2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * The Mach Operating System project at Carnegie-Mellon University.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * from: @(#)vm_object.h 8.3 (Berkeley) 1/12/94
39 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
40 * All rights reserved.
42 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
44 * Permission to use, copy, modify and distribute this software and
45 * its documentation is hereby granted, provided that both the copyright
46 * notice and this permission notice appear in all copies of the
47 * software, derivative works or modified versions, and any portions
48 * thereof, and that both notices appear in supporting documentation.
50 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
51 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
52 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
54 * Carnegie Mellon requests users of this software to return to
56 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
57 * School of Computer Science
58 * Carnegie Mellon University
59 * Pittsburgh PA 15213-3890
61 * any improvements or extensions that they make and grant Carnegie the
62 * rights to redistribute these changes.
64 * $FreeBSD: src/sys/vm/vm_object.h,v 1.63.2.3 2003/05/26 19:17:56 alc Exp $
65 * $DragonFly: src/sys/vm/vm_object.h,v 1.14 2007/06/08 02:00:47 dillon Exp $
69 * Virtual memory object module definitions.
72 #ifndef _VM_VM_OBJECT_H_
73 #define _VM_VM_OBJECT_H_
76 #include <sys/types.h>
78 #if defined(_KERNEL) && !defined(_SYS_SYSTM_H_)
79 #include <sys/systm.h>
82 #include <sys/queue.h>
87 #ifndef _SYS_THREAD_H_
88 #include <sys/thread.h>
90 #ifndef _MACHINE_ATOMIC_H_
91 #include <machine/atomic.h>
96 #ifndef _VM_VM_PAGE_H_
97 #include <vm/vm_page.h>
102 #ifndef _SYS_THREAD2_H_
103 #include <sys/thread2.h>
109 struct swblock_rb_tree;
110 int rb_swblock_compare(struct swblock *, struct swblock *);
112 RB_PROTOTYPE2(swblock_rb_tree, swblock, swb_entry, rb_swblock_compare,
117 OBJT_SWAP, /* object backed by swap blocks */
118 OBJT_VNODE, /* object backed by file pages (vnode) */
119 OBJT_DEVICE, /* object backed by device pages */
120 OBJT_PHYS, /* object backed by physical pages */
121 OBJT_DEAD, /* dead object */
122 OBJT_MARKER /* marker object */
124 typedef u_char objtype_t;
127 * vm_object_lock A lock covering byte ranges within a VM object
130 struct vm_object_lock {
131 struct vm_object_lock *next;
132 int type; /* type of lock */
133 int waiting; /* someone is waiting on the lock */
134 off_t base; /* byte offset into object */
135 off_t bytes; /* extent in bytes */
138 #define VMOBJ_LOCK_SHARED 1
139 #define VMOBJ_LOCK_EXCL 2
142 * vm_object A VM object which represents an arbitrarily sized
145 * Locking requirements: vmobj_token for ref_count and object_list, and
146 * vm_token for everything else.
149 TAILQ_ENTRY(vm_object) object_list; /* vmobj_token */
150 LIST_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */
151 LIST_ENTRY(vm_object) shadow_list; /* chain of shadow objects */
152 RB_HEAD(vm_page_rb_tree, vm_page) rb_memq; /* resident pages */
153 int generation; /* generation ID */
154 vm_pindex_t size; /* Object size */
155 int ref_count; /* vmobj_token */
156 int shadow_count; /* how many objects that this is a shadow for */
157 int hash_rand; /* vm hash table randomizer */
158 objtype_t type; /* type of pager */
159 u_short flags; /* see below */
160 u_short pg_color; /* color of first page in obj */
162 int paging_in_progress; /* Paging (in or out) so don't collapse or destroy */
163 int resident_page_count; /* number of resident pages */
164 u_int agg_pv_list_count; /* aggregate pv list count */
165 struct vm_object *backing_object; /* object that I'm a shadow of */
166 vm_ooffset_t backing_object_offset;/* Offset in backing object */
167 TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */
169 vm_object_lock_t range_locks;
174 * devp_pglist - list of allocated pages
177 TAILQ_HEAD(, vm_page) devp_pglist;
182 * OBJT_SWAP and OBJT_VNODE VM objects may have swap backing
183 * store. For vnodes the swap backing store acts as a fast
184 * data cache but the vnode contains the official data.
