vm_object.h revision 7016
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 * 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. 23 * 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 34 * SUCH DAMAGE. 35 * 36 * from: @(#)vm_object.h 8.3 (Berkeley) 1/12/94 37 * 38 * 39 * Copyright (c) 1987, 1990 Carnegie-Mellon University. 40 * All rights reserved. 41 * 42 * Authors: Avadis Tevanian, Jr., Michael Wayne Young 43 * 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. 49 * 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. 53 * 54 * Carnegie Mellon requests users of this software to return to 55 * 56 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 57 * School of Computer Science 58 * Carnegie Mellon University 59 * Pittsburgh PA 15213-3890 60 * 61 * any improvements or extensions that they make and grant Carnegie the 62 * rights to redistribute these changes. 63 * 64 * $Id: vm_object.h,v 1.10 1995/03/04 21:14:19 jkh Exp $ 65 */ 66 67/* 68 * Virtual memory object module definitions. 69 */ 70 71#ifndef _VM_OBJECT_ 72#define _VM_OBJECT_ 73 74#include <vm/vm_page.h> 75#include <vm/vm_pager.h> 76 77/* 78 * Types defined: 79 * 80 * vm_object_t Virtual memory object. 81 */ 82 83struct vm_object { 84 struct pglist memq; /* Resident memory */ 85 TAILQ_HEAD(rslist, vm_object) reverse_shadow_head; /* objects that this is a shadow for */ 86 TAILQ_ENTRY(vm_object) object_list; /* list of all objects */ 87 TAILQ_ENTRY(vm_object) reverse_shadow_list; /* chain of objects that are shadowed */ 88 TAILQ_ENTRY(vm_object) cached_list; /* for persistence */ 89 vm_size_t size; /* Object size */ 90 int ref_count; /* How many refs?? */ 91 u_short flags; /* see below */ 92 u_short paging_in_progress; /* Paging (in or out) so don't collapse or destroy */ 93 int resident_page_count; /* number of resident pages */ 94 vm_pager_t pager; /* Where to get data */ 95 vm_offset_t paging_offset; /* Offset into paging space */ 96 struct vm_object *shadow; /* My shadow */ 97 vm_offset_t shadow_offset; /* Offset in shadow */ 98 struct vm_object *copy; /* Object that holds copies of my changed pages */ 99 vm_offset_t last_read; /* last read in object -- detect seq behavior */ 100}; 101 102/* 103 * Flags 104 */ 105#define OBJ_CANPERSIST 0x0001 /* allow to persist */ 106#define OBJ_INTERNAL 0x0002 /* internally created object */ 107#define OBJ_ACTIVE 0x0004 /* used to mark active objects */ 108#define OBJ_DEAD 0x0008 /* used to mark dead objects during rundown */ 109#define OBJ_ILOCKED 0x0010 /* lock from modification */ 110#define OBJ_ILOCKWT 0x0020 /* wait for lock from modification */ 111#define OBJ_PIPWNT 0x0040 /* paging in progress wanted */ 112 113TAILQ_HEAD(vm_object_hash_head, vm_object_hash_entry); 114 115struct vm_object_hash_entry { 116 TAILQ_ENTRY(vm_object_hash_entry) hash_links; /* hash chain links */ 117 vm_object_t object; /* object represened */ 118}; 119 120typedef struct vm_object_hash_entry *vm_object_hash_entry_t; 121 122#ifdef KERNEL 123TAILQ_HEAD(object_q, vm_object); 124 125struct object_q vm_object_cached_list; /* list of objects persisting */ 126int vm_object_cached; /* size of cached list */ 127simple_lock_data_t vm_cache_lock; /* lock for object cache */ 128 129struct object_q vm_object_list; /* list of allocated objects */ 130long vm_object_count; /* count of all objects */ 131simple_lock_data_t vm_object_list_lock; 132 133 /* lock for object list and count */ 134 135vm_object_t kernel_object; /* the single kernel object */ 136vm_object_t kmem_object; 137 138#define vm_object_cache_lock() simple_lock(&vm_cache_lock) 139#define vm_object_cache_unlock() simple_unlock(&vm_cache_lock) 140#endif /* KERNEL */ 141 142#if 1 143#define vm_object_lock_init(object) simple_lock_init(&(object)->Lock) 144#define vm_object_lock(object) simple_lock(&(object)->Lock) 145#define vm_object_unlock(object) simple_unlock(&(object)->Lock) 146#define vm_object_lock_try(object) simple_lock_try(&(object)->Lock) 147#endif 148 149__inline static void 150vm_object_pip_wakeup( vm_object_t object) { 151 object->paging_in_progress--; 152 if ((object->flags & OBJ_PIPWNT) && 153 object->paging_in_progress == 0) { 154 object->flags &= ~OBJ_PIPWNT; 155 wakeup(object); 156 } 157} 158 159#ifdef KERNEL 160vm_object_t vm_object_allocate __P((vm_size_t)); 161void vm_object_cache_clear __P((void)); 162void vm_object_cache_trim __P((void)); 163boolean_t vm_object_coalesce __P((vm_object_t, vm_object_t, vm_offset_t, vm_offset_t, vm_offset_t, vm_size_t)); 164void vm_object_collapse __P((vm_object_t)); 165void vm_object_copy __P((vm_object_t, vm_offset_t, vm_size_t, vm_object_t *, vm_offset_t *, boolean_t *)); 166void vm_object_deactivate_pages __P((vm_object_t)); 167void vm_object_deallocate __P((vm_object_t)); 168void vm_object_enter __P((vm_object_t, vm_pager_t)); 169void vm_object_init __P((vm_size_t)); 170vm_object_t vm_object_lookup __P((vm_pager_t)); 171boolean_t vm_object_page_clean __P((vm_object_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t)); 172void vm_object_page_remove __P((vm_object_t, vm_offset_t, vm_offset_t)); 173void vm_object_pmap_copy __P((vm_object_t, vm_offset_t, vm_offset_t)); 174void vm_object_pmap_remove __P((vm_object_t, vm_offset_t, vm_offset_t)); 175void vm_object_print __P((vm_object_t, boolean_t)); 176void vm_object_reference __P((vm_object_t)); 177void vm_object_remove __P((vm_pager_t)); 178void vm_object_shadow __P((vm_object_t *, vm_offset_t *, vm_size_t)); 179void vm_object_terminate __P((vm_object_t)); 180 181#endif 182#endif /* _VM_OBJECT_ */ 183