236 lines
8.6 KiB
C
236 lines
8.6 KiB
C
/* $NetBSD: vm_object.h,v 1.22 1998/01/31 04:02:43 ross Exp $ */
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/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. 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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* @(#)vm_object.h 8.3 (Berkeley) 1/12/94
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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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/*
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* Virtual memory object module definitions.
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*/
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#ifndef _VM_OBJECT_
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#define _VM_OBJECT_
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#include <vm/vm_page.h>
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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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struct pglist memq; /* Resident memory */
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TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
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u_short flags; /* see below */
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u_short paging_in_progress; /* Paging (in or out) so
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don't collapse or destroy */
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simple_lock_data_t Lock; /* Synchronization */
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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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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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TAILQ_ENTRY(vm_object) cached_list; /* for persistence */
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LIST_HEAD(, vm_object) shadowers; /* set of shadowers */
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LIST_ENTRY(vm_object) shadowers_list; /* link to next shadower of
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this object's shadow */
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};
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/*
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* Flags
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*/
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#define OBJ_CANPERSIST 0x0001 /* allow to persist */
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#define OBJ_INTERNAL 0x0002 /* internally created object */
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#define OBJ_ACTIVE 0x0004 /* used to mark active objects */
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#define OBJ_FADING 0x0008 /* tell others that the object is going away */
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#define OBJ_WAITING 0x8000 /* someone is waiting for paging to finish */
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TAILQ_HEAD(vm_object_hash_head, vm_object_hash_entry);
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struct vm_object_hash_entry {
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TAILQ_ENTRY(vm_object_hash_entry) hash_links; /* hash chain links */
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vm_object_t object; /* object represented */
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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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TAILQ_HEAD(object_q, vm_object);
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struct object_q 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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struct object_q 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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#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, where) \
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do { \
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(object)->flags |= OBJ_WAITING; \
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thread_sleep_msg((event), &(object)->Lock, \
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(interruptible), (where), 0); \
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} while (0)
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#define vm_object_wakeup(object) \
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do { \
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if ((object)->flags & OBJ_WAITING) { \
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(object)->flags &= ~OBJ_WAITING; \
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thread_wakeup((object)); \
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} \
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} while (0)
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#define vm_object_paging(object) \
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((object)->paging_in_progress != 0)
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#ifdef DIAGNOSTIC
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/* Hope 0xdead is an unlikely value of either field */
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#if BYTE_ORDER == BIG_ENDIAN
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#define __VMOBJECT_IS_DEAD(object) \
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((object)->flags == 0xdead)
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#else
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#define __VMOBJECT_IS_DEAD(object) \
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((object)->paging_in_progress == 0xdead)
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#endif /* BIG_ENDIAN */
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#else
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#define __VMOBJECT_IS_DEAD(object) (0)
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#endif /* DIAGNOSTIC */
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#define vm_object_paging_begin(object) \
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do { \
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if (__VMOBJECT_IS_DEAD(object)) \
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panic("vm_object_paging_begin"); \
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(object)->paging_in_progress++; \
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} while (0)
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#define vm_object_paging_end(object) \
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do { \
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if (--((object)->paging_in_progress) == 0) \
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vm_object_wakeup((object)); \
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} while (0)
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#define vm_object_paging_wait(object,msg) \
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do { \
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while (vm_object_paging((object))) { \
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vm_object_sleep((object), (object), FALSE, \
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(msg)); \
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vm_object_lock((object)); \
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} \
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} while (0)
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#ifdef _KERNEL
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vm_object_t vm_object_allocate __P((vm_size_t));
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void vm_object_cache_clear __P((void));
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void vm_object_cache_trim __P((void));
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boolean_t vm_object_coalesce __P((vm_object_t, vm_object_t,
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vm_offset_t, vm_offset_t, vm_offset_t, vm_size_t));
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void vm_object_collapse __P((vm_object_t));
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void vm_object_copy __P((vm_object_t, vm_offset_t, vm_size_t,
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vm_object_t *, vm_offset_t *, boolean_t *));
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void vm_object_deactivate_pages __P((vm_object_t));
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void vm_object_deallocate __P((vm_object_t));
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void vm_object_enter __P((vm_object_t, vm_pager_t));
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void vm_object_init __P((vm_size_t));
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vm_object_t vm_object_lookup __P((vm_pager_t));
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boolean_t vm_object_page_clean __P((vm_object_t,
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vm_offset_t, vm_offset_t, boolean_t, boolean_t));
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void vm_object_page_remove __P((vm_object_t,
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vm_offset_t, vm_offset_t));
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void vm_object_pmap_copy __P((vm_object_t,
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vm_offset_t, vm_offset_t));
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void vm_object_pmap_remove __P((vm_object_t,
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vm_offset_t, vm_offset_t));
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void vm_object_prefer __P((vm_object_t,
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vm_offset_t, vm_offset_t *));
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void vm_object_print __P((vm_object_t, boolean_t));
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void _vm_object_print __P((vm_object_t, boolean_t,
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void (*)(const char *, ...)));
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void vm_object_reference __P((vm_object_t));
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void vm_object_remove __P((vm_pager_t));
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void vm_object_setpager __P((vm_object_t,
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vm_pager_t, vm_offset_t, boolean_t));
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void vm_object_shadow __P((vm_object_t *,
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vm_offset_t *, vm_size_t));
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#endif
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#endif /* _VM_OBJECT_ */
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