FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_map.c
1 /*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * The Mach Operating System project at Carnegie-Mellon University.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * from: @(#)vm_map.c 8.3 (Berkeley) 1/12/94
33 *
34 *
35 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
36 * All rights reserved.
37 *
38 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
39 *
40 * Permission to use, copy, modify and distribute this software and
41 * its documentation is hereby granted, provided that both the copyright
42 * notice and this permission notice appear in all copies of the
43 * software, derivative works or modified versions, and any portions
44 * thereof, and that both notices appear in supporting documentation.
45 *
46 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
47 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
48 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
49 *
50 * Carnegie Mellon requests users of this software to return to
51 *
52 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
53 * School of Computer Science
54 * Carnegie Mellon University
55 * Pittsburgh PA 15213-3890
56 *
57 * any improvements or extensions that they make and grant Carnegie the
58 * rights to redistribute these changes.
59 */
60
61 /*
62 * Virtual memory mapping module.
63 */
64
65 #include <sys/cdefs.h>
66 __FBSDID("$FreeBSD: releng/7.3/sys/vm/vm_map.c 203820 2010-02-13 11:24:11Z kib $");
67
68 #include <sys/param.h>
69 #include <sys/systm.h>
70 #include <sys/ktr.h>
71 #include <sys/lock.h>
72 #include <sys/mutex.h>
73 #include <sys/proc.h>
74 #include <sys/vmmeter.h>
75 #include <sys/mman.h>
76 #include <sys/vnode.h>
77 #include <sys/resourcevar.h>
78 #include <sys/file.h>
79 #include <sys/sysent.h>
80 #include <sys/shm.h>
81
82 #include <vm/vm.h>
83 #include <vm/vm_param.h>
84 #include <vm/pmap.h>
85 #include <vm/vm_map.h>
86 #include <vm/vm_page.h>
87 #include <vm/vm_object.h>
88 #include <vm/vm_pager.h>
89 #include <vm/vm_kern.h>
90 #include <vm/vm_extern.h>
91 #include <vm/swap_pager.h>
92 #include <vm/uma.h>
93
94 /*
95 * Virtual memory maps provide for the mapping, protection,
96 * and sharing of virtual memory objects. In addition,
97 * this module provides for an efficient virtual copy of
98 * memory from one map to another.
99 *
100 * Synchronization is required prior to most operations.
101 *
102 * Maps consist of an ordered doubly-linked list of simple
103 * entries; a single hint is used to speed up lookups.
104 *
105 * Since portions of maps are specified by start/end addresses,
106 * which may not align with existing map entries, all
107 * routines merely "clip" entries to these start/end values.
108 * [That is, an entry is split into two, bordering at a
109 * start or end value.] Note that these clippings may not
110 * always be necessary (as the two resulting entries are then
111 * not changed); however, the clipping is done for convenience.
112 *
113 * As mentioned above, virtual copy operations are performed
114 * by copying VM object references from one map to
115 * another, and then marking both regions as copy-on-write.
116 */
117
118 static struct mtx map_sleep_mtx;
119 static uma_zone_t mapentzone;
120 static uma_zone_t kmapentzone;
121 static uma_zone_t mapzone;
122 static uma_zone_t vmspace_zone;
123 static struct vm_object kmapentobj;
124 static int vmspace_zinit(void *mem, int size, int flags);
125 static void vmspace_zfini(void *mem, int size);
126 static int vm_map_zinit(void *mem, int ize, int flags);
127 static void vm_map_zfini(void *mem, int size);
128 static void _vm_map_init(vm_map_t map, vm_offset_t min, vm_offset_t max);
129
130 #ifdef INVARIANTS
131 static void vm_map_zdtor(void *mem, int size, void *arg);
132 static void vmspace_zdtor(void *mem, int size, void *arg);
133 #endif
134
135 /*
136 * PROC_VMSPACE_{UN,}LOCK() can be a noop as long as vmspaces are type
137 * stable.
138 */
139 #define PROC_VMSPACE_LOCK(p) do { } while (0)
140 #define PROC_VMSPACE_UNLOCK(p) do { } while (0)
141
142 /*
143 * VM_MAP_RANGE_CHECK: [ internal use only ]
144 *
145 * Asserts that the starting and ending region
146 * addresses fall within the valid range of the map.
147 */
148 #define VM_MAP_RANGE_CHECK(map, start, end) \
149 { \
150 if (start < vm_map_min(map)) \
151 start = vm_map_min(map); \
152 if (end > vm_map_max(map)) \
153 end = vm_map_max(map); \
154 if (start > end) \
155 start = end; \
156 }
157
158 /*
159 * vm_map_startup:
160 *
161 * Initialize the vm_map module. Must be called before
162 * any other vm_map routines.
163 *
164 * Map and entry structures are allocated from the general
165 * purpose memory pool with some exceptions:
166 *
167 * - The kernel map and kmem submap are allocated statically.
168 * - Kernel map entries are allocated out of a static pool.
169 *
170 * These restrictions are necessary since malloc() uses the
171 * maps and requires map entries.
172 */
173
174 void
175 vm_map_startup(void)
176 {
177 mtx_init(&map_sleep_mtx, "vm map sleep mutex", NULL, MTX_DEF);
178 mapzone = uma_zcreate("MAP", sizeof(struct vm_map), NULL,
179 #ifdef INVARIANTS
180 vm_map_zdtor,
181 #else
182 NULL,
183 #endif
184 vm_map_zinit, vm_map_zfini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
185 uma_prealloc(mapzone, MAX_KMAP);
186 kmapentzone = uma_zcreate("KMAP ENTRY", sizeof(struct vm_map_entry),
187 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
188 UMA_ZONE_MTXCLASS | UMA_ZONE_VM);
189 uma_prealloc(kmapentzone, MAX_KMAPENT);
190 mapentzone = uma_zcreate("MAP ENTRY", sizeof(struct vm_map_entry),
191 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
192 }
193
194 static void
195 vmspace_zfini(void *mem, int size)
196 {
197 struct vmspace *vm;
198
199 vm = (struct vmspace *)mem;
200 vm_map_zfini(&vm->vm_map, sizeof(vm->vm_map));
201 }
202
203 static int
204 vmspace_zinit(void *mem, int size, int flags)
205 {
206 struct vmspace *vm;
207
208 vm = (struct vmspace *)mem;
209
210 vm->vm_map.pmap = NULL;
211 (void)vm_map_zinit(&vm->vm_map, sizeof(vm->vm_map), flags);
212 return (0);
213 }
214
215 static void
216 vm_map_zfini(void *mem, int size)
217 {
218 vm_map_t map;
219
220 map = (vm_map_t)mem;
221 mtx_destroy(&map->system_mtx);
222 sx_destroy(&map->lock);
223 }
224
225 static int
226 vm_map_zinit(void *mem, int size, int flags)
227 {
228 vm_map_t map;
229
230 map = (vm_map_t)mem;
231 map->nentries = 0;
232 map->size = 0;
233 mtx_init(&map->system_mtx, "system map", NULL, MTX_DEF | MTX_DUPOK);
234 sx_init(&map->lock, "user map");
235 return (0);
236 }
237
238 #ifdef INVARIANTS
239 static void
240 vmspace_zdtor(void *mem, int size, void *arg)
241 {
242 struct vmspace *vm;
243
244 vm = (struct vmspace *)mem;
245
246 vm_map_zdtor(&vm->vm_map, sizeof(vm->vm_map), arg);
247 }
248 static void
249 vm_map_zdtor(void *mem, int size, void *arg)
250 {
251 vm_map_t map;
252
253 map = (vm_map_t)mem;
254 KASSERT(map->nentries == 0,
255 ("map %p nentries == %d on free.",
256 map, map->nentries));
257 KASSERT(map->size == 0,
258 ("map %p size == %lu on free.",
259 map, (unsigned long)map->size));
260 }
261 #endif /* INVARIANTS */
262
263 /*
264 * Allocate a vmspace structure, including a vm_map and pmap,
265 * and initialize those structures. The refcnt is set to 1.
266 */
267 struct vmspace *
268 vmspace_alloc(min, max)
269 vm_offset_t min, max;
270 {
271 struct vmspace *vm;
272
273 vm = uma_zalloc(vmspace_zone, M_WAITOK);
274 if (vm->vm_map.pmap == NULL && !pmap_pinit(vmspace_pmap(vm))) {
275 uma_zfree(vmspace_zone, vm);
276 return (NULL);
277 }
278 CTR1(KTR_VM, "vmspace_alloc: %p", vm);
279 _vm_map_init(&vm->vm_map, min, max);
280 vm->vm_map.pmap = vmspace_pmap(vm); /* XXX */
281 vm->vm_refcnt = 1;
282 vm->vm_shm = NULL;
283 vm->vm_swrss = 0;
284 vm->vm_tsize = 0;
285 vm->vm_dsize = 0;
286 vm->vm_ssize = 0;
287 vm->vm_taddr = 0;
288 vm->vm_daddr = 0;
289 vm->vm_maxsaddr = 0;
290 return (vm);
291 }
292
293 void
294 vm_init2(void)
295 {
296 uma_zone_set_obj(kmapentzone, &kmapentobj, lmin(cnt.v_page_count,
297 (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / PAGE_SIZE) / 8 +
298 maxproc * 2 + maxfiles);
299 vmspace_zone = uma_zcreate("VMSPACE", sizeof(struct vmspace), NULL,
300 #ifdef INVARIANTS
301 vmspace_zdtor,
302 #else
303 NULL,
304 #endif
305 vmspace_zinit, vmspace_zfini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
306 }
307
308 static inline void
309 vmspace_dofree(struct vmspace *vm)
310 {
311 CTR1(KTR_VM, "vmspace_free: %p", vm);
312
313 /*
314 * Make sure any SysV shm is freed, it might not have been in
315 * exit1().
316 */
317 shmexit(vm);
318
319 /*
320 * Lock the map, to wait out all other references to it.
321 * Delete all of the mappings and pages they hold, then call
322 * the pmap module to reclaim anything left.
323 */
324 (void)vm_map_remove(&vm->vm_map, vm->vm_map.min_offset,
325 vm->vm_map.max_offset);
326
327 /*
328 * XXX Comment out the pmap_release call for now. The
329 * vmspace_zone is marked as UMA_ZONE_NOFREE, and bugs cause
330 * pmap.resident_count to be != 0 on exit sometimes.
331 */
332 /* pmap_release(vmspace_pmap(vm)); */
333 uma_zfree(vmspace_zone, vm);
334 }
335
336 void
337 vmspace_free(struct vmspace *vm)
338 {
339 int refcnt;
340
341 if (vm->vm_refcnt == 0)
342 panic("vmspace_free: attempt to free already freed vmspace");
343
344 do
345 refcnt = vm->vm_refcnt;
346 while (!atomic_cmpset_int(&vm->vm_refcnt, refcnt, refcnt - 1));
347 if (refcnt == 1)
348 vmspace_dofree(vm);
349 }
350
351 void
352 vmspace_exitfree(struct proc *p)
353 {
354 struct vmspace *vm;
355
356 PROC_VMSPACE_LOCK(p);
357 vm = p->p_vmspace;
358 p->p_vmspace = NULL;
359 PROC_VMSPACE_UNLOCK(p);
360 KASSERT(vm == &vmspace0, ("vmspace_exitfree: wrong vmspace"));
361 vmspace_free(vm);
362 }
363
364 void
365 vmspace_exit(struct thread *td)
366 {
367 int refcnt;
368 struct vmspace *vm;
369 struct proc *p;
370
371 /*
372 * Release user portion of address space.
373 * This releases references to vnodes,
374 * which could cause I/O if the file has been unlinked.
375 * Need to do this early enough that we can still sleep.
376 *
377 * The last exiting process to reach this point releases as
378 * much of the environment as it can. vmspace_dofree() is the
379 * slower fallback in case another process had a temporary
380 * reference to the vmspace.
381 */
382
383 p = td->td_proc;
384 vm = p->p_vmspace;
385 atomic_add_int(&vmspace0.vm_refcnt, 1);
386 do {
387 refcnt = vm->vm_refcnt;
388 if (refcnt > 1 && p->p_vmspace != &vmspace0) {
389 /* Switch now since other proc might free vmspace */
390 PROC_VMSPACE_LOCK(p);
391 p->p_vmspace = &vmspace0;
392 PROC_VMSPACE_UNLOCK(p);
393 pmap_activate(td);
394 }
395 } while (!atomic_cmpset_int(&vm->vm_refcnt, refcnt, refcnt - 1));
396 if (refcnt == 1) {
397 if (p->p_vmspace != vm) {
398 /* vmspace not yet freed, switch back */
399 PROC_VMSPACE_LOCK(p);
400 p->p_vmspace = vm;
401 PROC_VMSPACE_UNLOCK(p);
402 pmap_activate(td);
403 }
404 pmap_remove_pages(vmspace_pmap(vm));
405 /* Switch now since this proc will free vmspace */
406 PROC_VMSPACE_LOCK(p);
407 p->p_vmspace = &vmspace0;
408 PROC_VMSPACE_UNLOCK(p);
409 pmap_activate(td);
410 vmspace_dofree(vm);
411 }
412 }
413
414 /* Acquire reference to vmspace owned by another process. */
415
416 struct vmspace *
417 vmspace_acquire_ref(struct proc *p)
418 {
419 struct vmspace *vm;
420 int refcnt;
421
422 PROC_VMSPACE_LOCK(p);
423 vm = p->p_vmspace;
424 if (vm == NULL) {
425 PROC_VMSPACE_UNLOCK(p);
426 return (NULL);
427 }
428 do {
429 refcnt = vm->vm_refcnt;
430 if (refcnt <= 0) { /* Avoid 0->1 transition */
431 PROC_VMSPACE_UNLOCK(p);
432 return (NULL);
433 }
434 } while (!atomic_cmpset_int(&vm->vm_refcnt, refcnt, refcnt + 1));
435 if (vm != p->p_vmspace) {
436 PROC_VMSPACE_UNLOCK(p);
437 vmspace_free(vm);
438 return (NULL);
439 }
440 PROC_VMSPACE_UNLOCK(p);
441 return (vm);
442 }
443
444 void
445 _vm_map_lock(vm_map_t map, const char *file, int line)
446 {
447
448 if (map->system_map)
449 _mtx_lock_flags(&map->system_mtx, 0, file, line);
450 else
451 (void)_sx_xlock(&map->lock, 0, file, line);
452 map->timestamp++;
453 }
454
455 void
456 _vm_map_unlock(vm_map_t map, const char *file, int line)
457 {
458
459 if (map->system_map)
460 _mtx_unlock_flags(&map->system_mtx, 0, file, line);
461 else
462 _sx_xunlock(&map->lock, file, line);
463 }
464
465 void
466 _vm_map_lock_read(vm_map_t map, const char *file, int line)
467 {
468
469 if (map->system_map)
470 _mtx_lock_flags(&map->system_mtx, 0, file, line);
471 else
472 (void)_sx_xlock(&map->lock, 0, file, line);
473 }
474
475 void
476 _vm_map_unlock_read(vm_map_t map, const char *file, int line)
477 {
478
479 if (map->system_map)
480 _mtx_unlock_flags(&map->system_mtx, 0, file, line);
481 else
482 _sx_xunlock(&map->lock, file, line);
483 }
484
485 int
486 _vm_map_trylock(vm_map_t map, const char *file, int line)
487 {
488 int error;
489
490 error = map->system_map ?
