LXR linux/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
   7static 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
  14static 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 */
  37