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/* $OpenBSD: vm_object.h,v 1.5 1997/04/17 01:25:21 niklas 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 <vm/vm_page.h>
#include <vm/vm_pager.h>
/*
* 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_ */
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