i386/linux-2.3.21/include/asm-i386/byteorder.h

   1 #ifndef _I386_BYTEORDER_H
   2 #define _I386_BYTEORDER_H
   3
   4 #include <asm/types.h>
   5
   6 #ifdef __GNUC__
   7
   8 /* For avoiding bswap on i386 */
   9 #ifdef __KERNEL__
  10 #include <linux/config.h>
  11 #endif
  12
  13 static __inline__ __const__ __u32 ___arch__swab32(__u32 x)
  14 {
  15 #ifdef CONFIG_X86_BSWAP
  16         __asm__("bswap %0" : "=r" (x) : "0" (x));
  17 #else
  18         __asm__("xchgb %b0,%h0\n\t"     /* swap lower bytes     */
  19                 "rorl $16,%0\n\t"       /* swap words           */
  20                 "xchgb %b0,%h0"         /* swap higher bytes    */
  21                 :"=q" (x)
  22                 : "0" (x));
  23 #endif
  24         return x;
  25 }
  26
  27 static __inline__ __const__ __u16 ___arch__swab16(__u16 x)
  28 {
  29         __asm__("xchgb %b0,%h0"         /* swap bytes           */ \
  30                 : "=q" (x) \
  31                 :  "0" (x)); \
  32                 return x;
  33 }
  34
  35 #define __arch__swab32(x) ___arch__swab32(x)
  36 #define __arch__swab16(x) ___arch__swab16(x)
  37
  38 #if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
  39 #  define __BYTEORDER_HAS_U64__
  40 #  define __SWAB_64_THRU_32__
  41 #endif
  42
  43 #endif /* __GNUC__ */
  44
  45 #include <linux/byteorder/little_endian.h>
  46
  47 #endif /* _I386_BYTEORDER_H */