1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/* $NetBSD: uvm_object.h,v 1.5 1998/03/09 00:58:58 mrg Exp $ */
/*
*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
* All rights reserved.
*
* 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 Charles D. Cranor and
* Washington University.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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: Id: uvm_object.h,v 1.1.2.2 1998/01/04 22:44:51 chuck Exp
*/
#ifndef _UVM_UVM_OBJECT_H_
#define _UVM_UVM_OBJECT_H_
/*
* uvm_object.h
*/
/*
* uvm_object: all that is left of mach objects.
*/
struct uvm_object {
simple_lock_data_t vmobjlock; /* lock on memq */
struct uvm_pagerops *pgops; /* pager ops */
struct pglist memq; /* pages in this object */
int uo_npages; /* # of pages in memq */
int uo_refs; /* reference count */
};
/*
* UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the
* object is a kernel memory object rather than a normal one (kernel
* memory objects don't have reference counts -- they never die).
*
* this value is used to detected kernel object mappings at uvm_unmap()
* time. normally when an object is unmapped its pages eventaully become
* deactivated and then paged out and/or freed. this is not useful
* for kernel objects... when a kernel object is unmapped we always want
* to free the resources associated with the mapping. UVM_OBJ_KERN
* allows us to decide which type of unmapping we want to do.
*/
#define UVM_OBJ_KERN (-2)
#endif /* _UVM_UVM_OBJECT_H_ */
|
