usr/src/boot/sys/sys/endian.h

   1 /*-
   2  * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 #ifndef _SYS_ENDIAN_H_
  30 #define _SYS_ENDIAN_H_
  31
  32 #include <sys/cdefs.h>
  33 #include <sys/_types.h>
  34 #include <machine/endian.h>
  35
  36 #ifndef _UINT8_T_DECLARED
  37 typedef __uint8_t       uint8_t;
  38 #define _UINT8_T_DECLARED
  39 #endif
  40
  41 #ifndef _UINT16_T_DECLARED
  42 typedef __uint16_t      uint16_t;
  43 #define _UINT16_T_DECLARED
  44 #endif
  45
  46 #ifndef _UINT32_T_DECLARED
  47 typedef __uint32_t      uint32_t;
  48 #define _UINT32_T_DECLARED
  49 #endif
  50
  51 #ifndef _UINT64_T_DECLARED
  52 typedef __uint64_t      uint64_t;
  53 #define _UINT64_T_DECLARED
  54 #endif
  55
  56 /*
  57  * General byte order swapping functions.
  58  */
  59 #define bswap16(x)      __bswap16(x)
  60 #define bswap32(x)      __bswap32(x)
  61 #define bswap64(x)      __bswap64(x)
  62
  63 /*
  64  * Host to big endian, host to little endian, big endian to host, and little
  65  * endian to host byte order functions as detailed in byteorder(9).
  66  */
  67 #if _BYTE_ORDER == _LITTLE_ENDIAN
  68 #define htobe16(x)      bswap16((x))
  69 #define htobe32(x)      bswap32((x))
  70 #define htobe64(x)      bswap64((x))
  71 #define htole16(x)      ((uint16_t)(x))
  72 #define htole32(x)      ((uint32_t)(x))
  73 #define htole64(x)      ((uint64_t)(x))
  74
  75 #define be16toh(x)      bswap16((x))
  76 #define be32toh(x)      bswap32((x))
  77 #define be64toh(x)      bswap64((x))
  78 #define le16toh(x)      ((uint16_t)(x))
  79 #define le32toh(x)      ((uint32_t)(x))
  80 #define le64toh(x)      ((uint64_t)(x))
  81 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */
  82 #define htobe16(x)      ((uint16_t)(x))
  83 #define htobe32(x)      ((uint32_t)(x))
  84 #define htobe64(x)      ((uint64_t)(x))
  85 #define htole16(x)      bswap16((x))
  86 #define htole32(x)      bswap32((x))
  87 #define htole64(x)      bswap64((x))
  88
  89 #define be16toh(x)      ((uint16_t)(x))
  90 #define be32toh(x)      ((uint32_t)(x))
  91 #define be64toh(x)      ((uint64_t)(x))
  92 #define le16toh(x)      bswap16((x))
  93 #define le32toh(x)      bswap32((x))
  94 #define le64toh(x)      bswap64((x))
  95 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
  96
  97 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
  98
  99 static __inline uint16_t
 100 be16dec(const void *pp)
 101 {
 102         uint8_t const *p = (uint8_t const *)pp;
 103
 104         return ((p[0] << 8) | p[1]);
 105 }
 106
 107 static __inline uint32_t
 108 be32dec(const void *pp)
 109 {
 110         uint8_t const *p = (uint8_t const *)pp;
 111
 112         return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
 113 }
 114
 115 static __inline uint64_t
 116 be64dec(const void *pp)
 117 {
 118         uint8_t const *p = (uint8_t const *)pp;
 119
 120         return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
 121 }
 122
 123 static __inline uint16_t
 124 le16dec(const void *pp)
 125 {
 126         uint8_t const *p = (uint8_t const *)pp;
 127
 128         return ((p[1] << 8) | p[0]);
 129 }
 130
 131 static __inline uint32_t
 132 le32dec(const void *pp)
 133 {
 134         uint8_t const *p = (uint8_t const *)pp;
 135
 136         return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
 137 }
 138
 139 static __inline uint64_t
 140 le64dec(const void *pp)
 141 {
 142         uint8_t const *p = (uint8_t const *)pp;
 143
 144         return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
 145 }
 146
 147 static __inline void
 148 be16enc(void *pp, uint16_t u)
 149 {
 150         uint8_t *p = (uint8_t *)pp;
 151
 152         p[0] = (u >> 8) & 0xff;
 153         p[1] = u & 0xff;
 154 }
 155
 156 static __inline void
 157 be32enc(void *pp, uint32_t u)
 158 {
 159         uint8_t *p = (uint8_t *)pp;
 160
 161         p[0] = (u >> 24) & 0xff;
 162         p[1] = (u >> 16) & 0xff;
 163         p[2] = (u >> 8) & 0xff;
 164         p[3] = u & 0xff;
 165 }
 166
 167 static __inline void
 168 be64enc(void *pp, uint64_t u)
 169 {
 170         uint8_t *p = (uint8_t *)pp;
 171
 172         be32enc(p, (uint32_t)(u >> 32));
 173         be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
 174 }
 175
 176 static __inline void
 177 le16enc(void *pp, uint16_t u)
 178 {
 179         uint8_t *p = (uint8_t *)pp;
 180
 181         p[0] = u & 0xff;
 182         p[1] = (u >> 8) & 0xff;
 183 }
 184
 185 static __inline void
 186 le32enc(void *pp, uint32_t u)
 187 {
 188         uint8_t *p = (uint8_t *)pp;
 189
 190         p[0] = u & 0xff;
 191         p[1] = (u >> 8) & 0xff;
 192         p[2] = (u >> 16) & 0xff;
 193         p[3] = (u >> 24) & 0xff;
 194 }
 195
 196 static __inline void
 197 le64enc(void *pp, uint64_t u)
 198 {
 199         uint8_t *p = (uint8_t *)pp;
 200
 201         le32enc(p, (uint32_t)(u & 0xffffffffU));
 202         le32enc(p + 4, (uint32_t)(u >> 32));
 203 }
 204
 205 #endif  /* _SYS_ENDIAN_H_ */