1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2017, Bryan Venteicher <bryanv@FreeBSD.org>
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 unmodified, this list of conditions, and the following
12 *    disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef _VIRTIO_ENDIAN_H_
30#define _VIRTIO_ENDIAN_H_
31
32#include <sys/endian.h>
33#ifndef _KERNEL
34#include <stdbool.h>
35#endif /* _KERNEL */
36
37/*
38 * VirtIO V1 (modern) uses little endian, while legacy VirtIO uses the guest's
39 * native endian. These functions convert to and from the Guest's (driver's)
40 * and the Host's (device's) endianness when needed.
41 */
42
43static inline uint16_t
44virtio_htog16(bool modern, uint16_t val)
45{
46	if (modern)
47		return (le16toh(val));
48	else
49		return (val);
50}
51
52static inline uint16_t
53virtio_gtoh16(bool modern, uint16_t val)
54{
55	if (modern)
56		return (htole16(val));
57	else
58		return (val);
59}
60
61static inline uint32_t
62virtio_htog32(bool modern, uint32_t val)
63{
64	if (modern)
65		return (le32toh(val));
66	else
67		return (val);
68}
69
70static inline uint32_t
71virtio_gtoh32(bool modern, uint32_t val)
72{
73	if (modern)
74		return (htole32(val));
75	else
76		return (val);
77}
78
79static inline uint64_t
80virtio_htog64(bool modern, uint64_t val)
81{
82	if (modern)
83		return (le64toh(val));
84	else
85		return (val);
86}
87
88static inline uint64_t
89virtio_gtoh64(bool modern, uint64_t val)
90{
91	if (modern)
92		return (htole64(val));
93	else
94		return (val);
95}
96
97#endif /* _VIRTIO_ENDIAN_H_ */
98