491 !_mtx_trylock(&map->system_mtx, 0, file, line) :
492 !_sx_try_xlock(&map->lock, file, line);
493 if (error == 0)
494 map->timestamp++;
495 return (error == 0);
496 }
497
498 int
499 _vm_map_trylock_read(vm_map_t map, const char *file, int line)
500 {
501 int error;
502
503 error = map->system_map ?
504 !_mtx_trylock(&map->system_mtx, 0, file, line) :
505 !_sx_try_xlock(&map->lock, file, line);
506 return (error == 0);
507 }
508
509 int
510 _vm_map_lock_upgrade(vm_map_t map, const char *file, int line)
511 {
512
513 #ifdef INVARIANTS
514 if (map->system_map) {
515 _mtx_assert(&map->system_mtx, MA_OWNED, file, line);
516 } else
517 _sx_assert(&map->lock, SX_XLOCKED, file, line);
518 #endif
519 map->timestamp++;
520 return (0);
521 }
522
523 void
524 _vm_map_lock_downgrade(vm_map_t map, const char *file, int line)
525 {
526
527 #ifdef INVARIANTS
528 if (map->system_map) {
529 _mtx_assert(&map->system_mtx, MA_OWNED, file, line);
530 } else
531 _sx_assert(&map->lock, SX_XLOCKED, file, line);
532 #endif
533 }
534
535 /*
536 * vm_map_unlock_and_wait:
537 */
538 int
539 vm_map_unlock_and_wait(vm_map_t map, boolean_t user_wait)
540 {
541
542 mtx_lock(&map_sleep_mtx);
543 vm_map_unlock(map);
544 return (msleep(&map->root, &map_sleep_mtx, PDROP | PVM, "vmmaps", 0));
545 }
546
547 /*
548 * vm_map_wakeup:
549 */
550 void
551 vm_map_wakeup(vm_map_t map)
552 {
553
554 /*
555 * Acquire and release map_sleep_mtx to prevent a wakeup()
556 * from being performed (and lost) between the vm_map_unlock()
557 * and the msleep() in vm_map_unlock_and_wait().
558 */
559 mtx_lock(&map_sleep_mtx);
560 mtx_unlock(&map_sleep_mtx);
561 wakeup(&map->root);
562 }
563
564 long
565 vmspace_resident_count(struct vmspace *vmspace)
566 {
567 return pmap_resident_count(vmspace_pmap(vmspace));
568 }
569
570 long
571 vmspace_wired_count(struct vmspace *vmspace)
572 {
573 return pmap_wired_count(vmspace_pmap(vmspace));
574 }
575
576 /*
577 * vm_map_create:
578 *
579 * Creates and returns a new empty VM map with
580 * the given physical map structure, and having
581 * the given lower and upper address bounds.
582 */
583 vm_map_t
584 vm_map_create(pmap_t pmap, vm_offset_t min, vm_offset_t max)
585 {
586 vm_map_t result;
587
588 result = uma_zalloc(mapzone, M_WAITOK);
589 CTR1(KTR_VM, "vm_map_create: %p", result);
590 _vm_map_init(result, min, max);
591 result->pmap = pmap;
592 return (result);
593 }
594
595 /*
596 * Initialize an existing vm_map structure
597 * such as that in the vmspace structure.
598 * The pmap is set elsewhere.
599 */
600 static void
601 _vm_map_init(vm_map_t map, vm_offset_t min, vm_offset_t max)
602 {
603
604 map->header.next = map->header.prev = &map->header;
605 map->needs_wakeup = FALSE;
606 map->system_map = 0;
607 map->min_offset = min;
608 map->max_offset = max;
609 map->flags = 0;
610 map->root = NULL;
611 map->timestamp = 0;
612 }
613
614 void
615 vm_map_init(vm_map_t map, vm_offset_t min, vm_offset_t max)
616 {
617 _vm_map_init(map, min, max);
618 mtx_init(&map->system_mtx, "system map", NULL, MTX_DEF | MTX_DUPOK);
619 sx_init(&map->lock, "user map");
620 }
621
622 /*
623 * vm_map_entry_dispose: [ internal use only ]
624 *
625 * Inverse of vm_map_entry_create.
626 */
627 static void
628 vm_map_entry_dispose(vm_map_t map, vm_map_entry_t entry)
629 {
630 uma_zfree(map->system_map ? kmapentzone : mapentzone, entry);
631 }
632
633 /*
634 * vm_map_entry_create: [ internal use only ]
635 *
636 * Allocates a VM map entry for insertion.
637 * No entry fields are filled in.
638 */
639 static vm_map_entry_t
640 vm_map_entry_create(vm_map_t map)
641 {
642 vm_map_entry_t new_entry;
643
644 if (map->system_map)
645 new_entry = uma_zalloc(kmapentzone, M_NOWAIT);
646 else
647 new_entry = uma_zalloc(mapentzone, M_WAITOK);
648 if (new_entry == NULL)
649 panic("vm_map_entry_create: kernel resources exhausted");
650 return (new_entry);
651 }
652
653 /*
654 * vm_map_entry_set_behavior:
655 *
656 * Set the expected access behavior, either normal, random, or
657 * sequential.
658 */
659 static inline void
660 vm_map_entry_set_behavior(vm_map_entry_t entry, u_char behavior)
661 {
662 entry->eflags = (entry->eflags & ~MAP_ENTRY_BEHAV_MASK) |
663 (behavior & MAP_ENTRY_BEHAV_MASK);
664 }
665
666 /*
667 * vm_map_entry_set_max_free:
668 *
669 * Set the max_free field in a vm_map_entry.
670 */
671 static inline void
672 vm_map_entry_set_max_free(vm_map_entry_t entry)
673 {
674
675 entry->max_free = entry->adj_free;
676 if (entry->left != NULL && entry->left->max_free > entry->max_free)
677 entry->max_free = entry->left->max_free;
678 if (entry->right != NULL && entry->right->max_free > entry->max_free)
679 entry->max_free = entry->right->max_free;
680 }
681
682 /*
683 * vm_map_entry_splay:
684 *
685 * The Sleator and Tarjan top-down splay algorithm with the
686 * following variation. Max_free must be computed bottom-up, so
687 * on the downward pass, maintain the left and right spines in
688 * reverse order. Then, make a second pass up each side to fix
689 * the pointers and compute max_free. The time bound is O(log n)
690 * amortized.
691 *
692 * The new root is the vm_map_entry containing "addr", or else an
693 * adjacent entry (lower or higher) if addr is not in the tree.
694 *
695 * The map must be locked, and leaves it so.
696 *
697 * Returns: the new root.
698 */
699 static vm_map_entry_t
700 vm_map_entry_splay(vm_offset_t addr, vm_map_entry_t root)
701 {
702 vm_map_entry_t llist, rlist;
703 vm_map_entry_t ltree, rtree;
704 vm_map_entry_t y;
705
706 /* Special case of empty tree. */
707 if (root == NULL)
708 return (root);
709
710 /*
711 * Pass One: Splay down the tree until we find addr or a NULL
712 * pointer where addr would go. llist and rlist are the two
713 * sides in reverse order (bottom-up), with llist linked by
714 * the right pointer and rlist linked by the left pointer in
715 * the vm_map_entry. Wait until Pass Two to set max_free on
716 * the two spines.
717 */
718 llist = NULL;
719 rlist = NULL;
720 for (;;) {
721 /* root is never NULL in here. */
722 if (addr < root->start) {
723 y = root->left;
724 if (y == NULL)
725 break;
726 if (addr < y->start && y->left != NULL) {
727 /* Rotate right and put y on rlist. */
728 root->left = y->right;
729 y->right = root;
730 vm_map_entry_set_max_free(root);
731 root = y->left;
732 y->left = rlist;
733 rlist = y;
734 } else {
735 /* Put root on rlist. */
736 root->left = rlist;
737 rlist = root;
738 root = y;
739 }
740 } else {
741 y = root->right;
742 if (addr < root->end || y == NULL)
743 break;
744 if (addr >= y->end && y->right != NULL) {
745 /* Rotate left and put y on llist. */
746 root->right = y->left;
747 y->left = root;
748 vm_map_entry_set_max_free(root);
749 root = y->right;
750 y->right = llist;
751 llist = y;
752 } else {
753 /* Put root on llist. */
754 root->right = llist;
755 llist = root;
756 root = y;
757 }
758 }
759 }
760
761 /*
762 * Pass Two: Walk back up the two spines, flip the pointers
763 * and set max_free. The subtrees of the root go at the
764 * bottom of llist and rlist.
765 */
766 ltree = root->left;
767 while (llist != NULL) {
768 y = llist->right;
769 llist->right = ltree;
770 vm_map_entry_set_max_free(llist);
771 ltree = llist;
772 llist = y;
773 }
774 rtree = root->right;
775 while (rlist != NULL) {
776 y = rlist->left;
777 rlist->left = rtree;
778 vm_map_entry_set_max_free(rlist);
779 rtree = rlist;
780 rlist = y;
781 }
782
783 /*
784 * Final assembly: add ltree and rtree as subtrees of root.
785 */
786 root->left = ltree;
787 root->right = rtree;
788 vm_map_entry_set_max_free(root);
789
790 return (root);
791 }
792
793 /*
794 * vm_map_entry_{un,}link:
795 *
796 * Insert/remove entries from maps.
797 */
798 static void
799 vm_map_entry_link(vm_map_t map,
800 vm_map_entry_t after_where,
801 vm_map_entry_t entry)
802 {
803
804 CTR4(KTR_VM,
805 "vm_map_entry_link: map %p, nentries %d, entry %p, after %p", map,
806 map->nentries, entry, after_where);
807 map->nentries++;
808 entry->prev = after_where;
809 entry->next = after_where->next;
810 entry->next->prev = entry;
811 after_where->next = entry;
812
813 if (after_where != &map->header) {
814 if (after_where != map->root)
815 vm_map_entry_splay(after_where->start, map->root);
816 entry->right = after_where->right;
817 entry->left = after_where;
818 after_where->right = NULL;
819 after_where->adj_free = entry->start - after_where->end;
820 vm_map_entry_set_max_free(after_where);
821 } else {
822 entry->right = map->root;
823 entry->left = NULL;
824 }
825 entry->adj_free = (entry->next == &map->header ? map->max_offset :
826 entry->next->start) - entry->end;
827 vm_map_entry_set_max_free(entry);
828 map->root = entry;
829 }
830
831 static void
832 vm_map_entry_unlink(vm_map_t map,
833 vm_map_entry_t entry)
834 {
835 vm_map_entry_t next, prev, root;
836
837 if (entry != map->root)
838 vm_map_entry_splay(entry->start, map->root);
839 if (entry->left == NULL)
840 root = entry->right;
841 else {
842 root = vm_map_entry_splay(entry->start, entry->left);
843 root->right = entry->right;
844 root->adj_free = (entry->next == &map->header ? map->max_offset :
845 entry->next->start) - root->end;
846 vm_map_entry_set_max_free(root);
847 }
848 map->root = root;
849
850 prev = entry->prev;
851 next = entry->next;
852 next->prev = prev;
853 prev->next = next;
854 map->nentries--;
855 CTR3(KTR_VM, "vm_map_entry_unlink: map %p, nentries %d, entry %p", map,
856 map->nentries, entry);
857 }
858
859 /*
860 * vm_map_entry_resize_free:
861 *
862 * Recompute the amount of free space following a vm_map_entry
863 * and propagate that value up the tree. Call this function after
864 * resizing a map entry in-place, that is, without a call to
865 * vm_map_entry_link() or _unlink().
866 *
867 * The map must be locked, and leaves it so.
868 */
869 static void
870 vm_map_entry_resize_free(vm_map_t map, vm_map_entry_t entry)
871 {
872
873 /*
874 * Using splay trees without parent pointers, propagating
875 * max_free up the tree is done by moving the entry to the
876 * root and making the change there.
877 */
878 if (entry != map->root)
879 map->root = vm_map_entry_splay(entry->start, map->root);
880
881 entry->adj_free = (entry->next == &map->header ? map->max_offset :
882 entry->next->start) - entry->end;
883 vm_map_entry_set_max_free(entry);
884 }
885
886 /*
887 * vm_map_lookup_entry: [ internal use only ]
888 *
889 * Finds the map entry containing (or
890 * immediately preceding) the specified address
891 * in the given map; the entry is returned
892 * in the "entry" parameter. The boolean
893 * result indicates whether the address is
894 * actually contained in the map.
895 */
896 boolean_t
897 vm_map_lookup_entry(
898 vm_map_t map,
899 vm_offset_t address,
900 vm_map_entry_t *entry) /* OUT */
901 {
902 vm_map_entry_t cur;
903
904 cur = vm_map_entry_splay(address, map->root);
905 if (cur == NULL)
906 *entry = &map->header;
907 else {
908 map->root = cur;
909
910 if (address >= cur->start) {
911 *entry = cur;
912 if (cur->end > address)
913 return (TRUE);
914 } else
915 *entry = cur->prev;
916 }
917 return (FALSE);
918 }
919
920 /*
921 * vm_map_insert:
922 *
923 * Inserts the given whole VM object into the target
924 * map at the specified address range. The object's
925 * size should match that of the address range.
926 *
927 * Requires that the map be locked, and leaves it so.
928 *
929 * If object is non-NULL, ref count must be bumped by caller
930 * prior to making call to account for the new entry.
931 */
932 int
933 vm_map_insert(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
934 vm_offset_t start, vm_offset_t end, vm_prot_t prot, vm_prot_t max,
935 int cow)
936 {
937 vm_map_entry_t new_entry;
938 vm_map_entry_t prev_entry;
939 vm_map_entry_t temp_entry;
940 vm_eflags_t protoeflags;
941
942 /*
943 * Check that the start and end points are not bogus.
944 */
945 if ((start < map->min_offset) || (end > map->max_offset) ||
946 (start >= end))
947 return (KERN_INVALID_ADDRESS);
948
949 /*
950 * Find the entry prior to the proposed starting address; if it's part
951 * of an existing entry, this range is bogus.
952 */
953 if (vm_map_lookup_entry(map, start, &temp_entry))
954 return (KERN_NO_SPACE);
955
956 prev_entry = temp_entry;
957
958 /*
959 * Assert that the next entry doesn't overlap the end point.
960 */
961 if ((prev_entry->next != &map->header) &&
962 (prev_entry->next->start < end))
963 return (KERN_NO_SPACE);
964
965 protoeflags = 0;
966
967 if (cow & MAP_COPY_ON_WRITE)
968 protoeflags |= MAP_ENTRY_COW|MAP_ENTRY_NEEDS_COPY;
969
970 if (cow & MAP_NOFAULT) {
971 protoeflags |= MAP_ENTRY_NOFAULT;
972
973 KASSERT(object == NULL,
974 ("vm_map_insert: paradoxical MAP_NOFAULT request"));
975 }
976 if (cow & MAP_DISABLE_SYNCER)
977 protoeflags |= MAP_ENTRY_NOSYNC;
978 if (cow & MAP_DISABLE_COREDUMP)
979 protoeflags |= MAP_ENTRY_NOCOREDUMP;
980
981 if (object != NULL) {
982 /*
983 * OBJ_ONEMAPPING must be cleared unless this mapping
984 * is trivially proven to be the only mapping for any
985 * of the object's pages. (Object granularity
986 * reference counting is insufficient to recognize
987 * aliases with precision.)
