virtio_endian.h

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    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  * $FreeBSD$
   29  */
   30 
   31 #ifndef _VIRTIO_ENDIAN_H_
   32 #define _VIRTIO_ENDIAN_H_
   33 
   34 #include <sys/endian.h>
   35 #ifndef _KERNEL
   36 #include <stdbool.h>
   37 #endif /* _KERNEL */
   38 
   39 /*
   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.
   43  */
   44 
   45 static inline uint16_t
   46 virtio_htog16(bool modern, uint16_t val)
   47 {
   48         if (modern)
   49                 return (le16toh(val));
   50         else
   51                 return (val);
   52 }
   53 
   54 static inline uint16_t
   55 virtio_gtoh16(bool modern, uint16_t val)
   56 {
   57         if (modern)
   58                 return (htole16(val));
   59         else
   60                 return (val);
   61 }
   62 
   63 static inline uint32_t
   64 virtio_htog32(bool modern, uint32_t val)
   65 {
   66         if (modern)
   67                 return (le32toh(val));
   68         else
   69                 return (val);
   70 }
   71 
   72 static inline uint32_t
   73 virtio_gtoh32(bool modern, uint32_t val)
   74 {
   75         if (modern)
   76                 return (htole32(val));
   77         else
   78                 return (val);
   79 }
   80 
   81 static inline uint64_t
   82 virtio_htog64(bool modern, uint64_t val)
   83 {
   84         if (modern)
   85                 return (le64toh(val));
   86         else
   87                 return (val);
   88 }
   89 
   90 static inline uint64_t
   91 virtio_gtoh64(bool modern, uint64_t val)
   92 {
   93         if (modern)
   94                 return (htole64(val));
   95         else
   96                 return (val);
   97 }
   98 
   99 #endif /* _VIRTIO_ENDIAN_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/dev/virtio/virtio_endian.h

FreeBSD/Linux Kernel Cross Reference
sys/dev/virtio/virtio_endian.h