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Linux Cross Reference
Linux/include/asm-i386/byteorder.h

Version: ~ [ 2.4.0 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~ 
  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) : "" (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                 : "" (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                 :  "" (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
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