uvm_object.h revision 1.14 
1/*	$OpenBSD: uvm_object.h,v 1.14 2009/06/17 00:13:59 oga Exp $	*/
2/*	$NetBSD: uvm_object.h,v 1.11 2001/03/09 01:02:12 chs Exp $	*/
3
4/*
5 *
6 * Copyright (c) 1997 Charles D. Cranor and Washington University.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *      This product includes software developed by Charles D. Cranor and
20 *      Washington University.
21 * 4. The name of the author may not be used to endorse or promote products
22 *    derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 * from: Id: uvm_object.h,v 1.1.2.2 1998/01/04 22:44:51 chuck Exp
36 */
37
38#ifndef _UVM_UVM_OBJECT_H_
39#define _UVM_UVM_OBJECT_H_
40
41/*
42 * uvm_object.h
43 */
44
45/*
46 * uvm_object: all that is left of mach objects.
47 */
48
49struct uvm_object {
50	simple_lock_data_t	vmobjlock;	/* lock on memq */
51	struct uvm_pagerops	*pgops;		/* pager ops */
52	struct pglist		memq;		/* pages in this object */
53	int			uo_npages;	/* # of pages in memq */
54	int			uo_refs;	/* reference count */
55};
56
57/*
58 * UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the
59 * object is a kernel memory object rather than a normal one (kernel
60 * memory objects don't have reference counts -- they never die).
61 *
62 * this value is used to detected kernel object mappings at uvm_unmap()
63 * time.   normally when an object is unmapped its pages eventaully become
64 * deactivated and then paged out and/or freed.    this is not useful
65 * for kernel objects... when a kernel object is unmapped we always want
66 * to free the resources associated with the mapping.   UVM_OBJ_KERN
67 * allows us to decide which type of unmapping we want to do.
68 *
69 * in addition, we have kernel objects which may be used in an
70 * interrupt context.  these objects get their mappings entered
71 * with pmap_kenter*() and removed with pmap_kremove(), which
72 * are safe to call in interrupt context, and must be used ONLY
73 * for wired kernel mappings in these objects and their associated
74 * maps.
75 */
76#define UVM_OBJ_KERN		(-2)
77
78#define	UVM_OBJ_IS_KERN_OBJECT(uobj)					\
79	((uobj)->uo_refs == UVM_OBJ_KERN)
80
81#ifdef _KERNEL
82
83extern struct uvm_pagerops uvm_vnodeops;
84extern struct uvm_pagerops uvm_deviceops;
85
86#define	UVM_OBJ_IS_VNODE(uobj)						\
87	((uobj)->pgops == &uvm_vnodeops)
88
89#define UVM_OBJ_IS_DEVICE(uobj)						\
90	((uobj)->pgops == &uvm_deviceops)
91
92#define	UVM_OBJ_IS_VTEXT(uobj)						\
93	((uobj)->pgops == &uvm_vnodeops &&				\
94	 ((struct vnode *)uobj)->v_flag & VTEXT)
95
96
97#endif /* _KERNEL */
98
99#endif /* _UVM_UVM_OBJECT_H_ */
100