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sys/dev/virtio/virtio_endian.h
- This file was added.
| /*- | |||||
| * SPDX-License-Identifier: BSD-2-Clause | |||||
| * | |||||
| * Copyright (c) 2017, Bryan Venteicher <bryanv@FreeBSD.org> | |||||
| * All rights reserved. | |||||
| * | |||||
| * Redistribution and use in source and binary forms, with or without | |||||
| * modification, are permitted provided that the following conditions | |||||
| * are met: | |||||
| * 1. Redistributions of source code must retain the above copyright | |||||
| * notice unmodified, this list of conditions, and the following | |||||
| * disclaimer. | |||||
| * 2. Redistributions in binary form must reproduce the above copyright | |||||
| * notice, this list of conditions and the following disclaimer in the | |||||
| * documentation and/or other materials provided with the distribution. | |||||
| * | |||||
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |||||
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |||||
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |||||
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |||||
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |||||
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |||||
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |||||
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |||||
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |||||
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |||||
| * | |||||
| * $FreeBSD$ | |||||
| */ | |||||
| #ifndef _VIRTIO_ENDIAN_H_ | |||||
| #define _VIRTIO_ENDIAN_H_ | |||||
| #include <sys/endian.h> | |||||
| /* | |||||
| * VirtIO V1 (modern) uses little endian, while legacy VirtIO uses the guest's | |||||
| * native endian. These functions convert to and from the Guest's (driver's) | |||||
| * and the Host's (device's) endianness when needed. | |||||
| */ | |||||
| static inline bool | |||||
| virtio_swap_endian(bool modern) | |||||
| { | |||||
| #if _BYTE_ORDER == _LITTLE_ENDIAN | |||||
| return (false); | |||||
| #else | |||||
| return (modern); | |||||
| #endif | |||||
| } | |||||
| static inline uint16_t | |||||
| virtio_htog16(bool modern, uint16_t val) | |||||
| { | |||||
| if (virtio_swap_endian(modern)) | |||||
| return (le16toh(val)); | |||||
| else | |||||
| return (val); | |||||
| } | |||||
| static inline uint16_t | |||||
| virtio_gtoh16(bool modern, uint16_t val) | |||||
| { | |||||
| if (virtio_swap_endian(modern)) | |||||
| return (htole16(val)); | |||||
| else | |||||
| return (val); | |||||
| } | |||||
| static inline uint32_t | |||||
| virtio_htog32(bool modern, uint32_t val) | |||||
| { | |||||
| if (virtio_swap_endian(modern)) | |||||
| return (le32toh(val)); | |||||
| else | |||||
| return (val); | |||||
| } | |||||
| static inline uint32_t | |||||
| virtio_gtoh32(bool modern, uint32_t val) | |||||
| { | |||||
| if (virtio_swap_endian(modern)) | |||||
| return (htole32(val)); | |||||
| else | |||||
| return (val); | |||||
| } | |||||
| static inline uint64_t | |||||
| virtio_htog64(bool modern, uint64_t val) | |||||
| { | |||||
| if (virtio_swap_endian(modern)) | |||||
| return (le64toh(val)); | |||||
| else | |||||
| return (val); | |||||
| } | |||||
| static inline uint64_t | |||||
| virtio_gtoh64(bool modern, uint64_t val) | |||||
| { | |||||
| if (virtio_swap_endian(modern)) | |||||
| return (htole64(val)); | |||||
| else | |||||
| return (val); | |||||
| } | |||||
| #endif /* _VIRTIO_ENDIAN_H_ */ | |||||