80000
152 static __inline u_char
153 vm_map_entry_behavior(vm_map_entry_t entry)
155 return (entry->eflags & MAP_ENTRY_BEHAV_MASK);
159 vm_map_entry_user_wired_count(vm_map_entry_t entry)
161 if (entry->eflags & MAP_ENTRY_USER_WIRED)
167 vm_map_entry_system_wired_count(vm_map_entry_t entry)
169 return (entry->wired_count - vm_map_entry_user_wired_count(entry));
174 * A map is a set of map entries. These map entries are
175 * organized both as a binary search tree and as a doubly-linked
176 * list. Both structures are ordered based upon the start and
177 * end addresses contained within each map entry.
179 * Sleator and Tarjan's top-down splay algorithm is employed to
180 * control height imbalance in the binary search tree.
182 * The map's min offset value is stored in map->header.end, and
183 * its max offset value is stored in map->header.start. These
184 * values act as sentinels for any forward or backward address
185 * scan of the list. The map header has a special value for the
186 * eflags field, MAP_ENTRY_HEADER, that is set initially, is
187 * never changed, and prevents an eflags match of the header
188 * with any other map entry.
191 * (c) const until freed
194 struct vm_map_entry header; /* List of entries */
195 struct sx lock; /* Lock for map data */
196 struct mtx system_mtx;
197 int nentries; /* Number of entries */
198 vm_size_t size; /* virtual size */
199 u_int timestamp; /* Version number */
201 u_char system_map; /* (c) Am I a system map? */
202 vm_flags_t flags; /* flags for this vm_map */
203 vm_map_entry_t root; /* Root of a binary search tree */
204 pmap_t pmap; /* (c) Physical map */
205 vm_offset_t anon_loc;
212 #define MAP_WIREFUTURE 0x01 /* wire all future pages */
213 #define MAP_BUSY_WAKEUP 0x02
214 #define MAP_IS_SUB_MAP 0x04 /* has parent */
215 #define MAP_ASLR 0x08 /* enabled ASLR */
216 #define MAP_ASLR_IGNSTART 0x10
219 #if defined(KLD_MODULE) && !defined(KLD_TIED)
220 #define vm_map_max(map) vm_map_max_KBI((map))
221 #define vm_map_min(map) vm_map_min_KBI((map))
222 #define vm_map_pmap(map) vm_map_pmap_KBI((map))
224 static __inline vm_offset_t
225 vm_map_max(const struct vm_map *map)
228 return (map->header.start);
231 static __inline vm_offset_t
232 vm_map_min(const struct vm_map *map)
235 return (map->header.end);
238 static __inline pmap_t
239 vm_map_pmap(vm_map_t map)
245 vm_map_modflags(vm_map_t map, vm_flags_t set, vm_flags_t clear)
247 map->flags = (map->flags | set) & ~clear;
249 #endif /* KLD_MODULE */
253 * Shareable process virtual address space.
256 * (c) const until freed
259 struct vm_map vm_map; /* VM address map */
260 struct shmmap_state *vm_shm; /* SYS5 shared memory private data XXX */
261 segsz_t vm_swrss; /* resident set size before last swap */
262 segsz_t vm_tsize; /* text size (pages) XXX */
263 segsz_t vm_dsize; /* data size (pages) XXX */
264 segsz_t vm_ssize; /* stack size (pages) */
265 caddr_t vm_taddr; /* (c) user virtual address of text */
266 caddr_t vm_daddr; /* (c) user virtual address of data */
267 caddr_t vm_maxsaddr; /* user VA at max stack growth */
268 volatile int vm_refcnt; /* number of references */
270 * Keep the PMAP last, so that CPU-specific variations of that
271 * structure on a single architecture don't result in offset
272 * variations of the machine-independent fields in the vmspace.
274 struct pmap vm_pmap; /* private physical map */
278 static __inline pmap_t
279 vmspace_pmap(struct vmspace *vmspace)
281 return &vmspace->vm_pmap;
287 * Macros: vm_map_lock, etc.
