/* * 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. * * $FreeBSD$ */ /* * Virtual memory object module definitions. */ #ifndef _VM_OBJECT_ #define _VM_OBJECT_ #include <sys/queue.h> enum obj_type { OBJT_DEFAULT, OBJT_SWAP, OBJT_VNODE, OBJT_DEVICE, OBJT_PHYS, OBJT_DEAD }; typedef u_char objtype_t; /* * Types defined: * * vm_object_t Virtual memory object. * */ struct vm_object { TAILQ_ENTRY(vm_object) object_list; /* list of all 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 */ int generation; /* generation ID */ vm_size_t size; /* Object size */ int ref_count; /* How many refs?? */ int shadow_count; /* how many objects that this is a shadow for */ int hash_rand; /* vm hash table randomizer */ objtype_t type; /* type of pager */ u_short flags; /* see below */ u_short pg_color; /* color of first page in obj */ u_short paging_in_progress; /* Paging (in or out) so don't collapse or destroy */ int resident_page_count; /* number of resident pages */ struct vm_object *backing_object; /* object that I'm a shadow of */ vm_ooffset_t backing_object_offset;/* Offset in backing object */ TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */ void *handle; union { /* * VNode pager * * vnp_size - current size of file */ struct { off_t vnp_size; } vnp; /* * Device pager * * devp_pglist - list of allocated pages */ struct { TAILQ_HEAD(, vm_page) devp_pglist; } devp; /* * Swap pager * * swp_bcount - number of swap 'swblock' metablocks, each * contains up to 16 swapblk assignments. * see vm/swap_pager.h */ struct { int swp_bcount; } swp; } un_pager; }; /* * Flags */ #define OBJ_ACTIVE 0x0004 /* active objects */ #define OBJ_DEAD 0x0008 /* dead objects (during rundown) */ #define OBJ_NOSPLIT 0x0010 /* dont split this object */ #define OBJ_PIPWNT 0x0040 /* paging in progress wanted */ #define OBJ_WRITEABLE 0x0080 /* object has been made writable */ #define OBJ_MIGHTBEDIRTY 0x0100 /* object might be dirty */ #define OBJ_CLEANING 0x0200 #define OBJ_OPT 0x1000 /* I/O optimization */ #define OBJ_ONEMAPPING 0x2000 /* One USE (a single, non-forked) mapping flag */ #define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT) #define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT)) #ifdef _KERNEL #define OBJPC_SYNC 0x1 /* sync I/O */ #define OBJPC_INVAL 0x2 /* invalidate */ #define OBJPC_NOSYNC 0x4 /* skip if PG_NOSYNC */ TAILQ_HEAD(object_q, vm_object); extern struct object_q vm_object_list; /* list of allocated objects */ extern vm_object_t kernel_object; /* the single kernel object */ extern vm_object_t kmem_object; #endif /* _KERNEL */ #ifdef _KERNEL void vm_object_set_flag(vm_object_t object, u_short bits); void vm_object_clear_flag(vm_object_t object, u_short bits); void vm_object_pip_add(vm_object_t object, short i); void vm_object_pip_subtract(vm_object_t object, short i); void vm_object_pip_wakeup(vm_object_t object); void vm_object_pip_wakeupn(vm_object_t object, short i); void vm_object_pip_sleep(vm_object_t object, char *waitid); void vm_object_pip_wait(vm_object_t object, char *waitid); vm_object_t vm_object_allocate (objtype_t, vm_size_t); void _vm_object_allocate (objtype_t, vm_size_t, vm_object_t); boolean_t vm_object_coalesce (vm_object_t, vm_pindex_t, vm_size_t, vm_size_t); void vm_object_collapse (vm_object_t); void vm_object_deallocate (vm_object_t); void vm_object_terminate (vm_object_t); void vm_object_vndeallocate (vm_object_t); void vm_object_set_writeable_dirty (vm_object_t); void vm_object_init (void); void vm_object_page_clean (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t); void vm_object_page_remove (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t); void vm_object_pmap_copy (vm_object_t, vm_pindex_t, vm_pindex_t); void vm_object_pmap_copy_1 (vm_object_t, vm_pindex_t, vm_pindex_t); void vm_object_pmap_remove (vm_object_t, vm_pindex_t, vm_pindex_t); void vm_object_reference (vm_object_t); void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t); void vm_object_madvise (vm_object_t, vm_pindex_t, int, int); void vm_object_init2 (void); #endif /* _KERNEL */ #endif /* _VM_OBJECT_ */