2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * The Mach Operating System project at Carnegie-Mellon University.
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18 * This product includes software developed by the University of
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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
36 * @(#)vm_map.h 8.9 (Berkeley) 5/17/95
39 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
40 * All rights reserved.
42 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
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.
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.
54 * Carnegie Mellon requests users of this software to return to
56 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
57 * School of Computer Science
58 * Carnegie Mellon University
59 * Pittsburgh PA 15213-3890
61 * any improvements or extensions that they make and grant Carnegie the
62 * rights to redistribute these changes.
64 * $FreeBSD: src/sys/vm/vm_map.h,v 1.54.2.5 2003/01/13 22:51:17 dillon Exp $
68 * Virtual memory map module definitions.
77 * vm_map_t the high-level address map data structure.
78 * vm_map_entry_t an entry in an address map.
81 typedef u_int vm_eflags_t;
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.
90 struct vm_object *vm_object; /* object object */
91 struct vm_map *sub_map; /* belongs to another map */
95 * Address map entries consist of start and end addresses,
96 * a VM object (or sharing map) and offset into that object,
97 * and user-exported inheritance and protection information.
98 * Also included is control information for virtual copy operations.
100 struct vm_map_entry {
101 struct vm_map_entry *prev; /* previous entry */
102 struct vm_map_entry *next; /* next entry */
103 vm_offset_t start; /* start address */
104 vm_offset_t end; /* end address */
105 vm_offset_t avail_ssize; /* amt can grow if this is a stack */
106 union vm_map_object object; /* object I point to */
107 vm_ooffset_t offset; /* offset into object */
108 vm_eflags_t eflags; /* map entry flags */
109 /* Only in task maps: */
110 vm_prot_t protection; /* protection code */
111 vm_prot_t max_protection; /* maximum protection */
112 vm_inherit_t inheritance; /* inheritance */
113 int wired_count; /* can be paged if = 0 */
114 vm_pindex_t lastr; /* last read */
117 #define MAP_ENTRY_NOSYNC 0x0001
118 #define MAP_ENTRY_IS_SUB_MAP 0x0002
119 #define MAP_ENTRY_COW 0x0004
120 #define MAP_ENTRY_NEEDS_COPY 0x0008
121 #define MAP_ENTRY_NOFAULT 0x0010
122 #define MAP_ENTRY_USER_WIRED 0x0020
124 #define MAP_ENTRY_BEHAV_NORMAL 0x0000 /* default behavior */
125 #define MAP_ENTRY_BEHAV_SEQUENTIAL 0x0040 /* expect sequential access */
126 #define MAP_ENTRY_BEHAV_RANDOM 0x0080 /* expect random access */
127 #define MAP_ENTRY_BEHAV_RESERVED 0x00C0 /* future use */
129 #define MAP_ENTRY_BEHAV_MASK 0x00C0
131 #define MAP_ENTRY_IN_TRANSITION 0x0100 /* entry being changed */
132 #define MAP_ENTRY_NEEDS_WAKEUP 0x0200 /* waiter's in transition */
133 #define MAP_ENTRY_NOCOREDUMP 0x0400 /* don't include in a core */
136 * flags for vm_map_[un]clip_range()
138 #define MAP_CLIP_NO_HOLES 0x0001
140 static __inline u_char
141 vm_map_entry_behavior(struct vm_map_entry *entry)
143 return entry->eflags & MAP_ENTRY_BEHAV_MASK;
147 vm_map_entry_set_behavior(struct vm_map_entry *entry, u_char behavior)
149 entry->eflags = (entry->eflags & ~MAP_ENTRY_BEHAV_MASK) |
150 (behavior & MAP_ENTRY_BEHAV_MASK);
154 * Maps are doubly-linked lists of map entries, kept sorted
155 * by address. A single hint is provided to start
156 * searches again from the last successful search,
157 * insertion, or removal.
159 * Note: the lock structure cannot be the first element of vm_map
160 * because this can result in a running lockup between two or more
161 * system processes trying to kmem_alloc_wait() due to kmem_alloc_wait()
162 * and free tsleep/waking up 'map' and the underlying lockmgr also
163 * sleeping and waking up on 'map'. The lockup occurs when the map fills
164 * up. The 'exec' map, for example.
167 struct vm_map_entry header; /* List of entries */
168 struct lock lock; /* Lock for map data */
169 int nentries; /* Number of entries */
170 vm_size_t size; /* virtual size */
171 u_char system_map; /* Am I a system map? */
172 u_char infork; /* Am I in fork processing? */
173 vm_map_entry_t hint; /* hint for quick lookups */
174 unsigned int timestamp; /* Version number */
175 vm_map_entry_t first_free; /* First free space hint */
176 struct pmap *pmap; /* Physical map */
177 #define min_offset header.start
178 #define max_offset header.end
182 * Shareable process virtual address space.
