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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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.
82 * Objects which live in maps may be either VM objects, or
83 * another map (called a "sharing map") which denotes read-write
84 * sharing with other maps.
88 struct vm_object *vm_object; /* object object */
89 struct vm_map *sub_map; /* belongs to another map */
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.
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 vm_offset_t avail_ssize; /* amt can grow if this is a stack */
104 union vm_map_object object; /* object I point to */
105 vm_ooffset_t offset; /* offset into object */
106 u_char eflags; /* map entry flags */
107 /* Only in task maps: */
108 vm_prot_t protection; /* protection code */
109 vm_prot_t max_protection; /* maximum protection */
110 vm_inherit_t inheritance; /* inheritance */
111 int wired_count; /* can be paged if = 0 */
112 vm_pindex_t lastr; /* last read */
115 #define MAP_ENTRY_NOSYNC 0x1
116 #define MAP_ENTRY_IS_SUB_MAP 0x2
117 #define MAP_ENTRY_COW 0x4
118 #define MAP_ENTRY_NEEDS_COPY 0x8
119 #define MAP_ENTRY_NOFAULT 0x10
120 #define MAP_ENTRY_USER_WIRED 0x20
122 #define MAP_ENTRY_BEHAV_NORMAL 0x00 /* default behavior */
123 #define MAP_ENTRY_BEHAV_SEQUENTIAL 0x40 /* expect sequential access */
124 #define MAP_ENTRY_BEHAV_RANDOM 0x80 /* expect random access */
125 #define MAP_ENTRY_BEHAV_RESERVED 0xC0 /* future use */
127 #define MAP_ENTRY_BEHAV_MASK 0xC0
129 static __inline u_char
130 vm_map_entry_behavior(struct vm_map_entry *entry)
132 return entry->eflags & MAP_ENTRY_BEHAV_MASK;
136 vm_map_entry_set_behavior(struct vm_map_entry *entry, u_char behavior)
138 entry->eflags = (entry->eflags & ~MAP_ENTRY_BEHAV_MASK) |
139 (behavior & MAP_ENTRY_BEHAV_MASK);
143 * Maps are doubly-linked lists of map entries, kept sorted
144 * by address. A single hint is provided to start
145 * searches again from the last successful search,
146 * insertion, or removal.
148 * Note: the lock structure cannot be the first element of vm_map
149 * because this can result in a running lockup between two or more
150 * system processes trying to kmem_alloc_wait() due to kmem_alloc_wait()
151 * and free tsleep/waking up 'map' and the underlying lockmgr also
152 * sleeping and waking up on 'map'. The lockup occurs when the map fills
153 * up. The 'exec' map, for example.
156 struct vm_map_entry header; /* List of entries */
157 struct lock lock; /* Lock for map data */
158 int nentries; /* Number of entries */
159 vm_size_t size; /* virtual size */
160 u_char system_map; /* Am I a system map? */
161 vm_map_entry_t hint; /* hint for quick lookups */
162 unsigned int timestamp; /* Version number */
163 vm_map_entry_t first_free; /* First free space hint */
164 struct pmap *pmap; /* Physical map */
165 #define min_offset header.start
166 #define max_offset header.end
170 * Shareable process virtual address space.
171 * May eventually be merged with vm_map.
172 * Several fields are temporary (text, data stuff).
175 struct vm_map vm_map; /* VM address map */
176 struct pmap vm_pmap; /* private physical map */
177 int vm_refcnt; /* number of references */
178 caddr_t vm_shm; /* SYS5 shared memory private data XXX */
179 /* we copy from vm_startcopy to the end of the structure on fork */
180 #define vm_startcopy vm_rssize
181 segsz_t vm_rssize; /* current resident set size in pages */
182 segsz_t vm_swrss; /* resident set size before last swap */
183 segsz_t vm_tsize; /* text size (pages) XXX */
184 segsz_t vm_dsize; /* data size (pages) XXX */
185 segsz_t vm_ssize; /* stack size (pages) */
186 caddr_t vm_taddr; /* user virtual address of text XXX */
187 caddr_t vm_daddr; /* user virtual address of data XXX */
188 caddr_t vm_maxsaddr; /* user VA at max stack growth */
189 caddr_t vm_minsaddr; /* user VA at max stack growth */
193 * Macros: vm_map_lock, etc.
195 * Perform locking on the data portion of a map. Note that
196 * these macros mimic procedure calls returning void. The
197 * semicolon is supplied by the user of these macros, not
198 * by the macros themselves. The macros can safely be used
199 * as unbraced elements in a higher level statement.
