include/os/freebsd/spl/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 https://opensource.org/licenses/CDDL-1.0.
  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  * $FreeBSD$
  22  */
  23
  24 /*
  25  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28
  29 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  30 /*        All Rights Reserved   */
  31
  32 /*
  33  * University Copyright- Copyright (c) 1982, 1986, 1988
  34  * The Regents of the University of California
  35  * All Rights Reserved
  36  *
  37  * University Acknowledgment- Portions of this document are derived from
  38  * software developed by the University of California, Berkeley, and its
  39  * contributors.
  40  */
  41
  42 #ifndef _OPENSOLARIS_SYS_BYTEORDER_H_
  43 #define _OPENSOLARIS_SYS_BYTEORDER_H_
  44
  45 #include <sys/endian.h>
  46
  47 #ifdef __COVERITY__
  48 /*
  49  * Coverity's taint warnings from byteswapping are false positives for us.
  50  * Suppress them by hiding byteswapping from Coverity.
  51  */
  52 #define BSWAP_8(x)      ((x) & 0xff)
  53 #define BSWAP_16(x)     ((x) & 0xffff)
  54 #define BSWAP_32(x)     ((x) & 0xffffffff)
  55 #define BSWAP_64(x)     (x)
  56
  57 #else /* __COVERITY__ */
  58
  59 /*
  60  * Macros to reverse byte order
  61  */
  62 #define BSWAP_8(x)      ((x) & 0xff)
  63 #define BSWAP_16(x)     ((BSWAP_8(x) << 8) | BSWAP_8((x) >> 8))
  64 #define BSWAP_32(x)     ((BSWAP_16(x) << 16) | BSWAP_16((x) >> 16))
  65 #define BSWAP_64(x)     ((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32))
  66
  67 #endif /* __COVERITY__ */
  68
  69 #define BMASK_8(x)      ((x) & 0xff)
  70 #define BMASK_16(x)     ((x) & 0xffff)
  71 #define BMASK_32(x)     ((x) & 0xffffffff)
  72 #define BMASK_64(x)     (x)
  73
  74 /*
  75  * Macros to convert from a specific byte order to/from native byte order
  76  */
  77 #if BYTE_ORDER == _BIG_ENDIAN
  78 #define BE_8(x)         BMASK_8(x)
  79 #define BE_16(x)        BMASK_16(x)
  80 #define BE_32(x)        BMASK_32(x)
  81 #define BE_64(x)        BMASK_64(x)
  82 #define LE_8(x)         BSWAP_8(x)
  83 #define LE_16(x)        BSWAP_16(x)
  84 #define LE_32(x)        BSWAP_32(x)
  85 #define LE_64(x)        BSWAP_64(x)
  86 #else
  87 #define LE_8(x)         BMASK_8(x)
  88 #define LE_16(x)        BMASK_16(x)
  89 #define LE_32(x)        BMASK_32(x)
  90 #define LE_64(x)        BMASK_64(x)
  91 #define BE_8(x)         BSWAP_8(x)
  92 #define BE_16(x)        BSWAP_16(x)
  93 #define BE_32(x)        BSWAP_32(x)
  94 #define BE_64(x)        BSWAP_64(x)
  95 #endif
  96
  97 #if !defined(_STANDALONE)
  98 #if BYTE_ORDER == _BIG_ENDIAN
  99 #define htonll(x)       BMASK_64(x)
 100 #define ntohll(x)       BMASK_64(x)
 101 #else /* BYTE_ORDER == _LITTLE_ENDIAN */
 102 #ifndef __LP64__
 103 static __inline__ uint64_t
 104 htonll(uint64_t n)
 105 {
 106         return ((((uint64_t)htonl(n)) << 32) + htonl(n >> 32));
 107 }
 108
 109 static __inline__ uint64_t
 110 ntohll(uint64_t n)
 111 {
 112         return ((((uint64_t)ntohl(n)) << 32) + ntohl(n >> 32));
 113 }
 114 #else   /* !__LP64__ */
 115 #define htonll(x)       BSWAP_64(x)
 116 #define ntohll(x)       BSWAP_64(x)
 117 #endif  /* __LP64__ */
 118 #endif  /* BYTE_ORDER */
 119 #endif  /* _STANDALONE */
 120
 121 #define BE_IN32(xa)     htonl(*((uint32_t *)(void *)(xa)))
 122
 123 #endif /* _OPENSOLARIS_SYS_BYTEORDER_H_ */