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.
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_NOCOREDUMP 0x0400 /* don't include in a core */
133 static __inline u_char
134 vm_map_entry_behavior(struct vm_map_entry *entry)
136 return entry->eflags & MAP_ENTRY_BEHAV_MASK;
140 vm_map_entry_set_behavior(struct vm_map_entry *entry, u_char behavior)
142 entry->eflags = (entry->eflags & ~MAP_ENTRY_BEHAV_MASK) |
143 (behavior & MAP_ENTRY_BEHAV_MASK);
147 * Maps are doubly-linked lists of map entries, kept sorted
148 * by address. A single hint is provided to start
149 * searches again from the last successful search,
150 * insertion, or removal.
152 * Note: the lock structure cannot be the first element of vm_map
153 * because this can result in a running lockup between two or more
154 * system processes trying to kmem_alloc_wait() due to kmem_alloc_wait()
155 * and free tsleep/waking up 'map' and the underlying lockmgr also
156 * sleeping and waking up on 'map'. The lockup occurs when the map fills
157 * up. The 'exec' map, for example.
160 struct vm_map_entry header; /* List of entries */
161 struct lock lock; /* Lock for map data */
162 int nentries; /* Number of entries */
163 vm_size_t size; /* virtual size */
164 u_char system_map; /* Am I a system map? */
165 vm_map_entry_t hint; /* hint for quick lookups */
166 unsigned int timestamp; /* Version number */
167 vm_map_entry_t first_free; /* First free space hint */
168 struct pmap *pmap; /* Physical map */
169 #define min_offset header.start
170 #define max_offset header.end
174 * Shareable process virtual address space.
175 * May eventually be merged with vm_map.
176 * Several fields are temporary (text, data stuff).
179 struct vm_map vm_map; /* VM address map */
180 struct pmap vm_pmap; /* private physical map */
181 int vm_refcnt; /* number of references */
182 caddr_t vm_shm; /* SYS5 shared memory private data XXX */
183 /* we copy from vm_startcopy to the end of the structure on fork */
184 #define vm_startcopy vm_rssize
185 segsz_t vm_rssize; /* current resident set size in pages */
186 segsz_t vm_swrss; /* resident set size before last swap */
187 segsz_t vm_tsize; /* text size (pages) XXX */
188 segsz_t vm_dsize; /* data size (pages) XXX */
189 segsz_t vm_ssize; /* stack size (pages) */
190 caddr_t vm_taddr; /* user virtual address of text XXX */
191 caddr_t vm_daddr; /* user virtual address of data XXX */
192 caddr_t vm_maxsaddr; /* user VA at max stack growth */
193 caddr_t vm_minsaddr; /* user VA at max stack growth */
197 * Macros: vm_map_lock, etc.
199 * Perform locking on the data portion of a map. Note that
200 * these macros mimic procedure calls returning void. The
201 * semicolon is supplied by the user of these macros, not
202 * by the macros themselves. The macros can safely be used
203 * as unbraced elements in a higher level statement.
206 #define vm_map_lock_drain_interlock(map) \
208 lockmgr(&(map)->lock, LK_DRAIN|LK_INTERLOCK, \
209 &(map)->ref_lock, curproc); \
210 (map)->timestamp++; \
214 /* #define MAP_LOCK_DIAGNOSTIC 1 */
215 #ifdef MAP_LOCK_DIAGNOSTIC
216 #define vm_map_lock(map) \
218 printf ("locking map LK_EXCLUSIVE: 0x%x\n", map); \
219 if (lockmgr(&(map)->lock, LK_EXCLUSIVE, (void *)0, curproc) != 0) { \
220 panic("vm_map_lock: failed to get lock"); \
222 (map)->timestamp++; \
225 #define vm_map_lock(map) \
227 if (lockmgr(&(map)->lock, LK_EXCLUSIVE, (void *)0, curproc) != 0) { \
228 panic("vm_map_lock: failed to get lock"); \
230 (map)->timestamp++; \
234 #define vm_map_lock(map) \
236 lockmgr(&(map)->lock, LK_EXCLUSIVE, (void *)0, curproc); \
237 (map)->timestamp++; \
239 #endif /* DIAGNOSTIC */
241 #if defined(MAP_LOCK_DIAGNOSTIC)
242 #define vm_map_unlock(map) \
244 printf ("locking map LK_RELEASE: 0x%x\n", map); \
245 lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc); \
247 #define vm_map_lock_read(map) \
249 printf ("locking map LK_SHARED: 0x%x\n", map); \
250 lockmgr(&(map)->lock, LK_SHARED, (void *)0, curproc); \
252 #define vm_map_unlock_read(map) \
254 printf ("locking map LK_RELEASE: 0x%x\n", map); \
255 lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc); \
258 #define vm_map_unlock(map) \
259 lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc)
