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/* $OpenBSD: vm_map.h,v 1.5 1997/10/06 20:21:21 deraadt Exp $ */
/* $NetBSD: vm_map.h,v 1.11 1995/03/26 20:39:10 jtc Exp $ */
/*
* 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.
*
* @(#)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.
*/
/*
* 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; /* Is "object" a map? */
boolean_t is_sub_map; /* Is "object" a submap? */
/* Only in sharing maps: */
boolean_t copy_on_write; /* is data copy-on-write */
boolean_t needs_copy; /* 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 500
#ifdef _KERNEL
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));
void _vm_map_print __P((vm_map_t, boolean_t,
int (*)(const char *, ...)));
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_ */
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