xref: /freebsd/sys/vm/vm_map.h (revision 74bf4e164ba5851606a27d4feff27717452583e5)
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  *	@(#)vm_map.h	8.9 (Berkeley) 5/17/95
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  * $FreeBSD$
61  */
62 
63 /*
64  *	Virtual memory map module definitions.
65  */
66 #ifndef	_VM_MAP_
67 #define	_VM_MAP_
68 
69 #include <sys/lock.h>
70 #include <sys/sx.h>
71 #include <sys/_mutex.h>
72 
73 /*
74  *	Types defined:
75  *
76  *	vm_map_t		the high-level address map data structure.
77  *	vm_map_entry_t		an entry in an address map.
78  */
79 
80 typedef u_char vm_flags_t;
81 typedef u_int vm_eflags_t;
82 
83 /*
84  *	Objects which live in maps may be either VM objects, or
85  *	another map (called a "sharing map") which denotes read-write
86  *	sharing with other maps.
87  */
88 union vm_map_object {
89 	struct vm_object *vm_object;	/* object object */
90 	struct vm_map *sub_map;		/* belongs to another map */
91 };
92 
93 /*
94  *	Address map entries consist of start and end addresses,
95  *	a VM object (or sharing map) and offset into that object,
96  *	and user-exported inheritance and protection information.
97  *	Also included is control information for virtual copy operations.
98  */
99 struct vm_map_entry {
100 	struct vm_map_entry *prev;	/* previous entry */
101 	struct vm_map_entry *next;	/* next entry */
102 	struct vm_map_entry *left;	/* left child in binary search tree */
103 	struct vm_map_entry *right;	/* right child in binary search tree */
104 	vm_offset_t start;		/* start address */
105 	vm_offset_t end;		/* end address */
106 	vm_offset_t avail_ssize;	/* amt can grow if this is a stack */
107 	vm_size_t adj_free;		/* amount of adjacent free space */
108 	vm_size_t max_free;		/* max free space in subtree */
109 	union vm_map_object object;	/* object I point to */
110 	vm_ooffset_t offset;		/* offset into object */
111 	vm_eflags_t eflags;		/* map entry flags */
112 	/* Only in task maps: */
113 	vm_prot_t protection;		/* protection code */
114 	vm_prot_t max_protection;	/* maximum protection */
115 	vm_inherit_t inheritance;	/* inheritance */
116 	int wired_count;		/* can be paged if = 0 */
117 	vm_pindex_t lastr;		/* last read */
118 };
119 
120 #define MAP_ENTRY_NOSYNC		0x0001
121 #define MAP_ENTRY_IS_SUB_MAP		0x0002
122 #define MAP_ENTRY_COW			0x0004
123 #define MAP_ENTRY_NEEDS_COPY		0x0008
124 #define MAP_ENTRY_NOFAULT		0x0010
125 #define MAP_ENTRY_USER_WIRED		0x0020
126 
127 #define MAP_ENTRY_BEHAV_NORMAL		0x0000	/* default behavior */
128 #define MAP_ENTRY_BEHAV_SEQUENTIAL	0x0040	/* expect sequential access */
129 #define MAP_ENTRY_BEHAV_RANDOM		0x0080	/* expect random access */
130 #define MAP_ENTRY_BEHAV_RESERVED	0x00C0	/* future use */
131 
132 #define MAP_ENTRY_BEHAV_MASK		0x00C0
133 
134 #define MAP_ENTRY_IN_TRANSITION		0x0100	/* entry being changed */
135 #define MAP_ENTRY_NEEDS_WAKEUP		0x0200	/* waiters in transition */
136 #define MAP_ENTRY_NOCOREDUMP		0x0400	/* don't include in a core */
137 
138 #define	MAP_ENTRY_GROWS_DOWN		0x1000	/* Top-down stacks */
139 #define	MAP_ENTRY_GROWS_UP		0x2000	/* Bottom-up stacks */
140 
141 #ifdef	_KERNEL
142 static __inline u_char
143 vm_map_entry_behavior(vm_map_entry_t entry)
144 {
145 	return (entry->eflags & MAP_ENTRY_BEHAV_MASK);
146 }
147 
148 static __inline int
149 vm_map_entry_user_wired_count(vm_map_entry_t entry)
150 {
151 	if (entry->eflags & MAP_ENTRY_USER_WIRED)
152 		return (1);
153 	return (0);
154 }
155 
156 static __inline int
157 vm_map_entry_system_wired_count(vm_map_entry_t entry)
158 {
159 	return (entry->wired_count - vm_map_entry_user_wired_count(entry));
160 }
161 #endif	/* _KERNEL */
162 
163 /*
164  *	A map is a set of map entries.  These map entries are
165  *	organized both as a binary search tree and as a doubly-linked
166  *	list.  Both structures are ordered based upon the start and
167  *	end addresses contained within each map entry.  Sleator and
168  *	Tarjan's top-down splay algorithm is employed to control
169  *	height imbalance in the binary search tree.
