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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9 * modification, are permitted provided that the following conditions
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17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
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21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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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 $
65 * $DragonFly: src/sys/vm/vm_map.h,v 1.18 2006/03/15 07:58:37 dillon Exp $
69 * Virtual memory map module definitions.
76 struct vm_map_rb_tree;
77 RB_PROTOTYPE(vm_map_rb_tree, vm_map_entry, rb_entry, rb_vm_map_compare);
82 * vm_map_t the high-level address map data structure.
83 * vm_map_entry_t an entry in an address map.
86 typedef u_int vm_eflags_t;
89 * Objects which live in maps may be either VM objects, or
90 * another map (called a "sharing map") which denotes read-write
91 * sharing with other maps.
95 struct vm_object *vm_object; /* object object */
96 struct vm_map *sub_map; /* belongs to another map */
100 * Address map entries consist of start and end addresses,
101 * a VM object (or sharing map) and offset into that object,
102 * and user-exported inheritance and protection information.
103 * Also included is control information for virtual copy operations.
105 struct vm_map_entry {
106 struct vm_map_entry *prev; /* previous entry */
107 struct vm_map_entry *next; /* next entry */
108 RB_ENTRY(vm_map_entry) rb_entry;
109 vm_offset_t start; /* start address */
110 vm_offset_t end; /* end address */
111 vm_offset_t avail_ssize; /* amt can grow if this is a stack */
112 union vm_map_object object; /* object I point to */
113 vm_ooffset_t offset; /* offset into object */
114 vm_eflags_t eflags; /* map entry flags */
115 /* Only in task maps: */
116 vm_prot_t protection; /* protection code */
117 vm_prot_t max_protection; /* maximum protection */
118 vm_inherit_t inheritance; /* inheritance */
119 int wired_count; /* can be paged if = 0 */
120 vm_pindex_t lastr; /* last read */
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 /* waiter's in transition */
139 #define MAP_ENTRY_NOCOREDUMP 0x0400 /* don't include in a core */
142 * flags for vm_map_[un]clip_range()
144 #define MAP_CLIP_NO_HOLES 0x0001
147 * This reserve count for vm_map_entry_reserve() should cover all nominal
148 * single-insertion operations, including any necessary clipping.
150 #define MAP_RESERVE_COUNT 4
151 #define MAP_RESERVE_SLOP 32
153 static __inline u_char
154 vm_map_entry_behavior(struct vm_map_entry *entry)
156 return entry->eflags & MAP_ENTRY_BEHAV_MASK;
160 vm_map_entry_set_behavior(struct vm_map_entry *entry, u_char behavior)
162 entry->eflags = (entry->eflags & ~MAP_ENTRY_BEHAV_MASK) |
163 (behavior & MAP_ENTRY_BEHAV_MASK);
167 * Maps are doubly-linked lists of map entries, kept sorted
168 * by address. A single hint is provided to start
169 * searches again from the last successful search,
170 * insertion, or removal.
172 * Note: the lock structure cannot be the first element of vm_map
173 * because this can result in a running lockup between two or more
174 * system processes trying to kmem_alloc_wait() due to kmem_alloc_wait()
175 * and free tsleep/waking up 'map' and the underlying lockmgr also
176 * sleeping and waking up on 'map'. The lockup occurs when the map fills
177 * up. The 'exec' map, for example.
180 struct vm_map_entry header; /* List of entries */
181 RB_HEAD(vm_map_rb_tree, vm_map_entry) rb_root;
182 struct lock lock; /* Lock for map data */
183 int nentries; /* Number of entries */
184 vm_size_t size; /* virtual size */
185 u_char system_map; /* Am I a system map? */
186 u_char infork; /* Am I in fork processing? */
187 vm_map_entry_t hint; /* hint for quick lookups */
188 unsigned int timestamp; /* Version number */
189 vm_map_entry_t first_free; /* First free space hint */
190 struct pmap *pmap; /* Physical map */
191 #define min_offset header.start
192 #define max_offset header.end
201 struct vmupcall *vu_next;
202 void *vu_func; /* user upcall function */
203 void *vu_data; /* user data */
204 void *vu_ctx; /* user context function */
205 struct lwp *vu_lwp; /* process that registered upcall */
206 int vu_id; /* upcall identifier */
207 int vu_pending; /* upcall request pending */
211 * Shareable process virtual address space.
212 * May eventually be merged with vm_map.
213 * Several fields are temporary (text, data stuff).
