vm_object.h revision 65103
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 * $FreeBSD: head/sys/vm/vm_object.h 65103 2000-08-26 04:51:39Z obrien $ 65 */ 66 67/* 68 * Virtual memory object module definitions. 69 */ 70 71#ifndef _VM_OBJECT_ 72#define _VM_OBJECT_ 73 74#include <sys/queue.h> 75#include <machine/atomic.h> 76 77enum obj_type { OBJT_DEFAULT, OBJT_SWAP, OBJT_VNODE, OBJT_DEVICE, OBJT_PHYS, 78 OBJT_DEAD }; 79typedef u_char objtype_t; 80 81/* 82 * Types defined: 83 * 84 * vm_object_t Virtual memory object. 85 * 86 */ 87 88struct vm_object { 89 TAILQ_ENTRY(vm_object) object_list; /* list of all objects */ 90 TAILQ_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */ 91 TAILQ_ENTRY(vm_object) shadow_list; /* chain of shadow objects */ 92 TAILQ_HEAD(, vm_page) memq; /* list of resident pages */ 93 int generation; /* generation ID */ 94 vm_size_t size; /* Object size */ 95 int ref_count; /* How many refs?? */ 96 int shadow_count; /* how many objects that this is a shadow for */ 97 int hash_rand; /* vm hash table randomizer */ 98 objtype_t type; /* type of pager */ 99 u_short flags; /* see below */ 100 u_short pg_color; /* color of first page in obj */ 101 u_short paging_in_progress; /* Paging (in or out) so don't collapse or destroy */ 102 int resident_page_count; /* number of resident pages */ 103 struct vm_object *backing_object; /* object that I'm a shadow of */ 104 vm_ooffset_t backing_object_offset;/* Offset in backing object */ 105 TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */ 106 void *handle; 107 union { 108 /* 109 * VNode pager 110 * 111 * vnp_size - current size of file 112 */ 113 struct { 114 off_t vnp_size; 115 } vnp; 116 117 /* 118 * Device pager 119 * 120 * devp_pglist - list of allocated pages 121 */ 122 struct { 123 TAILQ_HEAD(, vm_page) devp_pglist; 124 } devp; 125 126 /* 127 * Swap pager 128 * 129 * swp_bcount - number of swap 'swblock' metablocks, each 130 * contains up to 16 swapblk assignments. 131 * see vm/swap_pager.h 132 */ 133 struct { 134 int swp_bcount; 135 } swp; 136 } un_pager; 137}; 138 139/* 140 * Flags 141 */ 142#define OBJ_ACTIVE 0x0004 /* active objects */ 143#define OBJ_DEAD 0x0008 /* dead objects (during rundown) */ 144#define OBJ_NOSPLIT 0x0010 /* dont split this object */ 145#define OBJ_PIPWNT 0x0040 /* paging in progress wanted */ 146#define OBJ_WRITEABLE 0x0080 /* object has been made writable */ 147#define OBJ_MIGHTBEDIRTY 0x0100 /* object might be dirty */ 148#define OBJ_CLEANING 0x0200 149#define OBJ_OPT 0x1000 /* I/O optimization */ 150#define OBJ_ONEMAPPING 0x2000 /* One USE (a single, non-forked) mapping flag */ 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 161TAILQ_HEAD(object_q, vm_object); 162 163extern struct object_q vm_object_list; /* list of allocated objects */ 164 165 /* lock for object list and count */ 166 167extern vm_object_t kernel_object; /* the single kernel object */ 168extern vm_object_t kmem_object; 169 170#endif /* _KERNEL */ 171 172#ifdef _KERNEL 173 174static __inline void 175vm_object_set_flag(vm_object_t object, u_short bits) 176{ 177 atomic_set_short(&object->flags, bits); 178} 179 180static __inline void 181vm_object_clear_flag(vm_object_t object, u_short bits) 182{ 183 atomic_clear_short(&object->flags, bits); 184} 185 186static __inline void 187vm_object_pip_add(vm_object_t object, short i) 188{ 189 atomic_add_short(&object->paging_in_progress, i); 190} 191 192static __inline void 193vm_object_pip_subtract(vm_object_t object, short i) 194{ 195 atomic_subtract_short(&object->paging_in_progress, i); 196} 197 198static __inline void 199vm_object_pip_wakeup(vm_object_t object) 200{ 201 atomic_subtract_short(&object->paging_in_progress, 1); 202 if ((object->flags & OBJ_PIPWNT) && object->paging_in_progress == 0) { 203 vm_object_clear_flag(object, OBJ_PIPWNT); 204 wakeup(object); 205 } 206} 207 208static __inline void 209vm_object_pip_wakeupn(vm_object_t object, short i) 210{ 211 if (i) 212 atomic_subtract_short(&object->paging_in_progress, i); 213 if ((object->flags & OBJ_PIPWNT) && object->paging_in_progress == 0) { 214 vm_object_clear_flag(object, OBJ_PIPWNT); 215 wakeup(object); 216 } 217} 218 219static __inline void 220vm_object_pip_sleep(vm_object_t object, char *waitid) 221{ 222 if (object->paging_in_progress) { 223 int s = splvm(); 224 if (object->paging_in_progress) { 225 vm_object_set_flag(object, OBJ_PIPWNT); 226 tsleep(object, PVM, waitid, 0); 227 } 228 splx(s); 229 } 230} 231 232static __inline void 233vm_object_pip_wait(vm_object_t object, char *waitid) 234{ 235 while (object->paging_in_progress) 236 vm_object_pip_sleep(object, waitid); 237} 238 239vm_object_t vm_object_allocate __P((objtype_t, vm_size_t)); 240void _vm_object_allocate __P((objtype_t, vm_size_t, vm_object_t)); 241boolean_t vm_object_coalesce __P((vm_object_t, vm_pindex_t, vm_size_t, vm_size_t)); 242void vm_object_collapse __P((vm_object_t)); 243void vm_object_deallocate __P((vm_object_t)); 244void vm_object_terminate __P((vm_object_t)); 245void vm_object_vndeallocate __P((vm_object_t)); 246void vm_object_init __P((void)); 247void vm_object_page_clean __P((vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t)); 248void vm_object_page_remove __P((vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t)); 249void vm_object_pmap_copy __P((vm_object_t, vm_pindex_t, vm_pindex_t)); 250void vm_object_pmap_copy_1 __P((vm_object_t, vm_pindex_t, vm_pindex_t)); 251void vm_object_pmap_remove __P((vm_object_t, vm_pindex_t, vm_pindex_t)); 252void vm_object_reference __P((vm_object_t)); 253void vm_object_shadow __P((vm_object_t *, vm_ooffset_t *, vm_size_t)); 254void vm_object_madvise __P((vm_object_t, vm_pindex_t, int, int)); 255void vm_object_init2 __P((void)); 256#endif /* _KERNEL */ 257 258#endif /* _VM_OBJECT_ */ 259