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 10 static __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 24 static __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 45 static __inline__ __u64 ___arch__swab64(__u64 x) 46 { 47 __asm__("bswapq %0" : "=r" (x) : "0" (x)); 48 return x; 49 } 50 51 static __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
