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Text File  |  1999-09-17  |  959b  |  48 lines
  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 */
  48.