013818111a
a device pager (OBJT_DEVICE) object in that it uses fictitious pages to provide aliases to other memory addresses. The primary difference is that it uses an sglist(9) to determine the physical addresses for a given offset into the object instead of invoking the d_mmap() method in a device driver. Reviewed by: alc Approved by: re (kensmith) MFC after: 2 weeks
235 lines
8.1 KiB
C
235 lines
8.1 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.
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Virtual memory object module definitions.
|
|
*/
|
|
|
|
#ifndef _VM_OBJECT_
|
|
#define _VM_OBJECT_
|
|
|
|
#include <sys/queue.h>
|
|
#include <sys/_lock.h>
|
|
#include <sys/_mutex.h>
|
|
|
|
/*
|
|
* Types defined:
|
|
*
|
|
* vm_object_t Virtual memory object.
|
|
*
|
|
* List of locks
|
|
* (c) const until freed
|
|
*
|
|
*/
|
|
|
|
struct vm_object {
|
|
struct mtx mtx;
|
|
TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
|
|
LIST_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */
|
|
LIST_ENTRY(vm_object) shadow_list; /* chain of shadow objects */
|
|
TAILQ_HEAD(, vm_page) memq; /* list of resident pages */
|
|
vm_page_t root; /* root of the resident page splay tree */
|
|
vm_pindex_t size; /* Object size */
|
|
int generation; /* generation ID */
|
|
int ref_count; /* How many refs?? */
|
|
int shadow_count; /* how many objects that this is a shadow for */
|
|
vm_memattr_t memattr; /* default memory attribute for pages */
|
|
objtype_t type; /* type of pager */
|
|
u_short flags; /* see below */
|
|
u_short pg_color; /* (c) color of first page in obj */
|
|
u_short paging_in_progress; /* Paging (in or out) so don't collapse or destroy */
|
|
int resident_page_count; /* number of resident pages */
|
|
struct vm_object *backing_object; /* object that I'm a shadow of */
|
|
vm_ooffset_t backing_object_offset;/* Offset in backing object */
|
|
TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */
|
|
LIST_HEAD(, vm_reserv) rvq; /* list of reservations */
|
|
vm_page_t cache; /* root of the cache page splay tree */
|
|
void *handle;
|
|
union {
|
|
/*
|
|
* VNode pager
|
|
*
|
|
* vnp_size - current size of file
|
|
*/
|
|
struct {
|
|
off_t vnp_size;
|
|
} vnp;
|
|
|
|
/*
|
|
* Device pager
|
|
*
|
|
* devp_pglist - list of allocated pages
|
|
*/
|
|
struct {
|
|
TAILQ_HEAD(, vm_page) devp_pglist;
|
|
} devp;
|
|
|
|
/*
|
|
* SG pager
|
|
*
|
|
* sgp_pglist - list of allocated pages
|
|
*/
|
|
struct {
|
|
TAILQ_HEAD(, vm_page) sgp_pglist;
|
|
} sgp;
|
|
|
|
/*
|
|
* Swap pager
|
|
*
|
|
* swp_bcount - number of swap 'swblock' metablocks, each
|
|
* contains up to 16 swapblk assignments.