289 * Perform locking on the data portion of a map. Note that
290 * these macros mimic procedure calls returning void. The
291 * semicolon is supplied by the user of these macros, not
292 * by the macros themselves. The macros can safely be used
293 * as unbraced elements in a higher level statement.
296 void _vm_map_lock(vm_map_t map, const char *file, int line);
297 void _vm_map_unlock(vm_map_t map, const char *file, int line);
298 int _vm_map_unlock_and_wait(vm_map_t map, int timo, const char *file, int line);
299 void _vm_map_lock_read(vm_map_t map, const char *file, int line);
300 void _vm_map_unlock_read(vm_map_t map, const char *file, int line);
301 int _vm_map_trylock(vm_map_t map, const char *file, int line);
302 int _vm_map_trylock_read(vm_map_t map, const char *file, int line);
303 int _vm_map_lock_upgrade(vm_map_t map, const char *file, int line);
304 void _vm_map_lock_downgrade(vm_map_t map, const char *file, int line);
305 int vm_map_locked(vm_map_t map);
306 void vm_map_wakeup(vm_map_t map);
307 void vm_map_busy(vm_map_t map);
308 void vm_map_unbusy(vm_map_t map);
309 void vm_map_wait_busy(vm_map_t map);
310 vm_offset_t vm_map_max_KBI(const struct vm_map *map);
311 vm_offset_t vm_map_min_KBI(const struct vm_map *map);
312 pmap_t vm_map_pmap_KBI(vm_map_t map);
314 #define vm_map_lock(map) _vm_map_lock(map, LOCK_FILE, LOCK_LINE)
315 #define vm_map_unlock(map) _vm_map_unlock(map, LOCK_FILE, LOCK_LINE)
316 #define vm_map_unlock_and_wait(map, timo) \
317 _vm_map_unlock_and_wait(map, timo, LOCK_FILE, LOCK_LINE)
318 #define vm_map_lock_read(map) _vm_map_lock_read(map, LOCK_FILE, LOCK_LINE)
319 #define vm_map_unlock_read(map) _vm_map_unlock_read(map, LOCK_FILE, LOCK_LINE)
320 #define vm_map_trylock(map) _vm_map_trylock(map, LOCK_FILE, LOCK_LINE)
321 #define vm_map_trylock_read(map) \
322 _vm_map_trylock_read(map, LOCK_FILE, LOCK_LINE)
323 #define vm_map_lock_upgrade(map) \
324 _vm_map_lock_upgrade(map, LOCK_FILE, LOCK_LINE)
325 #define vm_map_lock_downgrade(map) \
326 _vm_map_lock_downgrade(map, LOCK_FILE, LOCK_LINE)
328 long vmspace_resident_count(struct vmspace *vmspace);
332 /* XXX: number of kernel maps to statically allocate */
336 * Copy-on-write flags for vm_map operations
338 #define MAP_INHERIT_SHARE 0x0001
339 #define MAP_COPY_ON_WRITE 0x0002
340 #define MAP_NOFAULT 0x0004
341 #define MAP_PREFAULT 0x0008
342 #define MAP_PREFAULT_PARTIAL 0x0010
343 #define MAP_DISABLE_SYNCER 0x0020
344 #define MAP_CHECK_EXCL 0x0040
345 #define MAP_CREATE_GUARD 0x0080
346 #define MAP_DISABLE_COREDUMP 0x0100
347 #define MAP_PREFAULT_MADVISE 0x0200 /* from (user) madvise request */
348 #define MAP_VN_WRITECOUNT 0x0400
349 #define MAP_REMAP 0x0800
350 #define MAP_STACK_GROWS_DOWN 0x1000
351 #define MAP_STACK_GROWS_UP 0x2000
352 #define MAP_ACC_CHARGED 0x4000
353 #define MAP_ACC_NO_CHARGE 0x8000
354 #define MAP_CREATE_STACK_GAP_UP 0x10000
355 #define MAP_CREATE_STACK_GAP_DN 0x20000
358 * vm_fault option flags
360 #define VM_FAULT_NORMAL 0 /* Nothing special */
361 #define VM_FAULT_WIRE 1 /* Wire the mapped page */
362 #define VM_FAULT_DIRTY 2 /* Dirty the page; use w/VM_PROT_COPY */
365 * Initially, mappings are slightly sequential. The maximum window size must
366 * account for the map entry's "read_ahead" field being defined as an uint8_t.