186 RB_HEAD(swblock_rb_tree, swblock) swblock_root;
193 #define OBJ_ACTIVE 0x0004 /* active objects */
194 #define OBJ_DEAD 0x0008 /* dead objects (during rundown) */
195 #define OBJ_NOSPLIT 0x0010 /* dont split this object */
196 #define OBJ_PIPWNT 0x0040 /* paging in progress wanted */
197 #define OBJ_WRITEABLE 0x0080 /* object has been made writable */
198 #define OBJ_MIGHTBEDIRTY 0x0100 /* object might be dirty */
199 #define OBJ_CLEANING 0x0200
200 #define OBJ_DEADWNT 0x1000 /* waiting because object is dead */
201 #define OBJ_ONEMAPPING 0x2000 /* One USE (a single, non-forked) mapping flag */
202 #define OBJ_NOMSYNC 0x4000 /* disable msync() system call */
204 #define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
205 #define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT))
209 #define OBJPC_SYNC 0x1 /* sync I/O */
210 #define OBJPC_INVAL 0x2 /* invalidate */
211 #define OBJPC_NOSYNC 0x4 /* skip if PG_NOSYNC */
213 TAILQ_HEAD(object_q, vm_object);
215 extern struct object_q vm_object_list; /* list of allocated objects */
217 /* lock for object list and count */
219 extern struct vm_object kernel_object; /* the single kernel object */
226 vm_object_set_flag(vm_object_t object, u_int bits)
228 atomic_set_short(&object->flags, bits);
232 vm_object_clear_flag(vm_object_t object, u_int bits)
234 atomic_clear_short(&object->flags, bits);
238 vm_object_pip_add(vm_object_t object, int i)
240 atomic_add_int(&object->paging_in_progress, i);
244 vm_object_pip_subtract(vm_object_t object, int i)
246 atomic_subtract_int(&object->paging_in_progress, i);
250 vm_object_pip_wakeup(vm_object_t object)
252 atomic_subtract_int(&object->paging_in_progress, 1);
253 if ((object->flags & OBJ_PIPWNT) && object->paging_in_progress == 0) {
254 vm_object_clear_flag(object, OBJ_PIPWNT);
260 vm_object_pip_wakeupn(vm_object_t object, int i)
263 atomic_subtract_int(&object->paging_in_progress, i);
264 if ((object->flags & OBJ_PIPWNT) && object->paging_in_progress == 0) {
265 vm_object_clear_flag(object, OBJ_PIPWNT);
271 vm_object_pip_sleep(vm_object_t object, char *waitid)
273 if (object->paging_in_progress) {
275 if (object->paging_in_progress) {
276 vm_object_set_flag(object, OBJ_PIPWNT);
277 tsleep(object, 0, waitid, 0);
284 vm_object_pip_wait(vm_object_t object, char *waitid)
286 while (object->paging_in_progress)
287 vm_object_pip_sleep(object, waitid);
290 vm_object_t vm_object_allocate (objtype_t, vm_pindex_t);
291 void _vm_object_allocate (objtype_t, vm_pindex_t, vm_object_t);
292 boolean_t vm_object_coalesce (vm_object_t, vm_pindex_t, vm_size_t, vm_size_t);
293 void vm_object_collapse (vm_object_t);
294 void vm_object_deallocate (vm_object_t);
295 void vm_object_deallocate_locked (vm_object_t);
296 void vm_object_terminate (vm_object_t);
297 void vm_object_set_writeable_dirty (vm_object_t);
298 void vm_object_init (void);
299 void vm_object_page_clean (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
300 void vm_object_page_remove (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
301 void vm_object_pmap_copy (vm_object_t, vm_pindex_t, vm_pindex_t);
302 void vm_object_pmap_copy_1 (vm_object_t, vm_pindex_t, vm_pindex_t);
303 void vm_object_pmap_remove (vm_object_t, vm_pindex_t, vm_pindex_t);
304 void vm_object_reference (vm_object_t);
305 void vm_object_reference_locked (vm_object_t);
306 void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t);
307 void vm_object_madvise (vm_object_t, vm_pindex_t, int, int);
308 void vm_object_init2 (void);
309 vm_page_t vm_fault_object_page(vm_object_t, vm_ooffset_t, vm_prot_t, int, int *);
310 void vm_object_dead_sleep(vm_object_t, const char *);
311 void vm_object_dead_wakeup(vm_object_t);
315 #endif /* _VM_VM_OBJECT_H_ */