The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/bswap.h

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    1 /*      $NetBSD: bswap.h,v 1.19 2015/03/12 15:28:16 christos Exp $      */
    2 
    3 /* Written by Manuel Bouyer. Public domain */
    4 
    5 #ifndef _SYS_BSWAP_H_
    6 #define _SYS_BSWAP_H_
    7 
    8 #ifndef _LOCORE
    9 #include <sys/stdint.h>
   10 
   11 #include <machine/bswap.h>
   12 
   13 __BEGIN_DECLS
   14 /* Always declare the functions in case their address is taken (etc) */
   15 #if defined(_KERNEL) || defined(_STANDALONE) || !defined(__BSWAP_RENAME)
   16 uint16_t bswap16(uint16_t) __constfunc;
   17 uint32_t bswap32(uint32_t) __constfunc;
   18 #else
   19 uint16_t bswap16(uint16_t) __RENAME(__bswap16) __constfunc;
   20 uint32_t bswap32(uint32_t) __RENAME(__bswap32) __constfunc;
   21 #endif
   22 uint64_t bswap64(uint64_t) __constfunc;
   23 __END_DECLS
   24 
   25 #if defined(__GNUC__) && !defined(__lint__)
   26 
   27 /* machine/byte_swap.h might have defined inline versions */
   28 #ifndef __BYTE_SWAP_U64_VARIABLE
   29 #define __BYTE_SWAP_U64_VARIABLE bswap64
   30 #endif
   31 
   32 #ifndef __BYTE_SWAP_U32_VARIABLE
   33 #define __BYTE_SWAP_U32_VARIABLE bswap32
   34 #endif
   35 
   36 #ifndef __BYTE_SWAP_U16_VARIABLE
   37 #define __BYTE_SWAP_U16_VARIABLE bswap16
   38 #endif
   39 
   40 #define __byte_swap_u64_constant(x) \
   41         (__CAST(uint64_t, \
   42          ((((x) & 0xff00000000000000ull) >> 56) | \
   43           (((x) & 0x00ff000000000000ull) >> 40) | \
   44           (((x) & 0x0000ff0000000000ull) >> 24) | \
   45           (((x) & 0x000000ff00000000ull) >>  8) | \
   46           (((x) & 0x00000000ff000000ull) <<  8) | \
   47           (((x) & 0x0000000000ff0000ull) << 24) | \
   48           (((x) & 0x000000000000ff00ull) << 40) | \
   49           (((x) & 0x00000000000000ffull) << 56))))
   50 
   51 #define __byte_swap_u32_constant(x) \
   52         (__CAST(uint32_t, \
   53         ((((x) & 0xff000000) >> 24) | \
   54          (((x) & 0x00ff0000) >>  8) | \
   55          (((x) & 0x0000ff00) <<  8) | \
   56          (((x) & 0x000000ff) << 24))))
   57 
   58 #define __byte_swap_u16_constant(x) \
   59         (__CAST(uint16_t, \
   60         ((((x) & 0xff00) >> 8) | \
   61          (((x) & 0x00ff) << 8))))
   62 
   63 #define bswap64(x) \
   64         __CAST(uint64_t, __builtin_constant_p((x)) ? \
   65          __byte_swap_u64_constant(x) : __BYTE_SWAP_U64_VARIABLE(x))
   66 
   67 #define bswap32(x) \
   68         __CAST(uint32_t, __builtin_constant_p((x)) ? \
   69          __byte_swap_u32_constant(x) : __BYTE_SWAP_U32_VARIABLE(x))
   70 
   71 #define bswap16(x) \
   72         __CAST(uint16_t, __builtin_constant_p((x)) ? \
   73          __byte_swap_u16_constant(x) : __BYTE_SWAP_U16_VARIABLE(x))
   74 
   75 #endif /* __GNUC__ && !__lint__ */
   76 #endif /* !_LOCORE */
   77 
   78 #endif /* !_SYS_BSWAP_H_ */

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