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- /*
- * Copyright (c) 1991 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 7.3 (Berkeley) 4/21/91
- *
- *
- * 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 <vm/vm_pager.h>
-
- /*
- * Types defined:
- *
- * vm_object_t Virtual memory object.
- */
-
- struct vm_object {
- queue_chain_t memq; /* Resident memory */
- queue_chain_t object_list; /* list of all objects */
- simple_lock_data_t Lock; /* Synchronization */
- int LockHolder;
- 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 */
- boolean_t pager_ready; /* Have pager fields been filled? */
- vm_offset_t paging_offset; /* Offset into paging space */
- struct vm_object *shadow; /* My shadow */
- vm_offset_t shadow_offset; /* Offset in shadow */
- unsigned int
- paging_in_progress:16,
- /* Paging (in or out) - don't
- collapse or destroy */
- /* boolean_t */ can_persist:1, /* allow to persist */
- /* boolean_t */ internal:1; /* internally created object */
- queue_chain_t cached_list; /* for persistence */
- };
-
- typedef struct vm_object *vm_object_t;
-
- struct vm_object_hash_entry {
- queue_chain_t hash_links; /* hash chain links */
- vm_object_t object; /* object we represent */
- };
-
- typedef struct vm_object_hash_entry *vm_object_hash_entry_t;
-
- #ifdef KERNEL
- queue_head_t 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 */
-
- queue_head_t 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
-
- /*
- * Declare procedures that operate on VM objects.
- */
-
- void vm_object_init ();
- void vm_object_terminate();
- vm_object_t vm_object_allocate();
- void vm_object_reference();
- void vm_object_deallocate();
- void vm_object_pmap_copy();
- void vm_object_pmap_remove();
- void vm_object_page_remove();
- void vm_object_shadow();
- void vm_object_copy();
- void vm_object_collapse();
- vm_object_t vm_object_lookup();
- void vm_object_enter();
- void vm_object_setpager();
- #define vm_object_cache(pager) pager_cache(vm_object_lookup(pager),TRUE)
- #define vm_object_uncache(pager) pager_cache(vm_object_lookup(pager),FALSE)
-
- void vm_object_cache_clear();
- void vm_object_print();
-
- #if VM_OBJECT_DEBUG
- #define vm_object_lock_init(object) { simple_lock_init(&(object)->Lock); (object)->LockHolder = 0; }
- #define vm_object_lock(object) { simple_lock(&(object)->Lock); (object)->LockHolder = (int) current_thread(); }
- #define vm_object_unlock(object) { (object)->LockHolder = 0; simple_unlock(&(object)->Lock); }
- #define vm_object_lock_try(object) (simple_lock_try(&(object)->Lock) ? ( ((object)->LockHolder = (int) current_thread()) , TRUE) : FALSE)
- #define vm_object_sleep(event, object, interruptible) \
- { (object)->LockHolder = 0; thread_sleep((event), &(object)->Lock, (interruptible)); }
- #else VM_OBJECT_DEBUG
- #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) \
- thread_sleep((event), &(object)->Lock, (interruptible))
- #endif VM_OBJECT_DEBUG
-
- #endif _VM_OBJECT_
-