/* * 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_map.h 8.3 (Berkeley) 3/15/94 * * * 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_map.h,v 1.4 1995/01/09 16:05:46 davidg Exp $ */ /* * Virtual memory map module definitions. */ #ifndef _VM_MAP_ #define _VM_MAP_ /* * Types defined: * * vm_map_t the high-level address map data structure. * vm_map_entry_t an entry in an address map. * vm_map_version_t a timestamp of a map, for use with vm_map_lookup */ /* * Objects which live in maps may be either VM objects, or * another map (called a "sharing map") which denotes read-write * sharing with other maps. */ union vm_map_object { struct vm_object *vm_object; /* object object */ struct vm_map *share_map; /* share map */ struct vm_map *sub_map; /* belongs to another map */ }; /* * Address map entries consist of start and end addresses, * a VM object (or sharing map) and offset into that object, * and user-exported inheritance and protection information. * Also included is control information for virtual copy operations. */ struct vm_map_entry { struct vm_map_entry *prev; /* previous entry */ struct vm_map_entry *next; /* next entry */ vm_offset_t start; /* start address */ vm_offset_t end; /* end address */ union vm_map_object object; /* object I point to */ vm_offset_t offset; /* offset into object */ boolean_t is_a_map:1, /* Is "object" a map? */ is_sub_map:1, /* Is "object" a submap? */ /* Only in sharing maps: */ copy_on_write:1, /* is data copy-on-write */ needs_copy:1; /* does object need to be copied */ /* Only in task maps: */ vm_prot_t protection; /* protection code */ vm_prot_t max_protection; /* maximum protection */ vm_inherit_t inheritance; /* inheritance */ int wired_count; /* can be paged if = 0 */ }; /* * Maps are doubly-linked lists of map entries, kept sorted * by address. A single hint is provided to start * searches again from the last successful search, * insertion, or removal. */ struct vm_map { struct pmap *pmap; /* Physical map */ lock_data_t lock; /* Lock for map data */ struct vm_map_entry header; /* List of entries */ int nentries; /* Number of entries */ vm_size_t size; /* virtual size */ boolean_t is_main_map; /* Am I a main map? */ int ref_count; /* Reference count */ simple_lock_data_t ref_lock; /* Lock for ref_count field */ vm_map_entry_t hint; /* hint for quick lookups */ simple_lock_data_t hint_lock; /* lock for hint storage */ vm_map_entry_t first_free; /* First free space hint */ boolean_t entries_pageable; /* map entries pageable?? */ unsigned int timestamp; /* Version number */ #define min_offset header.start #define max_offset header.end }; /* * Map versions are used to validate a previous lookup attempt. * * Since lookup operations may involve both a main map and * a sharing map, it is necessary to have a timestamp from each. * [If the main map timestamp has changed, the share_map and * associated timestamp are no longer valid; the map version * does not include a reference for the imbedded share_map.] */ typedef struct { int main_timestamp; vm_map_t share_map; int share_timestamp; } vm_map_version_t; /* * Macros: vm_map_lock, etc. * Function: * Perform locking on the data portion of a map. */ #define vm_map_lock(map) { \ lock_write(&(map)->lock); \ (map)->timestamp++; \ } #define vm_map_unlock(map) lock_write_done(&(map)->lock) #define vm_map_lock_read(map) lock_read(&(map)->lock) #define vm_map_unlock_read(map) lock_read_done(&(map)->lock) /* * Functions implemented as macros */ #define vm_map_min(map) ((map)->min_offset) #define vm_map_max(map) ((map)->max_offset) #define vm_map_pmap(map) ((map)->pmap) /* XXX: number of kernel maps and entries to statically allocate */ #define MAX_KMAP 10 #define MAX_KMAPENT 128 #ifdef KERNEL extern vm_offset_t kentry_data; extern vm_size_t kentry_data_size; boolean_t vm_map_check_protection __P((vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t)); int vm_map_copy __P((vm_map_t, vm_map_t, vm_offset_t, vm_size_t, vm_offset_t, boolean_t, boolean_t)); void vm_map_copy_entry __P((vm_map_t, vm_map_t, vm_map_entry_t, vm_map_entry_t)); struct pmap; vm_map_t vm_map_create __P((struct pmap *, vm_offset_t, vm_offset_t, boolean_t)); void vm_map_deallocate __P((vm_map_t)); int vm_map_delete __P((vm_map_t, vm_offset_t, vm_offset_t)); vm_map_entry_t vm_map_entry_create __P((vm_map_t)); void vm_map_entry_delete __P((vm_map_t, vm_map_entry_t)); void vm_map_entry_dispose __P((vm_map_t, vm_map_entry_t)); void vm_map_entry_unwire __P((vm_map_t, vm_map_entry_t)); int vm_map_find __P((vm_map_t, vm_object_t, vm_offset_t, vm_offset_t *, vm_size_t, boolean_t)); int vm_map_findspace __P((vm_map_t, vm_offset_t, vm_size_t, vm_offset_t *)); int vm_map_inherit __P((vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t)); void vm_map_init __P((struct vm_map *, vm_offset_t, vm_offset_t, boolean_t)); int vm_map_insert __P((vm_map_t, vm_object_t, vm_offset_t, vm_offset_t, vm_offset_t)); int vm_map_lookup __P((vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *, vm_offset_t *, vm_prot_t *, boolean_t *, boolean_t *)); void vm_map_lookup_done __P((vm_map_t, vm_map_entry_t)); boolean_t vm_map_lookup_entry __P((vm_map_t, vm_offset_t, vm_map_entry_t *)); int vm_map_pageable __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t)); int vm_map_clean __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t)); void vm_map_print __P((vm_map_t, boolean_t)); int vm_map_protect __P((vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t)); void vm_map_reference __P((vm_map_t)); int vm_map_remove __P((vm_map_t, vm_offset_t, vm_offset_t)); void vm_map_simplify __P((vm_map_t, vm_offset_t)); void vm_map_simplify_entry __P((vm_map_t, vm_map_entry_t)); void vm_map_startup __P((void)); int vm_map_submap __P((vm_map_t, vm_offset_t, vm_offset_t, vm_map_t)); #endif #endif /* _VM_MAP_ */