sf_buf.h revision 255318 
1/*-
2 * Copyright (c) 2003 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: head/sys/arm/include/sf_buf.h 255318 2013-09-06 17:44:13Z glebius $
27 */
28
29#ifndef _MACHINE_SF_BUF_H_
30#define _MACHINE_SF_BUF_H_
31
32
33struct vm_page;
34
35#ifdef ARM_USE_SMALL_ALLOC
36
37#include <vm/vm.h>
38#include <vm/vm_param.h>
39#include <vm/vm_page.h>
40
41struct sf_buf;
42
43struct sf_buf *	sf_buf_alloc(struct vm_page *m, int flags);
44void sf_buf_free(struct sf_buf *sf);
45
46static __inline vm_offset_t
47sf_buf_kva(struct sf_buf *sf)
48{
49	return arm_ptovirt(VM_PAGE_TO_PHYS((vm_page_t)sf));
50}
51
52static __inline vm_page_t
53sf_buf_page(struct sf_buf *sf)
54{
55	return ((vm_page_t)sf);
56}
57
58#else
59
60#include <sys/queue.h>
61
62struct sf_buf {
63	LIST_ENTRY(sf_buf) list_entry;	/* list of buffers */
64	TAILQ_ENTRY(sf_buf) free_entry;	/* list of buffers */
65	struct		vm_page *m;	/* currently mapped page */
66	vm_offset_t	kva;		/* va of mapping */
67	int		ref_count;	/* usage of this mapping */
68};
69
70static __inline vm_offset_t
71sf_buf_kva(struct sf_buf *sf)
72{
73
74	return (sf->kva);
75}
76
77static __inline struct vm_page *
78sf_buf_page(struct sf_buf *sf)
79{
80
81	return (sf->m);
82}
83
84#endif
85#endif /* !_MACHINE_SF_BUF_H_ */
86