988 */
989 VM_OBJECT_LOCK(object);
990 if (object->ref_count > 1 || object->shadow_count != 0)
991 vm_object_clear_flag(object, OBJ_ONEMAPPING);
992 VM_OBJECT_UNLOCK(object);
993 }
994 else if ((prev_entry != &map->header) &&
995 (prev_entry->eflags == protoeflags) &&
996 (prev_entry->end == start) &&
997 (prev_entry->wired_count == 0) &&
998 ((prev_entry->object.vm_object == NULL) ||
999 vm_object_coalesce(prev_entry->object.vm_object,
1000 prev_entry->offset,
1001 (vm_size_t)(prev_entry->end - prev_entry->start),
1002 (vm_size_t)(end - prev_entry->end)))) {
1003 /*
1004 * We were able to extend the object. Determine if we
1005 * can extend the previous map entry to include the
1006 * new range as well.
1007 */
1008 if ((prev_entry->inheritance == VM_INHERIT_DEFAULT) &&
1009 (prev_entry->protection == prot) &&
1010 (prev_entry->max_protection == max)) {
1011 map->size += (end - prev_entry->end);
1012 prev_entry->end = end;
1013 vm_map_entry_resize_free(map, prev_entry);
1014 vm_map_simplify_entry(map, prev_entry);
1015 return (KERN_SUCCESS);
1016 }
1017
1018 /*
1019 * If we can extend the object but cannot extend the
1020 * map entry, we have to create a new map entry. We
1021 * must bump the ref count on the extended object to
1022 * account for it. object may be NULL.
1023 */
1024 object = prev_entry->object.vm_object;
1025 offset = prev_entry->offset +
1026 (prev_entry->end - prev_entry->start);
1027 vm_object_reference(object);
1028 }
1029
1030 /*
1031 * NOTE: if conditionals fail, object can be NULL here. This occurs
1032 * in things like the buffer map where we manage kva but do not manage
1033 * backing objects.
1034 */
1035
1036 /*
1037 * Create a new entry
1038 */
1039 new_entry = vm_map_entry_create(map);
1040 new_entry->start = start;
1041 new_entry->end = end;
1042
1043 new_entry->eflags = protoeflags;
1044 new_entry->object.vm_object = object;
1045 new_entry->offset = offset;
1046 new_entry->avail_ssize = 0;
1047
1048 new_entry->inheritance = VM_INHERIT_DEFAULT;
1049 new_entry->protection = prot;
1050 new_entry->max_protection = max;
1051 new_entry->wired_count = 0;
1052
1053 /*
1054 * Insert the new entry into the list
1055 */
1056 vm_map_entry_link(map, prev_entry, new_entry);
1057 map->size += new_entry->end - new_entry->start;
1058
1059 #if 0
1060 /*
1061 * Temporarily removed to avoid MAP_STACK panic, due to
1062 * MAP_STACK being a huge hack. Will be added back in
1063 * when MAP_STACK (and the user stack mapping) is fixed.
1064 */
1065 /*
1066 * It may be possible to simplify the entry
1067 */
1068 vm_map_simplify_entry(map, new_entry);
1069 #endif
1070
1071 if (cow & (MAP_PREFAULT|MAP_PREFAULT_PARTIAL)) {
1072 vm_map_pmap_enter(map, start, prot,
1073 object, OFF_TO_IDX(offset), end - start,
1074 cow & MAP_PREFAULT_PARTIAL);
1075 }
1076
1077 return (KERN_SUCCESS);
1078 }
1079
1080 /*
1081 * vm_map_findspace:
1082 *
1083 * Find the first fit (lowest VM address) for "length" free bytes
1084 * beginning at address >= start in the given map.
1085 *
1086 * In a vm_map_entry, "adj_free" is the amount of free space
1087 * adjacent (higher address) to this entry, and "max_free" is the
1088 * maximum amount of contiguous free space in its subtree. This
1089 * allows finding a free region in one path down the tree, so
1090 * O(log n) amortized with splay trees.
1091 *
1092 * The map must be locked, and leaves it so.
1093 *
1094 * Returns: 0 on success, and starting address in *addr,
1095 * 1 if insufficient space.
1096 */
1097 int
1098 vm_map_findspace(vm_map_t map, vm_offset_t start, vm_size_t length,
1099 vm_offset_t *addr) /* OUT */
1100 {
1101 vm_map_entry_t entry;
1102 vm_offset_t end, st;
1103
1104 /*
1105 * Request must fit within min/max VM address and must avoid
1106 * address wrap.
1107 */
1108 if (start < map->min_offset)
1109 start = map->min_offset;
1110 if (start + length > map->max_offset || start + length < start)
1111 return (1);
1112
1113 /* Empty tree means wide open address space. */
1114 if (map->root == NULL) {
1115 *addr = start;
1116 goto found;
1117 }
1118
1119 /*
1120 * After splay, if start comes before root node, then there
1121 * must be a gap from start to the root.
1122 */
1123 map->root = vm_map_entry_splay(start, map->root);
1124 if (start + length <= map->root->start) {
1125 *addr = start;
1126 goto found;
1127 }
1128
1129 /*
1130 * Root is the last node that might begin its gap before
1131 * start, and this is the last comparison where address
1132 * wrap might be a problem.
1133 */
1134 st = (start > map->root->end) ? start : map->root->end;
1135 if (length <= map->root->end + map->root->adj_free - st) {
1136 *addr = st;
1137 goto found;
1138 }
1139
1140 /* With max_free, can immediately tell if no solution. */
1141 entry = map->root->right;
1142 if (entry == NULL || length > entry->max_free)
1143 return (1);
1144
1145 /*
1146 * Search the right subtree in the order: left subtree, root,
1147 * right subtree (first fit). The previous splay implies that
1148 * all regions in the right subtree have addresses > start.
1149 */
1150 while (entry != NULL) {
1151 if (entry->left != NULL && entry->left->max_free >= length)
1152 entry = entry->left;
1153 else if (entry->adj_free >= length) {
1154 *addr = entry->end;
1155 goto found;
1156 } else
1157 entry = entry->right;
1158 }
1159
1160 /* Can't get here, so panic if we do. */
1161 panic("vm_map_findspace: max_free corrupt");
1162
1163 found:
1164 /* Expand the kernel pmap, if necessary. */
1165 if (map == kernel_map) {
1166 end = round_page(*addr + length);
1167 if (end > kernel_vm_end)
1168 pmap_growkernel(end);
1169 }
1170 return (0);
1171 }
1172
1173 int
1174 vm_map_fixed(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
1175 vm_offset_t start, vm_size_t length, vm_prot_t prot,
1176 vm_prot_t max, int cow)
1177 {
1178 vm_offset_t end;
1179 int result;
1180
1181 vm_map_lock(map);
1182 end = start + length;
1183 VM_MAP_RANGE_CHECK(map, start, end);
1184 (void) vm_map_delete(map, start, end);
1185 result = vm_map_insert(map, object, offset, start, end, prot,
1186 max, cow);
1187 vm_map_unlock(map);
1188 return (result);
1189 }
1190
1191 /*
1192 * vm_map_find finds an unallocated region in the target address
1193 * map with the given length. The search is defined to be
1194 * first-fit from the specified address; the region found is
1195 * returned in the same parameter.
1196 *
1197 * If object is non-NULL, ref count must be bumped by caller
1198 * prior to making call to account for the new entry.
1199 */
1200 int
1201 vm_map_find(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
1202 vm_offset_t *addr, /* IN/OUT */
1203 vm_size_t length, int find_space, vm_prot_t prot,
1204 vm_prot_t max, int cow)
1205 {
1206 vm_offset_t start;
1207 int result;
1208
1209 start = *addr;
1210 vm_map_lock(map);
1211 do {
1212 if (find_space != VMFS_NO_SPACE) {
1213 if (vm_map_findspace(map, start, length, addr)) {
1214 vm_map_unlock(map);
1215 return (KERN_NO_SPACE);
1216 }
1217 if (find_space == VMFS_ALIGNED_SPACE)
1218 pmap_align_superpage(object, offset, addr,
1219 length);
1220 start = *addr;
1221 }
1222 result = vm_map_insert(map, object, offset, start, start +
1223 length, prot, max, cow);
1224 } while (result == KERN_NO_SPACE && find_space == VMFS_ALIGNED_SPACE);
1225 vm_map_unlock(map);
1226 return (result);
1227 }
1228
1229 /*
1230 * vm_map_simplify_entry:
1231 *
1232 * Simplify the given map entry by merging with either neighbor. This
1233 * routine also has the ability to merge with both neighbors.
1234 *
1235 * The map must be locked.
1236 *
1237 * This routine guarentees that the passed entry remains valid (though
1238 * possibly extended). When merging, this routine may delete one or
1239 * both neighbors.
1240 */
1241 void
1242 vm_map_simplify_entry(vm_map_t map, vm_map_entry_t entry)
1243 {
1244 vm_map_entry_t next, prev;
1245 vm_size_t prevsize, esize;
1246
1247 if (entry->eflags & (MAP_ENTRY_IN_TRANSITION | MAP_ENTRY_IS_SUB_MAP))
1248 return;
1249
1250 prev = entry->prev;
1251 if (prev != &map->header) {
1252 prevsize = prev->end - prev->start;
1253 if ( (prev->end == entry->start) &&
1254 (prev->object.vm_object == entry->object.vm_object) &&
1255 (!prev->object.vm_object ||
1256 (prev->offset + prevsize == entry->offset)) &&
1257 (prev->eflags == entry->eflags) &&
1258 (prev->protection == entry->protection) &&
1259 (prev->max_protection == entry->max_protection) &&
1260 (prev->inheritance == entry->inheritance) &&
1261 (prev->wired_count == entry->wired_count)) {
1262 vm_map_entry_unlink(map, prev);
1263 entry->start = prev->start;
1264 entry->offset = prev->offset;
1265 if (entry->prev != &map->header)
1266 vm_map_entry_resize_free(map, entry->prev);
1267 if (prev->object.vm_object)
1268 vm_object_deallocate(prev->object.vm_object);
1269 vm_map_entry_dispose(map, prev);
1270 }
1271 }
1272
1273 next = entry->next;
1274 if (next != &map->header) {
1275 esize = entry->end - entry->start;
1276 if ((entry->end == next->start) &&
1277 (next->object.vm_object == entry->object.vm_object) &&
1278 (!entry->object.vm_object ||
1279 (entry->offset + esize == next->offset)) &&
1280 (next->eflags == entry->eflags) &&
1281 (next->protection == entry->protection) &&
1282 (next->max_protection == entry->max_protection) &&
1283 (next->inheritance == entry->inheritance) &&
1284 (next->wired_count == entry->wired_count)) {
1285 vm_map_entry_unlink(map, next);
1286 entry->end = next->end;
1287 vm_map_entry_resize_free(map, entry);
1288 if (next->object.vm_object)
1289 vm_object_deallocate(next->object.vm_object);
1290 vm_map_entry_dispose(map, next);
1291 }
1292 }
1293 }
1294 /*
1295 * vm_map_clip_start: [ internal use only ]
1296 *
1297 * Asserts that the given entry begins at or after
1298 * the specified address; if necessary,
1299 * it splits the entry into two.
1300 */
1301 #define vm_map_clip_start(map, entry, startaddr) \
1302 { \
1303 if (startaddr > entry->start) \
1304 _vm_map_clip_start(map, entry, startaddr); \
1305 }
1306
1307 /*
1308 * This routine is called only when it is known that
1309 * the entry must be split.
1310 */
1311 static void
1312 _vm_map_clip_start(vm_map_t map, vm_map_entry_t entry, vm_offset_t start)
1313 {
1314 vm_map_entry_t new_entry;
1315
1316 /*
1317 * Split off the front portion -- note that we must insert the new
1318 * entry BEFORE this one, so that this entry has the specified
1319 * starting address.
1320 */
1321 vm_map_simplify_entry(map, entry);
1322
1323 /*
1324 * If there is no object backing this entry, we might as well create
1325 * one now. If we defer it, an object can get created after the map
1326 * is clipped, and individual objects will be created for the split-up
1327 * map. This is a bit of a hack, but is also about the best place to
1328 * put this improvement.
1329 */
1330 if (entry->object.vm_object == NULL && !map->system_map) {
1331 vm_object_t object;
1332 object = vm_object_allocate(OBJT_DEFAULT,
1333 atop(entry->end - entry->start));
1334 entry->object.vm_object = object;
1335 entry->offset = 0;
1336 }
1337
1338 new_entry = vm_map_entry_create(map);
1339 *new_entry = *entry;
1340
1341 new_entry->end = start;
1342 entry->offset += (start - entry->start);
1343 entry->start = start;
1344
1345 vm_map_entry_link(map, entry->prev, new_entry);
1346
1347 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {
1348 vm_object_reference(new_entry->object.vm_object);
1349 }
1350 }
1351
1352 /*
1353 * vm_map_clip_end: [ internal use only ]
1354 *
1355 * Asserts that the given entry ends at or before
1356 * the specified address; if necessary,
1357 * it splits the entry into two.
1358 */
1359 #define vm_map_clip_end(map, entry, endaddr) \
1360 { \
1361 if ((endaddr) < (entry->end)) \
1362 _vm_map_clip_end((map), (entry), (endaddr)); \
1363 }
1364
1365 /*
1366 * This routine is called only when it is known that
1367 * the entry must be split.
1368 */
1369 static void
1370 _vm_map_clip_end(vm_map_t map, vm_map_entry_t entry, vm_offset_t end)
1371 {
1372 vm_map_entry_t new_entry;
1373
1374 /*
1375 * If there is no object backing this entry, we might as well create
1376 * one now. If we defer it, an object can get created after the map
1377 * is clipped, and individual objects will be created for the split-up
1378 * map. This is a bit of a hack, but is also about the best place to
1379 * put this improvement.
1380 */
1381 if (entry->object.vm_object == NULL && !map->system_map) {
1382 vm_object_t object;
1383 object = vm_object_allocate(OBJT_DEFAULT,
1384 atop(entry->end - entry->start));
1385 entry->object.vm_object = object;
1386 entry->offset = 0;
1387 }
1388
1389 /*
1390 * Create a new entry and insert it AFTER the specified entry
1391 */
1392 new_entry = vm_map_entry_create(map);
1393 *new_entry = *entry;
1394
1395 new_entry->start = entry->end = end;
1396 new_entry->offset += (end - entry->start);
1397
1398 vm_map_entry_link(map, entry, new_entry);
1399
1400 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {
1401 vm_object_reference(new_entry->object.vm_object);
1402 }
1403 }
1404
1405 /*
1406 * vm_map_submap: [ kernel use only ]
1407 *
1408 * Mark the given range as handled by a subordinate map.
1409 *
1410 * This range must have been created with vm_map_find,
1411 * and no other operations may have been performed on this
1412 * range prior to calling vm_map_submap.
