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uvm_pglist.h revision 1.5.118.1 
      1 /*	$NetBSD: uvm_pglist.h,v 1.5.118.1 2008/06/02 13:24:38 mjf Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2000, 2001 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 
     41 /*
     42  * A page free list consists of free pages of unknown contents and free
     43  * pages of all zeros.
     44  */
     45 #define	PGFL_UNKNOWN	0
     46 #define	PGFL_ZEROS	1
     47 #define	PGFL_NQUEUES	2
     48 
     49 struct pgflbucket {
     50 	struct pglist pgfl_queues[PGFL_NQUEUES];
     51 };
     52 
     53 struct pgfreelist {
     54 	struct pgflbucket *pgfl_buckets;
     55 };
     56 
     57 #endif /* _UVM_UVM_PGLIST_H_ */
     58