| #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 ___constant_swab16(x) ((__u16)( \ |
| (((__u16)(x) & (__u16)0x00ffU) << 8) | \ |
| (((__u16)(x) & (__u16)0xff00U) >> 8))) |
| |
| #define ___constant_swab32(x) ((__u32)( \ |
| (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ |
| (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ |
| (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ |
| (((__u32)(x) & (__u32)0xff000000UL) >> 24))) |
| |
| #define ___constant_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 ___constant_swahw32(x) ((__u32)( \ |
| (((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \ |
| (((__u32)(x) & (__u32)0xffff0000UL) >> 16))) |
| |
| #define ___constant_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 __fswab16(__u16 val) |
| { |
| #ifdef __arch_swab16 |
| return __arch_swab16(val); |
| #else |
| return ___constant_swab16(val); |
| #endif |
| } |
| |
| static inline __attribute_const__ __u32 __fswab32(__u32 val) |
| { |
| #ifdef __arch_swab32 |
| return __arch_swab32(val); |
| #else |
| return ___constant_swab32(val); |
| #endif |
| } |
| |
| static inline __attribute_const__ __u64 __fswab64(__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)__fswab32(l)) << 32) | ((__u64)(__fswab32(h))); |
| #else |
| return ___constant_swab64(val); |
| #endif |
| } |
| |
| static inline __attribute_const__ __u32 __fswahw32(__u32 val) |
| { |
| #ifdef __arch_swahw32 |
| return __arch_swahw32(val); |
| #else |
| return ___constant_swahw32(val); |
| #endif |
| } |
| |
| static inline __attribute_const__ __u32 __fswahb32(__u32 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((__u16)(x)) ? \ |
| ___constant_swab16(x) : \ |
| __fswab16(x)) |
| |
| /** |
| * __swab32 - return a byteswapped 32-bit value |
| * @x: value to byteswap |
| */ |
| #define __swab32(x) \ |
| (__builtin_constant_p((__u32)(x)) ? \ |
| ___constant_swab32(x) : \ |
| __fswab32(x)) |
| |
| /** |
| * __swab64 - return a byteswapped 64-bit value |
| * @x: value to byteswap |
| */ |
| #define __swab64(x) \ |
| (__builtin_constant_p((__u64)(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((__u32)(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((__u32)(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 __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 */ |