1413 *
1414 * Only a limited number of operations can be performed
1415 * within this rage after calling vm_map_submap:
1416 * vm_fault
1417 * [Don't try vm_map_copy!]
1418 *
1419 * To remove a submapping, one must first remove the
1420 * range from the superior map, and then destroy the
1421 * submap (if desired). [Better yet, don't try it.]
1422 */
1423 int
1424 vm_map_submap(
1425 vm_map_t map,
1426 vm_offset_t start,
1427 vm_offset_t end,
1428 vm_map_t submap)
1429 {
1430 vm_map_entry_t entry;
1431 int result = KERN_INVALID_ARGUMENT;
1432
1433 vm_map_lock(map);
1434
1435 VM_MAP_RANGE_CHECK(map, start, end);
1436
1437 if (vm_map_lookup_entry(map, start, &entry)) {
1438 vm_map_clip_start(map, entry, start);
1439 } else
1440 entry = entry->next;
1441
1442 vm_map_clip_end(map, entry, end);
1443
1444 if ((entry->start == start) && (entry->end == end) &&
1445 ((entry->eflags & MAP_ENTRY_COW) == 0) &&
1446 (entry->object.vm_object == NULL)) {
1447 entry->object.sub_map = submap;
1448 entry->eflags |= MAP_ENTRY_IS_SUB_MAP;
1449 result = KERN_SUCCESS;
1450 }
1451 vm_map_unlock(map);
1452
1453 return (result);
1454 }
1455
1456 /*
1457 * The maximum number of pages to map
1458 */
1459 #define MAX_INIT_PT 96
1460
1461 /*
1462 * vm_map_pmap_enter:
1463 *
1464 * Preload read-only mappings for the given object's resident pages into
1465 * the given map. This eliminates the soft faults on process startup and
1466 * immediately after an mmap(2). Unless the given flags include
1467 * MAP_PREFAULT_MADVISE, cached pages are not reactivated and mapped.
1468 */
1469 void
1470 vm_map_pmap_enter(vm_map_t map, vm_offset_t addr, vm_prot_t prot,
1471 vm_object_t object, vm_pindex_t pindex, vm_size_t size, int flags)
1472 {
1473 vm_offset_t start;
1474 vm_page_t p, p_start;
1475 vm_pindex_t psize, tmpidx;
1476 boolean_t are_queues_locked;
1477
1478 if ((prot & (VM_PROT_READ | VM_PROT_EXECUTE)) == 0 || object == NULL)
1479 return;
1480 VM_OBJECT_LOCK(object);
1481 if (object->type == OBJT_DEVICE || object->type == OBJT_SG) {
1482 pmap_object_init_pt(map->pmap, addr, object, pindex, size);
1483 goto unlock_return;
1484 }
1485
1486 psize = atop(size);
1487
1488 if ((flags & MAP_PREFAULT_PARTIAL) && psize > MAX_INIT_PT &&
1489 object->resident_page_count > MAX_INIT_PT)
1490 goto unlock_return;
1491
1492 if (psize + pindex > object->size) {
1493 if (object->size < pindex)
1494 goto unlock_return;
1495 psize = object->size - pindex;
1496 }
1497
1498 are_queues_locked = FALSE;
1499 start = 0;
1500 p_start = NULL;
1501
1502 if ((p = TAILQ_FIRST(&object->memq)) != NULL) {
1503 if (p->pindex < pindex) {
1504 p = vm_page_splay(pindex, object->root);
1505 if ((object->root = p)->pindex < pindex)
1506 p = TAILQ_NEXT(p, listq);
1507 }
1508 }
1509 /*
1510 * Assert: the variable p is either (1) the page with the
1511 * least pindex greater than or equal to the parameter pindex
1512 * or (2) NULL.
1513 */
1514 for (;
1515 p != NULL && (tmpidx = p->pindex - pindex) < psize;
1516 p = TAILQ_NEXT(p, listq)) {
1517 /*
1518 * don't allow an madvise to blow away our really
1519 * free pages allocating pv entries.
1520 */
1521 if ((flags & MAP_PREFAULT_MADVISE) &&
1522 cnt.v_free_count < cnt.v_free_reserved) {
1523 psize = tmpidx;
1524 break;
1525 }
1526 if ((p->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL &&
1527 (p->busy == 0)) {
1528 if (p_start == NULL) {
1529 start = addr + ptoa(tmpidx);
1530 p_start = p;
1531 }
1532 } else if (p_start != NULL) {
1533 if (!are_queues_locked) {
1534 are_queues_locked = TRUE;
1535 vm_page_lock_queues();
1536 }
1537 pmap_enter_object(map->pmap, start, addr +
1538 ptoa(tmpidx), p_start, prot);
1539 p_start = NULL;
1540 }
1541 }
1542 if (p_start != NULL) {
1543 if (!are_queues_locked) {
1544 are_queues_locked = TRUE;
1545 vm_page_lock_queues();
1546 }
1547 pmap_enter_object(map->pmap, start, addr + ptoa(psize),
1548 p_start, prot);
1549 }
1550 if (are_queues_locked)
1551 vm_page_unlock_queues();
1552 unlock_return:
1553 VM_OBJECT_UNLOCK(object);
1554 }
1555
1556 /*
1557 * vm_map_protect:
1558 *
1559 * Sets the protection of the specified address
1560 * region in the target map. If "set_max" is
1561 * specified, the maximum protection is to be set;
1562 * otherwise, only the current protection is affected.
1563 */
1564 int
1565 vm_map_protect(vm_map_t map, vm_offset_t start, vm_offset_t end,
1566 vm_prot_t new_prot, boolean_t set_max)
1567 {
1568 vm_map_entry_t current;
1569 vm_map_entry_t entry;
1570
1571 vm_map_lock(map);
1572
1573 VM_MAP_RANGE_CHECK(map, start, end);
1574
1575 if (vm_map_lookup_entry(map, start, &entry)) {
1576 vm_map_clip_start(map, entry, start);
1577 } else {
1578 entry = entry->next;
1579 }
1580
1581 /*
1582 * Make a first pass to check for protection violations.
1583 */
1584 current = entry;
1585 while ((current != &map->header) && (current->start < end)) {
1586 if (current->eflags & MAP_ENTRY_IS_SUB_MAP) {
1587 vm_map_unlock(map);
1588 return (KERN_INVALID_ARGUMENT);
1589 }
1590 if ((new_prot & current->max_protection) != new_prot) {
1591 vm_map_unlock(map);
1592 return (KERN_PROTECTION_FAILURE);
1593 }
1594 current = current->next;
1595 }
1596
1597 /*
1598 * Go back and fix up protections. [Note that clipping is not
1599 * necessary the second time.]
1600 */
1601 current = entry;
1602 while ((current != &map->header) && (current->start < end)) {
1603 vm_prot_t old_prot;
1604
1605 vm_map_clip_end(map, current, end);
1606
1607 old_prot = current->protection;
1608 if (set_max)
1609 current->protection =
1610 (current->max_protection = new_prot) &
1611 old_prot;
1612 else
1613 current->protection = new_prot;
1614
1615 /*
1616 * Update physical map if necessary. Worry about copy-on-write
1617 * here -- CHECK THIS XXX
1618 */
1619 if (current->protection != old_prot) {
1620 #define MASK(entry) (((entry)->eflags & MAP_ENTRY_COW) ? ~VM_PROT_WRITE : \
1621 VM_PROT_ALL)
1622 pmap_protect(map->pmap, current->start,
1623 current->end,
1624 current->protection & MASK(current));
1625 #undef MASK
1626 }
1627 vm_map_simplify_entry(map, current);
1628 current = current->next;
1629 }
1630 vm_map_unlock(map);
1631 return (KERN_SUCCESS);
1632 }
1633
1634 /*
1635 * vm_map_madvise:
1636 *
1637 * This routine traverses a processes map handling the madvise
1638 * system call. Advisories are classified as either those effecting
1639 * the vm_map_entry structure, or those effecting the underlying
1640 * objects.
1641 */
1642 int
1643 vm_map_madvise(
1644 vm_map_t map,
1645 vm_offset_t start,
1646 vm_offset_t end,
1647 int behav)
1648 {
1649 vm_map_entry_t current, entry;
1650 int modify_map = 0;
1651
1652 /*
1653 * Some madvise calls directly modify the vm_map_entry, in which case
1654 * we need to use an exclusive lock on the map and we need to perform
1655 * various clipping operations. Otherwise we only need a read-lock
1656 * on the map.
1657 */
1658 switch(behav) {
1659 case MADV_NORMAL:
1660 case MADV_SEQUENTIAL:
1661 case MADV_RANDOM:
1662 case MADV_NOSYNC:
1663 case MADV_AUTOSYNC:
1664 case MADV_NOCORE:
1665 case MADV_CORE:
1666 modify_map = 1;
1667 vm_map_lock(map);
1668 break;
1669 case MADV_WILLNEED:
1670 case MADV_DONTNEED:
1671 case MADV_FREE:
1672 vm_map_lock_read(map);
1673 break;
1674 default:
1675 return (KERN_INVALID_ARGUMENT);
1676 }
1677
1678 /*
1679 * Locate starting entry and clip if necessary.
1680 */
1681 VM_MAP_RANGE_CHECK(map, start, end);
1682
1683 if (vm_map_lookup_entry(map, start, &entry)) {
1684 if (modify_map)
1685 vm_map_clip_start(map, entry, start);
1686 } else {
1687 entry = entry->next;
1688 }
1689
1690 if (modify_map) {
1691 /*
1692 * madvise behaviors that are implemented in the vm_map_entry.
1693 *
1694 * We clip the vm_map_entry so that behavioral changes are
1695 * limited to the specified address range.
1696 */
1697 for (current = entry;
1698 (current != &map->header) && (current->start < end);
1699 current = current->next
1700 ) {
1701 if (current->eflags & MAP_ENTRY_IS_SUB_MAP)
1702 continue;
1703
1704 vm_map_clip_end(map, current, end);
1705
1706 switch (behav) {
1707 case MADV_NORMAL:
1708 vm_map_entry_set_behavior(current, MAP_ENTRY_BEHAV_NORMAL);
1709 break;
1710 case MADV_SEQUENTIAL:
1711 vm_map_entry_set_behavior(current, MAP_ENTRY_BEHAV_SEQUENTIAL);
1712 break;
1713 case MADV_RANDOM:
1714 vm_map_entry_set_behavior(current, MAP_ENTRY_BEHAV_RANDOM);
1715 break;
1716 case MADV_NOSYNC:
1717 current->eflags |= MAP_ENTRY_NOSYNC;
1718 break;
1719 case MADV_AUTOSYNC:
1720 current->eflags &= ~MAP_ENTRY_NOSYNC;
1721 break;
1722 case MADV_NOCORE:
1723 current->eflags |= MAP_ENTRY_NOCOREDUMP;
1724 break;
1725 case MADV_CORE:
1726 current->eflags &= ~MAP_ENTRY_NOCOREDUMP;
1727 break;
1728 default:
1729 break;
1730 }
1731 vm_map_simplify_entry(map, current);
1732 }
1733 vm_map_unlock(map);
1734 } else {
1735 vm_pindex_t pindex;
1736 int count;
1737
1738 /*
1739 * madvise behaviors that are implemented in the underlying
1740 * vm_object.
1741 *
1742 * Since we don't clip the vm_map_entry, we have to clip
1743 * the vm_object pindex and count.
1744 */
1745 for (current = entry;
1746 (current != &map->header) && (current->start < end);
1747 current = current->next
1748 ) {
1749 vm_offset_t useStart;
1750
1751 if (current->eflags & MAP_ENTRY_IS_SUB_MAP)
1752 continue;
1753
1754 pindex = OFF_TO_IDX(current->offset);
1755 count = atop(current->end - current->start);
1756 useStart = current->start;
1757
1758 if (current->start < start) {
1759 pindex += atop(start - current->start);
1760 count -= atop(start - current->start);
1761 useStart = start;
1762 }
1763 if (current->end > end)
1764 count -= atop(current->end - end);
1765
1766 if (count <= 0)
1767 continue;
1768
1769 vm_object_madvise(current->object.vm_object,
1770 pindex, count, behav);
1771 if (behav == MADV_WILLNEED) {
1772 vm_map_pmap_enter(map,
1773 useStart,
1774 current->protection,
1775 current->object.vm_object,
1776 pindex,
1777 (count << PAGE_SHIFT),
1778 MAP_PREFAULT_MADVISE
1779 );
1780 }
1781 }
1782 vm_map_unlock_read(map);
1783 }
1784 return (0);
1785 }
1786
1787
1788 /*
1789 * vm_map_inherit:
1790 *
1791 * Sets the inheritance of the specified address
1792 * range in the target map. Inheritance
1793 * affects how the map will be shared with
1794 * child maps at the time of vm_map_fork.
1795 */
1796 int
1797 vm_map_inherit(vm_map_t map, vm_offset_t start, vm_offset_t end,
1798 vm_inherit_t new_inheritance)
1799 {
1800 vm_map_entry_t entry;
1801 vm_map_entry_t temp_entry;
1802
1803 switch (new_inheritance) {
1804 case VM_INHERIT_NONE:
1805 case VM_INHERIT_COPY:
1806 case VM_INHERIT_SHARE:
1807 break;
1808 default:
1809 return (KERN_INVALID_ARGUMENT);
1810 }
1811 vm_map_lock(map);
1812 VM_MAP_RANGE_CHECK(map, start, end);
1813 if (vm_map_lookup_entry(map, start, &temp_entry)) {
1814 entry = temp_entry;
1815 vm_map_clip_start(map, entry, start);
1816 } else
1817 entry = temp_entry->next;
1818 while ((entry != &map->header) && (entry->start < end)) {
1819 vm_map_clip_end(map, entry, end);
1820 entry->inheritance = new_inheritance;
1821 vm_map_simplify_entry(map, entry);
1822 entry = entry->next;
1823 }
1824 vm_map_unlock(map);
1825 return (KERN_SUCCESS);
1826 }
1827
1828 /*
1829 * vm_map_unwire:
1830 *
1831 * Implements both kernel and user unwiring.
1832 */
1833 int
1834 vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
1835 int flags)
1836 {
1837 vm_map_entry_t entry, first_entry, tmp_entry;
1838 vm_offset_t saved_start;
1839 unsigned int last_timestamp;
1840 int rv;
1841 boolean_t need_wakeup, result, user_unwire;
1842
1843 user_unwire = (flags & VM_MAP_WIRE_USER) ? TRUE : FALSE;
1844 vm_map_lock(map);
1845 VM_MAP_RANGE_CHECK(map, start, end);
1846 if (!vm_map_lookup_entry(map, start, &first_entry)) {
1847 if (flags & VM_MAP_WIRE_HOLESOK)
1848 first_entry = first_entry->next;
1849 else {
1850 vm_map_unlock(map);
1851 return (KERN_INVALID_ADDRESS);
1852 }
1853 }
1854 last_timestamp = map->timestamp;
1855 entry = first_entry;
1856 while (entry != &map->header && entry->start < end) {
1857 if (entry->eflags & MAP_ENTRY_IN_TRANSITION) {
1858 /*
1859 * We have not yet clipped the entry.
