217 lines
7.6 KiB
C
217 lines
7.6 KiB
C
/*
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* Copyright (c) 1991 Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)vm_map.h 7.3 (Berkeley) 4/21/91
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* PATCHES MAGIC LEVEL PATCH THAT GOT US HERE
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* -------------------- ----- ----------------------
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* CURRENT PATCH LEVEL: 1 00002
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* -------------------- ----- ----------------------
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*
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* 15 Aug 92 William Jolitz Prevent running out of map entries...
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*/
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#ifndef _VM_VM_MAP_H_
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#define _VM_VM_MAP_H_
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/*
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* Virtual memory map module definitions.
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*/
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/*
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* Types defined:
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*
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* vm_map_t the high-level address map data structure.
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* vm_map_entry_t an entry in an address map.
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* vm_map_version_t a timestamp of a map, for use with vm_map_lookup
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*/
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/*
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* Objects which live in maps may be either VM objects, or
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* another map (called a "sharing map") which denotes read-write
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* sharing with other maps.
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*/
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union vm_map_object {
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struct vm_object *vm_object; /* object object */
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struct vm_map *share_map; /* share map */
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struct vm_map *sub_map; /* belongs to another map */
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};
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typedef union vm_map_object vm_map_object_t;
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/*
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* Address map entries consist of start and end addresses,
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* a VM object (or sharing map) and offset into that object,
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* and user-exported inheritance and protection information.
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* Also included is control information for virtual copy operations.
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*/
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struct vm_map_entry {
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struct vm_map_entry *prev; /* previous entry */
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struct vm_map_entry *next; /* next entry */
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vm_offset_t start; /* start address */
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vm_offset_t end; /* end address */
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union vm_map_object object; /* object I point to */
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vm_offset_t offset; /* offset into object */
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boolean_t is_a_map; /* Is "object" a map? */
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boolean_t is_sub_map; /* Is "object" a submap? */
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/* Only in sharing maps: */
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boolean_t copy_on_write; /* is data copy-on-write */
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boolean_t needs_copy; /* does object need to be copied */
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/* Only in task maps: */
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vm_prot_t protection; /* protection code */
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vm_prot_t max_protection; /* maximum protection */
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vm_inherit_t inheritance; /* inheritance */
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int wired_count; /* can be paged if = 0 */
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};
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typedef struct vm_map_entry *vm_map_entry_t;
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/*
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* Maps are doubly-linked lists of map entries, kept sorted
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* by address. A single hint is provided to start
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* searches again from the last successful search,
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* insertion, or removal.
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*/
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struct vm_map {
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struct pmap * pmap; /* Physical map */
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lock_data_t lock; /* Lock for map data */
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struct vm_map_entry header; /* List of entries */
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int nentries; /* Number of entries */
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vm_size_t size; /* virtual size */
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boolean_t is_main_map; /* Am I a main map? */
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int ref_count; /* Reference count */
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simple_lock_data_t ref_lock; /* Lock for ref_count field */
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vm_map_entry_t hint; /* hint for quick lookups */
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simple_lock_data_t hint_lock; /* lock for hint storage */
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vm_map_entry_t first_free; /* First free space hint */
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boolean_t entries_pageable; /* map entries pageable?? */
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unsigned int timestamp; /* Version number */
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#define min_offset header.start
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#define max_offset header.end
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};
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typedef struct vm_map *vm_map_t;
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/*
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* Map versions are used to validate a previous lookup attempt.
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*
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* Since lookup operations may involve both a main map and
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* a sharing map, it is necessary to have a timestamp from each.
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* [If the main map timestamp has changed, the share_map and
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* associated timestamp are no longer valid; the map version
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* does not include a reference for the imbedded share_map.]
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*/
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typedef struct {
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int main_timestamp;
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vm_map_t share_map;
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int share_timestamp;
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} vm_map_version_t;
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/*
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* Macros: vm_map_lock, etc.
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* Function:
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* Perform locking on the data portion of a map.
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*/
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#define vm_map_lock(map) { lock_write(&(map)->lock); (map)->timestamp++; }
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#define vm_map_unlock(map) lock_write_done(&(map)->lock)
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#define vm_map_lock_read(map) lock_read(&(map)->lock)
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#define vm_map_unlock_read(map) lock_read_done(&(map)->lock)
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/*
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* Exported procedures that operate on vm_map_t.
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*/
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void vm_map_init();
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vm_map_t vm_map_create();
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void vm_map_deallocate();
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void vm_map_reference();
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int vm_map_find();
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int vm_map_remove();
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int vm_map_lookup();
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void vm_map_lookup_done();
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int vm_map_protect();
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int vm_map_inherit();
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int vm_map_copy();
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void vm_map_print();
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void vm_map_copy_entry();
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boolean_t vm_map_verify();
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void vm_map_verify_done();
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/*
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* Functions implemented as macros
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*/
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#define vm_map_min(map) ((map)->min_offset)
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#define vm_map_max(map) ((map)->max_offset)
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#define vm_map_pmap(map) ((map)->pmap)
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/* XXX: number of kernel maps and entries to statically allocate */
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#define MAX_KMAP 10
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#ifdef OMIT
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#define MAX_KMAPENT 500
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#else /* !OMIT*/
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#define MAX_KMAPENT 1000 /* 15 Aug 92*/
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#endif /* !OMIT*/
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#endif /* !_VM_VM_MAP_H_ */
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