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305 lines
6.9 KiB
305 lines
6.9 KiB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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#ifndef _UAPI_LINUX_SWAB_H |
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#define _UAPI_LINUX_SWAB_H |
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#include <linux/types.h> |
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#include <linux/compiler.h> |
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#include <asm/bitsperlong.h> |
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#include <asm/swab.h> |
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/* |
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* casts are necessary for constants, because we never know how for sure |
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* how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. |
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*/ |
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#define ___constant_swab16(x) ((__u16)( \ |
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(((__u16)(x) & (__u16)0x00ffU) << 8) | \ |
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(((__u16)(x) & (__u16)0xff00U) >> 8))) |
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#define ___constant_swab32(x) ((__u32)( \ |
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(((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ |
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(((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ |
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(((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ |
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(((__u32)(x) & (__u32)0xff000000UL) >> 24))) |
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#define ___constant_swab64(x) ((__u64)( \ |
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(((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \ |
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(((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \ |
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(((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \ |
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(((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \ |
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(((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \ |
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(((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \ |
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(((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \ |
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(((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56))) |
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#define ___constant_swahw32(x) ((__u32)( \ |
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(((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \ |
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(((__u32)(x) & (__u32)0xffff0000UL) >> 16))) |
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#define ___constant_swahb32(x) ((__u32)( \ |
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(((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \ |
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(((__u32)(x) & (__u32)0xff00ff00UL) >> 8))) |
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/* |
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* Implement the following as inlines, but define the interface using |
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* macros to allow constant folding when possible: |
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* ___swab16, ___swab32, ___swab64, ___swahw32, ___swahb32 |
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*/ |
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static inline __attribute_const__ __u16 __fswab16(__u16 val) |
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{ |
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#if defined (__arch_swab16) |
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return __arch_swab16(val); |
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#else |
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return ___constant_swab16(val); |
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#endif |
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} |
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static inline __attribute_const__ __u32 __fswab32(__u32 val) |
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{ |
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#if defined(__arch_swab32) |
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return __arch_swab32(val); |
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#else |
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return ___constant_swab32(val); |
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#endif |
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} |
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static inline __attribute_const__ __u64 __fswab64(__u64 val) |
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{ |
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#if defined (__arch_swab64) |
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return __arch_swab64(val); |
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#elif defined(__SWAB_64_THRU_32__) |
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__u32 h = val >> 32; |
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__u32 l = val & ((1ULL << 32) - 1); |
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return (((__u64)__fswab32(l)) << 32) | ((__u64)(__fswab32(h))); |
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#else |
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return ___constant_swab64(val); |
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#endif |
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} |
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static inline __attribute_const__ __u32 __fswahw32(__u32 val) |
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{ |
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#ifdef __arch_swahw32 |
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return __arch_swahw32(val); |
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#else |
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return ___constant_swahw32(val); |
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#endif |
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} |
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static inline __attribute_const__ __u32 __fswahb32(__u32 val) |
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{ |
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#ifdef __arch_swahb32 |
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return __arch_swahb32(val); |
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#else |
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return ___constant_swahb32(val); |
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#endif |
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} |
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/** |
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* __swab16 - return a byteswapped 16-bit value |
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* @x: value to byteswap |
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*/ |
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#ifdef __HAVE_BUILTIN_BSWAP16__ |
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#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) |
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#else |
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#define __swab16(x) \ |
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(__builtin_constant_p((__u16)(x)) ? \ |
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___constant_swab16(x) : \ |
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__fswab16(x)) |
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#endif |
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/** |
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* __swab32 - return a byteswapped 32-bit value |
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* @x: value to byteswap |
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*/ |
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#ifdef __HAVE_BUILTIN_BSWAP32__ |
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#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x)) |
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#else |
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#define __swab32(x) \ |
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(__builtin_constant_p((__u32)(x)) ? \ |
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___constant_swab32(x) : \ |
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__fswab32(x)) |
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#endif |
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/** |
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* __swab64 - return a byteswapped 64-bit value |
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* @x: value to byteswap |
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*/ |
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#ifdef __HAVE_BUILTIN_BSWAP64__ |
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#define __swab64(x) (__u64)__builtin_bswap64((__u64)(x)) |
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#else |
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#define __swab64(x) \ |
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(__builtin_constant_p((__u64)(x)) ? \ |
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___constant_swab64(x) : \ |
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__fswab64(x)) |
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#endif |
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static __always_inline unsigned long __swab(const unsigned long y) |
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{ |
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#if __BITS_PER_LONG == 64 |
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return __swab64(y); |
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#else /* __BITS_PER_LONG == 32 */ |
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return __swab32(y); |
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#endif |
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} |
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/** |
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* __swahw32 - return a word-swapped 32-bit value |
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* @x: value to wordswap |
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* |
