173 lines
6.7 KiB
C
173 lines
6.7 KiB
C
/*
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* Copyright (c) 1991 Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)vm_object.h 7.3 (Berkeley) 4/21/91
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* $Id: vm_object.h,v 1.4 1993/07/29 21:45:40 jtc Exp $
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#ifndef _VM_VM_OBJECT_H_
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#define _VM_VM_OBJECT_H_
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/*
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* Virtual memory object module definitions.
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*/
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#include <vm/vm_pager.h>
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/*
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* Types defined:
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*
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* vm_object_t Virtual memory object.
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*/
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struct vm_object {
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queue_chain_t memq; /* Resident memory */
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queue_chain_t object_list; /* list of all objects */
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simple_lock_data_t Lock; /* Synchronization */
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int LockHolder;
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int ref_count; /* How many refs?? */
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vm_size_t size; /* Object size */
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int resident_page_count;
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/* number of resident pages */
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struct vm_object *copy; /* Object that holds copies of
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my changed pages */
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vm_pager_t pager; /* Where to get data */
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boolean_t pager_ready; /* Have pager fields been filled? */
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vm_offset_t paging_offset; /* Offset into paging space */
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struct vm_object *shadow; /* My shadow */
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vm_offset_t shadow_offset; /* Offset in shadow */
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unsigned int
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paging_in_progress:16,
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/* Paging (in or out) - don't
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collapse or destroy */
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/* boolean_t */ can_persist:1, /* allow to persist */
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/* boolean_t */ internal:1; /* internally created object */
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queue_chain_t cached_list; /* for persistence */
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};
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typedef struct vm_object *vm_object_t;
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struct vm_object_hash_entry {
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queue_chain_t hash_links; /* hash chain links */
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vm_object_t object; /* object we represent */
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};
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typedef struct vm_object_hash_entry *vm_object_hash_entry_t;
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#ifdef KERNEL
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queue_head_t vm_object_cached_list; /* list of objects persisting */
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int vm_object_cached; /* size of cached list */
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simple_lock_data_t vm_cache_lock; /* lock for object cache */
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queue_head_t vm_object_list; /* list of allocated objects */
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long vm_object_count; /* count of all objects */
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simple_lock_data_t vm_object_list_lock;
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/* lock for object list and count */
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vm_object_t kernel_object; /* the single kernel object */
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vm_object_t kmem_object;
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#define vm_object_cache_lock() simple_lock(&vm_cache_lock)
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#define vm_object_cache_unlock() simple_unlock(&vm_cache_lock)
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#endif /* KERNEL */
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/*
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* Declare procedures that operate on VM objects.
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*/
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void vm_object_init ();
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void vm_object_terminate();
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vm_object_t vm_object_allocate();
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void vm_object_reference();
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void vm_object_deallocate();
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void vm_object_pmap_copy();
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void vm_object_pmap_remove();
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void vm_object_page_remove();
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void vm_object_shadow();
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void vm_object_copy();
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void vm_object_collapse();
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vm_object_t vm_object_lookup();
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void vm_object_enter();
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void vm_object_setpager();
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#define vm_object_cache(pager) pager_cache(vm_object_lookup(pager),TRUE)
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#define vm_object_uncache(pager) pager_cache(vm_object_lookup(pager),FALSE)
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void vm_object_cache_clear();
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void vm_object_print();
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#if VM_OBJECT_DEBUG
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#define vm_object_lock_init(object) { simple_lock_init(&(object)->Lock); (object)->LockHolder = 0; }
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#define vm_object_lock(object) { simple_lock(&(object)->Lock); (object)->LockHolder = (int) current_thread(); }
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#define vm_object_unlock(object) { (object)->LockHolder = 0; simple_unlock(&(object)->Lock); }
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#define vm_object_lock_try(object) (simple_lock_try(&(object)->Lock) ? ( ((object)->LockHolder = (int) current_thread()) , TRUE) : FALSE)
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#define vm_object_sleep(event, object, interruptible) \
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{ (object)->LockHolder = 0; thread_sleep((event), &(object)->Lock, (interruptible)); }
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#else /* VM_OBJECT_DEBUG */
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#define vm_object_lock_init(object) simple_lock_init(&(object)->Lock)
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#define vm_object_lock(object) simple_lock(&(object)->Lock)
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#define vm_object_unlock(object) simple_unlock(&(object)->Lock)
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#define vm_object_lock_try(object) simple_lock_try(&(object)->Lock)
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#define vm_object_sleep(event, object, interruptible) \
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thread_sleep((event), &(object)->Lock, (interruptible))
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#endif /* VM_OBJECT_DEBUG */
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#endif /* !_VM_VM_OBJECT_H_ */
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