/* * Copyright (c) 1991, 1993 * The 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 8.3 (Berkeley) 1/12/94 * * * 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. * * $Id: vm_object.h,v 1.19 1995/07/13 08:48:36 davidg Exp $ */ /* * Virtual memory object module definitions. */ #ifndef _VM_OBJECT_ #define _VM_OBJECT_ #ifdef KERNEL #include /* XXX for wakeup() */ #endif enum obj_type { OBJT_DEFAULT, OBJT_SWAP, OBJT_VNODE, OBJT_DEVICE }; typedef enum obj_type objtype_t; /* * Types defined: * * vm_object_t Virtual memory object. */ struct vm_object { TAILQ_ENTRY(vm_object) object_list; /* list of all objects */ TAILQ_ENTRY(vm_object) cached_list; /* list of cached (persistent) objects */ TAILQ_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */ TAILQ_ENTRY(vm_object) shadow_list; /* chain of shadow objects */ TAILQ_HEAD(, vm_page) memq; /* list of resident pages */ objtype_t type; /* type of pager */ vm_size_t size; /* Object size */ int ref_count; /* How many refs?? */ u_short flags; /* see below */ u_short paging_in_progress; /* Paging (in or out) so don't collapse or destroy */ int resident_page_count; /* number of resident pages */ vm_offset_t paging_offset; /* Offset into paging space */ struct vm_object *backing_object; /* object that I'm a shadow of */ vm_offset_t backing_object_offset;/* Offset in backing object */ vm_offset_t last_read; /* last read in object -- detect seq behavior */ TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */ void *handle; union { struct { vm_size_t vnp_size; /* Current size of file */ } vnp; struct { TAILQ_HEAD(, vm_page) devp_pglist; /* list of pages allocated */ } devp; struct { int swp_nblocks; int swp_allocsize; struct swblock *swp_blocks; short swp_poip; } swp; } un_pager; }; /* * Flags */ #define OBJ_CANPERSIST 0x0001 /* allow to persist */ #define OBJ_ACTIVE 0x0004 /* active objects */ #define OBJ_DEAD 0x0008 /* dead objects (during rundown) */ #define OBJ_PIPWNT 0x0040 /* paging in progress wanted */ #define OBJ_WRITEABLE 0x0080 /* object has been made writable */ #ifdef KERNEL extern int vm_object_cache_max; TAILQ_HEAD(object_q, vm_object); struct object_q vm_object_cached_list; /* list of objects persisting */ int vm_object_cached; /* size of cached list */ struct object_q vm_object_list; /* list of allocated objects */ long vm_object_count; /* count of all objects */ /* lock for object list and count */ vm_object_t kernel_object; /* the single kernel object */ vm_object_t kmem_object; #endif /* KERNEL */ #ifdef KERNEL static __inline void vm_object_pip_wakeup(vm_object_t object) { object->paging_in_progress--; if ((object->flags & OBJ_PIPWNT) && object->paging_in_progress == 0) { object->flags &= ~OBJ_PIPWNT; wakeup(object); } } vm_object_t vm_object_allocate __P((objtype_t, vm_size_t)); void vm_object_cache_clear __P((void)); void vm_object_cache_trim __P((void)); boolean_t vm_object_coalesce __P((vm_object_t, vm_object_t, vm_offset_t, vm_offset_t, vm_offset_t, vm_size_t)); void vm_object_collapse __P((vm_object_t)); void vm_object_copy __P((vm_object_t, vm_offset_t, vm_size_t, vm_object_t *, vm_offset_t *, boolean_t *)); void vm_object_deactivate_pages __P((vm_object_t)); void vm_object_deallocate __P((vm_object_t)); void vm_object_init __P((vm_size_t)); void vm_object_page_clean __P((vm_object_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t)); void vm_object_page_remove __P((vm_object_t, vm_offset_t, vm_offset_t, boolean_t)); void vm_object_pmap_copy __P((vm_object_t, vm_offset_t, vm_offset_t)); void vm_object_pmap_remove __P((vm_object_t, vm_offset_t, vm_offset_t)); void vm_object_print __P((vm_object_t, boolean_t)); void vm_object_reference __P((vm_object_t)); void vm_object_shadow __P((vm_object_t *, vm_offset_t *, vm_size_t)); void vm_object_terminate __P((vm_object_t)); #endif /* KERNEL */ #endif /* _VM_OBJECT_ */