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00001 #ifndef _I386_BYTEORDER_H
00002 #define _I386_BYTEORDER_H
00003 
00004 //#include "types.h"
00005 #include "compiler.h"
00006 
00007 #ifdef __GNUC__
00008 
00009 /* For avoiding bswap on i386 */
00010 //#ifdef __KERNEL__
00011 //#include <linux/config.h>
00012 //#endif
00013 
00014 static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
00015 {
00016 #ifdef CONFIG_X86_BSWAP
00017     __asm__("bswap %0" : "=r" (x) : "0" (x));
00018 #else
00019     __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */
00020         "rorl $16,%0\n\t"   /* swap words       */
00021         "xchgb %b0,%h0"     /* swap higher bytes    */
00022         :"=q" (x)
00023         : "0" (x));
00024 #endif
00025     return x;
00026 }
00027 
00028 static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 val)
00029 {
00030     union {
00031         struct { __u32 a,b; } s;
00032         __u64 u;
00033     } v;
00034     v.u = val;
00035 #ifdef CONFIG_X86_BSWAP
00036     asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
00037         : "=r" (v.s.a), "=r" (v.s.b)
00038         : "0" (v.s.a), "1" (v.s.b));
00039 #else
00040    v.s.a = ___arch__swab32(v.s.a);
00041     v.s.b = ___arch__swab32(v.s.b);
00042     asm("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b));
00043 #endif
00044     return v.u;
00045 }
00046 
00047 /* Do not define swab16.  Gcc is smart enough to recognize "C" version and
00048    convert it into rotation or exhange.  */
00049 
00050 #define __arch__swab64(x) ___arch__swab64(x)
00051 #define __arch__swab32(x) ___arch__swab32(x)
00052 
00053 #define __BYTEORDER_HAS_U64__
00054 
00055 #endif /* __GNUC__ */
00056 
00057 //#include "little_endian.h"
00058 
00059 #endif /* _I386_BYTEORDER_H */
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