sf_buf.h revision 202175 
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 *	from: src/sys/i386/include/sf_buf.h,v 1.4 2005/02/13 06:23:13 alc
27 * $FreeBSD: head/sys/mips/include/sf_buf.h 202175 2010-01-12 21:36:08Z imp $
28 */
29
30#ifndef _MACHINE_SF_BUF_H_
31#define	_MACHINE_SF_BUF_H_
32
33#include <sys/queue.h>
34#include <vm/vm.h>
35#include <vm/vm_param.h>
36#include <vm/vm_page.h>
37
38struct vm_page;
39
40struct sf_buf {
41	LIST_ENTRY(sf_buf) list_entry;	/* list of buffers */
42	TAILQ_ENTRY(sf_buf) free_entry; /* list of buffers */
43	struct		vm_page *m;	/* currently mapped page */
44	vm_offset_t	kva;		/* va of mapping */
45	int		ref_count;	/* usage of this mapping */
46#ifdef SMP
47	cpumask_t	cpumask;	/* cpus on which mapping is valid */
48#endif
49};
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
65#endif /* !_MACHINE_SF_BUF_H_ */
66