1 #ifndef _I386_BYTEORDER_H 2 #define _I386_BYTEORDER_H 3 4 //#include "types.h" 5 #include "compiler.h" 6 7 #ifdef __GNUC__ 8 9 /* For avoiding bswap on i386 */ 10 //#ifdef __KERNEL__ 11 //#include <linux/config.h> 12 //#endif 13 14 static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x) 15 { 16 #ifdef CONFIG_X86_BSWAP 17 __asm__("bswap %0" : "=r" (x) : "0" (x)); 18 #else 19 __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */ 20 "rorl $16,%0\n\t" /* swap words */ 21 "xchgb %b0,%h0" /* swap higher bytes */ 22 :"=q" (x) 23 : "0" (x)); 24 #endif 25 return x; 26 } 27 28 static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 val) 29 { 30 union { 31 struct { __u32 a,b; } s; 32 __u64 u; 33 } v; 34 v.u = val; 35 #ifdef CONFIG_X86_BSWAP 36 asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1" 37 : "=r" (v.s.a), "=r" (v.s.b) 38 : "0" (v.s.a), "1" (v.s.b)); 39 #else 40 v.s.a = ___arch__swab32(v.s.a); 41 v.s.b = ___arch__swab32(v.s.b); 42 asm("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b)); 43 #endif 44 return v.u; 45 } 46 47 /* Do not define swab16. Gcc is smart enough to recognize "C" version and 48 convert it into rotation or exhange. */ 49 50 #define __arch__swab64(x) ___arch__swab64(x) 51 #define __arch__swab32(x) ___arch__swab32(x) 52 53 #define __BYTEORDER_HAS_U64__ 54 55 #endif /* __GNUC__ */ 56 57 //#include "little_endian.h" 58 59 #endif /* _I386_BYTEORDER_H */ 60