216 struct vm_map vm_map; /* VM address map */
217 struct pmap vm_pmap; /* private physical map */
218 int vm_refcnt; /* number of references */
219 caddr_t vm_shm; /* SYS5 shared memory private data XXX */
220 /* we copy from vm_startcopy to the end of the structure on fork */
221 #define vm_startcopy vm_rssize
222 segsz_t vm_rssize; /* current resident set size in pages */
223 segsz_t vm_swrss; /* resident set size before last swap */
224 segsz_t vm_tsize; /* text size (pages) XXX */
225 segsz_t vm_dsize; /* data size (pages) XXX */
226 segsz_t vm_ssize; /* stack size (pages) */
227 caddr_t vm_taddr; /* user virtual address of text XXX */
228 caddr_t vm_daddr; /* user virtual address of data XXX */
229 caddr_t vm_maxsaddr; /* user VA at max stack growth */
230 caddr_t vm_minsaddr; /* user VA at max stack growth */
231 #define vm_endcopy vm_exitingcnt
232 int vm_exitingcnt; /* several procsses zombied in exit1 */
233 int vm_upccount; /* number of registered upcalls */
235 struct vmupcall *vm_upcalls; /* registered upcalls */
239 * Resident executable holding structure. A user program can take a snapshot
240 * of just its VM address space (typically done just after dynamic link
241 * libraries have completed loading) and register it as a resident
242 * executable associated with the program binary's vnode, which is also
243 * locked into memory. Future execs of the vnode will start with a copy
244 * of the resident vmspace instead of running the binary from scratch,
245 * avoiding both the kernel ELF loader *AND* all shared library mapping and
246 * relocation code, and will call a different entry point (the stack pointer
247 * is reset to the top of the stack) supplied when the vmspace was registered.
250 struct vnode *vr_vnode; /* associated vnode */
251 TAILQ_ENTRY(vmresident) vr_link; /* linked list of res sts */
252 struct vmspace *vr_vmspace; /* vmspace to fork */
253 intptr_t vr_entry_addr; /* registered entry point */
254 struct sysentvec *vr_sysent; /* system call vects */
255 int vr_id; /* registration id */
260 * Macros: vm_map_lock, etc.
262 * Perform locking on the data portion of a map. Note that
263 * these macros mimic procedure calls returning void. The
264 * semicolon is supplied by the user of these macros, not
265 * by the macros themselves. The macros can safely be used
266 * as unbraced elements in a higher level statement.
270 /* #define MAP_LOCK_DIAGNOSTIC 1 */
271 #ifdef MAP_LOCK_DIAGNOSTIC
272 #define vm_map_lock(map) \
274 printf ("locking map LK_EXCLUSIVE: 0x%x\n", map); \
275 if (lockmgr(&(map)->lock, LK_EXCLUSIVE, NULL, curthread) != 0) { \
276 panic("vm_map_lock: failed to get lock"); \
278 (map)->timestamp++; \
281 #define vm_map_lock(map) \
283 if (lockmgr(&(map)->lock, LK_EXCLUSIVE, NULL, curthread) != 0) { \
284 panic("vm_map_lock: failed to get lock"); \
286 (map)->timestamp++; \
290 #define vm_map_lock(map) \
292 lockmgr(&(map)->lock, LK_EXCLUSIVE, NULL, curthread); \
293 (map)->timestamp++; \
295 #endif /* DIAGNOSTIC */
297 #if defined(MAP_LOCK_DIAGNOSTIC)
298 #define vm_map_unlock(map) \
300 printf ("locking map LK_RELEASE: 0x%x\n", map); \
301 lockmgr(&(map)->lock, LK_RELEASE, NULL, curthread); \
303 #define vm_map_lock_read(map) \
305 printf ("locking map LK_SHARED: 0x%x\n", map); \
306 lockmgr(&(map)->lock, LK_SHARED, NULL, curthread); \
308 #define vm_map_unlock_read(map) \
310 printf ("locking map LK_RELEASE: 0x%x\n", map); \
311 lockmgr(&(map)->lock, LK_RELEASE, NULL, curthread); \
314 #define vm_map_unlock(map) \
315 lockmgr(&(map)->lock, LK_RELEASE, NULL, curthread)
316 #define vm_map_lock_read(map) \
317 lockmgr(&(map)->lock, LK_SHARED, NULL, curthread)
318 #define vm_map_unlock_read(map) \
319 lockmgr(&(map)->lock, LK_RELEASE, NULL, curthread)
322 static __inline__ int
323 _vm_map_lock_upgrade(vm_map_t map, struct thread *td) {
325 #if defined(MAP_LOCK_DIAGNOSTIC)
326 printf("locking map LK_EXCLUPGRADE: 0x%x\n", map);
328 error = lockmgr(&map->lock, LK_EXCLUPGRADE, NULL, td);
334 #define vm_map_lock_upgrade(map) _vm_map_lock_upgrade(map, curthread)
336 #if defined(MAP_LOCK_DIAGNOSTIC)
337 #define vm_map_lock_downgrade(map) \
339 printf ("locking map LK_DOWNGRADE: 0x%x\n", map); \
340 lockmgr(&(map)->lock, LK_DOWNGRADE, NULL, curthread); \
343 #define vm_map_lock_downgrade(map) \
344 lockmgr(&(map)->lock, LK_DOWNGRADE, NULL, curthread)
350 * Functions implemented as macros
352 #define vm_map_min(map) ((map)->min_offset)
353 #define vm_map_max(map) ((map)->max_offset)
354 #define vm_map_pmap(map) ((map)->pmap)
356 static __inline struct pmap *
357 vmspace_pmap(struct vmspace *vmspace)
359 return &vmspace->vm_pmap;
363 vmspace_resident_count(struct vmspace *vmspace)
365 return pmap_resident_count(vmspace_pmap(vmspace));
369 * Number of kernel maps and entries to statically allocate, required
370 * during boot to bootstrap the VM system.