1860 */
1861 saved_start = (start >= entry->start) ? start :
1862 entry->start;
1863 entry->eflags |= MAP_ENTRY_NEEDS_WAKEUP;
1864 if (vm_map_unlock_and_wait(map, user_unwire)) {
1865 /*
1866 * Allow interruption of user unwiring?
1867 */
1868 }
1869 vm_map_lock(map);
1870 if (last_timestamp+1 != map->timestamp) {
1871 /*
1872 * Look again for the entry because the map was
1873 * modified while it was unlocked.
1874 * Specifically, the entry may have been
1875 * clipped, merged, or deleted.
1876 */
1877 if (!vm_map_lookup_entry(map, saved_start,
1878 &tmp_entry)) {
1879 if (flags & VM_MAP_WIRE_HOLESOK)
1880 tmp_entry = tmp_entry->next;
1881 else {
1882 if (saved_start == start) {
1883 /*
1884 * First_entry has been deleted.
1885 */
1886 vm_map_unlock(map);
1887 return (KERN_INVALID_ADDRESS);
1888 }
1889 end = saved_start;
1890 rv = KERN_INVALID_ADDRESS;
1891 goto done;
1892 }
1893 }
1894 if (entry == first_entry)
1895 first_entry = tmp_entry;
1896 else
1897 first_entry = NULL;
1898 entry = tmp_entry;
1899 }
1900 last_timestamp = map->timestamp;
1901 continue;
1902 }
1903 vm_map_clip_start(map, entry, start);
1904 vm_map_clip_end(map, entry, end);
1905 /*
1906 * Mark the entry in case the map lock is released. (See
1907 * above.)
1908 */
1909 entry->eflags |= MAP_ENTRY_IN_TRANSITION;
1910 /*
1911 * Check the map for holes in the specified region.
1912 * If VM_MAP_WIRE_HOLESOK was specified, skip this check.
1913 */
1914 if (((flags & VM_MAP_WIRE_HOLESOK) == 0) &&
1915 (entry->end < end && (entry->next == &map->header ||
1916 entry->next->start > entry->end))) {
1917 end = entry->end;
1918 rv = KERN_INVALID_ADDRESS;
1919 goto done;
1920 }
1921 /*
1922 * If system unwiring, require that the entry is system wired.
1923 */
1924 if (!user_unwire &&
1925 vm_map_entry_system_wired_count(entry) == 0) {
1926 end = entry->end;
1927 rv = KERN_INVALID_ARGUMENT;
1928 goto done;
1929 }
1930 entry = entry->next;
1931 }
1932 rv = KERN_SUCCESS;
1933 done:
1934 need_wakeup = FALSE;
1935 if (first_entry == NULL) {
1936 result = vm_map_lookup_entry(map, start, &first_entry);
1937 if (!result && (flags & VM_MAP_WIRE_HOLESOK))
1938 first_entry = first_entry->next;
1939 else
1940 KASSERT(result, ("vm_map_unwire: lookup failed"));
1941 }
1942 entry = first_entry;
1943 while (entry != &map->header && entry->start < end) {
1944 if (rv == KERN_SUCCESS && (!user_unwire ||
1945 (entry->eflags & MAP_ENTRY_USER_WIRED))) {
1946 if (user_unwire)
1947 entry->eflags &= ~MAP_ENTRY_USER_WIRED;
1948 entry->wired_count--;
1949 if (entry->wired_count == 0) {
1950 /*
1951 * Retain the map lock.
1952 */
1953 vm_fault_unwire(map, entry->start, entry->end,
1954 entry->object.vm_object != NULL &&
1955 (entry->object.vm_object->type == OBJT_DEVICE ||
1956 entry->object.vm_object->type == OBJT_SG));
1957 }
1958 }
1959 KASSERT(entry->eflags & MAP_ENTRY_IN_TRANSITION,
1960 ("vm_map_unwire: in-transition flag missing"));
1961 entry->eflags &= ~MAP_ENTRY_IN_TRANSITION;
1962 if (entry->eflags & MAP_ENTRY_NEEDS_WAKEUP) {
1963 entry->eflags &= ~MAP_ENTRY_NEEDS_WAKEUP;
1964 need_wakeup = TRUE;
1965 }
1966 vm_map_simplify_entry(map, entry);
1967 entry = entry->next;
1968 }
1969 vm_map_unlock(map);
1970 if (need_wakeup)
1971 vm_map_wakeup(map);
1972 return (rv);
1973 }
1974
1975 /*
1976 * vm_map_wire:
1977 *
1978 * Implements both kernel and user wiring.
1979 */
1980 int
1981 vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end,
1982 int flags)
1983 {
1984 vm_map_entry_t entry, first_entry, tmp_entry;
1985 vm_offset_t saved_end, saved_start;
1986 unsigned int last_timestamp;
1987 int rv;
1988 boolean_t fictitious, need_wakeup, result, user_wire;
1989
1990 user_wire = (flags & VM_MAP_WIRE_USER) ? TRUE : FALSE;
1991 vm_map_lock(map);
1992 VM_MAP_RANGE_CHECK(map, start, end);
1993 if (!vm_map_lookup_entry(map, start, &first_entry)) {
1994 if (flags & VM_MAP_WIRE_HOLESOK)
1995 first_entry = first_entry->next;
1996 else {
1997 vm_map_unlock(map);
1998 return (KERN_INVALID_ADDRESS);
1999 }
2000 }
2001 last_timestamp = map->timestamp;
2002 entry = first_entry;
2003 while (entry != &map->header && entry->start < end) {
2004 if (entry->eflags & MAP_ENTRY_IN_TRANSITION) {
2005 /*
2006 * We have not yet clipped the entry.
2007 */
2008 saved_start = (start >= entry->start) ? start :
2009 entry->start;
2010 entry->eflags |= MAP_ENTRY_NEEDS_WAKEUP;
2011 if (vm_map_unlock_and_wait(map, user_wire)) {
2012 /*
2013 * Allow interruption of user wiring?
2014 */
2015 }
2016 vm_map_lock(map);
2017 if (last_timestamp + 1 != map->timestamp) {
2018 /*
2019 * Look again for the entry because the map was
2020 * modified while it was unlocked.
2021 * Specifically, the entry may have been
2022 * clipped, merged, or deleted.
2023 */
2024 if (!vm_map_lookup_entry(map, saved_start,
2025 &tmp_entry)) {
2026 if (flags & VM_MAP_WIRE_HOLESOK)
2027 tmp_entry = tmp_entry->next;
2028 else {
2029 if (saved_start == start) {
2030 /*
2031 * first_entry has been deleted.
2032 */
2033 vm_map_unlock(map);
2034 return (KERN_INVALID_ADDRESS);
2035 }
2036 end = saved_start;
2037 rv = KERN_INVALID_ADDRESS;
2038 goto done;
2039 }
2040 }
2041 if (entry == first_entry)
2042 first_entry = tmp_entry;
2043 else
2044 first_entry = NULL;
2045 entry = tmp_entry;
2046 }
2047 last_timestamp = map->timestamp;
2048 continue;
2049 }
2050 vm_map_clip_start(map, entry, start);
2051 vm_map_clip_end(map, entry, end);
2052 /*
2053 * Mark the entry in case the map lock is released. (See
2054 * above.)
2055 */
2056 entry->eflags |= MAP_ENTRY_IN_TRANSITION;
2057 /*
2058 *
2059 */
2060 if (entry->wired_count == 0) {
2061 if ((entry->protection & (VM_PROT_READ|VM_PROT_EXECUTE))
2062 == 0) {
2063 entry->eflags |= MAP_ENTRY_WIRE_SKIPPED;
2064 if ((flags & VM_MAP_WIRE_HOLESOK) == 0) {
2065 end = entry->end;
2066 rv = KERN_INVALID_ADDRESS;
2067 goto done;
2068 }
2069 goto next_entry;
2070 }
2071 entry->wired_count++;
2072 saved_start = entry->start;
2073 saved_end = entry->end;
2074 fictitious = entry->object.vm_object != NULL &&
2075 (entry->object.vm_object->type == OBJT_DEVICE ||
2076 entry->object.vm_object->type == OBJT_SG);
2077 /*
2078 * Release the map lock, relying on the in-transition
2079 * mark.
2080 */
2081 vm_map_unlock(map);
2082 rv = vm_fault_wire(map, saved_start, saved_end,
2083 user_wire, fictitious);
2084 vm_map_lock(map);
2085 if (last_timestamp + 1 != map->timestamp) {
2086 /*
2087 * Look again for the entry because the map was
2088 * modified while it was unlocked. The entry
2089 * may have been clipped, but NOT merged or
2090 * deleted.
2091 */
2092 result = vm_map_lookup_entry(map, saved_start,
2093 &tmp_entry);
2094 KASSERT(result, ("vm_map_wire: lookup failed"));
2095 if (entry == first_entry)
2096 first_entry = tmp_entry;
2097 else
2098 first_entry = NULL;
2099 entry = tmp_entry;
2100 while (entry->end < saved_end) {
2101 if (rv != KERN_SUCCESS) {
2102 KASSERT(entry->wired_count == 1,
2103 ("vm_map_wire: bad count"));
2104 entry->wired_count = -1;
2105 }
2106 entry = entry->next;
2107 }
2108 }
2109 last_timestamp = map->timestamp;
2110 if (rv != KERN_SUCCESS) {
2111 KASSERT(entry->wired_count == 1,
2112 ("vm_map_wire: bad count"));
2113 /*
2114 * Assign an out-of-range value to represent
2115 * the failure to wire this entry.
2116 */
2117 entry->wired_count = -1;
2118 end = entry->end;
2119 goto done;
2120 }
2121 } else if (!user_wire ||
2122 (entry->eflags & MAP_ENTRY_USER_WIRED) == 0) {
2123 entry->wired_count++;
2124 }
2125 /*
2126 * Check the map for holes in the specified region.
2127 * If VM_MAP_WIRE_HOLESOK was specified, skip this check.
2128 */
2129 next_entry:
2130 if (((flags & VM_MAP_WIRE_HOLESOK) == 0) &&
2131 (entry->end < end && (entry->next == &map->header ||
2132 entry->next->start > entry->end))) {
2133 end = entry->end;
2134 rv = KERN_INVALID_ADDRESS;
2135 goto done;
2136 }
2137 entry = entry->next;
2138 }
2139 rv = KERN_SUCCESS;
2140 done:
2141 need_wakeup = FALSE;
2142 if (first_entry == NULL) {
2143 result = vm_map_lookup_entry(map, start, &first_entry);
2144 if (!result && (flags & VM_MAP_WIRE_HOLESOK))
2145 first_entry = first_entry->next;
2146 else
2147 KASSERT(result, ("vm_map_wire: lookup failed"));
2148 }
2149 entry = first_entry;
2150 while (entry != &map->header && entry->start < end) {
2151 if ((entry->eflags & MAP_ENTRY_WIRE_SKIPPED) != 0)
2152 goto next_entry_done;
2153 if (rv == KERN_SUCCESS) {
2154 if (user_wire)
2155 entry->eflags |= MAP_ENTRY_USER_WIRED;
2156 } else if (entry->wired_count == -1) {
2157 /*
2158 * Wiring failed on this entry. Thus, unwiring is
2159 * unnecessary.
2160 */
2161 entry->wired_count = 0;
2162 } else {
2163 if (!user_wire ||
2164 (entry->eflags & MAP_ENTRY_USER_WIRED) == 0)
2165 entry->wired_count--;
2166 if (entry->wired_count == 0) {
2167 /*
2168 * Retain the map lock.
2169 */
2170 vm_fault_unwire(map, entry->start, entry->end,
2171 entry->object.vm_object != NULL &&
2172 (entry->object.vm_object->type == OBJT_DEVICE ||
2173 entry->object.vm_object->type == OBJT_SG));
2174 }
2175 }
2176 next_entry_done:
2177 KASSERT(entry->eflags & MAP_ENTRY_IN_TRANSITION,
2178 ("vm_map_wire: in-transition flag missing"));
2179 entry->eflags &= ~(MAP_ENTRY_IN_TRANSITION|MAP_ENTRY_WIRE_SKIPPED);
2180 if (entry->eflags & MAP_ENTRY_NEEDS_WAKEUP) {
2181 entry->eflags &= ~MAP_ENTRY_NEEDS_WAKEUP;
2182 need_wakeup = TRUE;
2183 }
2184 vm_map_simplify_entry(map, entry);
2185 entry = entry->next;
2186 }
2187 vm_map_unlock(map);
2188 if (need_wakeup)
2189 vm_map_wakeup(map);
2190 return (rv);
2191 }
2192
2193 /*
2194 * vm_map_sync
2195 *
2196 * Push any dirty cached pages in the address range to their pager.
2197 * If syncio is TRUE, dirty pages are written synchronously.
2198 * If invalidate is TRUE, any cached pages are freed as well.
2199 *
2200 * If the size of the region from start to end is zero, we are
2201 * supposed to flush all modified pages within the region containing
2202 * start. Unfortunately, a region can be split or coalesced with
2203 * neighboring regions, making it difficult to determine what the
2204 * original region was. Therefore, we approximate this requirement by
2205 * flushing the current region containing start.
2206 *
2207 * Returns an error if any part of the specified range is not mapped.
2208 */
2209 int
2210 vm_map_sync(
2211 vm_map_t map,
2212 vm_offset_t start,
2213 vm_offset_t end,
2214 boolean_t syncio,
2215 boolean_t invalidate)
2216 {
2217 vm_map_entry_t current;
2218 vm_map_entry_t entry;
2219 vm_size_t size;
2220 vm_object_t object;
2221 vm_ooffset_t offset;
2222
2223 vm_map_lock_read(map);
2224 VM_MAP_RANGE_CHECK(map, start, end);
2225 if (!vm_map_lookup_entry(map, start, &entry)) {
2226 vm_map_unlock_read(map);
2227 return (KERN_INVALID_ADDRESS);
2228 } else if (start == end) {
2229 start = entry->start;
2230 end = entry->end;
2231 }
2232 /*
2233 * Make a first pass to check for user-wired memory and holes.
2234 */
2235 for (current = entry; current != &map->header && current->start < end;
2236 current = current->next) {
2237 if (invalidate && (current->eflags & MAP_ENTRY_USER_WIRED)) {
2238 vm_map_unlock_read(map);
2239 return (KERN_INVALID_ARGUMENT);
2240 }
2241 if (end > current->end &&
2242 (current->next == &map->header ||
2243 current->end != current->next->start)) {
2244 vm_map_unlock_read(map);
2245 return (KERN_INVALID_ADDRESS);
2246 }
2247 }
2248
2249 if (invalidate)
2250 pmap_remove(map->pmap, start, end);
2251
2252 /*
2253 * Make a second pass, cleaning/uncaching pages from the indicated
2254 * objects as we go.