|
|
* see vm/swap_pager.h
|
|
*/
|
|
struct {
|
|
int swp_bcount;
|
|
} swp;
|
|
} un_pager;
|
|
struct uidinfo *uip;
|
|
vm_ooffset_t charge;
|
|
};
|
|
|
|
/*
|
|
* Flags
|
|
*/
|
|
#define OBJ_ACTIVE 0x0004 /* active objects */
|
|
#define OBJ_DEAD 0x0008 /* dead objects (during rundown) */
|
|
#define OBJ_NOSPLIT 0x0010 /* dont split this object */
|
|
#define OBJ_PIPWNT 0x0040 /* paging in progress wanted */
|
|
#define OBJ_MIGHTBEDIRTY 0x0100 /* object might be dirty */
|
|
#define OBJ_CLEANING 0x0200
|
|
#define OBJ_COLORED 0x1000 /* pg_color is defined */
|
|
#define OBJ_ONEMAPPING 0x2000 /* One USE (a single, non-forked) mapping flag */
|
|
#define OBJ_DISCONNECTWNT 0x4000 /* disconnect from vnode wanted */
|
|
|
|
#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
|
|
|
|
#define OBJPC_SYNC 0x1 /* sync I/O */
|
|
#define OBJPC_INVAL 0x2 /* invalidate */
|
|
#define OBJPC_NOSYNC 0x4 /* skip if PG_NOSYNC */
|
|
|
|
TAILQ_HEAD(object_q, vm_object);
|
|
|
|
extern struct object_q vm_object_list; /* list of allocated objects */
|
|
extern struct mtx vm_object_list_mtx; /* lock for object list and count */
|
|
|
|
extern struct vm_object kernel_object_store;
|
|
extern struct vm_object kmem_object_store;
|
|
|
|
#define kernel_object (&kernel_object_store)
|
|
#define kmem_object (&kmem_object_store)
|
|
|
|
#define VM_OBJECT_LOCK(object) mtx_lock(&(object)->mtx)
|
|
#define VM_OBJECT_LOCK_ASSERT(object, type) \
|
|
mtx_assert(&(object)->mtx, (type))
|
|
#define VM_OBJECT_LOCK_INIT(object, type) \
|
|
mtx_init(&(object)->mtx, "vm object", \
|
|
(type), MTX_DEF | MTX_DUPOK)
|
|
#define VM_OBJECT_LOCKED(object) mtx_owned(&(object)->mtx)
|
|
#define VM_OBJECT_MTX(object) (&(object)->mtx)
|
|
#define VM_OBJECT_TRYLOCK(object) mtx_trylock(&(object)->mtx)
|
|
#define VM_OBJECT_UNLOCK(object) mtx_unlock(&(object)->mtx)
|
|
|
|
/*
|
|
* The object must be locked or thread private.
|
|
*/
|
|
static __inline void
|
|
vm_object_set_flag(vm_object_t object, u_short bits)
|
|
{
|
|
|
|
object->flags |= bits;
|
|
}
|
|
|
|
void vm_object_clear_flag(vm_object_t object, u_short bits);
|
|
void vm_object_pip_add(vm_object_t object, short i);
|
|
void vm_object_pip_subtract(vm_object_t object, short i);
|
|
void vm_object_pip_wakeup(vm_object_t object);
|
|
void vm_object_pip_wakeupn(vm_object_t object, short i);
|
|
void vm_object_pip_wait(vm_object_t object, char *waitid);
|
|
|
|
vm_object_t vm_object_allocate (objtype_t, vm_pindex_t);
|
|
void _vm_object_allocate (objtype_t, vm_pindex_t, vm_object_t);
|
|
boolean_t vm_object_coalesce(vm_object_t, vm_ooffset_t, vm_size_t, vm_size_t,
|
|
boolean_t);
|
|
void vm_object_collapse (vm_object_t);
|
|
void vm_object_deallocate (vm_object_t);
|
|
void vm_object_destroy (vm_object_t);
|
|
void vm_object_terminate (vm_object_t);
|
|
void vm_object_set_writeable_dirty (vm_object_t);
|
|
void vm_object_init (void);
|
|
void vm_object_page_clean (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
|
|
void vm_object_page_remove (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
|
|
boolean_t vm_object_populate(vm_object_t, vm_pindex_t, vm_pindex_t);
|
|
void vm_object_reference (vm_object_t);
|
|
void vm_object_reference_locked(vm_object_t);
|
|
int vm_object_set_memattr(vm_object_t object, vm_memattr_t memattr);
|
|
void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t);
|
|
void vm_object_split(vm_map_entry_t);
|
|
void vm_object_sync(vm_object_t, vm_ooffset_t, vm_size_t, boolean_t,
|
|
boolean_t);
|
|
void vm_object_madvise (vm_object_t, vm_pindex_t, int, int);
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* _VM_OBJECT_ */
|