root / lab4 / .minix-src / include / uvm / uvm_pglist.h
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| 1 | 13 | up20180614 | /* $NetBSD: uvm_pglist.h,v 1.8 2010/11/06 15:48:00 uebayasi Exp $ */
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| 2 | |||
| 3 | /*-
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| 4 | * Copyright (c) 2000, 2001, 2008 The NetBSD Foundation, Inc.
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * This code is derived from software contributed to The NetBSD Foundation
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| 8 | * by Jason R. Thorpe.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without
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| 11 | * modification, are permitted provided that the following conditions
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| 12 | * are met:
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright
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| 16 | * notice, this list of conditions and the following disclaimer in the
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| 17 | * documentation and/or other materials provided with the distribution.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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| 29 | * POSSIBILITY OF SUCH DAMAGE.
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| 30 | */
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| 31 | |||
| 32 | #ifndef _UVM_UVM_PGLIST_H_
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| 33 | #define _UVM_UVM_PGLIST_H_
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| 34 | |||
| 35 | /*
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| 36 | * This defines the type of a page queue, e.g. active list, inactive
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| 37 | * list, etc.
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| 38 | */
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| 39 | struct vm_page;
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| 40 | TAILQ_HEAD(pglist, vm_page); |
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| 41 | LIST_HEAD(pgflist, vm_page); |
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| 42 | |||
| 43 | /*
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| 44 | * A page free list consists of free pages of unknown contents and free
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| 45 | * pages of all zeros.
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| 46 | */
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| 47 | #define PGFL_UNKNOWN 0 |
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| 48 | #define PGFL_ZEROS 1 |
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| 49 | #define PGFL_NQUEUES 2 |
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| 50 | |||
| 51 | struct pgflbucket {
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| 52 | struct pgflist pgfl_queues[PGFL_NQUEUES];
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| 53 | }; |
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| 54 | |||
| 55 | struct pgfreelist {
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| 56 | struct pgflbucket *pgfl_buckets;
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| 57 | }; |
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| 58 | |||
| 59 | #endif /* _UVM_UVM_PGLIST_H_ */ |