arch/x86/include/uapi/asm/swab.h

   1 #ifndef _ASM_X86_SWAB_H
   2 #define _ASM_X86_SWAB_H
   3
   4 #include <linux/types.h>
   5 #include <linux/compiler.h>
   6
   7 static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
   8 {
   9         asm("bswapl %0" : "=r" (val) : "0" (val));
  10         return val;
  11 }
  12 #define __arch_swab32 __arch_swab32
  13
  14 static inline __attribute_const__ __u64 __arch_swab64(__u64 val)
  15 {
  16 #ifdef __i386__
  17         union {
  18                 struct {
  19                         __u32 a;
  20                         __u32 b;
  21                 } s;
  22                 __u64 u;
  23         } v;
  24         v.u = val;
  25         asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
  26             : "=r" (v.s.a), "=r" (v.s.b)
  27             : "0" (v.s.a), "1" (v.s.b));
  28         return v.u;
  29 #else /* __i386__ */
  30         asm("bswapq %0" : "=r" (val) : "0" (val));
  31         return val;
  32 #endif
  33 }
  34 #define __arch_swab64 __arch_swab64
  35
  36 #endif /* _ASM_X86_SWAB_H */