xref: /minix/sys/uvm/uvm_pglist.h (revision 6c8f7fc3)
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  */
39 struct vm_page;
40 TAILQ_HEAD(pglist, vm_page);
41 LIST_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 
51 struct pgflbucket {
52 	struct pgflist pgfl_queues[PGFL_NQUEUES];
53 };
54 
55 struct pgfreelist {
56 	struct pgflbucket *pgfl_buckets;
57 };
58 
59 #endif /* _UVM_UVM_PGLIST_H_ */
60