202 #define vm_map_lock_drain_interlock(map) \
204 lockmgr(&(map)->lock, LK_DRAIN|LK_INTERLOCK, \
205 &(map)->ref_lock, curproc); \
206 (map)->timestamp++; \
210 /* #define MAP_LOCK_DIAGNOSTIC 1 */
211 #ifdef MAP_LOCK_DIAGNOSTIC
212 #define vm_map_lock(map) \
214 printf ("locking map LK_EXCLUSIVE: 0x%x\n", map); \
215 if (lockmgr(&(map)->lock, LK_EXCLUSIVE, (void *)0, curproc) != 0) { \
216 panic("vm_map_lock: failed to get lock"); \
218 (map)->timestamp++; \
221 #define vm_map_lock(map) \
223 if (lockmgr(&(map)->lock, LK_EXCLUSIVE, (void *)0, curproc) != 0) { \
224 panic("vm_map_lock: failed to get lock"); \
226 (map)->timestamp++; \
230 #define vm_map_lock(map) \
232 lockmgr(&(map)->lock, LK_EXCLUSIVE, (void *)0, curproc); \
233 (map)->timestamp++; \
235 #endif /* DIAGNOSTIC */
237 #if defined(MAP_LOCK_DIAGNOSTIC)
238 #define vm_map_unlock(map) \
240 printf ("locking map LK_RELEASE: 0x%x\n", map); \
241 lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc); \
243 #define vm_map_lock_read(map) \
245 printf ("locking map LK_SHARED: 0x%x\n", map); \
246 lockmgr(&(map)->lock, LK_SHARED, (void *)0, curproc); \
248 #define vm_map_unlock_read(map) \
250 printf ("locking map LK_RELEASE: 0x%x\n", map); \
251 lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc); \
254 #define vm_map_unlock(map) \
255 lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc)
256 #define vm_map_lock_read(map) \
257 lockmgr(&(map)->lock, LK_SHARED, (void *)0, curproc)
258 #define vm_map_unlock_read(map) \
259 lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc)
262 static __inline__ int
263 _vm_map_lock_upgrade(vm_map_t map, struct proc *p) {
265 #if defined(MAP_LOCK_DIAGNOSTIC)
266 printf("locking map LK_EXCLUPGRADE: 0x%x\n", map);
268 error = lockmgr(&map->lock, LK_EXCLUPGRADE, (void *)0, p);
274 #define vm_map_lock_upgrade(map) _vm_map_lock_upgrade(map, curproc)
276 #if defined(MAP_LOCK_DIAGNOSTIC)
277 #define vm_map_lock_downgrade(map) \
279 printf ("locking map LK_DOWNGRADE: 0x%x\n", map); \
280 lockmgr(&(map)->lock, LK_DOWNGRADE, (void *)0, curproc); \
283 #define vm_map_lock_downgrade(map) \
284 lockmgr(&(map)->lock, LK_DOWNGRADE, (void *)0, curproc)
287 #define vm_map_set_recursive(map) \
289 simple_lock(&(map)->lock.lk_interlock); \
290 (map)->lock.lk_flags |= LK_CANRECURSE; \
291 simple_unlock(&(map)->lock.lk_interlock); \
293 #define vm_map_clear_recursive(map) \
295 simple_lock(&(map)->lock.lk_interlock); \
296 (map)->lock.lk_flags &= ~LK_CANRECURSE; \
297 simple_unlock(&(map)->lock.lk_interlock); \
301 * Functions implemented as macros
303 #define vm_map_min(map) ((map)->min_offset)
304 #define vm_map_max(map) ((map)->max_offset)
305 #define vm_map_pmap(map) ((map)->pmap)
307 static __inline struct pmap *
308 vmspace_pmap(struct vmspace *vmspace)
310 return &vmspace->vm_pmap;
314 vmspace_resident_count(struct vmspace *vmspace)
316 return pmap_resident_count(vmspace_pmap(vmspace));
319 /* XXX: number of kernel maps and entries to statically allocate */
321 #define MAX_KMAPENT 128
322 #define MAX_MAPENT 128
325 * Copy-on-write flags for vm_map operations
327 #define MAP_UNUSED_01 0x1
328 #define MAP_COPY_ON_WRITE 0x2
329 #define MAP_NOFAULT 0x4
330 #define MAP_PREFAULT 0x8
331 #define MAP_PREFAULT_PARTIAL 0x10
332 #define MAP_DISABLE_SYNCER 0x20
335 * vm_fault option flags
337 #define VM_FAULT_NORMAL 0 /* Nothing special */
338 #define VM_FAULT_CHANGE_WIRING 1 /* Change the wiring as appropriate */
339 #define VM_FAULT_USER_WIRE 2 /* Likewise, but for user purposes */
340 #define VM_FAULT_WIRE_MASK (VM_FAULT_CHANGE_WIRING|VM_FAULT_USER_WIRE)
341 #define VM_FAULT_HOLD 4 /* Hold the page */
342 #define VM_FAULT_DIRTY 8 /* Dirty the page */
345 boolean_t vm_map_check_protection __P((vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t));
347 vm_map_t vm_map_create __P((struct pmap *, vm_offset_t, vm_offset_t));
348 int vm_map_delete __P((vm_map_t, vm_offset_t, vm_offset_t));
349 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));
350 int vm_map_findspace __P((vm_map_t, vm_offset_t, vm_size_t, vm_offset_t *));
351 int vm_map_inherit __P((vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t));
352 void vm_map_init __P((struct vm_map *, vm_offset_t, vm_offset_t));
353 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));
354 int vm_map_lookup __P((vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
355 vm_pindex_t *, vm_prot_t *, boolean_t *));
356 void vm_map_lookup_done __P((vm_map_t, vm_map_entry_t));
357 boolean_t vm_map_lookup_entry __P((vm_map_t, vm_offset_t, vm_map_entry_t *));
358 int vm_map_pageable __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t));
359 int vm_map_user_pageable __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t));
360 int vm_map_clean __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t));
361 int vm_map_protect __P((vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t));
362 int vm_map_remove __P((vm_map_t, vm_offset_t, vm_offset_t));
363 void vm_map_startup __P((void));
364 int vm_map_submap __P((vm_map_t, vm_offset_t, vm_offset_t, vm_map_t));
365 int vm_map_madvise __P((vm_map_t, vm_offset_t, vm_offset_t, int));
366 void vm_map_simplify_entry __P((vm_map_t, vm_map_entry_t));
367 void vm_init2 __P((void));
368 int vm_uiomove __P((vm_map_t, vm_object_t, off_t, int, vm_offset_t, int *));
369 void vm_freeze_copyopts __P((vm_object_t, vm_pindex_t, vm_pindex_t));
370 int vm_map_stack __P((vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int));
371 int vm_map_growstack __P((struct proc *p, vm_offset_t addr));
374 #endif /* _VM_MAP_ */