root/include/asm-mips/byteorder.h

/* */

INCLUDED FROM

DEFINITIONS

1. __ntohl
2. __ntohs

   1 #ifndef __ASM_MIPS_BYTEORDER_H
   2 #define __ASM_MIPS_BYTEORDER_H
   3 
   4 /*
   5  * FIXME: Add big endian support
   6  */
   7 #undef ntohl
   8 #undef ntohs
   9 #undef htonl
  10 #undef htons
  11 
  12 #if defined (__MIPSEL__)
  13 #define __LITTLE_ENDIAN
  14 #define __LITTLE_ENDIAN_BITFIELD
  15 #elif defined (__MIPSEB__)
  16 #define __BIG_ENDIAN
  17 #define __BIG_ENDIAN_BITFIELD
  18 #else
  19 #error "MIPS but neither __MIPSEL__ nor __MIPSEB__?"
  20 #endif
  21 
  22 extern unsigned long int        ntohl(unsigned long int);
  23 extern unsigned short int       ntohs(unsigned short int);
  24 extern unsigned long int        htonl(unsigned long int);
  25 extern unsigned short int       htons(unsigned short int);
  26 
  27 extern __inline__ unsigned long int     __ntohl(unsigned long int);
  28 extern __inline__ unsigned short int    __ntohs(unsigned short int);
  29 extern __inline__ unsigned long int     __constant_ntohl(unsigned long int);
  30 extern __inline__ unsigned short int    __constant_ntohs(unsigned short int);
  31 
  32 /*
  33  * The constant and non-constant versions here are the same.
  34  * Maybe I'll come up with an mips-optimized routine for the
  35  * non-constant ones (the constant ones don't need it: gcc
  36  * will optimize it to the correct constant).  Oh, and the
  37  * big endian routines that are still missing will be fairly
  38  * easy to write :-)
  39  */
  40 
  41 extern __inline__ unsigned long int
  42 __ntohl(unsigned long int x)
     /*  */
  43 {
  44         return (((x & 0x000000ffU) << 24) |
  45                 ((x & 0x0000ff00U) <<  8) |
  46                 ((x & 0x00ff0000U) >>  8) |
  47                 ((x & 0xff000000U) >> 24));
  48 }
  49 
  50 #define __constant_ntohl(x) \
  51         ((unsigned long int)((((unsigned long int)(x) & 0x000000ffU) << 24) | \
  52                              (((unsigned long int)(x) & 0x0000ff00U) <<  8) | \
  53                              (((unsigned long int)(x) & 0x00ff0000U) >>  8) | \
  54                              (((unsigned long int)(x) & 0xff000000U) >> 24)))
  55 
  56 extern __inline__ unsigned short int
  57 __ntohs(unsigned short int x)
     /*  */
  58 {
  59         return (((x & 0x00ff) << 8) |
  60                 ((x & 0xff00) >> 8));
  61 }
  62 
  63 #define __constant_ntohs(x) \
  64         ((unsigned short int)((((unsigned short int)(x) & 0x00ff) << 8) | \
  65                               (((unsigned short int)(x) & 0xff00) >> 8))) \
  66 
  67 #define __htonl(x) __ntohl(x)
  68 #define __htons(x) __ntohs(x)
  69 #define __constant_htonl(x) __constant_ntohl(x)
  70 #define __constant_htons(x) __constant_ntohs(x)
  71 
  72 #ifdef  __OPTIMIZE__
  73 #  define ntohl(x) \
  74 (__builtin_constant_p((long)(x)) ? \
  75  __constant_ntohl((x)) : \
  76  __ntohl((x)))
  77 #  define ntohs(x) \
  78 (__builtin_constant_p((short)(x)) ? \
  79  __constant_ntohs((x)) : \
  80  __ntohs((x)))
  81 #  define htonl(x) \
  82 (__builtin_constant_p((long)(x)) ? \
  83  __constant_htonl((x)) : \
  84  __htonl((x)))
  85 #  define htons(x) \
  86 (__builtin_constant_p((short)(x)) ? \
  87  __constant_htons((x)) : \
  88  __htons((x)))
  89 #endif
  90 
  91 #endif /* __ASM_MIPS_BYTEORDER_H */

/* */