FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/os/linux/spl/sys/byteorder.h

     /*
      *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
      *  Copyright (C) 2007 The Regents of the University of California.
      *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
      *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
      *  UCRL-CODE-235197
      *
      *  This file is part of the SPL, Solaris Porting Layer.
      *
     *  The SPL is free software; you can redistribute it and/or modify it
     *  under the terms of the GNU General Public License as published by the
     *  Free Software Foundation; either version 2 of the License, or (at your
     *  option) any later version.
     *
     *  The SPL is distributed in the hope that it will be useful, but WITHOUT
     *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     *  for more details.
     *
     *  You should have received a copy of the GNU General Public License along
     *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
     */
    
    #ifndef _SPL_BYTEORDER_H
    #define _SPL_BYTEORDER_H
    
    #include <asm/byteorder.h>
    
    #if defined(__BIG_ENDIAN) && !defined(_ZFS_BIG_ENDIAN)
    #define _ZFS_BIG_ENDIAN
    #endif
    
    #if defined(__LITTLE_ENDIAN) && !defined(_ZFS_LITTLE_ENDIAN)
    #define _ZFS_LITTLE_ENDIAN
    #endif
    
    #include <sys/isa_defs.h>
    
    #ifdef __COVERITY__
    /*
     * Coverity's taint warnings from byteswapping are false positives for us.
     * Suppress them by hiding byteswapping from Coverity.
     */
    
    #define BSWAP_8(x)      ((x) & 0xff)
    #define BSWAP_16(x)     ((x) & 0xffff)
    #define BSWAP_32(x)     ((x) & 0xffffffff)
    #define BSWAP_64(x)     (x)
    
    #else /* __COVERITY__ */
    
    #define BSWAP_8(x)      ((x) & 0xff)
    #define BSWAP_16(x)     ((BSWAP_8(x) << 8) | BSWAP_8((x) >> 8))
    #define BSWAP_32(x)     ((BSWAP_16(x) << 16) | BSWAP_16((x) >> 16))
    #define BSWAP_64(x)     ((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32))
    
    #endif /* __COVERITY__ */
    
    #define LE_16(x)        cpu_to_le16(x)
    #define LE_32(x)        cpu_to_le32(x)
    #define LE_64(x)        cpu_to_le64(x)
    #define BE_16(x)        cpu_to_be16(x)
    #define BE_32(x)        cpu_to_be32(x)
    #define BE_64(x)        cpu_to_be64(x)
    
    #define BE_IN8(xa) \
            *((uint8_t *)(xa))
    
    #define BE_IN16(xa) \
            (((uint16_t)BE_IN8(xa) << 8) | BE_IN8((uint8_t *)(xa)+1))
    
    #define BE_IN32(xa) \
            (((uint32_t)BE_IN16(xa) << 16) | BE_IN16((uint8_t *)(xa)+2))
    
    #ifdef _ZFS_BIG_ENDIAN
    static __inline__ uint64_t
    htonll(uint64_t n)
    {
            return (n);
    }
    
    static __inline__ uint64_t
    ntohll(uint64_t n)
    {
            return (n);
    }
    #else
    static __inline__ uint64_t
    htonll(uint64_t n)
    {
            return ((((uint64_t)htonl(n)) << 32) + htonl(n >> 32));
    }
    
    static __inline__ uint64_t
    ntohll(uint64_t n)
    {
            return ((((uint64_t)ntohl(n)) << 32) + ntohl(n >> 32));
    }
    #endif
   
   #endif /* SPL_BYTEORDER_H */

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