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

INCLUDED FROM

DEFINITIONS

1. __arch_swab32
2. __arch_swab64

#ifndef _ASM_X86_SWAB_H
#define _ASM_X86_SWAB_H

#include <linux/types.h>
#include <linux/compiler.h>

static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
{
        asm("bswapl %0" : "=r" (val) : "0" (val));
        return val;
}
#define __arch_swab32 __arch_swab32

static inline __attribute_const__ __u64 __arch_swab64(__u64 val)
{
#ifdef __i386__
        union {
                struct {
                        __u32 a;
                        __u32 b;
                } s;
                __u64 u;
        } v;
        v.u = val;
        asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
            : "=r" (v.s.a), "=r" (v.s.b)
            : "0" (v.s.a), "1" (v.s.b));
        return v.u;
#else /* __i386__ */
        asm("bswapq %0" : "=r" (val) : "0" (val));
        return val;
#endif
}
#define __arch_swab64 __arch_swab64

#endif /* _ASM_X86_SWAB_H */