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Matthew Fioravante
7ab9bbf9f8
This patch addes byte swapping macros and endian support to mini-os. Signed-off-by: Matthew Fioravante <matthew.fioravante@jhuapl.edu> Acked-by: Samuel Thibault <samuel.thibault@ens-lyons.org> Committed-by: Ian Campbell <ian.campbell@citrix.com>
40 lines
1.5 KiB
C
40 lines
1.5 KiB
C
#ifndef _BYTESWAP_H_
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#define _BYTESWAP_H_
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/* Unfortunately not provided by newlib. */
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#include <mini-os/types.h>
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#define bswap_16(x) ((uint16_t)( \
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(((uint16_t)(x) & (uint16_t)0x00ffU) << 8) | \
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(((uint16_t)(x) & (uint16_t)0xff00U) >> 8)))
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/* Use gcc optimized versions if they exist */
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#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
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#define bswap_32(v) __builtin_bswap32(v)
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#define bswap_64(v) __builtin_bswap64(v)
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#else
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#define bswap_32(x) ((uint32_t)( \
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(((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \
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(((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \
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(((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \
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(((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))
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#define bswap_64(x) ((uint64_t)( \
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(((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \
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(((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
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(((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
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(((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \
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(((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \
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(((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
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(((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
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(((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56)))
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#endif
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#endif /* _BYTESWAP_H */
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