1 #ifndef _ASM_X86_SWAB_H 2 #define _ASM_X86_SWAB_H 3 4 #include <linux/types.h> 5 6 7 static __inline__ __u32 __arch_swab32(__u32 val) 8 { 9 #ifdef __i386__ 10 # ifdef CONFIG_X86_BSWAP 11 __asm__("bswap %0" : "=r" (val) : "0" (val)); 12 # else 13 __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */ 14 "rorl $16,%0\n\t" /* swap words */ 15 "xchgb %b0,%h0" /* swap higher bytes */ 16 : "=q" (val) 17 : "0" (val)); 18 # endif 19 20 #else /* __i386__ */ 21 __asm__("bswapl %0" 22 : "=r" (val) 23 : "0" (val)); 24 #endif 25 return val; 26 } 27 #define __arch_swab32 __arch_swab32 28 29 static __inline__ __u64 __arch_swab64(__u64 val) 30 { 31 #ifdef __i386__ 32 union { 33 struct { 34 __u32 a; 35 __u32 b; 36 } s; 37 __u64 u; 38 } v; 39 v.u = val; 40 # ifdef CONFIG_X86_BSWAP 41 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1" 42 : "=r" (v.s.a), "=r" (v.s.b) 43 : "0" (v.s.a), "1" (v.s.b)); 44 # else 45 v.s.a = __arch_swab32(v.s.a); 46 v.s.b = __arch_swab32(v.s.b); 47 __asm__("xchgl %0,%1" 48 : "=r" (v.s.a), "=r" (v.s.b) 49 : "0" (v.s.a), "1" (v.s.b)); 50 # endif 51 return v.u; 52 #else /* __i386__ */ 53 __asm__("bswapq %0" 54 : "=r" (val) 55 : "0" (val)); 56 return val; 57 #endif 58 } 59 #define __arch_swab64 __arch_swab64 60 61 #endif /* _ASM_X86_SWAB_H */ 62
