264 lines
9.9 KiB
C
264 lines
9.9 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* 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_ooffset_t offset; /* offset into object */
|
|
u_char eflags; /* map entry flags */
|
|
#if 0
|
|
u_char is_a_map:1, /* Is "object" a map? */
|
|
is_sub_map:1, /* Is "object" a submap? */
|
|
copy_on_write:1, /* is data copy-on-write */
|
|
needs_copy:1, /* does object need to be copied */
|
|
nofault:1, /* should never fault */
|
|
user_wired:1; /* wired by user */
|
|
#endif
|
|
/* 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 */
|
|
};
|
|
|
|
#define MAP_ENTRY_IS_A_MAP 0x1
|
|
#define MAP_ENTRY_IS_SUB_MAP 0x2
|
|
#define MAP_ENTRY_COW 0x4
|
|
#define MAP_ENTRY_NEEDS_COPY 0x8
|
|
#define MAP_ENTRY_NOFAULT 0x10
|
|
#define MAP_ENTRY_USER_WIRED 0x20
|
|
|
|
/*
|
|
* 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 */
|
|
vm_map_entry_t hint; /* hint for quick lookups */
|
|
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
|
|
};
|
|
|
|
/*
|
|
* Shareable process virtual address space.
|
|
* May eventually be merged with vm_map.
|
|
* Several fields are temporary (text, data stuff).
|
|
*/
|
|
struct vmspace {
|
|
struct vm_map vm_map; /* VM address map */
|
|
struct pmap vm_pmap; /* private physical map */
|
|
int vm_refcnt; /* number of references */
|
|
caddr_t vm_shm; /* SYS5 shared memory private data XXX */
|
|
vm_object_t vm_upages_obj; /* UPAGES object */
|
|
/* we copy from vm_startcopy to the end of the structure on fork */
|
|
#define vm_startcopy vm_rssize
|
|
segsz_t vm_rssize; /* current resident set size in pages */
|
|
segsz_t vm_swrss; /* resident set size before last swap */
|
|
segsz_t vm_tsize; /* text size (pages) XXX */
|
|
segsz_t vm_dsize; /* data size (pages) XXX */
|
|
segsz_t vm_ssize; /* stack size (pages) */
|
|
caddr_t vm_taddr; /* user virtual address of text XXX */
|
|
caddr_t vm_daddr; /* user virtual address of data XXX */
|
|
caddr_t vm_maxsaddr; /* user VA at max stack growth */
|
|
caddr_t vm_minsaddr; /* user VA at max stack growth */
|
|
};
|
|
|
|
|
|
/*
|
|
* 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 embedded 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
|
|
|
|
/*
|
|
* Copy-on-write flags for vm_map operations
|
|
*/
|
|
#define MAP_COPY_NEEDED 0x1
|
|
#define MAP_COPY_ON_WRITE 0x2
|
|
#define MAP_NOFAULT 0x4
|
|
|
|
/*
|
|
* vm_fault option flags
|
|
*/
|
|
#define VM_FAULT_NORMAL 0
|
|
#define VM_FAULT_CHANGE_WIRING 1
|
|
#define VM_FAULT_USER_WIRE 2
|
|
|
|
#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));
|
|
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));
|
|
int vm_map_find __P((vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, vm_size_t, boolean_t, vm_prot_t, vm_prot_t, int));
|
|
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_ooffset_t, vm_offset_t, vm_offset_t, vm_prot_t, vm_prot_t, int));
|
|
int vm_map_lookup __P((vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
|
|
vm_pindex_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_user_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));
|
|
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_startup __P((void));
|
|
int vm_map_submap __P((vm_map_t, vm_offset_t, vm_offset_t, vm_map_t));
|
|
void vm_map_madvise __P((vm_map_t, pmap_t, vm_offset_t, vm_offset_t, int));
|
|
void vm_map_simplify_entry __P((vm_map_t, vm_map_entry_t));
|
|
|
|
#endif
|
|
#endif /* _VM_MAP_ */
|