| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| /* |
| * linux/byteorder/swab.h |
| * Byte-swapping, independently from CPU endianness |
| * swabXX[ps]?(foo) |
| * |
| * Francois-Rene Rideau <fare@tunes.org> 19971205 |
| * separated swab functions from cpu_to_XX, |
| * to clean up support for bizarre-endian architectures. |
| * |
| * See asm-i386/byteorder.h and such for examples of how to provide |
| * architecture-dependent optimized versions |
| * |
| */ |
| |
| /* 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. |
| */ |
| |
| #ifndef _SWAB_H |
| #define _SWAB_H |
| |
| #include <stdint.h> |
| |
| #if ENV_ARMV4 |
| #define swab16(x) \ |
| ((unsigned short)( \ |
| (((unsigned short)(x) & (unsigned short)0x00ffU) << 8) | \ |
| (((unsigned short)(x) & (unsigned short)0xff00U) >> 8))) |
| |
| #define swab32(x) \ |
| ((unsigned int)( \ |
| (((unsigned int)(x) & 0x000000ffUL) << 24) | \ |
| (((unsigned int)(x) & 0x0000ff00UL) << 8) | \ |
| (((unsigned int)(x) & 0x00ff0000UL) >> 8) | \ |
| (((unsigned int)(x) & 0xff000000UL) >> 24))) |
| |
| #define 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))) |
| #else /* ENV_ARMV4 */ |
| #define swab16(x) ((uint16_t)__builtin_bswap16(x)) |
| #define swab32(x) ((uint32_t)__builtin_bswap32(x)) |
| #define swab64(x) ((uint64_t)__builtin_bswap64(x)) |
| #endif /* !ENV_ARMV4 */ |
| |
| #endif /* _SWAB_H */ |