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* __swahw32(0x12340000) is 0x00001234 |
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*/ |
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#define __swahw32(x) \ |
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(__builtin_constant_p((__u32)(x)) ? \ |
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___constant_swahw32(x) : \ |
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__fswahw32(x)) |
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/** |
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* __swahb32 - return a high and low byte-swapped 32-bit value |
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* @x: value to byteswap |
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* |
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* __swahb32(0x12345678) is 0x34127856 |
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*/ |
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#define __swahb32(x) \ |
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(__builtin_constant_p((__u32)(x)) ? \ |
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___constant_swahb32(x) : \ |
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__fswahb32(x)) |
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/** |
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* __swab16p - return a byteswapped 16-bit value from a pointer |
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* @p: pointer to a naturally-aligned 16-bit value |
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*/ |
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static __always_inline __u16 __swab16p(const __u16 *p) |
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{ |
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#ifdef __arch_swab16p |
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return __arch_swab16p(p); |
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#else |
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return __swab16(*p); |
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#endif |
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} |
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/** |
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* __swab32p - return a byteswapped 32-bit value from a pointer |
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* @p: pointer to a naturally-aligned 32-bit value |
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*/ |
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static __always_inline __u32 __swab32p(const __u32 *p) |
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{ |
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#ifdef __arch_swab32p |
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return __arch_swab32p(p); |
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#else |
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return __swab32(*p); |
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#endif |
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} |
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/** |
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* __swab64p - return a byteswapped 64-bit value from a pointer |
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* @p: pointer to a naturally-aligned 64-bit value |
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*/ |
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static __always_inline __u64 __swab64p(const __u64 *p) |
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{ |
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#ifdef __arch_swab64p |
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return __arch_swab64p(p); |
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#else |
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return __swab64(*p); |
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#endif |
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} |
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/** |
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* __swahw32p - return a wordswapped 32-bit value from a pointer |
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* @p: pointer to a naturally-aligned 32-bit value |
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* |
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* See __swahw32() for details of wordswapping. |
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*/ |
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static inline __u32 __swahw32p(const __u32 *p) |
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{ |
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#ifdef __arch_swahw32p |
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return __arch_swahw32p(p); |
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#else |
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return __swahw32(*p); |
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#endif |
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} |
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/** |
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* __swahb32p - return a high and low byteswapped 32-bit value from a pointer |
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* @p: pointer to a naturally-aligned 32-bit value |
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* |
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* See __swahb32() for details of high/low byteswapping. |
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*/ |
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static inline __u32 __swahb32p(const __u32 *p) |
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{ |
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#ifdef __arch_swahb32p |
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return __arch_swahb32p(p); |
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#else |
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return __swahb32(*p); |
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#endif |
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} |
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/** |
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* __swab16s - byteswap a 16-bit value in-place |
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* @p: pointer to a naturally-aligned 16-bit value |
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*/ |
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static inline void __swab16s(__u16 *p) |
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{ |
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#ifdef __arch_swab16s |
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__arch_swab16s(p); |
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#else |
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*p = __swab16p(p); |
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#endif |
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} |
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/** |
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* __swab32s - byteswap a 32-bit value in-place |
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* @p: pointer to a naturally-aligned 32-bit value |
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*/ |
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static __always_inline void __swab32s(__u32 *p) |
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{ |
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#ifdef __arch_swab32s |
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__arch_swab32s(p); |
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#else |
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*p = __swab32p(p); |
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#endif |
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} |
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/** |
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* __swab64s - byteswap a 64-bit value in-place |
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* @p: pointer to a naturally-aligned 64-bit value |
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*/ |
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static __always_inline void __swab64s(__u64 *p) |
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{ |
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#ifdef __arch_swab64s |
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__arch_swab64s(p); |
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#else |
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*p = __swab64p(p); |
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#endif |
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} |
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/** |
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* __swahw32s - wordswap a 32-bit value in-place |
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* @p: pointer to a naturally-aligned 32-bit value |
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* |
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* See __swahw32() for details of wordswapping |
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*/ |
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static inline void __swahw32s(__u32 *p) |
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{ |
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#ifdef __arch_swahw32s |
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__arch_swahw32s(p); |
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#else |
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*p = __swahw32p(p); |
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#endif |
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} |
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/** |
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* __swahb32s - high and low byteswap a 32-bit value in-place |
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* @p: pointer to a naturally-aligned 32-bit value |
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* |
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* See __swahb32() for details of high and low byte swapping |
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*/ |
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static inline void __swahb32s(__u32 *p) |
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{ |
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#ifdef __arch_swahb32s |
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__arch_swahb32s(p); |
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#else |
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*p = __swahb32p(p); |
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#endif |
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} |
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#endif /* _UAPI_LINUX_SWAB_H */
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