#ifndef _LINUX_SWAB_H #define _LINUX_SWAB_H #include #include #include /* * casts are necessary for constants, because we never know how for sure * how U/UL/ULL map to uint16_t, uint32_t, uint64_t. At least not in a portable way. */ #define ___constant_swab16(x) ((uint16_t)( \ (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) | \ (((uint16_t)(x) & (uint16_t)0xff00U) >> 8))) #define ___constant_swab32(x) ((uint32_t)( \ (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \ (((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \ (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \ (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24))) #define ___constant_swab64(x) ((uint64_t)( \ (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \ (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \ (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \ (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \ (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \ (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \ (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \ (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56))) #define ___constant_swahw32(x) ((uint32_t)( \ (((uint32_t)(x) & (uint32_t)0x0000ffffUL) << 16) | \ (((uint32_t)(x) & (uint32_t)0xffff0000UL) >> 16))) #define ___constant_swahb32(x) ((uint32_t)( \ (((uint32_t)(x) & (uint32_t)0x00ff00ffUL) << 8) | \ (((uint32_t)(x) & (uint32_t)0xff00ff00UL) >> 8))) /* * Implement the following as inlines, but define the interface using * macros to allow constant folding when possible: * ___swab16, ___swab32, ___swab64, ___swahw32, ___swahb32 */ static inline __attribute_const__ uint16_t __fswab16(uint16_t val) { #ifdef __arch_swab16 return __arch_swab16(val); #else return ___constant_swab16(val); #endif } static inline __attribute_const__ uint32_t __fswab32(uint32_t val) { #ifdef __arch_swab32 return __arch_swab32(val); #else return ___constant_swab32(val); #endif } static inline __attribute_const__ uint64_t __fswab64(uint64_t val) { #ifdef __arch_swab64 return __arch_swab64(val); #elif defined(__SWAB_64_THRU_32__) uint32_t h = val >> 32; uint32_t l = val & ((1ULL << 32) - 1); return (((uint64_t)__fswab32(l)) << 32) | ((uint64_t)(__fswab32(h))); #else return ___constant_swab64(val); #endif } static inline __attribute_const__ uint32_t __fswahw32(uint32_t val) { #ifdef __arch_swahw32 return __arch_swahw32(val); #else return ___constant_swahw32(val); #endif } static inline __attribute_const__ uint32_t __fswahb32(uint32_t val) { #ifdef __arch_swahb32 return __arch_swahb32(val); #else return ___constant_swahb32(val); #endif } /** * __swab16 - return a byteswapped 16-bit value * @x: value to byteswap */ #define __swab16(x) \ (__builtin_constant_p((uint16_t)(x)) ? \ ___constant_swab16(x) : \ __fswab16(x)) /** * __swab32 - return a byteswapped 32-bit value * @x: value to byteswap */ #define __swab32(x) \ (__builtin_constant_p((uint32_t)(x)) ? \ ___constant_swab32(x) : \ __fswab32(x)) /** * __swab64 - return a byteswapped 64-bit value * @x: value to byteswap */ #define __swab64(x) \ (__builtin_constant_p((uint64_t)(x)) ? \ ___constant_swab64(x) : \ __fswab64(x)) /** * __swahw32 - return a word-swapped 32-bit value * @x: value to wordswap * * __swahw32(0x12340000) is 0x00001234 */ #define __swahw32(x) \ (__builtin_constant_p((uint32_t)(x)) ? \ ___constant_swahw32(x) : \ __fswahw32(x)) /** * __swahb32 - return a high and low byte-swapped 32-bit value * @x: value to byteswap * * __swahb32(0x12345678) is 0x34127856 */ #define __swahb32(x) \ (__builtin_constant_p((uint32_t)(x)) ? \ ___constant_swahb32(x) : \ __fswahb32(x)) /** * __swab16p - return a byteswapped 16-bit value from a pointer * @p: pointer to a naturally-aligned 16-bit value */ static inline uint16_t __swab16p(const uint16_t *p) { #ifdef __arch_swab16p return __arch_swab16p(p); #else return __swab16(*p); #endif } /** * __swab32p - return a byteswapped 32-bit value from a pointer * @p: pointer to a naturally-aligned 32-bit value */ static inline uint32_t __swab32p(const uint32_t *p) { #ifdef __arch_swab32p return __arch_swab32p(p); #else return __swab32(*p); #endif } /** * __swab64p - return a byteswapped 64-bit value from a pointer * @p: pointer to a naturally-aligned 64-bit value */ static inline uint64_t __swab64p(const uint64_t *p) { #ifdef __arch_swab64p return __arch_swab64p(p); #else return __swab64(*p); #endif } /** * __swahw32p - return a wordswapped 32-bit value from a pointer * @p: pointer to a naturally-aligned 32-bit value * * See __swahw32() for details of wordswapping. */ static inline uint32_t __swahw32p(const uint32_t *p) { #ifdef __arch_swahw32p return __arch_swahw32p(p); #else return __swahw32(*p); #endif } /** * __swahb32p - return a high and low byteswapped 32-bit value from a pointer * @p: pointer to a naturally-aligned 32-bit value * * See __swahb32() for details of high/low byteswapping. */ static inline uint32_t __swahb32p(const uint32_t *p) { #ifdef __arch_swahb32p return __arch_swahb32p(p); #else return __swahb32(*p); #endif } /** * __swab16s - byteswap a 16-bit value in-place * @p: pointer to a naturally-aligned 16-bit value */ static inline void __swab16s(uint16_t *p) { #ifdef __arch_swab16s __arch_swab16s(p); #else *p = __swab16p(p); #endif } /** * __swab32s - byteswap a 32-bit value in-place * @p: pointer to a naturally-aligned 32-bit value */ static inline void __swab32s(uint32_t *p) { #ifdef __arch_swab32s __arch_swab32s(p); #else *p = __swab32p(p); #endif } /** * __swab64s - byteswap a 64-bit value in-place * @p: pointer to a naturally-aligned 64-bit value */ static inline void __swab64s(uint64_t *p) { #ifdef __arch_swab64s __arch_swab64s(p); #else *p = __swab64p(p); #endif } /** * __swahw32s - wordswap a 32-bit value in-place * @p: pointer to a naturally-aligned 32-bit value * * See __swahw32() for details of wordswapping */ static inline void __swahw32s(uint32_t *p) { #ifdef __arch_swahw32s __arch_swahw32s(p); #else *p = __swahw32p(p); #endif } /** * __swahb32s - high and low byteswap a 32-bit value in-place * @p: pointer to a naturally-aligned 32-bit value * * See __swahb32() for details of high and low byte swapping */ static inline void __swahb32s(uint32_t *p) { #ifdef __arch_swahb32s __arch_swahb32s(p); #else *p = __swahb32p(p); #endif } # define swab16 __swab16 # define swab32 __swab32 # define swab64 __swab64 # define swahw32 __swahw32 # define swahb32 __swahb32 # define swab16p __swab16p # define swab32p __swab32p # define swab64p __swab64p # define swahw32p __swahw32p # define swahb32p __swahb32p # define swab16s __swab16s # define swab32s __swab32s # define swab64s __swab64s # define swahw32s __swahw32s # define swahb32s __swahb32s #endif /* _LINUX_SWAB_H */