2255 */
2256 for (current = entry; current != &map->header && current->start < end;
2257 current = current->next) {
2258 offset = current->offset + (start - current->start);
2259 size = (end <= current->end ? end : current->end) - start;
2260 if (current->eflags & MAP_ENTRY_IS_SUB_MAP) {
2261 vm_map_t smap;
2262 vm_map_entry_t tentry;
2263 vm_size_t tsize;
2264
2265 smap = current->object.sub_map;
2266 vm_map_lock_read(smap);
2267 (void) vm_map_lookup_entry(smap, offset, &tentry);
2268 tsize = tentry->end - offset;
2269 if (tsize < size)
2270 size = tsize;
2271 object = tentry->object.vm_object;
2272 offset = tentry->offset + (offset - tentry->start);
2273 vm_map_unlock_read(smap);
2274 } else {
2275 object = current->object.vm_object;
2276 }
2277 vm_object_sync(object, offset, size, syncio, invalidate);
2278 start += size;
2279 }
2280
2281 vm_map_unlock_read(map);
2282 return (KERN_SUCCESS);
2283 }
2284
2285 /*
2286 * vm_map_entry_unwire: [ internal use only ]
2287 *
2288 * Make the region specified by this entry pageable.
2289 *
2290 * The map in question should be locked.
2291 * [This is the reason for this routine's existence.]
2292 */
2293 static void
2294 vm_map_entry_unwire(vm_map_t map, vm_map_entry_t entry)
2295 {
2296 vm_fault_unwire(map, entry->start, entry->end,
2297 entry->object.vm_object != NULL &&
2298 (entry->object.vm_object->type == OBJT_DEVICE ||
2299 entry->object.vm_object->type == OBJT_SG));
2300 entry->wired_count = 0;
2301 }
2302
2303 /*
2304 * vm_map_entry_delete: [ internal use only ]
2305 *
2306 * Deallocate the given entry from the target map.
2307 */
2308 static void
2309 vm_map_entry_delete(vm_map_t map, vm_map_entry_t entry)
2310 {
2311 vm_object_t object;
2312 vm_pindex_t offidxstart, offidxend, count;
2313
2314 vm_map_entry_unlink(map, entry);
2315 map->size -= entry->end - entry->start;
2316
2317 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0 &&
2318 (object = entry->object.vm_object) != NULL) {
2319 count = OFF_TO_IDX(entry->end - entry->start);
2320 offidxstart = OFF_TO_IDX(entry->offset);
2321 offidxend = offidxstart + count;
2322 VM_OBJECT_LOCK(object);
2323 if (object->ref_count != 1 &&
2324 ((object->flags & (OBJ_NOSPLIT|OBJ_ONEMAPPING)) == OBJ_ONEMAPPING ||
2325 object == kernel_object || object == kmem_object)) {
2326 vm_object_collapse(object);
2327 vm_object_page_remove(object, offidxstart, offidxend, FALSE);
2328 if (object->type == OBJT_SWAP)
2329 swap_pager_freespace(object, offidxstart, count);
2330 if (offidxend >= object->size &&
2331 offidxstart < object->size)
2332 object->size = offidxstart;
2333 }
2334 VM_OBJECT_UNLOCK(object);
2335 vm_object_deallocate(object);
2336 }
2337
2338 vm_map_entry_dispose(map, entry);
2339 }
2340
2341 /*
2342 * vm_map_delete: [ internal use only ]
2343 *
2344 * Deallocates the given address range from the target
2345 * map.
2346 */
2347 int
2348 vm_map_delete(vm_map_t map, vm_offset_t start, vm_offset_t end)
2349 {
2350 vm_map_entry_t entry;
2351 vm_map_entry_t first_entry;
2352
2353 /*
2354 * Find the start of the region, and clip it
2355 */
2356 if (!vm_map_lookup_entry(map, start, &first_entry))
2357 entry = first_entry->next;
2358 else {
2359 entry = first_entry;
2360 vm_map_clip_start(map, entry, start);
2361 }
2362
2363 /*
2364 * Step through all entries in this region
2365 */
2366 while ((entry != &map->header) && (entry->start < end)) {
2367 vm_map_entry_t next;
2368
2369 /*
2370 * Wait for wiring or unwiring of an entry to complete.
2371 * Also wait for any system wirings to disappear on
2372 * user maps.
2373 */
2374 if ((entry->eflags & MAP_ENTRY_IN_TRANSITION) != 0 ||
2375 (vm_map_pmap(map) != kernel_pmap &&
2376 vm_map_entry_system_wired_count(entry) != 0)) {
2377 unsigned int last_timestamp;
2378 vm_offset_t saved_start;
2379 vm_map_entry_t tmp_entry;
2380
2381 saved_start = entry->start;
2382 entry->eflags |= MAP_ENTRY_NEEDS_WAKEUP;
2383 last_timestamp = map->timestamp;
2384 (void) vm_map_unlock_and_wait(map, FALSE);
2385 vm_map_lock(map);
2386 if (last_timestamp + 1 != map->timestamp) {
2387 /*
2388 * Look again for the entry because the map was
2389 * modified while it was unlocked.
2390 * Specifically, the entry may have been
2391 * clipped, merged, or deleted.
2392 */
2393 if (!vm_map_lookup_entry(map, saved_start,
2394 &tmp_entry))
2395 entry = tmp_entry->next;
2396 else {
2397 entry = tmp_entry;
2398 vm_map_clip_start(map, entry,
2399 saved_start);
2400 }
2401 }
2402 continue;
2403 }
2404 vm_map_clip_end(map, entry, end);
2405
2406 next = entry->next;
2407
2408 /*
2409 * Unwire before removing addresses from the pmap; otherwise,
2410 * unwiring will put the entries back in the pmap.
2411 */
2412 if (entry->wired_count != 0) {
2413 vm_map_entry_unwire(map, entry);
2414 }
2415
2416 pmap_remove(map->pmap, entry->start, entry->end);
2417
2418 /*
2419 * Delete the entry (which may delete the object) only after
2420 * removing all pmap entries pointing to its pages.
2421 * (Otherwise, its page frames may be reallocated, and any
2422 * modify bits will be set in the wrong object!)
2423 */
2424 vm_map_entry_delete(map, entry);
2425 entry = next;
2426 }
2427 return (KERN_SUCCESS);
2428 }
2429
2430 /*
2431 * vm_map_remove:
2432 *
2433 * Remove the given address range from the target map.
2434 * This is the exported form of vm_map_delete.
2435 */
2436 int
2437 vm_map_remove(vm_map_t map, vm_offset_t start, vm_offset_t end)
2438 {
2439 int result;
2440
2441 vm_map_lock(map);
2442 VM_MAP_RANGE_CHECK(map, start, end);
2443 result = vm_map_delete(map, start, end);
2444 vm_map_unlock(map);
2445 return (result);
2446 }
2447
2448 /*
2449 * vm_map_check_protection:
2450 *
2451 * Assert that the target map allows the specified privilege on the
2452 * entire address region given. The entire region must be allocated.
2453 *
2454 * WARNING! This code does not and should not check whether the
2455 * contents of the region is accessible. For example a smaller file
2456 * might be mapped into a larger address space.
2457 *
2458 * NOTE! This code is also called by munmap().
2459 *
2460 * The map must be locked. A read lock is sufficient.
2461 */
2462 boolean_t
2463 vm_map_check_protection(vm_map_t map, vm_offset_t start, vm_offset_t end,
2464 vm_prot_t protection)
2465 {
2466 vm_map_entry_t entry;
2467 vm_map_entry_t tmp_entry;
2468
2469 if (!vm_map_lookup_entry(map, start, &tmp_entry))
2470 return (FALSE);
2471 entry = tmp_entry;
2472
2473 while (start < end) {
2474 if (entry == &map->header)
2475 return (FALSE);
2476 /*
2477 * No holes allowed!
2478 */
2479 if (start < entry->start)
2480 return (FALSE);
2481 /*
2482 * Check protection associated with entry.
2483 */
2484 if ((entry->protection & protection) != protection)
2485 return (FALSE);
2486 /* go to next entry */
2487 start = entry->end;
2488 entry = entry->next;
2489 }
2490 return (TRUE);
2491 }
2492
2493 /*
2494 * vm_map_copy_entry:
2495 *
2496 * Copies the contents of the source entry to the destination
2497 * entry. The entries *must* be aligned properly.
2498 */
2499 static void
2500 vm_map_copy_entry(
2501 vm_map_t src_map,
2502 vm_map_t dst_map,
2503 vm_map_entry_t src_entry,
2504 vm_map_entry_t dst_entry)
2505 {
2506 vm_object_t src_object;
2507
2508 if ((dst_entry->eflags|src_entry->eflags) & MAP_ENTRY_IS_SUB_MAP)
2509 return;
2510
2511 if (src_entry->wired_count == 0) {
2512
2513 /*
2514 * If the source entry is marked needs_copy, it is already
2515 * write-protected.
2516 */
2517 if ((src_entry->eflags & MAP_ENTRY_NEEDS_COPY) == 0) {
2518 pmap_protect(src_map->pmap,
2519 src_entry->start,
2520 src_entry->end,
2521 src_entry->protection & ~VM_PROT_WRITE);
2522 }
2523
2524 /*
2525 * Make a copy of the object.
2526 */
2527 if ((src_object = src_entry->object.vm_object) != NULL) {
2528 VM_OBJECT_LOCK(src_object);
2529 if ((src_object->handle == NULL) &&
2530 (src_object->type == OBJT_DEFAULT ||
2531 src_object->type == OBJT_SWAP)) {
2532 vm_object_collapse(src_object);
2533 if ((src_object->flags & (OBJ_NOSPLIT|OBJ_ONEMAPPING)) == OBJ_ONEMAPPING) {
2534 vm_object_split(src_entry);
2535 src_object = src_entry->object.vm_object;
2536 }
2537 }
2538 vm_object_reference_locked(src_object);
2539 vm_object_clear_flag(src_object, OBJ_ONEMAPPING);
2540 VM_OBJECT_UNLOCK(src_object);
2541 dst_entry->object.vm_object = src_object;
2542 src_entry->eflags |= (MAP_ENTRY_COW|MAP_ENTRY_NEEDS_COPY);
2543 dst_entry->eflags |= (MAP_ENTRY_COW|MAP_ENTRY_NEEDS_COPY);
2544 dst_entry->offset = src_entry->offset;
2545 } else {
2546 dst_entry->object.vm_object = NULL;
2547 dst_entry->offset = 0;
2548 }
2549
2550 pmap_copy(dst_map->pmap, src_map->pmap, dst_entry->start,
2551 dst_entry->end - dst_entry->start, src_entry->start);
2552 } else {
2553 /*
2554 * Of course, wired down pages can't be set copy-on-write.
2555 * Cause wired pages to be copied into the new map by
2556 * simulating faults (the new pages are pageable)
2557 */
2558 vm_fault_copy_entry(dst_map, src_map, dst_entry, src_entry);
2559 }
2560 }
2561
2562 /*
2563 * vmspace_map_entry_forked:
2564 * Update the newly-forked vmspace each time a map entry is inherited
2565 * or copied. The values for vm_dsize and vm_tsize are approximate
2566 * (and mostly-obsolete ideas in the face of mmap(2) et al.)
2567 */
2568 static void
2569 vmspace_map_entry_forked(const struct vmspace *vm1, struct vmspace *vm2,
2570 vm_map_entry_t entry)
2571 {
2572 vm_size_t entrysize;
2573 vm_offset_t newend;
2574
2575 entrysize = entry->end - entry->start;
2576 vm2->vm_map.size += entrysize;
2577 if (entry->eflags & (MAP_ENTRY_GROWS_DOWN | MAP_ENTRY_GROWS_UP)) {
2578 vm2->vm_ssize += btoc(entrysize);
2579 } else if (entry->start >= (vm_offset_t)vm1->vm_daddr &&
2580 entry->start < (vm_offset_t)vm1->vm_daddr + ctob(vm1->vm_dsize)) {
2581 newend = MIN(entry->end,
2582 (vm_offset_t)vm1->vm_daddr + ctob(vm1->vm_dsize));
2583 vm2->vm_dsize += btoc(newend - entry->start);
2584 } else if (entry->start >= (vm_offset_t)vm1->vm_taddr &&
2585 entry->start < (vm_offset_t)vm1->vm_taddr + ctob(vm1->vm_tsize)) {
2586 newend = MIN(entry->end,
2587 (vm_offset_t)vm1->vm_taddr + ctob(vm1->vm_tsize));
2588 vm2->vm_tsize += btoc(newend - entry->start);
2589 }
2590 }
2591
2592 /*
2593 * vmspace_fork:
2594 * Create a new process vmspace structure and vm_map
2595 * based on those of an existing process. The new map
2596 * is based on the old map, according to the inheritance
2597 * values on the regions in that map.
2598 *
2599 * XXX It might be worth coalescing the entries added to the new vmspace.
2600 *
2601 * The source map must not be locked.
2602 */
2603 struct vmspace *
2604 vmspace_fork(struct vmspace *vm1)
2605 {
2606 struct vmspace *vm2;
2607 vm_map_t old_map = &vm1->vm_map;
2608 vm_map_t new_map;
2609 vm_map_entry_t old_entry;
2610 vm_map_entry_t new_entry;
2611 vm_object_t object;
2612
2613 vm_map_lock(old_map);
2614
2615 vm2 = vmspace_alloc(old_map->min_offset, old_map->max_offset);
2616 if (vm2 == NULL)
2617 goto unlock_and_return;
2618 vm2->vm_taddr = vm1->vm_taddr;
2619 vm2->vm_daddr = vm1->vm_daddr;
2620 vm2->vm_maxsaddr = vm1->vm_maxsaddr;
2621 new_map = &vm2->vm_map; /* XXX */
2622 new_map->timestamp = 1;
2623
2624 old_entry = old_map->header.next;
2625
2626 while (old_entry != &old_map->header) {
2627 if (old_entry->eflags & MAP_ENTRY_IS_SUB_MAP)
2628 panic("vm_map_fork: encountered a submap");
2629
2630 switch (old_entry->inheritance) {
2631 case VM_INHERIT_NONE:
2632 break;
2633
2634 case VM_INHERIT_SHARE:
2635 /*
2636 * Clone the entry, creating the shared object if necessary.
2637 */
2638 object = old_entry->object.vm_object;
2639 if (object == NULL) {
2640 object = vm_object_allocate(OBJT_DEFAULT,
2641 atop(old_entry->end - old_entry->start));
2642 old_entry->object.vm_object = object;
2643 old_entry->offset = 0;
2644 }
2645
2646 /*
2647 * Add the reference before calling vm_object_shadow
2648 * to insure that a shadow object is created.
2649 */
2650 vm_object_reference(object);
2651 if (old_entry->eflags & MAP_ENTRY_NEEDS_COPY) {
2652 vm_object_shadow(&old_entry->object.vm_object,
2653 &old_entry->offset,
2654 atop(old_entry->end - old_entry->start));
2655 old_entry->eflags &= ~MAP_ENTRY_NEEDS_COPY;
2656 /* Transfer the second reference too. */
2657 vm_object_reference(
2658 old_entry->object.vm_object);
2659 vm_object_deallocate(object);
2660 object = old_entry->object.vm_object;
2661 }
2662 VM_OBJECT_LOCK(object);
2663 vm_object_clear_flag(object, OBJ_ONEMAPPING);
2664 VM_OBJECT_UNLOCK(object);
2665
2666 /*
2667 * Clone the entry, referencing the shared object.
