usr/src/sys/vm/vm_object.h

/*
 * 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.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)vm_object.h 7.4 (Berkeley) %G%
 *
 *
 * 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 */
        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                     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 */
        vm_offset_t             paging_offset;  /* Offset into paging space */
        struct vm_object        *shadow;        /* My shadow */
        vm_offset_t             shadow_offset;  /* Offset in shadow */
        queue_chain_t           cached_list;    /* for persistence */
};
/*
 * Flags
 */
#define OBJ_CANPERSIST  0x0001  /* allow to persist */
#define OBJ_INTERNAL    0x0002  /* internally created object */
#define OBJ_ACTIVE      0x0004  /* used to mark active objects */

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_