/* $OpenBSD: vm_object.h,v 1.7 1997/10/06 20:21:24 deraadt Exp $ */ /* $NetBSD: vm_object.h,v 1.16 1995/03/29 22:10:28 briggs Exp $ */ /* * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * The Mach Operating System project at Carnegie-Mellon University. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)vm_object.h 8.3 (Berkeley) 1/12/94 * * * Copyright (c) 1987, 1990 Carnegie-Mellon University. * All rights reserved. * * Authors: Avadis Tevanian, Jr., Michael Wayne Young * * Permission to use, copy, modify and distribute this software and * its documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie the * rights to redistribute these changes. */ /* * Virtual memory object module definitions. */ #ifndef _VM_OBJECT_ #define _VM_OBJECT_ #include #include /* * Types defined: * * vm_object_t Virtual memory object. */ struct vm_object { struct pglist memq; /* Resident memory */ TAILQ_ENTRY(vm_object) object_list; /* list of all objects */ u_short flags; /* see below */ u_short paging_in_progress; /* Paging (in or out) so don't collapse or destroy */ simple_lock_data_t Lock; /* Synchronization */ int ref_count; /* How many refs?? */ vm_size_t size; /* Object size */ int resident_page_count; /* number of resident pages */ struct vm_object *copy; /* Object that holds copies of my changed pages */ vm_pager_t pager; /* Where to get data */ vm_offset_t paging_offset; /* Offset into paging space */ struct vm_object *shadow; /* My shadow */ vm_offset_t shadow_offset; /* Offset in shadow */ TAILQ_ENTRY(vm_object) cached_list; /* for persistence */ LIST_HEAD(, vm_object) shadowers; /* set of shadowers */ LIST_ENTRY(vm_object) shadowers_list; /* link to next shadower of this object's shadow */ }; /* * Flags */ #define OBJ_CANPERSIST 0x0001 /* allow to persist */ #define OBJ_INTERNAL 0x0002 /* internally created object */ #define OBJ_ACTIVE 0x0004 /* used to mark active objects */ #define OBJ_FADING 0x0008 /* tell others that the object is going away */ #define OBJ_WAITING 0x8000 /* someone is waiting for paging to finish */ TAILQ_HEAD(vm_object_hash_head, vm_object_hash_entry); struct vm_object_hash_entry { TAILQ_ENTRY(vm_object_hash_entry) hash_links; /* hash chain links */ vm_object_t object; /* object represented */ }; typedef struct vm_object_hash_entry *vm_object_hash_entry_t; #ifdef _KERNEL TAILQ_HEAD(object_q, vm_object); struct object_q vm_object_cached_list; /* list of objects persisting */ int vm_object_cached; /* size of cached list */ simple_lock_data_t vm_cache_lock; /* lock for object cache */ struct object_q vm_object_list; /* list of allocated objects */ long vm_object_count; /* count of all objects */ simple_lock_data_t vm_object_list_lock; /* lock for object list and count */ vm_object_t kernel_object; /* the single kernel object */ vm_object_t kmem_object; #define vm_object_cache_lock() simple_lock(&vm_cache_lock) #define vm_object_cache_unlock() simple_unlock(&vm_cache_lock) #endif /* _KERNEL */ #define vm_object_lock_init(object) simple_lock_init(&(object)->Lock) #define vm_object_lock(object) simple_lock(&(object)->Lock) #define vm_object_unlock(object) simple_unlock(&(object)->Lock) #define vm_object_lock_try(object) simple_lock_try(&(object)->Lock) #define vm_object_sleep(event, object, interruptible, where) \ do { \ (object)->flags |= OBJ_WAITING; \ thread_sleep_msg((event), &(object)->Lock, \ (interruptible), (where)); \ } while (0) #define vm_object_wakeup(object) \ do { \ if ((object)->flags & OBJ_WAITING) { \ (object)->flags &= ~OBJ_WAITING; \ thread_wakeup((object)); \ } \ } while (0) #define vm_object_paging(object) \ ((object)->paging_in_progress != 0) #ifndef DIAGNOSTIC #define vm_object_paging_begin(object) \ do { \ (object)->paging_in_progress++; \ } while (0) #else #define vm_object_paging_begin(object) \ do { \ if ((object)->paging_in_progress == 0xdead) \ panic("vm_object_paging_begin"); \ (object)->paging_in_progress++; \ } while (0) #endif #define vm_object_paging_end(object) \ do { \ if (--((object)->paging_in_progress) == 0) \ vm_object_wakeup((object)); \ } while (0) #define vm_object_paging_wait(object) \ do { \ while (vm_object_paging((object))) { \ vm_object_sleep((object), (object), FALSE, \ "vospgw"); \ vm_object_lock((object)); \ } \ } while (0) #ifdef _KERNEL vm_object_t vm_object_allocate __P((vm_size_t)); void vm_object_cache_clear __P((void)); void vm_object_cache_trim __P((void)); boolean_t vm_object_coalesce __P((vm_object_t, vm_object_t, vm_offset_t, vm_offset_t, vm_offset_t, vm_size_t)); void vm_object_collapse __P((vm_object_t)); void vm_object_copy __P((vm_object_t, vm_offset_t, vm_size_t, vm_object_t *, vm_offset_t *, boolean_t *)); void vm_object_deactivate_pages __P((vm_object_t)); void vm_object_deallocate __P((vm_object_t)); void vm_object_enter __P((vm_object_t, vm_pager_t)); void vm_object_init __P((vm_size_t)); vm_object_t vm_object_lookup __P((vm_pager_t)); boolean_t vm_object_page_clean __P((vm_object_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t)); void vm_object_page_remove __P((vm_object_t, vm_offset_t, vm_offset_t)); void vm_object_pmap_copy __P((vm_object_t, vm_offset_t, vm_offset_t)); void vm_object_pmap_remove __P((vm_object_t, vm_offset_t, vm_offset_t)); void vm_object_prefer __P((vm_object_t, vm_offset_t, vm_offset_t *)); void vm_object_print __P((vm_object_t, boolean_t)); void _vm_object_print __P((vm_object_t, boolean_t, int (*)(const char *, ...))); void vm_object_reference __P((vm_object_t)); void vm_object_remove __P((vm_pager_t)); void vm_object_setpager __P((vm_object_t, vm_pager_t, vm_offset_t, boolean_t)); void vm_object_shadow __P((vm_object_t *, vm_offset_t *, vm_size_t)); void vm_object_terminate __P((vm_object_t)); #endif #endif /* _VM_OBJECT_ */