2668 */
2669 new_entry = vm_map_entry_create(new_map);
2670 *new_entry = *old_entry;
2671 new_entry->eflags &= ~(MAP_ENTRY_USER_WIRED |
2672 MAP_ENTRY_IN_TRANSITION);
2673 new_entry->wired_count = 0;
2674
2675 /*
2676 * Insert the entry into the new map -- we know we're
2677 * inserting at the end of the new map.
2678 */
2679 vm_map_entry_link(new_map, new_map->header.prev,
2680 new_entry);
2681 vmspace_map_entry_forked(vm1, vm2, new_entry);
2682
2683 /*
2684 * Update the physical map
2685 */
2686 pmap_copy(new_map->pmap, old_map->pmap,
2687 new_entry->start,
2688 (old_entry->end - old_entry->start),
2689 old_entry->start);
2690 break;
2691
2692 case VM_INHERIT_COPY:
2693 /*
2694 * Clone the entry and link into the map.
2695 */
2696 new_entry = vm_map_entry_create(new_map);
2697 *new_entry = *old_entry;
2698 new_entry->eflags &= ~(MAP_ENTRY_USER_WIRED |
2699 MAP_ENTRY_IN_TRANSITION);
2700 new_entry->wired_count = 0;
2701 new_entry->object.vm_object = NULL;
2702 vm_map_entry_link(new_map, new_map->header.prev,
2703 new_entry);
2704 vmspace_map_entry_forked(vm1, vm2, new_entry);
2705 vm_map_copy_entry(old_map, new_map, old_entry,
2706 new_entry);
2707 break;
2708 }
2709 old_entry = old_entry->next;
2710 }
2711 unlock_and_return:
2712 vm_map_unlock(old_map);
2713
2714 return (vm2);
2715 }
2716
2717 int
2718 vm_map_stack(vm_map_t map, vm_offset_t addrbos, vm_size_t max_ssize,
2719 vm_prot_t prot, vm_prot_t max, int cow)
2720 {
2721 vm_map_entry_t new_entry, prev_entry;
2722 vm_offset_t bot, top;
2723 vm_size_t init_ssize;
2724 int orient, rv;
2725 rlim_t vmemlim;
2726
2727 /*
2728 * The stack orientation is piggybacked with the cow argument.
2729 * Extract it into orient and mask the cow argument so that we
2730 * don't pass it around further.
2731 * NOTE: We explicitly allow bi-directional stacks.
2732 */
2733 orient = cow & (MAP_STACK_GROWS_DOWN|MAP_STACK_GROWS_UP);
2734 cow &= ~orient;
2735 KASSERT(orient != 0, ("No stack grow direction"));
2736
2737 if (addrbos < vm_map_min(map) ||
2738 addrbos > vm_map_max(map) ||
2739 addrbos + max_ssize < addrbos)
2740 return (KERN_NO_SPACE);
2741
2742 init_ssize = (max_ssize < sgrowsiz) ? max_ssize : sgrowsiz;
2743
2744 PROC_LOCK(curthread->td_proc);
2745 vmemlim = lim_cur(curthread->td_proc, RLIMIT_VMEM);
2746 PROC_UNLOCK(curthread->td_proc);
2747
2748 vm_map_lock(map);
2749
2750 /* If addr is already mapped, no go */
2751 if (vm_map_lookup_entry(map, addrbos, &prev_entry)) {
2752 vm_map_unlock(map);
2753 return (KERN_NO_SPACE);
2754 }
2755
2756 /* If we would blow our VMEM resource limit, no go */
2757 if (map->size + init_ssize > vmemlim) {
2758 vm_map_unlock(map);
2759 return (KERN_NO_SPACE);
2760 }
2761
2762 /*
2763 * If we can't accomodate max_ssize in the current mapping, no go.
2764 * However, we need to be aware that subsequent user mappings might
2765 * map into the space we have reserved for stack, and currently this
2766 * space is not protected.
2767 *
2768 * Hopefully we will at least detect this condition when we try to
2769 * grow the stack.
2770 */
2771 if ((prev_entry->next != &map->header) &&
2772 (prev_entry->next->start < addrbos + max_ssize)) {
2773 vm_map_unlock(map);
2774 return (KERN_NO_SPACE);
2775 }
2776
2777 /*
2778 * We initially map a stack of only init_ssize. We will grow as
2779 * needed later. Depending on the orientation of the stack (i.e.
2780 * the grow direction) we either map at the top of the range, the
2781 * bottom of the range or in the middle.
2782 *
2783 * Note: we would normally expect prot and max to be VM_PROT_ALL,
2784 * and cow to be 0. Possibly we should eliminate these as input
2785 * parameters, and just pass these values here in the insert call.
2786 */
2787 if (orient == MAP_STACK_GROWS_DOWN)
2788 bot = addrbos + max_ssize - init_ssize;
2789 else if (orient == MAP_STACK_GROWS_UP)
2790 bot = addrbos;
2791 else
2792 bot = round_page(addrbos + max_ssize/2 - init_ssize/2);
2793 top = bot + init_ssize;
2794 rv = vm_map_insert(map, NULL, 0, bot, top, prot, max, cow);
2795
2796 /* Now set the avail_ssize amount. */
2797 if (rv == KERN_SUCCESS) {
2798 if (prev_entry != &map->header)
2799 vm_map_clip_end(map, prev_entry, bot);
2800 new_entry = prev_entry->next;
2801 if (new_entry->end != top || new_entry->start != bot)
2802 panic("Bad entry start/end for new stack entry");
2803
2804 new_entry->avail_ssize = max_ssize - init_ssize;
2805 if (orient & MAP_STACK_GROWS_DOWN)
2806 new_entry->eflags |= MAP_ENTRY_GROWS_DOWN;
2807 if (orient & MAP_STACK_GROWS_UP)
2808 new_entry->eflags |= MAP_ENTRY_GROWS_UP;
2809 }
2810
2811 vm_map_unlock(map);
2812 return (rv);
2813 }
2814
2815 /* Attempts to grow a vm stack entry. Returns KERN_SUCCESS if the
2816 * desired address is already mapped, or if we successfully grow
2817 * the stack. Also returns KERN_SUCCESS if addr is outside the
2818 * stack range (this is strange, but preserves compatibility with
2819 * the grow function in vm_machdep.c).
2820 */
2821 int
2822 vm_map_growstack(struct proc *p, vm_offset_t addr)
2823 {
2824 vm_map_entry_t next_entry, prev_entry;
2825 vm_map_entry_t new_entry, stack_entry;
2826 struct vmspace *vm = p->p_vmspace;
2827 vm_map_t map = &vm->vm_map;
2828 vm_offset_t end;
2829 size_t grow_amount, max_grow;
2830 rlim_t stacklim, vmemlim;
2831 int is_procstack, rv;
2832
2833 Retry:
2834 PROC_LOCK(p);
2835 stacklim = lim_cur(p, RLIMIT_STACK);
2836 vmemlim = lim_cur(p, RLIMIT_VMEM);
2837 PROC_UNLOCK(p);
2838
2839 vm_map_lock_read(map);
2840
2841 /* If addr is already in the entry range, no need to grow.*/
2842 if (vm_map_lookup_entry(map, addr, &prev_entry)) {
2843 vm_map_unlock_read(map);
2844 return (KERN_SUCCESS);
2845 }
2846
2847 next_entry = prev_entry->next;
2848 if (!(prev_entry->eflags & MAP_ENTRY_GROWS_UP)) {
2849 /*
2850 * This entry does not grow upwards. Since the address lies
2851 * beyond this entry, the next entry (if one exists) has to
2852 * be a downward growable entry. The entry list header is
2853 * never a growable entry, so it suffices to check the flags.
2854 */
2855 if (!(next_entry->eflags & MAP_ENTRY_GROWS_DOWN)) {
2856 vm_map_unlock_read(map);
2857 return (KERN_SUCCESS);
2858 }
2859 stack_entry = next_entry;
2860 } else {
2861 /*
2862 * This entry grows upward. If the next entry does not at
2863 * least grow downwards, this is the entry we need to grow.
2864 * otherwise we have two possible choices and we have to
2865 * select one.
2866 */
2867 if (next_entry->eflags & MAP_ENTRY_GROWS_DOWN) {
2868 /*
2869 * We have two choices; grow the entry closest to
2870 * the address to minimize the amount of growth.
2871 */
2872 if (addr - prev_entry->end <= next_entry->start - addr)
2873 stack_entry = prev_entry;
2874 else
2875 stack_entry = next_entry;
2876 } else
2877 stack_entry = prev_entry;
2878 }
2879
2880 if (stack_entry == next_entry) {
2881 KASSERT(stack_entry->eflags & MAP_ENTRY_GROWS_DOWN, ("foo"));
2882 KASSERT(addr < stack_entry->start, ("foo"));
2883 end = (prev_entry != &map->header) ? prev_entry->end :
2884 stack_entry->start - stack_entry->avail_ssize;
2885 grow_amount = roundup(stack_entry->start - addr, PAGE_SIZE);
2886 max_grow = stack_entry->start - end;
2887 } else {
2888 KASSERT(stack_entry->eflags & MAP_ENTRY_GROWS_UP, ("foo"));
2889 KASSERT(addr >= stack_entry->end, ("foo"));
2890 end = (next_entry != &map->header) ? next_entry->start :
2891 stack_entry->end + stack_entry->avail_ssize;
2892 grow_amount = roundup(addr + 1 - stack_entry->end, PAGE_SIZE);
2893 max_grow = end - stack_entry->end;
2894 }
2895
2896 if (grow_amount > stack_entry->avail_ssize) {
2897 vm_map_unlock_read(map);
2898 return (KERN_NO_SPACE);
2899 }
2900
2901 /*
2902 * If there is no longer enough space between the entries nogo, and
2903 * adjust the available space. Note: this should only happen if the
2904 * user has mapped into the stack area after the stack was created,
2905 * and is probably an error.
2906 *
2907 * This also effectively destroys any guard page the user might have
2908 * intended by limiting the stack size.
2909 */
2910 if (grow_amount > max_grow) {
2911 if (vm_map_lock_upgrade(map))
2912 goto Retry;
2913
2914 stack_entry->avail_ssize = max_grow;
2915
2916 vm_map_unlock(map);
2917 return (KERN_NO_SPACE);
2918 }
2919
2920 is_procstack = (addr >= (vm_offset_t)vm->vm_maxsaddr) ? 1 : 0;
2921
2922 /*
2923 * If this is the main process stack, see if we're over the stack
2924 * limit.
2925 */
2926 if (is_procstack && (ctob(vm->vm_ssize) + grow_amount > stacklim)) {
2927 vm_map_unlock_read(map);
2928 return (KERN_NO_SPACE);
2929 }
2930
2931 /* Round up the grow amount modulo SGROWSIZ */
2932 grow_amount = roundup (grow_amount, sgrowsiz);
2933 if (grow_amount > stack_entry->avail_ssize)
2934 grow_amount = stack_entry->avail_ssize;
2935 if (is_procstack && (ctob(vm->vm_ssize) + grow_amount > stacklim)) {
2936 grow_amount = stacklim - ctob(vm->vm_ssize);
2937 }
2938
2939 /* If we would blow our VMEM resource limit, no go */
2940 if (map->size + grow_amount > vmemlim) {
2941 vm_map_unlock_read(map);
2942 return (KERN_NO_SPACE);
2943 }
2944
2945 if (vm_map_lock_upgrade(map))
2946 goto Retry;
2947
2948 if (stack_entry == next_entry) {
2949 /*
2950 * Growing downward.
2951 */
2952 /* Get the preliminary new entry start value */
2953 addr = stack_entry->start - grow_amount;
2954
2955 /*
2956 * If this puts us into the previous entry, cut back our
2957 * growth to the available space. Also, see the note above.
2958 */
2959 if (addr < end) {
2960 stack_entry->avail_ssize = max_grow;
2961 addr = end;
2962 }
2963
2964 rv = vm_map_insert(map, NULL, 0, addr, stack_entry->start,
2965 p->p_sysent->sv_stackprot, VM_PROT_ALL, 0);
2966
2967 /* Adjust the available stack space by the amount we grew. */
2968 if (rv == KERN_SUCCESS) {
2969 if (prev_entry != &map->header)
2970 vm_map_clip_end(map, prev_entry, addr);
2971 new_entry = prev_entry->next;
2972 KASSERT(new_entry == stack_entry->prev, ("foo"));
2973 KASSERT(new_entry->end == stack_entry->start, ("foo"));
2974 KASSERT(new_entry->start == addr, ("foo"));
2975 grow_amount = new_entry->end - new_entry->start;
2976 new_entry->avail_ssize = stack_entry->avail_ssize -
2977 grow_amount;
2978 stack_entry->eflags &= ~MAP_ENTRY_GROWS_DOWN;
2979 new_entry->eflags |= MAP_ENTRY_GROWS_DOWN;
2980 }
2981 } else {
2982 /*
2983 * Growing upward.
2984 */
2985 addr = stack_entry->end + grow_amount;
2986
2987 /*
2988 * If this puts us into the next entry, cut back our growth
2989 * to the available space. Also, see the note above.
2990 */
2991 if (addr > end) {
2992 stack_entry->avail_ssize = end - stack_entry->end;
2993 addr = end;
2994 }
2995
2996 grow_amount = addr - stack_entry->end;
2997
2998 /* Grow the underlying object if applicable. */
2999 if (stack_entry->object.vm_object == NULL ||
3000 vm_object_coalesce(stack_entry->object.vm_object,
3001 stack_entry->offset,
3002 (vm_size_t)(stack_entry->end - stack_entry->start),
3003 (vm_size_t)grow_amount)) {
3004 map->size += (addr - stack_entry->end);
3005 /* Update the current entry. */
3006 stack_entry->end = addr;
3007 stack_entry->avail_ssize -= grow_amount;
3008 vm_map_entry_resize_free(map, stack_entry);
3009 rv = KERN_SUCCESS;
3010
3011 if (next_entry != &map->header)
3012 vm_map_clip_start(map, next_entry, addr);
3013 } else
3014 rv = KERN_FAILURE;
3015 }
3016
3017 if (rv == KERN_SUCCESS && is_procstack)
3018 vm->vm_ssize += btoc(grow_amount);
3019
3020 vm_map_unlock(map);
3021
3022 /*
3023 * Heed the MAP_WIREFUTURE flag if it was set for this process.
3024 */
3025 if (rv == KERN_SUCCESS && (map->flags & MAP_WIREFUTURE)) {
3026 vm_map_wire(map,
3027 (stack_entry == next_entry) ? addr : addr - grow_amount,
3028 (stack_entry == next_entry) ? stack_entry->start : addr,
3029 (p->p_flag & P_SYSTEM)
3030 ? VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES
3031 : VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES);
3032 }
3033
3034 return (rv);
3035 }
3036
3037 /*
3038 * Unshare the specified VM space for exec. If other processes are
3039 * mapped to it, then create a new one. The new vmspace is null.
3040 */
3041 int
3042 vmspace_exec(struct proc *p, vm_offset_t minuser, vm_offset_t maxuser)
3043 {
3044 struct vmspace *oldvmspace = p->p_vmspace;
3045 struct vmspace *newvmspace;
3046
3047 newvmspace = vmspace_alloc(minuser, maxuser);
3048 if (newvmspace == NULL)
3049 return (ENOMEM);
3050 newvmspace->vm_swrss = oldvmspace->vm_swrss;
3051 /*
3052 * This code is written like this for prototype purposes. The
3053 * goal is to avoid running down the vmspace here, but let the
3054 * other process's that are still using the vmspace to finally
3055 * run it down. Even though there is little or no chance of blocking
3056 * here, it is a good idea to keep this form for future mods.