368 #define VM_FAULT_READ_AHEAD_MIN 7
369 #define VM_FAULT_READ_AHEAD_INIT 15
370 #define VM_FAULT_READ_AHEAD_MAX min(atop(MAXPHYS) - 1, UINT8_MAX)
373 * The following "find_space" options are supported by vm_map_find().
375 * For VMFS_ALIGNED_SPACE, the desired alignment is specified to
376 * the macro argument as log base 2 of the desired alignment.
378 #define VMFS_NO_SPACE 0 /* don't find; use the given range */
379 #define VMFS_ANY_SPACE 1 /* find a range with any alignment */
380 #define VMFS_OPTIMAL_SPACE 2 /* find a range with optimal alignment*/
381 #define VMFS_SUPER_SPACE 3 /* find a superpage-aligned range */
382 #define VMFS_ALIGNED_SPACE(x) ((x) << 8) /* find a range with fixed alignment */
385 * vm_map_wire and vm_map_unwire option flags
387 #define VM_MAP_WIRE_SYSTEM 0 /* wiring in a kernel map */
388 #define VM_MAP_WIRE_USER 1 /* wiring in a user map */
390 #define VM_MAP_WIRE_NOHOLES 0 /* region must not have holes */
391 #define VM_MAP_WIRE_HOLESOK 2 /* region may have holes */
393 #define VM_MAP_WIRE_WRITE 4 /* Validate writable. */
396 boolean_t vm_map_check_protection (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t);
397 vm_map_t vm_map_create(pmap_t, vm_offset_t, vm_offset_t);
398 int vm_map_delete(vm_map_t, vm_offset_t, vm_offset_t);
399 int vm_map_find(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, vm_size_t,
400 vm_offset_t, int, vm_prot_t, vm_prot_t, int);
401 int vm_map_find_min(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *,
402 vm_size_t, vm_offset_t, vm_offset_t, int, vm_prot_t, vm_prot_t, int);
403 int vm_map_fixed(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t, vm_size_t,
404 vm_prot_t, vm_prot_t, int);
405 int vm_map_findspace (vm_map_t, vm_offset_t, vm_size_t, vm_offset_t *);
406 int vm_map_inherit (vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t);
407 void vm_map_init(vm_map_t, pmap_t, vm_offset_t, vm_offset_t);
408 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);
409 int vm_map_lookup (vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
410 vm_pindex_t *, vm_prot_t *, boolean_t *);
411 int vm_map_lookup_locked(vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
412 vm_pindex_t *, vm_prot_t *, boolean_t *);
413 void vm_map_lookup_done (vm_map_t, vm_map_entry_t);
414 boolean_t vm_map_lookup_entry (vm_map_t, vm_offset_t, vm_map_entry_t *);
415 int vm_map_protect (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t);
416 int vm_map_remove (vm_map_t, vm_offset_t, vm_offset_t);
417 void vm_map_simplify_entry(vm_map_t map, vm_map_entry_t entry);
418 void vm_map_startup (void);
419 int vm_map_submap (vm_map_t, vm_offset_t, vm_offset_t, vm_map_t);
420 int vm_map_sync(vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t);
421 int vm_map_madvise (vm_map_t, vm_offset_t, vm_offset_t, int);
422 int vm_map_stack (vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int);
423 int vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
425 int vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end,
427 long vmspace_swap_count(struct vmspace *vmspace);
429 #endif /* _VM_MAP_ */