183 * May eventually be merged with vm_map.
184 * Several fields are temporary (text, data stuff).
187 struct vm_map vm_map; /* VM address map */
188 struct pmap vm_pmap; /* private physical map */
189 int vm_refcnt; /* number of references */
190 caddr_t vm_shm; /* SYS5 shared memory private data XXX */
191 /* we copy from vm_startcopy to the end of the structure on fork */
192 #define vm_startcopy vm_rssize
193 segsz_t vm_rssize; /* current resident set size in pages */
194 segsz_t vm_swrss; /* resident set size before last swap */
195 segsz_t vm_tsize; /* text size (pages) XXX */
196 segsz_t vm_dsize; /* data size (pages) XXX */
197 segsz_t vm_ssize; /* stack size (pages) */
198 caddr_t vm_taddr; /* user virtual address of text XXX */
199 caddr_t vm_daddr; /* user virtual address of data XXX */
200 caddr_t vm_maxsaddr; /* user VA at max stack growth */
201 caddr_t vm_minsaddr; /* user VA at max stack growth */
202 int vm_exitingcnt; /* several procsses zombied in exit1 */
206 * Macros: vm_map_lock, etc.
208 * Perform locking on the data portion of a map. Note that
209 * these macros mimic procedure calls returning void. The
210 * semicolon is supplied by the user of these macros, not
211 * by the macros themselves. The macros can safely be used
212 * as unbraced elements in a higher level statement.
215 #define vm_map_lock_drain_interlock(map) \
217 lockmgr(&(map)->lock, LK_DRAIN|LK_INTERLOCK, \
218 &(map)->ref_lock, curproc); \
219 (map)->timestamp++; \
223 /* #define MAP_LOCK_DIAGNOSTIC 1 */
224 #ifdef MAP_LOCK_DIAGNOSTIC
225 #define vm_map_lock(map) \
227 printf ("locking map LK_EXCLUSIVE: 0x%x\n", map); \
228 if (lockmgr(&(map)->lock, LK_EXCLUSIVE, (void *)0, curproc) != 0) { \
229 panic("vm_map_lock: failed to get lock"); \
231 (map)->timestamp++; \
234 #define vm_map_lock(map) \
236 if (lockmgr(&(map)->lock, LK_EXCLUSIVE, (void *)0, curproc) != 0) { \
237 panic("vm_map_lock: failed to get lock"); \
239 (map)->timestamp++; \
243 #define vm_map_lock(map) \
245 lockmgr(&(map)->lock, LK_EXCLUSIVE, (void *)0, curproc); \
246 (map)->timestamp++; \
248 #endif /* DIAGNOSTIC */
250 #if defined(MAP_LOCK_DIAGNOSTIC)
251 #define vm_map_unlock(map) \
253 printf ("locking map LK_RELEASE: 0x%x\n", map); \
254 lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc); \
256 #define vm_map_lock_read(map) \
258 printf ("locking map LK_SHARED: 0x%x\n", map); \
259 lockmgr(&(map)->lock, LK_SHARED, (void *)0, curproc); \
261 #define vm_map_unlock_read(map) \
263 printf ("locking map LK_RELEASE: 0x%x\n", map); \
264 lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc); \
267 #define vm_map_unlock(map) \
268 lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc)
269 #define vm_map_lock_read(map) \
270 lockmgr(&(map)->lock, LK_SHARED, (void *)0, curproc)
271 #define vm_map_unlock_read(map) \
272 lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc)
275 static __inline__ int
276 _vm_map_lock_upgrade(vm_map_t map, struct proc *p) {
278 #if defined(MAP_LOCK_DIAGNOSTIC)
279 printf("locking map LK_EXCLUPGRADE: 0x%x\n", map);
281 error = lockmgr(&map->lock, LK_EXCLUPGRADE, (void *)0, p);
287 #define vm_map_lock_upgrade(map) _vm_map_lock_upgrade(map, curproc)
289 #if defined(MAP_LOCK_DIAGNOSTIC)
290 #define vm_map_lock_downgrade(map) \
292 printf ("locking map LK_DOWNGRADE: 0x%x\n", map); \
293 lockmgr(&(map)->lock, LK_DOWNGRADE, (void *)0, curproc); \
296 #define vm_map_lock_downgrade(map) \
297 lockmgr(&(map)->lock, LK_DOWNGRADE, (void *)0, curproc)
300 #define vm_map_set_recursive(map) \
302 simple_lock(&(map)->lock.lk_interlock); \
303 (map)->lock.lk_flags |= LK_CANRECURSE; \
