1#ifndef _ASM_X86_BYTEORDER_H 2#define _ASM_X86_BYTEORDER_H 3 4#include <asm/types.h> 5 6#ifdef __GNUC__ 7 8#ifdef __i386__ 9 10static __inline__ __u32 ___arch__swab32(__u32 x) 11{ 12#ifdef CONFIG_X86_BSWAP 13 __asm__("bswap %0" : "=r" (x) : "0" (x)); 14#else 15 __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */ 16 "rorl $16,%0\n\t" /* swap words */ 17 "xchgb %b0,%h0" /* swap higher bytes */ 18 :"=q" (x) 19 : "0" (x)); 20#endif 21 return x; 22} 23 24static __inline__ __u64 ___arch__swab64(__u64 val) 25{ 26 union { 27 struct { __u32 a,b; } s; 28 __u64 u; 29 } v; 30 v.u = val; 31#ifdef CONFIG_X86_BSWAP 32 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1" 33 : "=r" (v.s.a), "=r" (v.s.b) 34 : "0" (v.s.a), "1" (v.s.b)); 35#else 36 v.s.a = ___arch__swab32(v.s.a); 37 v.s.b = ___arch__swab32(v.s.b); 38 __asm__("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b)); 39#endif 40 return v.u; 41} 42 43#else /* __i386__ */ 44 45static __inline__ __u64 ___arch__swab64(__u64 x) 46{ 47 __asm__("bswapq %0" : "=r" (x) : "0" (x)); 48 return x; 49} 50 51static __inline__ __u32 ___arch__swab32(__u32 x) 52{ 53 __asm__("bswapl %0" : "=r" (x) : "0" (x)); 54 return x; 55} 56 57#endif 58 59/* Do not define swab16. Gcc is smart enough to recognize "C" version and 60 convert it into rotation or exhange. */ 61 62#define __arch__swab64(x) ___arch__swab64(x) 63#define __arch__swab32(x) ___arch__swab32(x) 64 65#define __BYTEORDER_HAS_U64__ 66 67#endif /* __GNUC__ */ 68 69#include <linux/byteorder/little_endian.h> 70 71#endif /* _ASM_X86_BYTEORDER_H */ 72