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#ifndef _I386_BYTEORDER_H #define _I386_BYTEORDER_H #include <asm/types.h> #include <linux/compiler.h> #ifdef __GNUC__ /* For avoiding bswap on i386 */ #ifdef __KERNEL__ #include <linux/config.h> #else #define CONFIG_X86_BSWAP #endif static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x) { #ifdef CONFIG_X86_BSWAP __asm__("bswap %0" : "=r" (x) : "0" (x)); #else __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */ "rorl $16,%0\n\t" /* swap words */ "xchgb %b0,%h0" /* swap higher bytes */ :"=q" (x) : "0" (x)); #endif return x; } static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 val) { union { struct { __u32 a,b; } s; __u64 u; } v; v.u = val; #ifdef CONFIG_X86_BSWAP __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b)); #else v.s.a = ___arch__swab32(v.s.a); v.s.b = ___arch__swab32(v.s.b); __asm__("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b)); #endif return v.u; } /* Do not define swab16. Gcc is smart enough to recognize "C" version and convert it into rotation or exhange. */ #define __arch__swab64(x) ___arch__swab64(x) #define __arch__swab32(x) ___arch__swab32(x) #define __BYTEORDER_HAS_U64__ #endif /* __GNUC__ */ #include <linux/byteorder/little_endian.h> #endif /* _I386_BYTEORDER_H */