stdlib: import endian head file from freebsd

Import endian head files from FreeBSD 11.0. The link of FreeBSD source code
is https://github.com/freebsd/freebsd

Import machine/endian.h from sys/arm64/include/endian.h in FreeBSD.
commit d09ff72cef8e35dbf62f7363dcbf07b453f06243
Author: andrew <andrew@FreeBSD.org>
Date:   Mon Mar 23 11:54:56 2015 +0000

    Add the start of the arm64 machine headers. This is the subset needed to
    start getting userland libraries building.

    Reviewed by:        imp
    Sponsored by:       The FreeBSD Foundation

Import sys/endian.h from sys/sys/endian.h in FreeBSD.
commit 3c3fa2f5b0c7640373fcbcc3f667bf7794e8e609
Author: phk <phk@FreeBSD.org>
Date:   Thu May 20 06:16:13 2010 +0000

    Fix some way-past-brucification complaints from FlexeLint.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>

2 files changed, 327 insertions, 0 deletions

diff --git a/include/lib/stdlib/machine/endian.h b/include/lib/stdlib/machine/endian.h
new file mode 100644
index 00000000..a6a0cb76
--- /dev/null
+++ b/include/lib/stdlib/machine/endian.h
@@ -0,0 +1,122 @@
+/*-
+ * Copyright (c) 2001 David E. O'Brien
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)endian.h	8.1 (Berkeley) 6/10/93
+ * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $
+ * $FreeBSD$
+ */
+
+#ifndef _MACHINE_ENDIAN_H_
+#define	_MACHINE_ENDIAN_H_
+
+#include <sys/_types.h>
+
+/*
+ * Definitions for byte order, according to byte significance from low
+ * address to high.
+ */
+#define	_LITTLE_ENDIAN  1234    /* LSB first: i386, vax */
+#define	_BIG_ENDIAN     4321    /* MSB first: 68000, ibm, net */
+#define	_PDP_ENDIAN     3412    /* LSB first in word, MSW first in long */
+
+#define	_BYTE_ORDER	_LITTLE_ENDIAN
+
+#if __BSD_VISIBLE
+#define	LITTLE_ENDIAN   _LITTLE_ENDIAN
+#define	BIG_ENDIAN      _BIG_ENDIAN
+#define	PDP_ENDIAN      _PDP_ENDIAN
+#define	BYTE_ORDER      _BYTE_ORDER
+#endif
+
+#define	_QUAD_HIGHWORD  1
+#define	_QUAD_LOWWORD 0
+#define	__ntohl(x)        (__bswap32(x))
+#define	__ntohs(x)        (__bswap16(x))
+#define	__htonl(x)        (__bswap32(x))
+#define	__htons(x)        (__bswap16(x))
+
+static __inline __uint64_t
+__bswap64(__uint64_t x)
+{
+	__uint64_t ret;
+
+	__asm __volatile("rev %0, %1\n"
+			 : "=&r" (ret), "+r" (x));
+	
+	return (ret);
+}
+
+static __inline __uint32_t
+__bswap32_var(__uint32_t v)
+{
+	__uint32_t ret;
+
+	__asm __volatile("rev32 %x0, %x1\n"
+			 : "=&r" (ret), "+r" (v));
+	
+	return (ret);
+}
+
+static __inline __uint16_t
+__bswap16_var(__uint16_t v)
+{
+	__uint32_t ret;
+
+	__asm __volatile("rev16 %w0, %w1\n"
+			 : "=&r" (ret), "+r" (v));
+
+	return ((__uint16_t)ret);
+}		
+
+#ifdef __OPTIMIZE__
+
+#define	__bswap32_constant(x)	\
+    ((((x) & 0xff000000U) >> 24) |	\
+     (((x) & 0x00ff0000U) >>  8) |	\
+     (((x) & 0x0000ff00U) <<  8) |	\
+     (((x) & 0x000000ffU) << 24))
+
+#define	__bswap16_constant(x)	\
+    ((((x) & 0xff00) >> 8) |		\
+     (((x) & 0x00ff) << 8))
+
+#define	__bswap16(x)	\
+    ((__uint16_t)(__builtin_constant_p(x) ?	\
+     __bswap16_constant(x) :			\
+     __bswap16_var(x)))
+
+#define	__bswap32(x)	\
+    ((__uint32_t)(__builtin_constant_p(x) ? 	\
+     __bswap32_constant(x) :			\
+     __bswap32_var(x)))
+
+#else
+#define	__bswap16(x)	__bswap16_var(x)
+#define	__bswap32(x)	__bswap32_var(x)
+
+#endif /* __OPTIMIZE__ */
+#endif /* !_MACHINE_ENDIAN_H_ */
diff --git a/include/lib/stdlib/sys/endian.h b/include/lib/stdlib/sys/endian.h
new file mode 100644
index 00000000..d50110ca
--- /dev/null
+++ b/include/lib/stdlib/sys/endian.h
@@ -0,0 +1,205 @@
+/*-
+ * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _SYS_ENDIAN_H_
+#define _SYS_ENDIAN_H_
+
+#include <sys/cdefs.h>
+#include <sys/_types.h>
