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@@ -0,0 +1,93 @@
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+/* File: libc/sysdeps/linux/bfin/bits/byteswap.h
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+ *
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+ * Copyright 2004-2006 Analog Devices Inc.
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+ *
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+ * Enter bugs at http://blackfin.uclinux.org/
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+ *
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+ * Licensed under the GPL-2 or later.
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+ */
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+
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+#if !defined _BYTESWAP_H && !defined _NETINET_IN_H
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+# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
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+#endif
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+
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+#ifndef _BITS_BYTESWAP_H
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+#define _BITS_BYTESWAP_H 1
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+
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+/* Swap bytes in 16 bit value. */
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+#define __bswap_constant_16(x) \
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+ ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
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+
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+#ifdef __GNUC__
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+# define __bswap_16(x) \
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+ (__extension__ \
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+ ({ register unsigned short int __v, __x = (x); \
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+ if (__builtin_constant_p (__x)) \
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+ __v = __bswap_constant_16 (__x); \
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+ else \
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+ __asm__ ("%0 <<= 8;" \
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+ "%1.L = %0.L + %0.H (NS);" \
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+ : "+d" (__x), "=d" (__v)); \
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+ __v; }))
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+#else
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+static __inline unsigned short int
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+__bswap_16 (unsigned short int __bsx)
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+{
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+ return __bswap_constant_16 (__bsx);
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+}
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+#endif
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+
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+/* Swap bytes in 32 bit value. */
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+#define __bswap_constant_32(x) \
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+ ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \
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+ (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24))
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+
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+#ifdef __GNUC__
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+# define __bswap_32(x) \
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+ (__extension__ \
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+ ({ register unsigned int __v, __x = (x); \
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+ if (__builtin_constant_p (__x)) \
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+ __v = __bswap_constant_32 (__x); \
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+ else \
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+ __asm__ ("%1 = %0 >> 8 (V);" \
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+ "%0 = %0 << 8 (V);" \
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+ "%0 = %0 | %1;" \
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+ "%1 = PACK(%0.L, %0.H);" \
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+ : "+d"(__x), "=&d"(__v)); \
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+ __v; }))
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+#else
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+static __inline unsigned int
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+__bswap_32 (unsigned int __bsx)
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+{
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+ return __bswap_constant_32 (__bsx);
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+}
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+#endif
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+
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+#if defined __GNUC__ && __GNUC__ >= 2
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+/* Swap bytes in 64 bit value. */
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+# define __bswap_constant_64(x) \
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+ ((((x) & 0xff00000000000000ull) >> 56) \
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+ | (((x) & 0x00ff000000000000ull) >> 40) \
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+ | (((x) & 0x0000ff0000000000ull) >> 24) \
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+ | (((x) & 0x000000ff00000000ull) >> 8) \
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+ | (((x) & 0x00000000ff000000ull) << 8) \
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+ | (((x) & 0x0000000000ff0000ull) << 24) \
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+ | (((x) & 0x000000000000ff00ull) << 40) \
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+ | (((x) & 0x00000000000000ffull) << 56))
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+
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+# define __bswap_64(x) \
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+ (__extension__ \
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+ ({ union { __extension__ unsigned long long int __ll; \
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+ unsigned int __l[2]; } __w, __r; \
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+ if (__builtin_constant_p (x)) \
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+ __r.__ll = __bswap_constant_64 (x); \
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+ else \
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+ { \
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+ __w.__ll = (x); \
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+ __r.__l[0] = __bswap_32 (__w.__l[1]); \
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+ __r.__l[1] = __bswap_32 (__w.__l[0]); \
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+ } \
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+ __r.__ll; }))
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+#endif
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+
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+#endif /* _BITS_BYTESWAP_H */
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