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 * $FreeBSD$
27 */
28
29#ifndef _MACHINE_SF_BUF_H_
30#define _MACHINE_SF_BUF_H_
31
32#ifdef __mips_n64
33#include <vm/vm.h>
34#include <vm/vm_param.h>
35#include <vm/vm_page.h>
36#else
37#include <sys/queue.h>
38#endif
39
40#ifdef __mips_n64
41/* In 64 bit the whole memory is directly mapped */
42struct	sf_buf;
43
44static __inline vm_offset_t
45sf_buf_kva(struct sf_buf *sf)
46{
47	vm_page_t	m;
48
49	m = (vm_page_t)sf;
50	return (MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(m)));
51}
52
53static __inline struct vm_page *
54sf_buf_page(struct sf_buf *sf)
55{
56
57	return ((vm_page_t)sf);
58}
59
60#else /* ! __mips_n64 */
61struct vm_page;
62
63struct sf_buf {
64	SLIST_ENTRY(sf_buf) free_list;	/* list of free buffer slots */
65	struct		vm_page *m;	/* currently mapped page */
66	vm_offset_t	kva;		/* va of mapping */
67};
68
69static __inline vm_offset_t
70sf_buf_kva(struct sf_buf *sf)
71{
72
73	return (sf->kva);
74}
75
76static __inline struct vm_page *
77sf_buf_page(struct sf_buf *sf)
78{
79
80	return (sf->m);
81}
82#endif /* __mips_n64 */
83
84#endif /* !_MACHINE_SF_BUF_H_ */
85