1/*-
2 * Copyright (c) 2003, 2005 Alan L. Cox <alc@cs.rice.edu>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29#ifndef _MACHINE_SF_BUF_H_
30#define _MACHINE_SF_BUF_H_
31
32#include <sys/_cpuset.h>
33#include <sys/queue.h>
34
35struct vm_page;
36
37struct sf_buf {
38	LIST_ENTRY(sf_buf) list_entry;	/* list of buffers */
39	TAILQ_ENTRY(sf_buf) free_entry;	/* list of buffers */
40	struct		vm_page *m;	/* currently mapped page */
41	vm_offset_t	kva;		/* va of mapping */
42	int		ref_count;	/* usage of this mapping */
43#ifdef SMP
44	cpuset_t	cpumask;	/* cpus on which mapping is valid */
45#endif
46};
47
48struct sf_buf * sf_buf_alloc(struct vm_page *m, int flags);
49void sf_buf_free(struct sf_buf *sf);
50
51static __inline vm_offset_t
52sf_buf_kva(struct sf_buf *sf)
53{
54
55	return (sf->kva);
56}
57
58static __inline struct vm_page *
59sf_buf_page(struct sf_buf *sf)
60{
61
62	return (sf->m);
63}
64
65boolean_t sf_buf_invalidate_cache(vm_page_t m);
66
67#endif /* !_MACHINE_SF_BUF_H_ */
68