1/* $NetBSD: uvm_pglist.h,v 1.8 2010/11/06 15:48:00 uebayasi Exp $ */
2
3/*-
4 * Copyright (c) 2000, 2001, 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _UVM_UVM_PGLIST_H_
33#define _UVM_UVM_PGLIST_H_
34
35/*
36 * This defines the type of a page queue, e.g. active list, inactive
37 * list, etc.
38 */
39struct vm_page;
40TAILQ_HEAD(pglist, vm_page);
41LIST_HEAD(pgflist, vm_page);
42
43/*
44 * A page free list consists of free pages of unknown contents and free
45 * pages of all zeros.
46 */
47#define PGFL_UNKNOWN 0
48#define PGFL_ZEROS 1
49#define PGFL_NQUEUES 2
50
51struct pgflbucket {
52 struct pgflist pgfl_queues[PGFL_NQUEUES];
53};
54
55struct pgfreelist {
56 struct pgflbucket *pgfl_buckets;
57};
58
59#endif /* _UVM_UVM_PGLIST_H_ */
60