170  *
171  *	Note: the lock structure cannot be the first element of vm_map
172  *	because this can result in a running lockup between two or more
173  *	system processes trying to kmem_alloc_wait() due to kmem_alloc_wait()
174  *	and free tsleep/waking up 'map' and the underlying lockmgr also
175  *	sleeping and waking up on 'map'.  The lockup occurs when the map fills
176  *	up.  The 'exec' map, for example.
177  *
178  * List of locks
179  *	(c)	const until freed
180  */
181 struct vm_map {
182 	struct vm_map_entry header;	/* List of entries */
183 	struct sx lock;			/* Lock for map data */
184 	struct mtx system_mtx;
185 	int nentries;			/* Number of entries */
186 	vm_size_t size;			/* virtual size */
187 	u_int timestamp;		/* Version number */
188 	u_char needs_wakeup;
189 	u_char system_map;		/* Am I a system map? */
190 	vm_flags_t flags;		/* flags for this vm_map */
191 	vm_map_entry_t root;		/* Root of a binary search tree */
192 	pmap_t pmap;			/* (c) Physical map */
193 #define	min_offset	header.start	/* (c) */
194 #define	max_offset	header.end	/* (c) */
195 };
196 
197 /*
198  * vm_flags_t values
199  */
200 #define MAP_WIREFUTURE		0x01	/* wire all future pages */
201 
202 #ifdef	_KERNEL
203 static __inline vm_offset_t
204 vm_map_max(vm_map_t map)
205 {
206 	return (map->max_offset);
207 }
208 
209 static __inline vm_offset_t
210 vm_map_min(vm_map_t map)
211 {
212 	return (map->min_offset);
213 }
214 
215 static __inline pmap_t
216 vm_map_pmap(vm_map_t map)
217 {
218 	return (map->pmap);
219 }
220 
221 static __inline void
222 vm_map_modflags(vm_map_t map, vm_flags_t set, vm_flags_t clear)
223 {
224 	map->flags = (map->flags | set) & ~clear;
225 }
226 #endif	/* _KERNEL */
227 
228 /*
229  * Shareable process virtual address space.
230  *
231  * List of locks
232  *	(c)	const until freed
233  */
234 struct vmspace {
235 	struct vm_map vm_map;	/* VM address map */
236 	struct pmap vm_pmap;	/* private physical map */
237 	struct shmmap_state *vm_shm;	/* SYS5 shared memory private data XXX */
238 	segsz_t vm_swrss;	/* resident set size before last swap */
239 	segsz_t vm_tsize;	/* text size (pages) XXX */
240 	segsz_t vm_dsize;	/* data size (pages) XXX */
241 	segsz_t vm_ssize;	/* stack size (pages) */
242 	caddr_t vm_taddr;	/* (c) user virtual address of text */
243 	caddr_t vm_daddr;	/* (c) user virtual address of data */
244 	caddr_t vm_maxsaddr;	/* user VA at max stack growth */
245 	int	vm_exitingcnt;	/* several processes zombied in exit1  */
246 	int	vm_refcnt;	/* number of references */
247 };
248 
249 #ifdef	_KERNEL
250 static __inline pmap_t
251 vmspace_pmap(struct vmspace *vmspace)
252 {
253 	return &vmspace->vm_pmap;
254 }
255 #endif	/* _KERNEL */
256 
257 #ifdef	_KERNEL
258 /*
259  *	Macros:		vm_map_lock, etc.
260  *	Function:
261  *		Perform locking on the data portion of a map.  Note that
262  *		these macros mimic procedure calls returning void.  The
263  *		semicolon is supplied by the user of these macros, not
264  *		by the macros themselves.  The macros can safely be used
265  *		as unbraced elements in a higher level statement.
