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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.
*
* from: @(#)vm_object.h 7.3 (Berkeley) 4/21/91
* $Id: vm_object.h,v 1.6 1994/01/14 16:27:25 davidg 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
extern queue_head_t vm_object_cached_list; /* list of objects persisting */
extern int vm_object_cached; /* size of cached list */
extern simple_lock_data_t vm_cache_lock; /* lock for object cache */
extern queue_head_t vm_object_list; /* list of allocated objects */
extern long vm_object_count; /* count of all objects */
extern simple_lock_data_t vm_object_list_lock;
/* lock for object list and count */
extern vm_object_t kernel_object; /* the single kernel object */
extern 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((int)(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((int)(event), &(object)->Lock, (interruptible))
#endif /* VM_OBJECT_DEBUG */
extern void vm_object_page_clean(vm_object_t, vm_offset_t, vm_offset_t);
extern int pager_cache(vm_object_t, boolean_t);
#endif /* _VM_OBJECT_ */
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