1 #ifndef _ASM_X86_BYTEORDER_H 2 #define _ASM_X86_BYTEORDER_H 3 4 #include <asm/types.h> 5 #include <linux/compiler.h> 6 7 #ifdef __GNUC__ 8 9 #ifdef __i386__ 10 11 static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x) 12 { 13 #ifdef CONFIG_X86_BSWAP 14 __asm__("bswap %0" : "=r" (x) : "0" (x)); 15 #else 16 __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */ 17 "rorl $16,%0\n\t" /* swap words */ 18 "xchgb %b0,%h0" /* swap higher bytes */ 19 :"=q" (x) 20 : "0" (x)); 21 #endif 22 return x; 23 } 24 25 static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 val) 26 { 27 union { 28 struct { __u32 a,b; } s; 29 __u64 u; 30 } v; 31 v.u = val; 32 #ifdef CONFIG_X86_BSWAP 33 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1" 34 : "=r" (v.s.a), "=r" (v.s.b) 35 : "0" (v.s.a), "1" (v.s.b)); 36 #else 37 v.s.a = ___arch__swab32(v.s.a); 38 v.s.b = ___arch__swab32(v.s.b); 39 __asm__("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b)); 40 #endif 41 return v.u; 42 } 43 44 #else /* __i386__ */ 45 46 static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x) 47 { 48 __asm__("bswapq %0" : "=r" (x) : "0" (x)); 49 return x; 50 } 51 52 static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x) 53 { 54 __asm__("bswapl %0" : "=r" (x) : "0" (x)); 55 return x; 56 } 57 58 #endif 59 60 /* Do not define swab16. Gcc is smart enough to recognize "C" version and 61 convert it into rotation or exhange. */ 62 63 #define __arch__swab64(x) ___arch__swab64(x) 64 #define __arch__swab32(x) ___arch__swab32(x) 65 66 #define __BYTEORDER_HAS_U64__ 67 68 #endif /* __GNUC__ */ 69 70 #include <linux/byteorder/little_endian.h> 71 72 #endif /* _ASM_X86_BYTEORDER_H */ 73