266  */
267 
268 void _vm_map_lock(vm_map_t map, const char *file, int line);
269 void _vm_map_unlock(vm_map_t map, const char *file, int line);
270 void _vm_map_lock_read(vm_map_t map, const char *file, int line);
271 void _vm_map_unlock_read(vm_map_t map, const char *file, int line);
272 int _vm_map_trylock(vm_map_t map, const char *file, int line);
273 int _vm_map_trylock_read(vm_map_t map, const char *file, int line);
274 int _vm_map_lock_upgrade(vm_map_t map, const char *file, int line);
275 void _vm_map_lock_downgrade(vm_map_t map, const char *file, int line);
276 int vm_map_unlock_and_wait(vm_map_t map, boolean_t user_wait);
277 void vm_map_wakeup(vm_map_t map);
278 
279 #define	vm_map_lock(map)	_vm_map_lock(map, LOCK_FILE, LOCK_LINE)
280 #define	vm_map_unlock(map)	_vm_map_unlock(map, LOCK_FILE, LOCK_LINE)
281 #define	vm_map_lock_read(map)	_vm_map_lock_read(map, LOCK_FILE, LOCK_LINE)
282 #define	vm_map_unlock_read(map)	_vm_map_unlock_read(map, LOCK_FILE, LOCK_LINE)
283 #define	vm_map_trylock(map)	_vm_map_trylock(map, LOCK_FILE, LOCK_LINE)
284 #define	vm_map_trylock_read(map)	\
285 			_vm_map_trylock_read(map, LOCK_FILE, LOCK_LINE)
286 #define	vm_map_lock_upgrade(map)	\
287 			_vm_map_lock_upgrade(map, LOCK_FILE, LOCK_LINE)
288 #define	vm_map_lock_downgrade(map)	\
289 			_vm_map_lock_downgrade(map, LOCK_FILE, LOCK_LINE)
290 
291 long vmspace_resident_count(struct vmspace *vmspace);
292 long vmspace_wired_count(struct vmspace *vmspace);
293 #endif	/* _KERNEL */
294 
295 
296 /* XXX: number of kernel maps and entries to statically allocate */
297 #define MAX_KMAP	10
298 #define	MAX_KMAPENT	128
299 #define	MAX_MAPENT	128
300 
301 /*
302  * Copy-on-write flags for vm_map operations
303  */
304 #define MAP_UNUSED_01		0x0001
305 #define MAP_COPY_ON_WRITE	0x0002
306 #define MAP_NOFAULT		0x0004
307 #define MAP_PREFAULT		0x0008
308 #define MAP_PREFAULT_PARTIAL	0x0010
309 #define MAP_DISABLE_SYNCER	0x0020
310 #define MAP_DISABLE_COREDUMP	0x0100
311 #define MAP_PREFAULT_MADVISE	0x0200	/* from (user) madvise request */
312 #define	MAP_STACK_GROWS_DOWN	0x1000
313 #define	MAP_STACK_GROWS_UP	0x2000
314 
315 /*
316  * vm_fault option flags
317  */
318 #define VM_FAULT_NORMAL 0		/* Nothing special */
319 #define VM_FAULT_CHANGE_WIRING 1	/* Change the wiring as appropriate */
320 #define VM_FAULT_USER_WIRE 2		/* Likewise, but for user purposes */
321 #define VM_FAULT_WIRE_MASK (VM_FAULT_CHANGE_WIRING|VM_FAULT_USER_WIRE)
322 #define VM_FAULT_DIRTY 8		/* Dirty the page */
323 
324 /*
325  * vm_map_wire and vm_map_unwire option flags
326  */
327 #define VM_MAP_WIRE_SYSTEM	0	/* wiring in a kernel map */
328 #define VM_MAP_WIRE_USER	1	/* wiring in a user map */
329 
330 #define VM_MAP_WIRE_NOHOLES	0	/* region must not have holes */
331 #define VM_MAP_WIRE_HOLESOK	2	/* region may have holes */
332 
333 #ifdef _KERNEL
334 boolean_t vm_map_check_protection (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t);
335 vm_map_t vm_map_create(pmap_t, vm_offset_t, vm_offset_t);
336 int vm_map_delete (vm_map_t, vm_offset_t, vm_offset_t);
337 int vm_map_find (vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, vm_size_t, boolean_t, vm_prot_t, vm_prot_t, int);
338 int vm_map_findspace (vm_map_t, vm_offset_t, vm_size_t, vm_offset_t *);
339 int vm_map_inherit (vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t);
340 void vm_map_init (struct vm_map *, vm_offset_t, vm_offset_t);
341 int vm_map_insert (vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t, vm_offset_t, vm_prot_t, vm_prot_t, int);
342 int vm_map_lookup (vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
343     vm_pindex_t *, vm_prot_t *, boolean_t *);
344 int vm_map_lookup_locked(vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
345     vm_pindex_t *, vm_prot_t *, boolean_t *);
346 void vm_map_lookup_done (vm_map_t, vm_map_entry_t);
347 boolean_t vm_map_lookup_entry (vm_map_t, vm_offset_t, vm_map_entry_t *);
348 void vm_map_pmap_enter(vm_map_t map, vm_offset_t addr, vm_prot_t prot,
349     vm_object_t object, vm_pindex_t pindex, vm_size_t size, int flags);
350 int vm_map_protect (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t);
351 int vm_map_remove (vm_map_t, vm_offset_t, vm_offset_t);
352 void vm_map_startup (void);
353 int vm_map_submap (vm_map_t, vm_offset_t, vm_offset_t, vm_map_t);
354 int vm_map_sync(vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t);
355 int vm_map_madvise (vm_map_t, vm_offset_t, vm_offset_t, int);
356 void vm_map_simplify_entry (vm_map_t, vm_map_entry_t);
357 void vm_init2 (void);
358 int vm_map_stack (vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int);
359 int vm_map_growstack (struct proc *p, vm_offset_t addr);
360 int vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
361     int flags);
362 int vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end,
363     int flags);
364 int vmspace_swap_count (struct vmspace *vmspace);
365 #endif				/* _KERNEL */
366 #endif				/* _VM_MAP_ */
367