190 lines
7.3 KiB
C
190 lines
7.3 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_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.
|
|
*
|
|
* $Id$
|
|
*/
|
|
|
|
/*
|
|
* 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 };
|
|
typedef enum obj_type objtype_t;
|
|
|
|
/*
|
|
* Types defined:
|
|
*
|
|
* vm_object_t Virtual memory object.
|
|
*/
|
|
|
|
struct vm_object {
|
|
TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
|
|
TAILQ_ENTRY(vm_object) cached_list; /* list of cached (persistent) 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 */
|
|
objtype_t type; /* type of pager */
|
|
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 pg_color; /* color of first page in obj */
|
|
u_short flags; /* see below */
|
|
u_short paging_in_progress; /* Paging (in or out) so don't collapse or destroy */
|
|
u_short behavior; /* see below */
|
|
int resident_page_count; /* number of resident pages */
|
|
vm_ooffset_t paging_offset; /* Offset into paging space */
|
|
struct vm_object *backing_object; /* object that I'm a shadow of */
|
|
vm_ooffset_t backing_object_offset;/* Offset in backing object */
|
|
vm_offset_t last_read; /* last read in object -- detect seq behavior */
|
|
vm_page_t page_hint; /* hint for last looked-up or allocated page */
|
|
TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */
|
|
void *handle;
|
|
union {
|
|
struct {
|
|
off_t vnp_size; /* Current size of file */
|
|
} vnp;
|
|
struct {
|
|
TAILQ_HEAD(, vm_page) devp_pglist; /* list of pages allocated */
|
|
} devp;
|
|
struct {
|
|
int swp_nblocks;
|
|
int swp_allocsize;
|
|
struct swblock *swp_blocks;
|
|
short swp_poip;
|
|
} swp;
|
|
} un_pager;
|
|
};
|
|
|
|
/*
|
|
* Flags
|
|
*/
|
|
#define OBJ_CANPERSIST 0x0001 /* allow to persist */
|
|
#define OBJ_ACTIVE 0x0004 /* active objects */
|
|
#define OBJ_DEAD 0x0008 /* dead objects (during rundown) */
|
|
#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_VFS_REF 0x0400 /* object is refed by vfs layer */
|
|
|
|
|
|
#define OBJ_VNODE_GONE 0x0800 /* vnode is gone */
|
|
#define OBJ_NORMAL 0x0 /* default behavior */
|
|
#define OBJ_SEQUENTIAL 0x1 /* expect sequential accesses */
|
|
#define OBJ_RANDOM 0x2 /* expect random accesses */
|
|
|
|
#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
|
|
extern int vm_object_cache_max;
|
|
|
|
TAILQ_HEAD(object_q, vm_object);
|
|
|
|
extern struct object_q vm_object_cached_list; /* list of objects persisting */
|
|
extern int vm_object_cached; /* size of cached list */
|
|
|
|
extern struct object_q vm_object_list; /* list of allocated objects */
|
|
extern long vm_object_count; /* count of all objects */
|
|
|
|
/* lock for object list and count */
|
|
|
|
extern vm_object_t kernel_object; /* the single kernel object */
|
|
extern vm_object_t kmem_object;
|
|
|
|
#endif /* KERNEL */
|
|
|
|
#ifdef KERNEL
|
|
static __inline void
|
|
vm_object_pip_wakeup(vm_object_t object)
|
|
{
|
|
object->paging_in_progress--;
|
|
if ((object->flags & OBJ_PIPWNT) && object->paging_in_progress == 0) {
|
|
object->flags &= ~OBJ_PIPWNT;
|
|
wakeup(object);
|
|
}
|
|
}
|
|
|
|
vm_object_t vm_object_allocate __P((objtype_t, vm_size_t));
|
|
void vm_object_cache_clear __P((void));
|
|
boolean_t vm_object_coalesce __P((vm_object_t, vm_pindex_t, vm_size_t, vm_size_t));
|
|
void vm_object_collapse __P((vm_object_t));
|
|
void vm_object_copy __P((vm_object_t, vm_pindex_t, vm_object_t *, vm_pindex_t *, boolean_t *));
|
|
void vm_object_deallocate __P((vm_object_t));
|
|
void vm_object_init __P((void));
|
|
void vm_object_page_clean __P((vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t, boolean_t));
|
|
void vm_object_page_remove __P((vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t));
|
|
void vm_object_pmap_copy __P((vm_object_t, vm_pindex_t, vm_pindex_t));
|
|
void vm_object_pmap_remove __P((vm_object_t, vm_pindex_t, vm_pindex_t));
|
|
void vm_object_reference __P((vm_object_t));
|
|
void vm_object_shadow __P((vm_object_t *, vm_ooffset_t *, vm_size_t));
|
|
void vm_object_madvise __P((vm_object_t, vm_pindex_t, int, int));
|
|
#endif /* KERNEL */
|
|
|
|
#endif /* _VM_OBJECT_ */
|