373 #define MAX_MAPENT 256
376 * Copy-on-write flags for vm_map operations
378 #define MAP_UNUSED_01 0x0001
379 #define MAP_COPY_ON_WRITE 0x0002
380 #define MAP_NOFAULT 0x0004
381 #define MAP_PREFAULT 0x0008
382 #define MAP_PREFAULT_PARTIAL 0x0010
383 #define MAP_DISABLE_SYNCER 0x0020
384 #define MAP_DISABLE_COREDUMP 0x0100
385 #define MAP_PREFAULT_MADVISE 0x0200 /* from (user) madvise request */
388 * vm_fault option flags
390 #define VM_FAULT_NORMAL 0 /* Nothing special */
391 #define VM_FAULT_CHANGE_WIRING 1 /* Change the wiring as appropriate */
392 #define VM_FAULT_USER_WIRE 2 /* Likewise, but for user purposes */
393 #define VM_FAULT_WIRE_MASK (VM_FAULT_CHANGE_WIRING|VM_FAULT_USER_WIRE)
394 #define VM_FAULT_HOLD 4 /* Hold the page */
395 #define VM_FAULT_DIRTY 8 /* Dirty the page */
398 boolean_t vm_map_check_protection (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t);
401 void vm_map_entry_reserve_cpu_init(struct globaldata *gd);
402 int vm_map_entry_reserve(int);
403 int vm_map_entry_kreserve(int);
404 void vm_map_entry_release(int);
405 void vm_map_entry_krelease(int);
406 vm_map_t vm_map_create (struct pmap *, vm_offset_t, vm_offset_t);
407 int vm_map_delete (vm_map_t, vm_offset_t, vm_offset_t, int *);
408 int vm_map_find (vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, vm_size_t, boolean_t, vm_prot_t, vm_prot_t, int);
409 int vm_map_findspace (vm_map_t, vm_offset_t, vm_size_t, vm_offset_t, vm_offset_t *);
410 int vm_map_inherit (vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t);
411 void vm_map_init (struct vm_map *, vm_offset_t, vm_offset_t);
412 int vm_map_insert (vm_map_t, int *, vm_object_t, vm_ooffset_t, vm_offset_t, vm_offset_t, vm_prot_t, vm_prot_t, int);
413 int vm_map_lookup (vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
414 vm_pindex_t *, vm_prot_t *, boolean_t *);
415 void vm_map_lookup_done (vm_map_t, vm_map_entry_t, int);
416 boolean_t vm_map_lookup_entry (vm_map_t, vm_offset_t, vm_map_entry_t *);
417 int vm_map_wire (vm_map_t, vm_offset_t, vm_offset_t, int);
418 int vm_map_unwire (vm_map_t, vm_offset_t, vm_offset_t, boolean_t);
419 int vm_map_clean (vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t);
420 int vm_map_protect (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t);
421 int vm_map_remove (vm_map_t, vm_offset_t, vm_offset_t);
422 void vm_map_startup (void);
423 int vm_map_submap (vm_map_t, vm_offset_t, vm_offset_t, vm_map_t);
424 int vm_map_madvise (vm_map_t, vm_offset_t, vm_offset_t, int);
425 void vm_map_simplify_entry (vm_map_t, vm_map_entry_t, int *);
426 void vm_init2 (void);
427 int vm_uiomove (vm_map_t, vm_object_t, off_t, int, vm_offset_t, int *);
428 void vm_freeze_copyopts (vm_object_t, vm_pindex_t, vm_pindex_t);
429 int vm_map_stack (vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int);
430 int vm_map_growstack (struct proc *p, vm_offset_t addr);
431 int vmspace_swap_count (struct vmspace *vmspace);
432 void vm_map_set_wired_quick(vm_map_t map, vm_offset_t addr, vm_size_t size, int *);
435 #endif /* _VM_MAP_ */