| #ifndef _LINUX_SWAB_H | |
| #define _LINUX_SWAB_H | |
| #include <linux/types.h> | |
| #include <linux/compiler.h> | |
| #include <asm/byteorder.h> | |
| /* | |
| * casts are necessary for constants, because we never know how for sure | |
| * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. | |
| */ | |
| #define __const_swab16(x) ((__u16)( \ | |
| (((__u16)(x) & (__u16)0x00ffU) << 8) | \ | |
| (((__u16)(x) & (__u16)0xff00U) >> 8))) | |
| #define __const_swab32(x) ((__u32)( \ | |
| (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ | |
| (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ | |
| (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ | |
| (((__u32)(x) & (__u32)0xff000000UL) >> 24))) | |
| #define __const_swab64(x) ((__u64)( \ | |
| (((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \ | |
| (((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \ | |
| (((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \ | |
| (((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \ | |
| (((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \ | |
| (((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \ | |
| (((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \ | |
| (((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56))) | |
| #define __const_swahw32(x) ((__u32)( \ | |
| (((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \ | |
| (((__u32)(x) & (__u32)0xffff0000UL) >> 16))) | |
| #define __const_swahb32(x) ((__u32)( \ | |
| (((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \ | |
| (((__u32)(x) & (__u32)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__ __u16 ___swab16(__u16 val) | |
| { | |
| #ifdef __arch_swab16 | |
| return __arch_swab16(val); | |
| #else | |
| return __const_swab16(val); | |
| #endif | |
| } | |
| static inline __attribute_const__ __u32 ___swab32(__u32 val) | |
| { | |
| #ifdef __arch_swab32 | |
| return __arch_swab32(val); | |
| #else | |
| return __const_swab32(val); | |
| #endif | |
| } | |
| static inline __attribute_const__ __u64 ___swab64(__u64 val) | |
| { | |
| #ifdef __arch_swab64 | |
| return __arch_swab64(val); | |
| #elif defined(__SWAB_64_THRU_32__) | |
| __u32 h = val >> 32; | |
| __u32 l = val & ((1ULL << 32) - 1); | |
| return (((__u64)___swab32(l)) << 32) | ((__u64)(___swab32(h))); | |
| #else | |
| return __const_swab64(val); | |
| #endif | |
| } | |
| static inline __attribute_const__ __u32 ___swahw32(__u32 val) | |
| { | |
| #ifdef __arch_swahw32 | |
| return __arch_swahw32(val); | |
| #else | |
| return __const_swahw32(val); | |
| #endif | |
| } | |
| static inline __attribute_const__ __u32 ___swahb32(__u32 val) | |
| { | |
| #ifdef __arch_swahb32 | |
| return __arch_swahb32(val); | |
| #else | |
| return __const_swahb32(val); | |
| #endif | |
| } | |
| /** | |
| * __swab16 - return a byteswapped 16-bit value | |
| * @x: value to byteswap | |
| */ | |
| #define __swab16(x) \ | |
| (__builtin_constant_p((__u16)(x)) ? \ | |
| __const_swab16((x)) : \ | |
| ___swab16((x))) | |
| /** | |
| * __swab32 - return a byteswapped 32-bit value | |
| * @x: value to byteswap | |
| */ | |
| #define __swab32(x) \ | |
| (__builtin_constant_p((__u32)(x)) ? \ | |
| __const_swab32((x)) : \ | |
| ___swab32((x))) | |
| /** | |
| * __swab64 - return a byteswapped 64-bit value | |
| * @x: value to byteswap | |
| */ | |
| #define __swab64(x) \ | |
| (__builtin_constant_p((__u64)(x)) ? \ | |
| __const_swab64((x)) : \ | |
| ___swab64((x))) | |
| /** | |
| * __swahw32 - return a word-swapped 32-bit value | |
| * @x: value to wordswap | |
| * | |
| * __swahw32(0x12340000) is 0x00001234 | |
| */ | |
| #define __swahw32(x) \ | |
| (__builtin_constant_p((__u32)(x)) ? \ | |
| __const_swahw32((x)) : \ | |
| ___swahw32((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((__u32)(x)) ? \ | |
| __const_swahb32((x)) : \ | |
| ___swahb32((x))) | |
| /** | |
| * __swab16p - return a byteswapped 16-bit value from a pointer | |
| * @p: pointer to a naturally-aligned 16-bit value | |
| */ | |
| static inline __u16 __swab16p(const __u16 *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 __u32 __swab32p(const __u32 *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 __u64 __swab64p(const __u64 *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 __u32 __swahw32p(const __u32 *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 __u32 __swahb32p(const __u32 *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(__u16 *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(__u32 *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(__u64 *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(__u32 *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(__u32 *p) | |
| { | |
| #ifdef __arch_swahb32s | |
| __arch_swahb32s(p); | |
| #else | |
| *p = __swahb32p(p); | |
| #endif | |
| } | |
| #ifdef __KERNEL__ | |
| # 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 /* __KERNEL__ */ | |
| #endif /* _LINUX_SWAB_H */ |