304 simple_unlock(&(map)->lock.lk_interlock); \
306 #define vm_map_clear_recursive(map) \
308 simple_lock(&(map)->lock.lk_interlock); \
309 (map)->lock.lk_flags &= ~LK_CANRECURSE; \
310 simple_unlock(&(map)->lock.lk_interlock); \
314 * Functions implemented as macros
316 #define vm_map_min(map) ((map)->min_offset)
317 #define vm_map_max(map) ((map)->max_offset)
318 #define vm_map_pmap(map) ((map)->pmap)
320 static __inline struct pmap *
321 vmspace_pmap(struct vmspace *vmspace)
323 return &vmspace->vm_pmap;
327 vmspace_resident_count(struct vmspace *vmspace)
329 return pmap_resident_count(vmspace_pmap(vmspace));
332 /* XXX: number of kernel maps and entries to statically allocate */
334 #define MAX_KMAPENT 128
335 #define MAX_MAPENT 128
338 * Copy-on-write flags for vm_map operations
340 #define MAP_UNUSED_01 0x0001
341 #define MAP_COPY_ON_WRITE 0x0002
342 #define MAP_NOFAULT 0x0004
343 #define MAP_PREFAULT 0x0008
344 #define MAP_PREFAULT_PARTIAL 0x0010
345 #define MAP_DISABLE_SYNCER 0x0020
346 #define MAP_DISABLE_COREDUMP 0x0100
347 #define MAP_PREFAULT_MADVISE 0x0200 /* from (user) madvise request */
350 * vm_fault option flags
352 #define VM_FAULT_NORMAL 0 /* Nothing special */
353 #define VM_FAULT_CHANGE_WIRING 1 /* Change the wiring as appropriate */
354 #define VM_FAULT_USER_WIRE 2 /* Likewise, but for user purposes */
355 #define VM_FAULT_WIRE_MASK (VM_FAULT_CHANGE_WIRING|VM_FAULT_USER_WIRE)
356 #define VM_FAULT_HOLD 4 /* Hold the page */
357 #define VM_FAULT_DIRTY 8 /* Dirty the page */
360 boolean_t vm_map_check_protection __P((vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t));
362 vm_map_t vm_map_create __P((struct pmap *, vm_offset_t, vm_offset_t));
363 int vm_map_delete __P((vm_map_t, vm_offset_t, vm_offset_t));
364 int vm_map_find __P((vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, vm_size_t, boolean_t, vm_prot_t, vm_prot_t, int));
365 int vm_map_findspace __P((vm_map_t, vm_offset_t, vm_size_t, vm_offset_t *));
366 int vm_map_inherit __P((vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t));
367 void vm_map_init __P((struct vm_map *, vm_offset_t, vm_offset_t));
368 int vm_map_insert __P((vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t, vm_offset_t, vm_prot_t, vm_prot_t, int));
369 int vm_map_lookup __P((vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
370 vm_pindex_t *, vm_prot_t *, boolean_t *));
371 void vm_map_lookup_done __P((vm_map_t, vm_map_entry_t));
372 boolean_t vm_map_lookup_entry __P((vm_map_t, vm_offset_t, vm_map_entry_t *));
373 int vm_map_pageable __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t));
374 int vm_map_user_pageable __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t));
375 int vm_map_clean __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t));
376 int vm_map_protect __P((vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t));
377 int vm_map_remove __P((vm_map_t, vm_offset_t, vm_offset_t));
378 void vm_map_startup __P((void));
379 int vm_map_submap __P((vm_map_t, vm_offset_t, vm_offset_t, vm_map_t));
380 int vm_map_madvise __P((vm_map_t, vm_offset_t, vm_offset_t, int));
381 void vm_map_simplify_entry __P((vm_map_t, vm_map_entry_t));
382 void vm_init2 __P((void));
383 int vm_uiomove __P((vm_map_t, vm_object_t, off_t, int, vm_offset_t, int *));
384 void vm_freeze_copyopts __P((vm_object_t, vm_pindex_t, vm_pindex_t));
385 int vm_map_stack __P((vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int));
386 int vm_map_growstack __P((struct proc *p, vm_offset_t addr));
387 int vmspace_swap_count __P((struct vmspace *vmspace));
390 #endif /* _VM_MAP_ */