260 #define vm_map_lock_read(map) \
261 lockmgr(&(map)->lock, LK_SHARED, (void *)0, curproc)
262 #define vm_map_unlock_read(map) \
263 lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc)
266 static __inline__ int
267 _vm_map_lock_upgrade(vm_map_t map, struct proc *p) {
269 #if defined(MAP_LOCK_DIAGNOSTIC)
270 printf("locking map LK_EXCLUPGRADE: 0x%x\n", map);
272 error = lockmgr(&map->lock, LK_EXCLUPGRADE, (void *)0, p);
278 #define vm_map_lock_upgrade(map) _vm_map_lock_upgrade(map, curproc)
280 #if defined(MAP_LOCK_DIAGNOSTIC)
281 #define vm_map_lock_downgrade(map) \
283 printf ("locking map LK_DOWNGRADE: 0x%x\n", map); \
284 lockmgr(&(map)->lock, LK_DOWNGRADE, (void *)0, curproc); \
287 #define vm_map_lock_downgrade(map) \
288 lockmgr(&(map)->lock, LK_DOWNGRADE, (void *)0, curproc)
291 #define vm_map_set_recursive(map) \
293 simple_lock(&(map)->lock.lk_interlock); \
294 (map)->lock.lk_flags |= LK_CANRECURSE; \
295 simple_unlock(&(map)->lock.lk_interlock); \
297 #define vm_map_clear_recursive(map) \
299 simple_lock(&(map)->lock.lk_interlock); \
300 (map)->lock.lk_flags &= ~LK_CANRECURSE; \
301 simple_unlock(&(map)->lock.lk_interlock); \
305 * Functions implemented as macros
307 #define vm_map_min(map) ((map)->min_offset)
308 #define vm_map_max(map) ((map)->max_offset)
309 #define vm_map_pmap(map) ((map)->pmap)
311 static __inline struct pmap *
312 vmspace_pmap(struct vmspace *vmspace)
314 return &vmspace->vm_pmap;
318 vmspace_resident_count(struct vmspace *vmspace)
320 return pmap_resident_count(vmspace_pmap(vmspace));
323 /* XXX: number of kernel maps and entries to statically allocate */
325 #define MAX_KMAPENT 128
326 #define MAX_MAPENT 128
329 * Copy-on-write flags for vm_map operations
331 #define MAP_UNUSED_01 0x0001
332 #define MAP_COPY_ON_WRITE 0x0002
333 #define MAP_NOFAULT 0x0004
334 #define MAP_PREFAULT 0x0008
335 #define MAP_PREFAULT_PARTIAL 0x0010
336 #define MAP_DISABLE_SYNCER 0x0020
337 #define MAP_DISABLE_COREDUMP 0x0100
340 * vm_fault option flags
342 #define VM_FAULT_NORMAL 0 /* Nothing special */
343 #define VM_FAULT_CHANGE_WIRING 1 /* Change the wiring as appropriate */
344 #define VM_FAULT_USER_WIRE 2 /* Likewise, but for user purposes */
345 #define VM_FAULT_WIRE_MASK (VM_FAULT_CHANGE_WIRING|VM_FAULT_USER_WIRE)
346 #define VM_FAULT_HOLD 4 /* Hold the page */
347 #define VM_FAULT_DIRTY 8 /* Dirty the page */
350 boolean_t vm_map_check_protection __P((vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t));
352 vm_map_t vm_map_create __P((struct pmap *, vm_offset_t, vm_offset_t));
353 int vm_map_delete __P((vm_map_t, vm_offset_t, vm_offset_t));
354 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));
355 int vm_map_findspace __P((vm_map_t, vm_offset_t, vm_size_t, vm_offset_t *));
356 int vm_map_inherit __P((vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t));
357 void vm_map_init __P((struct vm_map *, vm_offset_t, vm_offset_t));
358 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));
359 int vm_map_lookup __P((vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
360 vm_pindex_t *, vm_prot_t *, boolean_t *));
361 void vm_map_lookup_done __P((vm_map_t, vm_map_entry_t));
362 boolean_t vm_map_lookup_entry __P((vm_map_t, vm_offset_t, vm_map_entry_t *));
363 int vm_map_pageable __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t));
364 int vm_map_user_pageable __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t));
365 int vm_map_clean __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t));
366 int vm_map_protect __P((vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t));
367 int vm_map_remove __P((vm_map_t, vm_offset_t, vm_offset_t));
368 void vm_map_startup __P((void));
369 int vm_map_submap __P((vm_map_t, vm_offset_t, vm_offset_t, vm_map_t));
370 int vm_map_madvise __P((vm_map_t, vm_offset_t, vm_offset_t, int));
371 void vm_map_simplify_entry __P((vm_map_t, vm_map_entry_t));
372 void vm_init2 __P((void));
373 int vm_uiomove __P((vm_map_t, vm_object_t, off_t, int, vm_offset_t, int *));
374 void vm_freeze_copyopts __P((vm_object_t, vm_pindex_t, vm_pindex_t));
375 int vm_map_stack __P((vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int));
376 int vm_map_growstack __P((struct proc *p, vm_offset_t addr));
379 #endif /* _VM_MAP_ */