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422 giacomo 1
#ifndef _I386_BYTEORDER_H
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#define _I386_BYTEORDER_H
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#include <asm/types.h>
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#ifdef __GNUC__
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/* For avoiding bswap on i386 */
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#ifdef __KERNEL__
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#include <linux/config.h>
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#endif
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static __inline__ __attribute__((const)) __u32 ___arch__swab32(__u32 x)
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{
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#ifdef CONFIG_X86_BSWAP
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        __asm__("bswap %0" : "=r" (x) : "0" (x));
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#else
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        __asm__("xchgb %b0,%h0\n\t"     /* swap lower bytes     */
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                "rorl $16,%0\n\t"       /* swap words           */
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                "xchgb %b0,%h0"         /* swap higher bytes    */
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                :"=q" (x)
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                : "0" (x));
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#endif
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        return x;
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}
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/* gcc should generate this for open coded C now too. May be worth switching to
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   it because inline assembly cannot be scheduled. -AK */
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static __inline__ __attribute__((const)) __u16 ___arch__swab16(__u16 x)
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{
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        __asm__("xchgb %b0,%h0"         /* swap bytes           */
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                : "=q" (x)
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                :  "0" (x));
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                return x;
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}
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static inline __u64 ___arch__swab64(__u64 val)
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{
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        union {
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                struct { __u32 a,b; } s;
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                __u64 u;
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        } v;
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        v.u = val;
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#ifdef CONFIG_X86_BSWAP
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        asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
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            : "=r" (v.s.a), "=r" (v.s.b)
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            : "0" (v.s.a), "1" (v.s.b));
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#else
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   v.s.a = ___arch__swab32(v.s.a);
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        v.s.b = ___arch__swab32(v.s.b);
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        asm("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b));
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#endif
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        return v.u;    
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}
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#define __arch__swab64(x) ___arch__swab64(x)
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#define __arch__swab32(x) ___arch__swab32(x)
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#define __arch__swab16(x) ___arch__swab16(x)
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#define __BYTEORDER_HAS_U64__
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#endif /* __GNUC__ */
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#include <linux/byteorder/little_endian.h>
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#endif /* _I386_BYTEORDER_H */