lib/libspl/include/sys/byteorder.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40 #ifndef _SYS_BYTEORDER_H
  41 #define _SYS_BYTEORDER_H
  42
  43
  44
  45 #include <sys/isa_defs.h>
  46 #include <sys/int_types.h>
  47
  48 #if defined(__GNUC__) && defined(_ASM_INLINES) && \
  49         (defined(__i386) || defined(__amd64))
  50 #include <asm/byteorder.h>
  51 #endif
  52
  53 #ifdef  __cplusplus
  54 extern "C" {
  55 #endif
  56
  57 /*
  58  * macros for conversion between host and (internet) network byte order
  59  */
  60
  61 #if defined(_BIG_ENDIAN) && !defined(ntohl) && !defined(__lint)
  62 /* big-endian */
  63 #define ntohl(x)        (x)
  64 #define ntohs(x)        (x)
  65 #define htonl(x)        (x)
  66 #define htons(x)        (x)
  67
  68 #elif !defined(ntohl) /* little-endian */
  69
  70 #ifndef _IN_PORT_T
  71 #define _IN_PORT_T
  72 typedef uint16_t in_port_t;
  73 #endif
  74
  75 #ifndef _IN_ADDR_T
  76 #define _IN_ADDR_T
  77 typedef uint32_t in_addr_t;
  78 #endif
  79
  80 #if !defined(_XPG4_2) || defined(__EXTENSIONS__) || defined(_XPG5)
  81 extern  uint32_t htonl(uint32_t);
  82 extern  uint16_t htons(uint16_t);
  83 extern  uint32_t ntohl(uint32_t);
  84 extern  uint16_t ntohs(uint16_t);
  85 #else
  86 extern  in_addr_t htonl(in_addr_t);
  87 extern  in_port_t htons(in_port_t);
  88 extern  in_addr_t ntohl(in_addr_t);
  89 extern  in_port_t ntohs(in_port_t);
  90 #endif  /* !defined(_XPG4_2) || defined(__EXTENSIONS__) || defined(_XPG5) */
  91 #endif
  92
  93 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
  94
  95 /*
  96  * Macros to reverse byte order
  97  */
  98 #define BSWAP_8(x)      ((x) & 0xff)
  99 #define BSWAP_16(x)     ((BSWAP_8(x) << 8) | BSWAP_8((x) >> 8))
 100 #define BSWAP_32(x)     ((BSWAP_16(x) << 16) | BSWAP_16((x) >> 16))
 101 #define BSWAP_64(x)     ((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32))
 102
 103 #define BMASK_8(x)      ((x) & 0xff)
 104 #define BMASK_16(x)     ((x) & 0xffff)
 105 #define BMASK_32(x)     ((x) & 0xffffffff)
 106 #define BMASK_64(x)     (x)
 107
 108 /*
 109  * Macros to convert from a specific byte order to/from native byte order
 110  */
 111 #ifdef _BIG_ENDIAN
 112 #define BE_8(x)         BMASK_8(x)
 113 #define BE_16(x)        BMASK_16(x)
 114 #define BE_32(x)        BMASK_32(x)
 115 #define BE_64(x)        BMASK_64(x)
 116 #define LE_8(x)         BSWAP_8(x)
 117 #define LE_16(x)        BSWAP_16(x)
 118 #define LE_32(x)        BSWAP_32(x)
 119 #define LE_64(x)        BSWAP_64(x)
 120 #else
 121 #define LE_8(x)         BMASK_8(x)
 122 #define LE_16(x)        BMASK_16(x)
 123 #define LE_32(x)        BMASK_32(x)
 124 #define LE_64(x)        BMASK_64(x)
 125 #define BE_8(x)         BSWAP_8(x)
 126 #define BE_16(x)        BSWAP_16(x)
 127 #define BE_32(x)        BSWAP_32(x)
 128 #define BE_64(x)        BSWAP_64(x)
 129 #endif
 130
 131 /*
 132  * Macros to read unaligned values from a specific byte order to
 133  * native byte order
 134  */
 135
 136 #define BE_IN8(xa) \
 137         *((uint8_t *)(xa))
 138
 139 #define BE_IN16(xa) \
 140         (((uint16_t)BE_IN8(xa) << 8) | BE_IN8((uint8_t *)(xa)+1))
 141
 142 #define BE_IN32(xa) \
 143         (((uint32_t)BE_IN16(xa) << 16) | BE_IN16((uint8_t *)(xa)+2))
 144
 145 #define BE_IN64(xa) \
 146         (((uint64_t)BE_IN32(xa) << 32) | BE_IN32((uint8_t *)(xa)+4))
 147
 148 #define LE_IN8(xa) \
 149         *((uint8_t *)(xa))
 150
 151 #define LE_IN16(xa) \
 152         (((uint16_t)LE_IN8((uint8_t *)(xa) + 1) << 8) | LE_IN8(xa))
 153
 154 #define LE_IN32(xa) \
 155         (((uint32_t)LE_IN16((uint8_t *)(xa) + 2) << 16) | LE_IN16(xa))
 156
 157 #define LE_IN64(xa) \
 158         (((uint64_t)LE_IN32((uint8_t *)(xa) + 4) << 32) | LE_IN32(xa))
 159
 160 /*
 161  * Macros to write unaligned values from native byte order to a specific byte
 162  * order.
 163  */
 164
 165 #define BE_OUT8(xa, yv) *((uint8_t *)(xa)) = (uint8_t)(yv);
 166
 167 #define BE_OUT16(xa, yv) \
 168         BE_OUT8((uint8_t *)(xa) + 1, yv); \
 169         BE_OUT8((uint8_t *)(xa), (yv) >> 8);
 170
 171 #define BE_OUT32(xa, yv) \
 172         BE_OUT16((uint8_t *)(xa) + 2, yv); \
 173         BE_OUT16((uint8_t *)(xa), (yv) >> 16);
 174
 175 #define BE_OUT64(xa, yv) \
 176         BE_OUT32((uint8_t *)(xa) + 4, yv); \
 177         BE_OUT32((uint8_t *)(xa), (yv) >> 32);
 178
 179 #define LE_OUT8(xa, yv) *((uint8_t *)(xa)) = (uint8_t)(yv);
 180
 181 #define LE_OUT16(xa, yv) \
 182         LE_OUT8((uint8_t *)(xa), yv); \
 183         LE_OUT8((uint8_t *)(xa) + 1, (yv) >> 8);
 184
 185 #define LE_OUT32(xa, yv) \
 186         LE_OUT16((uint8_t *)(xa), yv); \
 187         LE_OUT16((uint8_t *)(xa) + 2, (yv) >> 16);
 188
 189 #define LE_OUT64(xa, yv) \
 190         LE_OUT32((uint8_t *)(xa), yv); \
 191         LE_OUT32((uint8_t *)(xa) + 4, (yv) >> 32);
 192
 193 #endif  /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
 194
 195 #ifdef  __cplusplus
 196 }
 197 #endif
 198
 199 #endif /* _SYS_BYTEORDER_H */