1*b15cbc0bSwdenk #ifndef _LINUX_BYTEORDER_SWAB_H 2*b15cbc0bSwdenk #define _LINUX_BYTEORDER_SWAB_H 3*b15cbc0bSwdenk 4*b15cbc0bSwdenk /* 5*b15cbc0bSwdenk * linux/byteorder/swab.h 6*b15cbc0bSwdenk * Byte-swapping, independently from CPU endianness 7*b15cbc0bSwdenk * swabXX[ps]?(foo) 8*b15cbc0bSwdenk * 9*b15cbc0bSwdenk * Francois-Rene Rideau <fare@tunes.org> 19971205 10*b15cbc0bSwdenk * separated swab functions from cpu_to_XX, 11*b15cbc0bSwdenk * to clean up support for bizarre-endian architectures. 12*b15cbc0bSwdenk * 13*b15cbc0bSwdenk * See asm-i386/byteorder.h and suches for examples of how to provide 14*b15cbc0bSwdenk * architecture-dependent optimized versions 15*b15cbc0bSwdenk * 16*b15cbc0bSwdenk */ 17*b15cbc0bSwdenk 18*b15cbc0bSwdenk /* casts are necessary for constants, because we never know how for sure 19*b15cbc0bSwdenk * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. 20*b15cbc0bSwdenk */ 21*b15cbc0bSwdenk #define ___swab16(x) \ 22*b15cbc0bSwdenk ((__u16)( \ 23*b15cbc0bSwdenk (((__u16)(x) & (__u16)0x00ffU) << 8) | \ 24*b15cbc0bSwdenk (((__u16)(x) & (__u16)0xff00U) >> 8) )) 25*b15cbc0bSwdenk #define ___swab32(x) \ 26*b15cbc0bSwdenk ((__u32)( \ 27*b15cbc0bSwdenk (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ 28*b15cbc0bSwdenk (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ 29*b15cbc0bSwdenk (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ 30*b15cbc0bSwdenk (((__u32)(x) & (__u32)0xff000000UL) >> 24) )) 31*b15cbc0bSwdenk #define ___swab64(x) \ 32*b15cbc0bSwdenk ((__u64)( \ 33*b15cbc0bSwdenk (__u64)(((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \ 34*b15cbc0bSwdenk (__u64)(((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \ 35*b15cbc0bSwdenk (__u64)(((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \ 36*b15cbc0bSwdenk (__u64)(((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \ 37*b15cbc0bSwdenk (__u64)(((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \ 38*b15cbc0bSwdenk (__u64)(((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \ 39*b15cbc0bSwdenk (__u64)(((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \ 40*b15cbc0bSwdenk (__u64)(((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56) )) 41*b15cbc0bSwdenk 42*b15cbc0bSwdenk /* 43*b15cbc0bSwdenk * provide defaults when no architecture-specific optimization is detected 44*b15cbc0bSwdenk */ 45*b15cbc0bSwdenk #ifndef __arch__swab16 46*b15cbc0bSwdenk # define __arch__swab16(x) ___swab16(x) 47*b15cbc0bSwdenk #endif 48*b15cbc0bSwdenk #ifndef __arch__swab32 49*b15cbc0bSwdenk # define __arch__swab32(x) ___swab32(x) 50*b15cbc0bSwdenk #endif 51*b15cbc0bSwdenk #ifndef __arch__swab64 52*b15cbc0bSwdenk # define __arch__swab64(x) ___swab64(x) 53*b15cbc0bSwdenk #endif 54*b15cbc0bSwdenk 55*b15cbc0bSwdenk #ifndef __arch__swab16p 56*b15cbc0bSwdenk # define __arch__swab16p(x) __swab16(*(x)) 57*b15cbc0bSwdenk #endif 58*b15cbc0bSwdenk #ifndef __arch__swab32p 59*b15cbc0bSwdenk # define __arch__swab32p(x) __swab32(*(x)) 60*b15cbc0bSwdenk #endif 61*b15cbc0bSwdenk #ifndef __arch__swab64p 62*b15cbc0bSwdenk # define __arch__swab64p(x) __swab64(*(x)) 63*b15cbc0bSwdenk #endif 64*b15cbc0bSwdenk 65*b15cbc0bSwdenk #ifndef __arch__swab16s 66*b15cbc0bSwdenk # define __arch__swab16s(x) do { *(x) = __swab16p((x)); } while (0) 67*b15cbc0bSwdenk #endif 68*b15cbc0bSwdenk #ifndef __arch__swab32s 69*b15cbc0bSwdenk # define __arch__swab32s(x) do { *(x) = __swab32p((x)); } while (0) 70*b15cbc0bSwdenk #endif 