3057 */
3058 PROC_VMSPACE_LOCK(p);
3059 p->p_vmspace = newvmspace;
3060 PROC_VMSPACE_UNLOCK(p);
3061 if (p == curthread->td_proc) /* XXXKSE ? */
3062 pmap_activate(curthread);
3063 vmspace_free(oldvmspace);
3064 return (0);
3065 }
3066
3067 /*
3068 * Unshare the specified VM space for forcing COW. This
3069 * is called by rfork, for the (RFMEM|RFPROC) == 0 case.
3070 */
3071 int
3072 vmspace_unshare(struct proc *p)
3073 {
3074 struct vmspace *oldvmspace = p->p_vmspace;
3075 struct vmspace *newvmspace;
3076
3077 if (oldvmspace->vm_refcnt == 1)
3078 return (0);
3079 newvmspace = vmspace_fork(oldvmspace);
3080 if (newvmspace == NULL)
3081 return (ENOMEM);
3082 PROC_VMSPACE_LOCK(p);
3083 p->p_vmspace = newvmspace;
3084 PROC_VMSPACE_UNLOCK(p);
3085 if (p == curthread->td_proc) /* XXXKSE ? */
3086 pmap_activate(curthread);
3087 vmspace_free(oldvmspace);
3088 return (0);
3089 }
3090
3091 /*
3092 * vm_map_lookup:
3093 *
3094 * Finds the VM object, offset, and
3095 * protection for a given virtual address in the
3096 * specified map, assuming a page fault of the
3097 * type specified.
3098 *
3099 * Leaves the map in question locked for read; return
3100 * values are guaranteed until a vm_map_lookup_done
3101 * call is performed. Note that the map argument
3102 * is in/out; the returned map must be used in
3103 * the call to vm_map_lookup_done.
3104 *
3105 * A handle (out_entry) is returned for use in
3106 * vm_map_lookup_done, to make that fast.
3107 *
3108 * If a lookup is requested with "write protection"
3109 * specified, the map may be changed to perform virtual
3110 * copying operations, although the data referenced will
3111 * remain the same.
3112 */
3113 int
3114 vm_map_lookup(vm_map_t *var_map, /* IN/OUT */
3115 vm_offset_t vaddr,
3116 vm_prot_t fault_typea,
3117 vm_map_entry_t *out_entry, /* OUT */
3118 vm_object_t *object, /* OUT */
3119 vm_pindex_t *pindex, /* OUT */
3120 vm_prot_t *out_prot, /* OUT */
3121 boolean_t *wired) /* OUT */
3122 {
3123 vm_map_entry_t entry;
3124 vm_map_t map = *var_map;
3125 vm_prot_t prot;
3126 vm_prot_t fault_type = fault_typea;
3127
3128 RetryLookup:;
3129 /*
3130 * Lookup the faulting address.
3131 */
3132
3133 vm_map_lock_read(map);
3134 #define RETURN(why) \
3135 { \
3136 vm_map_unlock_read(map); \
3137 return (why); \
3138 }
3139
3140 /*
3141 * If the map has an interesting hint, try it before calling full
3142 * blown lookup routine.
3143 */
3144 entry = map->root;
3145 *out_entry = entry;
3146 if (entry == NULL ||
3147 (vaddr < entry->start) || (vaddr >= entry->end)) {
3148 /*
3149 * Entry was either not a valid hint, or the vaddr was not
3150 * contained in the entry, so do a full lookup.
3151 */
3152 if (!vm_map_lookup_entry(map, vaddr, out_entry))
3153 RETURN(KERN_INVALID_ADDRESS);
3154
3155 entry = *out_entry;
3156 }
3157
3158 /*
3159 * Handle submaps.
3160 */
3161 if (entry->eflags & MAP_ENTRY_IS_SUB_MAP) {
3162 vm_map_t old_map = map;
3163
3164 *var_map = map = entry->object.sub_map;
3165 vm_map_unlock_read(old_map);
3166 goto RetryLookup;
3167 }
3168
3169 /*
3170 * Check whether this task is allowed to have this page.
3171 * Note the special case for MAP_ENTRY_COW
3172 * pages with an override. This is to implement a forced
3173 * COW for debuggers.
3174 */
3175 if (fault_type & VM_PROT_OVERRIDE_WRITE)
3176 prot = entry->max_protection;
3177 else
3178 prot = entry->protection;
3179 fault_type &= (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
3180 if ((fault_type & prot) != fault_type) {
3181 RETURN(KERN_PROTECTION_FAILURE);
3182 }
3183 if ((entry->eflags & MAP_ENTRY_USER_WIRED) &&
3184 (entry->eflags & MAP_ENTRY_COW) &&
3185 (fault_type & VM_PROT_WRITE) &&
3186 (fault_typea & VM_PROT_OVERRIDE_WRITE) == 0) {
3187 RETURN(KERN_PROTECTION_FAILURE);
3188 }
3189
3190 /*
3191 * If this page is not pageable, we have to get it for all possible
3192 * accesses.
3193 */
3194 *wired = (entry->wired_count != 0);
3195 if (*wired)
3196 prot = fault_type = entry->protection;
3197
3198 /*
3199 * If the entry was copy-on-write, we either ...
3200 */
3201 if (entry->eflags & MAP_ENTRY_NEEDS_COPY) {
3202 /*
3203 * If we want to write the page, we may as well handle that
3204 * now since we've got the map locked.
3205 *
3206 * If we don't need to write the page, we just demote the
3207 * permissions allowed.
3208 */
3209 if (fault_type & VM_PROT_WRITE) {
3210 /*
3211 * Make a new object, and place it in the object
3212 * chain. Note that no new references have appeared
3213 * -- one just moved from the map to the new
3214 * object.
3215 */
3216 if (vm_map_lock_upgrade(map))
3217 goto RetryLookup;
3218
3219 vm_object_shadow(
3220 &entry->object.vm_object,
3221 &entry->offset,
3222 atop(entry->end - entry->start));
3223 entry->eflags &= ~MAP_ENTRY_NEEDS_COPY;
3224
3225 vm_map_lock_downgrade(map);
3226 } else {
3227 /*
3228 * We're attempting to read a copy-on-write page --
3229 * don't allow writes.
3230 */
3231 prot &= ~VM_PROT_WRITE;
3232 }
3233 }
3234
3235 /*
3236 * Create an object if necessary.
3237 */
3238 if (entry->object.vm_object == NULL &&
3239 !map->system_map) {
3240 if (vm_map_lock_upgrade(map))
3241 goto RetryLookup;
3242 entry->object.vm_object = vm_object_allocate(OBJT_DEFAULT,
3243 atop(entry->end - entry->start));
3244 entry->offset = 0;
3245 vm_map_lock_downgrade(map);
3246 }
3247
3248 /*
3249 * Return the object/offset from this entry. If the entry was
3250 * copy-on-write or empty, it has been fixed up.
3251 */
3252 *pindex = OFF_TO_IDX((vaddr - entry->start) + entry->offset);
3253 *object = entry->object.vm_object;
3254
3255 *out_prot = prot;
3256 return (KERN_SUCCESS);
3257
3258 #undef RETURN
3259 }
3260
3261 /*
3262 * vm_map_lookup_locked:
3263 *
3264 * Lookup the faulting address. A version of vm_map_lookup that returns
3265 * KERN_FAILURE instead of blocking on map lock or memory allocation.
3266 */
3267 int
3268 vm_map_lookup_locked(vm_map_t *var_map, /* IN/OUT */
3269 vm_offset_t vaddr,
3270 vm_prot_t fault_typea,
3271 vm_map_entry_t *out_entry, /* OUT */
3272 vm_object_t *object, /* OUT */
3273 vm_pindex_t *pindex, /* OUT */
3274 vm_prot_t *out_prot, /* OUT */
3275 boolean_t *wired) /* OUT */
3276 {
3277 vm_map_entry_t entry;
3278 vm_map_t map = *var_map;
3279 vm_prot_t prot;
3280 vm_prot_t fault_type = fault_typea;
3281
3282 /*
3283 * If the map has an interesting hint, try it before calling full
3284 * blown lookup routine.
3285 */
3286 entry = map->root;
3287 *out_entry = entry;
3288 if (entry == NULL ||
3289 (vaddr < entry->start) || (vaddr >= entry->end)) {
3290 /*
3291 * Entry was either not a valid hint, or the vaddr was not
3292 * contained in the entry, so do a full lookup.
3293 */
3294 if (!vm_map_lookup_entry(map, vaddr, out_entry))
3295 return (KERN_INVALID_ADDRESS);
3296
3297 entry = *out_entry;
3298 }
3299
3300 /*
3301 * Fail if the entry refers to a submap.
3302 */
3303 if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
3304 return (KERN_FAILURE);
3305
3306 /*
3307 * Check whether this task is allowed to have this page.
3308 * Note the special case for MAP_ENTRY_COW
3309 * pages with an override. This is to implement a forced
3310 * COW for debuggers.
3311 */
3312 if (fault_type & VM_PROT_OVERRIDE_WRITE)
3313 prot = entry->max_protection;
3314 else
3315 prot = entry->protection;
3316 fault_type &= VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE;
3317 if ((fault_type & prot) != fault_type)
3318 return (KERN_PROTECTION_FAILURE);
3319 if ((entry->eflags & MAP_ENTRY_USER_WIRED) &&
3320 (entry->eflags & MAP_ENTRY_COW) &&
3321 (fault_type & VM_PROT_WRITE) &&
3322 (fault_typea & VM_PROT_OVERRIDE_WRITE) == 0)
3323 return (KERN_PROTECTION_FAILURE);
3324
3325 /*
3326 * If this page is not pageable, we have to get it for all possible
3327 * accesses.
3328 */
3329 *wired = (entry->wired_count != 0);
3330 if (*wired)
3331 prot = fault_type = entry->protection;
3332
3333 if (entry->eflags & MAP_ENTRY_NEEDS_COPY) {
3334 /*
3335 * Fail if the entry was copy-on-write for a write fault.
3336 */
3337 if (fault_type & VM_PROT_WRITE)
3338 return (KERN_FAILURE);
3339 /*
3340 * We're attempting to read a copy-on-write page --
3341 * don't allow writes.
3342 */
3343 prot &= ~VM_PROT_WRITE;
3344 }
3345
3346 /*
3347 * Fail if an object should be created.
3348 */
3349 if (entry->object.vm_object == NULL && !map->system_map)
3350 return (KERN_FAILURE);
3351
3352 /*
3353 * Return the object/offset from this entry. If the entry was
3354 * copy-on-write or empty, it has been fixed up.
3355 */
3356 *pindex = OFF_TO_IDX((vaddr - entry->start) + entry->offset);
3357 *object = entry->object.vm_object;
3358
3359 *out_prot = prot;
3360 return (KERN_SUCCESS);
3361 }
3362
3363 /*
3364 * vm_map_lookup_done:
3365 *
3366 * Releases locks acquired by a vm_map_lookup
3367 * (according to the handle returned by that lookup).
3368 */
3369 void
3370 vm_map_lookup_done(vm_map_t map, vm_map_entry_t entry)
3371 {
3372 /*
3373 * Unlock the main-level map
3374 */
3375 vm_map_unlock_read(map);
3376 }
3377
3378 #include "opt_ddb.h"
3379 #ifdef DDB
3380 #include <sys/kernel.h>
3381
3382 #include <ddb/ddb.h>
3383
3384 /*
3385 * vm_map_print: [ debug ]
3386 */
3387 DB_SHOW_COMMAND(map, vm_map_print)
3388 {
3389 static int nlines;
3390 /* XXX convert args. */
3391 vm_map_t map = (vm_map_t)addr;
3392 boolean_t full = have_addr;
3393
3394 vm_map_entry_t entry;
3395
3396 db_iprintf("Task map %p: pmap=%p, nentries=%d, version=%u\n",
3397 (void *)map,
3398 (void *)map->pmap, map->nentries, map->timestamp);
3399 nlines++;
3400
3401 if (!full && db_indent)
3402 return;
3403
3404 db_indent += 2;
3405 for (entry = map->header.next; entry != &map->header;
3406 entry = entry->next) {
3407 db_iprintf("map entry %p: start=%p, end=%p\n",
3408 (void *)entry, (void *)entry->start, (void *)entry->end);
3409 nlines++;
3410 {
3411 static char *inheritance_name[4] =
3412 {"share", "copy", "none", "donate_copy"};
3413
3414 db_iprintf(" prot=%x/%x/%s",
3415 entry->protection,
3416 entry->max_protection,
3417 inheritance_name[(int)(unsigned char)entry->inheritance]);
3418 if (entry->wired_count != 0)
3419 db_printf(", wired");
3420 }
3421 if (entry->eflags & MAP_ENTRY_IS_SUB_MAP) {
3422 db_printf(", share=%p, offset=0x%jx\n",
3423 (void *)entry->object.sub_map,
3424 (uintmax_t)entry->offset);
3425 nlines++;
3426 if ((entry->prev == &map->header) ||
3427 (entry->prev->object.sub_map !=
3428 entry->object.sub_map)) {
3429 db_indent += 2;
3430 vm_map_print((db_expr_t)(intptr_t)
3431 entry->object.sub_map,
3432 full, 0, (char *)0);
3433 db_indent -= 2;
3434 }
3435 } else {
3436 db_printf(", object=%p, offset=0x%jx",
3437 (void *)entry->object.vm_object,
3438 (uintmax_t)entry->offset);
3439 if (entry->eflags & MAP_ENTRY_COW)
3440 db_printf(", copy (%s)",
3441 (entry->eflags & MAP_ENTRY_NEEDS_COPY) ? "needed" : "done");
3442 db_printf("\n");
3443 nlines++;
3444
3445 if ((entry->prev == &map->header) ||
3446 (entry->prev->object.vm_object !=
3447 entry->object.vm_object)) {
3448 db_indent += 2;
3449 vm_object_print((db_expr_t)(intptr_t)
3450 entry->object.vm_object,
3451 full, 0, (char *)0);
3452 nlines += 4;
3453 db_indent -= 2;
3454 }
3455 }
3456 }
3457 db_indent -= 2;
3458 if (db_indent == 0)
3459 nlines = 0;
3460 }
3461
3462
3463 DB_SHOW_COMMAND(procvm, procvm)
3464 {
3465 struct proc *p;
3466
3467 if (have_addr) {
3468 p = (struct proc *) addr;
3469 } else {
3470 p = curproc;
3471 }
3472
3473 db_printf("p = %p, vmspace = %p, map = %p, pmap = %p\n",
3474 (void *)p, (void *)p->p_vmspace, (void *)&p->p_vmspace->vm_map,
3475 (void *)vmspace_pmap(p->p_vmspace));
3476
3477 vm_map_print((db_expr_t)(intptr_t)&p->p_vmspace->vm_map, 1, 0, NULL);
3478 }
3479
3480 #endif /* DDB */
Cache object: f008dbb77562a487bda7ab4c52ef9684
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