1#ifndef _ASM_X86_SWAB_H 2#define _ASM_X86_SWAB_H 3 4#include <linux/types.h> 5#include <linux/compiler.h> 6 7static inline __attribute_const__ __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 29static inline __attribute_const__ __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