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Annotation of Net2/vm/vm_object.h, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Copyright (c) 1991 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * The Mach Operating System project at Carnegie-Mellon University.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by the University of
        !            19:  *     California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  *     @(#)vm_object.h 7.3 (Berkeley) 4/21/91
        !            37:  *
        !            38:  *
        !            39:  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
        !            40:  * All rights reserved.
        !            41:  *
        !            42:  * Authors: Avadis Tevanian, Jr., Michael Wayne Young
        !            43:  * 
        !            44:  * Permission to use, copy, modify and distribute this software and
        !            45:  * its documentation is hereby granted, provided that both the copyright
        !            46:  * notice and this permission notice appear in all copies of the
        !            47:  * software, derivative works or modified versions, and any portions
        !            48:  * thereof, and that both notices appear in supporting documentation.
        !            49:  * 
        !            50:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 
        !            51:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 
        !            52:  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            53:  * 
        !            54:  * Carnegie Mellon requests users of this software to return to
        !            55:  *
        !            56:  *  Software Distribution Coordinator  or  [email protected]
        !            57:  *  School of Computer Science
        !            58:  *  Carnegie Mellon University
        !            59:  *  Pittsburgh PA 15213-3890
        !            60:  *
        !            61:  * any improvements or extensions that they make and grant Carnegie the
        !            62:  * rights to redistribute these changes.
        !            63:  */
        !            64: 
        !            65: /*
        !            66:  *     Virtual memory object module definitions.
        !            67:  */
        !            68: 
        !            69: #ifndef        _VM_OBJECT_
        !            70: #define        _VM_OBJECT_
        !            71: 
        !            72: #include <vm/vm_pager.h>
        !            73: 
        !            74: /*
        !            75:  *     Types defined:
        !            76:  *
        !            77:  *     vm_object_t             Virtual memory object.
        !            78:  */
        !            79: 
        !            80: struct vm_object {
        !            81:        queue_chain_t           memq;           /* Resident memory */
        !            82:        queue_chain_t           object_list;    /* list of all objects */
        !            83:        simple_lock_data_t      Lock;           /* Synchronization */
        !            84:        int                     LockHolder;
        !            85:        int                     ref_count;      /* How many refs?? */
        !            86:        vm_size_t               size;           /* Object size */
        !            87:        int                     resident_page_count;
        !            88:                                                /* number of resident pages */
        !            89:        struct vm_object        *copy;          /* Object that holds copies of
        !            90:                                                   my changed pages */
        !            91:        vm_pager_t              pager;          /* Where to get data */
        !            92:        boolean_t               pager_ready;    /* Have pager fields been filled? */
        !            93:        vm_offset_t             paging_offset;  /* Offset into paging space */
        !            94:        struct vm_object        *shadow;        /* My shadow */
        !            95:        vm_offset_t             shadow_offset;  /* Offset in shadow */
        !            96:        unsigned int
        !            97:                                paging_in_progress:16,
        !            98:                                                /* Paging (in or out) - don't
        !            99:                                                   collapse or destroy */
        !           100:        /* boolean_t */         can_persist:1,  /* allow to persist */
        !           101:        /* boolean_t */         internal:1;     /* internally created object */
        !           102:        queue_chain_t           cached_list;    /* for persistence */
        !           103: };
        !           104: 
        !           105: typedef struct vm_object       *vm_object_t;
        !           106: 
        !           107: struct vm_object_hash_entry {
        !           108:        queue_chain_t           hash_links;     /* hash chain links */
        !           109:        vm_object_t             object;         /* object we represent */
        !           110: };
        !           111: 
        !           112: typedef struct vm_object_hash_entry    *vm_object_hash_entry_t;
        !           113: 
        !           114: #ifdef KERNEL
        !           115: queue_head_t   vm_object_cached_list;  /* list of objects persisting */
        !           116: int            vm_object_cached;       /* size of cached list */
        !           117: simple_lock_data_t     vm_cache_lock;  /* lock for object cache */
        !           118: 
        !           119: queue_head_t   vm_object_list;         /* list of allocated objects */
        !           120: long           vm_object_count;        /* count of all objects */
        !           121: simple_lock_data_t     vm_object_list_lock;
        !           122:                                        /* lock for object list and count */
        !           123: 
        !           124: vm_object_t    kernel_object;          /* the single kernel object */
        !           125: vm_object_t    kmem_object;
        !           126: 
        !           127: #define        vm_object_cache_lock()          simple_lock(&vm_cache_lock)
        !           128: #define        vm_object_cache_unlock()        simple_unlock(&vm_cache_lock)
        !           129: #endif KERNEL
        !           130: 
        !           131: /*
        !           132:  *     Declare procedures that operate on VM objects.
        !           133:  */
        !           134: 
        !           135: void           vm_object_init ();
        !           136: void           vm_object_terminate();
        !           137: vm_object_t    vm_object_allocate();
        !           138: void           vm_object_reference();
        !           139: void           vm_object_deallocate();
        !           140: void           vm_object_pmap_copy();
        !           141: void           vm_object_pmap_remove();
        !           142: void           vm_object_page_remove();
        !           143: void           vm_object_shadow();
        !           144: void           vm_object_copy();
        !           145: void           vm_object_collapse();
        !           146: vm_object_t    vm_object_lookup();
        !           147: void           vm_object_enter();
        !           148: void           vm_object_setpager();
        !           149: #define                vm_object_cache(pager)          pager_cache(vm_object_lookup(pager),TRUE)
        !           150: #define                vm_object_uncache(pager)        pager_cache(vm_object_lookup(pager),FALSE)
        !           151: 
        !           152: void           vm_object_cache_clear();
        !           153: void           vm_object_print();
        !           154: 
        !           155: #if    VM_OBJECT_DEBUG
        !           156: #define        vm_object_lock_init(object)     { simple_lock_init(&(object)->Lock); (object)->LockHolder = 0; }
        !           157: #define        vm_object_lock(object)          { simple_lock(&(object)->Lock); (object)->LockHolder = (int) current_thread(); }
        !           158: #define        vm_object_unlock(object)        { (object)->LockHolder = 0; simple_unlock(&(object)->Lock); }
        !           159: #define        vm_object_lock_try(object)      (simple_lock_try(&(object)->Lock) ? ( ((object)->LockHolder = (int) current_thread()) , TRUE) : FALSE)
        !           160: #define        vm_object_sleep(event, object, interruptible) \
        !           161:                                        { (object)->LockHolder = 0; thread_sleep((event), &(object)->Lock, (interruptible)); }
        !           162: #else  VM_OBJECT_DEBUG
        !           163: #define        vm_object_lock_init(object)     simple_lock_init(&(object)->Lock)
        !           164: #define        vm_object_lock(object)          simple_lock(&(object)->Lock)
        !           165: #define        vm_object_unlock(object)        simple_unlock(&(object)->Lock)
        !           166: #define        vm_object_lock_try(object)      simple_lock_try(&(object)->Lock)
        !           167: #define        vm_object_sleep(event, object, interruptible) \
        !           168:                                        thread_sleep((event), &(object)->Lock, (interruptible))
        !           169: #endif VM_OBJECT_DEBUG
        !           170: 
        !           171: #endif _VM_OBJECT_

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