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
43 static inline uint16_t
virtio_htog16(bool modern,uint16_t val)44 virtio_htog16(bool modern, uint16_t val)
45 {
46 if (modern)
47 return (le16toh(val));
48 else
49 return (val);
50 }
51
52 static inline uint16_t
virtio_gtoh16(bool modern,uint16_t val)53 virtio_gtoh16(bool modern, uint16_t val)
54 {
55 if (modern)
56 return (htole16(val));
57 else
58 return (val);
59 }
60
61 static inline uint32_t
virtio_htog32(bool modern,uint32_t val)62 virtio_htog32(bool modern, uint32_t val)
63 {
64 if (modern)
65 return (le32toh(val));
66 else
67 return (val);
68 }
69
70 static inline uint32_t
virtio_gtoh32(bool modern,uint32_t val)71 virtio_gtoh32(bool modern, uint32_t val)
72 {
73 if (modern)
74 return (htole32(val));
75 else
76 return (val);
77 }
78
79 static inline uint64_t
virtio_htog64(bool modern,uint64_t val)80 virtio_htog64(bool modern, uint64_t val)
81 {
82 if (modern)
83 return (le64toh(val));
84 else
85 return (val);
86 }
87
88 static inline uint64_t
virtio_gtoh64(bool modern,uint64_t val)89 virtio_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