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Diffstat (limited to 'sys/vm/vm_object.h')
| -rw-r--r-- | sys/vm/vm_object.h | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/sys/vm/vm_object.h b/sys/vm/vm_object.h new file mode 100644 index 000000000000..df243bf985b3 --- /dev/null +++ b/sys/vm/vm_object.h @@ -0,0 +1,173 @@ +/* + * 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. + * + * from: @(#)vm_object.h 7.3 (Berkeley) 4/21/91 + * $Id: vm_object.h,v 1.2 1993/10/16 16:20:43 rgrimes Exp $ + */ + +/* + * 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_ |