2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2017, Bryan Venteicher <bryanv@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
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.
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.
31 #ifndef _VIRTIO_ENDIAN_H_
32 #define _VIRTIO_ENDIAN_H_
34 #include <sys/endian.h>
40 * VirtIO V1 (modern) uses little endian, while legacy VirtIO uses the guest's
41 * native endian. These functions convert to and from the Guest's (driver's)
42 * and the Host's (device's) endianness when needed.
46 virtio_swap_endian(bool modern)
48 #if _BYTE_ORDER == _LITTLE_ENDIAN
55 static inline uint16_t
56 virtio_htog16(bool modern, uint16_t val)
58 if (virtio_swap_endian(modern))
59 return (le16toh(val));
64 static inline uint16_t
65 virtio_gtoh16(bool modern, uint16_t val)
67 if (virtio_swap_endian(modern))
68 return (htole16(val));
73 static inline uint32_t
74 virtio_htog32(bool modern, uint32_t val)
76 if (virtio_swap_endian(modern))
77 return (le32toh(val));
82 static inline uint32_t
83 virtio_gtoh32(bool modern, uint32_t val)
85 if (virtio_swap_endian(modern))
86 return (htole32(val));
91 static inline uint64_t
92 virtio_htog64(bool modern, uint64_t val)
94 if (virtio_swap_endian(modern))
95 return (le64toh(val));
100 static inline uint64_t
101 virtio_gtoh64(bool modern, uint64_t val)
103 if (virtio_swap_endian(modern))
104 return (htole64(val));
109 #endif /* _VIRTIO_ENDIAN_H_ */