1 /* $NetBSD: uvm_pglist.h,v 1.7 2008/06/04 12:45:28 ad 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 TAILQ_HEAD(pglist, vm_page); 40 LIST_HEAD(pgflist, vm_page); 41 42 /* 43 * A page free list consists of free pages of unknown contents and free 44 * pages of all zeros. 45 */ 46 #define PGFL_UNKNOWN 0 47 #define PGFL_ZEROS 1 48 #define PGFL_NQUEUES 2 49 50 struct pgflbucket { 51 struct pgflist pgfl_queues[PGFL_NQUEUES]; 52 }; 53 54 struct pgfreelist { 55 struct pgflbucket *pgfl_buckets; 56 }; 57 58 #endif /* _UVM_UVM_PGLIST_H_ */ 59