1/*	$NetBSD: uvm_swap.h,v 1.29 2024/03/15 22:15:21 andvar Exp $	*/
2
3/*
4 * Copyright (c) 1997 Matthew R. Green
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * from: Id: uvm_swap.h,v 1.1.2.6 1997/12/15 05:39:31 mrg Exp
29 */
30
31#ifndef _UVM_UVM_SWAP_H_
32#define _UVM_UVM_SWAP_H_
33
34#define	SWSLOT_BAD	(-1)
35
36#if defined(_KERNEL) || defined(_MODULE)
37#if defined(_KERNEL_OPT)
38#include "opt_vmswap.h"
39#endif
40
41struct lwp;
42struct swapent;
43
44#if defined(VMSWAP)
45
46struct vm_page;
47
48int	uvm_swap_get(struct vm_page *, int, int);
49int	uvm_swap_put(int, struct vm_page **, int, int);
50int	uvm_swap_alloc(int *, bool);
51void	uvm_swap_free(int, int);
52void	uvm_swap_markbad(int, int);
53bool	uvm_swapisfull(void);
54void	swapsys_lock(krw_t);
55void	swapsys_unlock(void);
56int	uvm_swap_stats(char *, int,
57    void (*)(void *, const struct swapent *), size_t, register_t *);
58
59#else /* defined(VMSWAP) */
60
61#define	uvm_swapisfull()	true
62
63static inline int
64uvm_swap_stats(char *c, int l, void (*f)(void *, const struct swapent *),
65    size_t count, register_t *retval)
66{
67
68	*retval = 0;
69	return ENOSYS;
70}
71
72#endif /* defined(VMSWAP) */
73
74void	uvm_swap_shutdown(struct lwp *);
75
76#endif /* _KERNEL || _MODULE */
77
78#endif /* _UVM_UVM_SWAP_H_ */
79