71*b15cbc0bSwdenk #ifndef __arch__swab64s 72*b15cbc0bSwdenk # define __arch__swab64s(x) do { *(x) = __swab64p((x)); } while (0) 73*b15cbc0bSwdenk #endif 74*b15cbc0bSwdenk 75*b15cbc0bSwdenk 76*b15cbc0bSwdenk /* 77*b15cbc0bSwdenk * Allow constant folding 78*b15cbc0bSwdenk */ 79*b15cbc0bSwdenk #if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__) 80*b15cbc0bSwdenk # define __swab16(x) \ 81*b15cbc0bSwdenk (__builtin_constant_p((__u16)(x)) ? \ 82*b15cbc0bSwdenk ___swab16((x)) : \ 83*b15cbc0bSwdenk __fswab16((x))) 84*b15cbc0bSwdenk # define __swab32(x) \ 85*b15cbc0bSwdenk (__builtin_constant_p((__u32)(x)) ? \ 86*b15cbc0bSwdenk ___swab32((x)) : \ 87*b15cbc0bSwdenk __fswab32((x))) 88*b15cbc0bSwdenk # define __swab64(x) \ 89*b15cbc0bSwdenk (__builtin_constant_p((__u64)(x)) ? \ 90*b15cbc0bSwdenk ___swab64((x)) : \ 91*b15cbc0bSwdenk __fswab64((x))) 92*b15cbc0bSwdenk #else 93*b15cbc0bSwdenk # define __swab16(x) __fswab16(x) 94*b15cbc0bSwdenk # define __swab32(x) __fswab32(x) 95*b15cbc0bSwdenk # define __swab64(x) __fswab64(x) 96*b15cbc0bSwdenk #endif /* OPTIMIZE */ 97*b15cbc0bSwdenk 98*b15cbc0bSwdenk 99*b15cbc0bSwdenk extern __inline__ __const__ __u16 __fswab16(__u16 x) 100*b15cbc0bSwdenk { 101*b15cbc0bSwdenk return __arch__swab16(x); 102*b15cbc0bSwdenk } 103*b15cbc0bSwdenk extern __inline__ __u16 __swab16p(__u16 *x) 104*b15cbc0bSwdenk { 105*b15cbc0bSwdenk return __arch__swab16p(x); 106*b15cbc0bSwdenk } 107*b15cbc0bSwdenk extern __inline__ void __swab16s(__u16 *addr) 108*b15cbc0bSwdenk { 109*b15cbc0bSwdenk __arch__swab16s(addr); 110*b15cbc0bSwdenk } 111*b15cbc0bSwdenk 112*b15cbc0bSwdenk extern __inline__ __const__ __u32 __fswab32(__u32 x) 113*b15cbc0bSwdenk { 114*b15cbc0bSwdenk return __arch__swab32(x); 115*b15cbc0bSwdenk } 116*b15cbc0bSwdenk extern __inline__ __u32 __swab32p(__u32 *x) 117*b15cbc0bSwdenk { 118*b15cbc0bSwdenk return __arch__swab32p(x); 119*b15cbc0bSwdenk } 120*b15cbc0bSwdenk extern __inline__ void __swab32s(__u32 *addr) 121*b15cbc0bSwdenk { 122*b15cbc0bSwdenk __arch__swab32s(addr); 123*b15cbc0bSwdenk } 124*b15cbc0bSwdenk 125*b15cbc0bSwdenk #ifdef __BYTEORDER_HAS_U64__ 126*b15cbc0bSwdenk extern __inline__ __const__ __u64 __fswab64(__u64 x) 127*b15cbc0bSwdenk { 128*b15cbc0bSwdenk # ifdef __SWAB_64_THRU_32__ 129*b15cbc0bSwdenk __u32 h = x >> 32; 130*b15cbc0bSwdenk __u32 l = x & ((1ULL<<32)-1); 131*b15cbc0bSwdenk return (((__u64)__swab32(l)) << 32) | ((__u64)(__swab32(h))); 132*b15cbc0bSwdenk # else 133*b15cbc0bSwdenk return __arch__swab64(x); 134*b15cbc0bSwdenk # endif 135*b15cbc0bSwdenk } 136*b15cbc0bSwdenk extern __inline__ __u64 __swab64p(__u64 *x) 137*b15cbc0bSwdenk { 138*b15cbc0bSwdenk return __arch__swab64p(x); 139*b15cbc0bSwdenk } 140*b15cbc0bSwdenk extern __inline__ void __swab64s(__u64 *addr) 141*b15cbc0bSwdenk { 142*b15cbc0bSwdenk __arch__swab64s(addr); 143*b15cbc0bSwdenk } 144*b15cbc0bSwdenk #endif /* __BYTEORDER_HAS_U64__ */ 145*b15cbc0bSwdenk 146*b15cbc0bSwdenk #if defined(__KERNEL__) 147*b15cbc0bSwdenk #define swab16 __swab16 148*b15cbc0bSwdenk #define swab32 __swab32 149*b15cbc0bSwdenk #define swab64 __swab64 150*b15cbc0bSwdenk #define swab16p __swab16p 151*b15cbc0bSwdenk #define swab32p __swab32p 152*b15cbc0bSwdenk #define swab64p __swab64p 153*b15cbc0bSwdenk #define swab16s __swab16s 154*b15cbc0bSwdenk #define swab32s __swab32s 155*b15cbc0bSwdenk #define swab64s __swab64s 156*b15cbc0bSwdenk #endif 157*b15cbc0bSwdenk 158*b15cbc0bSwdenk #endif /* _LINUX_BYTEORDER_SWAB_H */ 159