+#include <machine/endian.h>
+
+#ifndef _UINT8_T_DECLARED
+typedef	__uint8_t	uint8_t;
+#define	_UINT8_T_DECLARED
+#endif
+ 
+#ifndef _UINT16_T_DECLARED
+typedef	__uint16_t	uint16_t;
+#define	_UINT16_T_DECLARED
+#endif
+ 
+#ifndef _UINT32_T_DECLARED
+typedef	__uint32_t	uint32_t;
+#define	_UINT32_T_DECLARED
+#endif
+ 
+#ifndef _UINT64_T_DECLARED
+typedef	__uint64_t	uint64_t;
+#define	_UINT64_T_DECLARED
+#endif
+ 
+/*
+ * General byte order swapping functions.
+ */
+#define	bswap16(x)	__bswap16(x)
+#define	bswap32(x)	__bswap32(x)
+#define	bswap64(x)	__bswap64(x)
+
+/*
+ * Host to big endian, host to little endian, big endian to host, and little
+ * endian to host byte order functions as detailed in byteorder(9).
+ */
+#if _BYTE_ORDER == _LITTLE_ENDIAN
+#define	htobe16(x)	bswap16((x))
+#define	htobe32(x)	bswap32((x))
+#define	htobe64(x)	bswap64((x))
+#define	htole16(x)	((uint16_t)(x))
+#define	htole32(x)	((uint32_t)(x))
+#define	htole64(x)	((uint64_t)(x))
+
+#define	be16toh(x)	bswap16((x))
+#define	be32toh(x)	bswap32((x))
+#define	be64toh(x)	bswap64((x))
+#define	le16toh(x)	((uint16_t)(x))
+#define	le32toh(x)	((uint32_t)(x))
+#define	le64toh(x)	((uint64_t)(x))
+#else /* _BYTE_ORDER != _LITTLE_ENDIAN */
+#define	htobe16(x)	((uint16_t)(x))
+#define	htobe32(x)	((uint32_t)(x))
+#define	htobe64(x)	((uint64_t)(x))
+#define	htole16(x)	bswap16((x))
+#define	htole32(x)	bswap32((x))
+#define	htole64(x)	bswap64((x))
+
+#define	be16toh(x)	((uint16_t)(x))
+#define	be32toh(x)	((uint32_t)(x))
+#define	be64toh(x)	((uint64_t)(x))
+#define	le16toh(x)	bswap16((x))
+#define	le32toh(x)	bswap32((x))
+#define	le64toh(x)	bswap64((x))
+#endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
+
+/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
+
+static __inline uint16_t
+be16dec(const void *pp)
+{
+	uint8_t const *p = (uint8_t const *)pp;
+
+	return ((p[0] << 8) | p[1]);
+}
+
+static __inline uint32_t
+be32dec(const void *pp)
+{
+	uint8_t const *p = (uint8_t const *)pp;
+
+	return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
+}
+
+static __inline uint64_t
+be64dec(const void *pp)
+{
+	uint8_t const *p = (uint8_t const *)pp;
+
+	return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
+}
+
+static __inline uint16_t
+le16dec(const void *pp)
+{
+	uint8_t const *p = (uint8_t const *)pp;
+
+	return ((p[1] << 8) | p[0]);
+}
+
+static __inline uint32_t
+le32dec(const void *pp)
+{
+	uint8_t const *p = (uint8_t const *)pp;
+
+	return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
+}
+
+static __inline uint64_t
+le64dec(const void *pp)
+{
+	uint8_t const *p = (uint8_t const *)pp;
+
+	return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
+}
+
+static __inline void
+be16enc(void *pp, uint16_t u)
+{
+	uint8_t *p = (uint8_t *)pp;
+
+	p[0] = (u >> 8) & 0xff;
+	p[1] = u & 0xff;
+}
+
+static __inline void
+be32enc(void *pp, uint32_t u)
+{
+	uint8_t *p = (uint8_t *)pp;
+
+	p[0] = (u >> 24) & 0xff;
+	p[1] = (u >> 16) & 0xff;
+	p[2] = (u >> 8) & 0xff;
+	p[3] = u & 0xff;
+}
+
+static __inline void
+be64enc(void *pp, uint64_t u)
+{
+	uint8_t *p = (uint8_t *)pp;
+
+	be32enc(p, (uint32_t)(u >> 32));
+	be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
+}
+
+static __inline void
+le16enc(void *pp, uint16_t u)
+{
+	uint8_t *p = (uint8_t *)pp;
+
+	p[0] = u & 0xff;
+	p[1] = (u >> 8) & 0xff;
+}
+
+static __inline void
+le32enc(void *pp, uint32_t u)
+{
+	uint8_t *p = (uint8_t *)pp;
+
+	p[0] = u & 0xff;
+	p[1] = (u >> 8) & 0xff;
+	p[2] = (u >> 16) & 0xff;
+	p[3] = (u >> 24) & 0xff;
+}
+
+static __inline void
+le64enc(void *pp, uint64_t u)
+{
+	uint8_t *p = (uint8_t *)pp;
+
+	le32enc(p, (uint32_t)(u & 0xffffffffU));
+	le32enc(p + 4, (uint32_t)(u >> 32));
+}
+
+#endif	/* _SYS_ENDIAN_H_ */