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