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_object.h 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 * $FreeBSD$ 61 */ 62 63 /* 64 * Virtual memory object module definitions. 65 */ 66 67 #ifndef _VM_OBJECT_ 68 #define _VM_OBJECT_ 69 70 #include <sys/queue.h> 71 #include <sys/_lock.h> 72 #include <sys/_mutex.h> 73 74 /* 75 * Types defined: 76 * 77 * vm_object_t Virtual memory object. 78 * 79 * List of locks 80 * (c) const until freed 81 * 82 */ 83 84 struct vm_object { 85 struct mtx mtx; 86 TAILQ_ENTRY(vm_object) object_list; /* list of all objects */ 87 LIST_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */ 88 LIST_ENTRY(vm_object) shadow_list; /* chain of shadow objects */ 89 TAILQ_HEAD(, vm_page) memq; /* list of resident pages */ 90 vm_page_t root; /* root of the resident page splay tree */ 91 vm_pindex_t size; /* Object size */ 92 int generation; /* generation ID */ 93 int ref_count; /* How many refs?? */ 94 int shadow_count; /* how many objects that this is a shadow for */ 95 objtype_t type; /* type of pager */ 96 u_short flags; /* see below */ 97 u_short pg_color; /* (c) color of first page in obj */ 98 u_short paging_in_progress; /* Paging (in or out) so don't collapse or destroy */ 99 int resident_page_count; /* number of resident pages */ 100 struct vm_object *backing_object; /* object that I'm a shadow of */ 101 vm_ooffset_t backing_object_offset;/* Offset in backing object */ 102 TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */ 103 LIST_HEAD(, vm_reserv) rvq; /* list of reservations */ 104 vm_page_t cache; /* root of the cache page splay tree */ 105 void *handle; 106 union { 107 /* 108 * VNode pager 109 * 110 * vnp_size - current size of file 111 */ 112 struct { 113 off_t vnp_size; 114 } vnp; 115 116 /* 117 * Device pager 118 * 119 * devp_pglist - list of allocated pages 120 */ 121 struct { 122 TAILQ_HEAD(, vm_page) devp_pglist; 123 } devp; 124 125 /* 126 * Swap pager 127 * 128 * swp_bcount - number of swap 'swblock' metablocks, each 129 * contains up to 16 swapblk assignments. 130 * see vm/swap_pager.h 131 */ 132 struct { 133 int swp_bcount; 134 } swp; 135 } un_pager; 136 }; 137 138 /* 139 * Flags 140 */ 141 #define OBJ_ACTIVE 0x0004 /* active objects */ 142 #define OBJ_DEAD 0x0008 /* dead objects (during rundown) */ 143 #define OBJ_NOSPLIT 0x0010 /* dont split this object */ 144 #define OBJ_PIPWNT 0x0040 /* paging in progress wanted */ 145 #define OBJ_MIGHTBEDIRTY 0x0100 /* object might be dirty */ 146 #define OBJ_CLEANING 0x0200 147 #define OBJ_COLORED 0x1000 /* pg_color is defined */ 148 #define OBJ_ONEMAPPING 0x2000 /* One USE (a single, non-forked) mapping flag */ 149 #define OBJ_DISCONNECTWNT 0x4000 /* disconnect from vnode wanted */ 150 #define OBJ_NEEDGIANT 0x8000 /* object requires Giant */ 151 152 #define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT) 153 #define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT)) 154 155 #ifdef _KERNEL 156 157 #define OBJPC_SYNC 0x1 /* sync I/O */ 158 #define OBJPC_INVAL 0x2 /* invalidate */ 159 #define OBJPC_NOSYNC 0x4 /* skip if PG_NOSYNC */ 160 161 TAILQ_HEAD(object_q, vm_object); 162 163 extern struct object_q vm_object_list; /* list of allocated objects */ 164 extern struct mtx vm_object_list_mtx; /* lock for object list and count */ 165 166 extern struct vm_object kernel_object_store; 167 extern struct vm_object kmem_object_store; 168 169 #define kernel_object (&kernel_object_store) 170 #define kmem_object (&kmem_object_store) 171 172 #define VM_OBJECT_LOCK(object) mtx_lock(&(object)->mtx) 173 #define VM_OBJECT_LOCK_ASSERT(object, type) \ 174 mtx_assert(&(object)->mtx, (type)) 175 #define VM_OBJECT_LOCK_INIT(object, type) \ 176 mtx_init(&(object)->mtx, "vm object", \ 177 (type), MTX_DEF | MTX_DUPOK) 178 #define VM_OBJECT_LOCKED(object) mtx_owned(&(object)->mtx) 179 #define VM_OBJECT_MTX(object) (&(object)->mtx) 180 #define VM_OBJECT_TRYLOCK(object) mtx_trylock(&(object)->mtx) 181 #define VM_OBJECT_UNLOCK(object) mtx_unlock(&(object)->mtx) 182 183 /* 184 * The object must be locked or thread private. 185 */ 186 static __inline void 187 vm_object_set_flag(vm_object_t object, u_short bits) 188 { 189 190 object->flags |= bits; 191 } 192 193 void vm_object_clear_flag(vm_object_t object, u_short bits); 194 void vm_object_pip_add(vm_object_t object, short i); 195 void vm_object_pip_subtract(vm_object_t object, short i); 196 void vm_object_pip_wakeup(vm_object_t object); 197 void vm_object_pip_wakeupn(vm_object_t object, short i); 198 void vm_object_pip_wait(vm_object_t object, char *waitid); 199 200 vm_object_t vm_object_allocate (objtype_t, vm_pindex_t); 201 void _vm_object_allocate (objtype_t, vm_pindex_t, vm_object_t); 202 boolean_t vm_object_coalesce(vm_object_t, vm_ooffset_t, vm_size_t, vm_size_t); 203 void vm_object_collapse (vm_object_t); 204 void vm_object_deallocate (vm_object_t); 205 void vm_object_terminate (vm_object_t); 206 void vm_object_set_writeable_dirty (vm_object_t); 207 void vm_object_init (void); 208 void vm_object_page_clean (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t); 209 void vm_object_page_remove (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t); 210 void vm_object_reference (vm_object_t); 211 void vm_object_reference_locked(vm_object_t); 212 void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t); 213 void vm_object_split(vm_map_entry_t); 214 void vm_object_sync(vm_object_t, vm_ooffset_t, vm_size_t, boolean_t, 215 boolean_t); 216 void vm_object_madvise (vm_object_t, vm_pindex_t, int, int); 217 #endif /* _KERNEL */ 218 219 #endif /* _VM_OBJECT_ */ 220