Copy amd64 endian.h to x86 and merge with i386 endian.h. Replace

amd64/i386/pc98 endian.h with stubs.

In __bswap64_const(x) the conflict between 0xffUL and 0xffULL has been
resolved by reimplementing the macro in terms of __bswap32(x). As a side
effect __bswap64_var(x) is now implemented using two bswap instructions on
i386 and should be much faster. __bswap32_const(x) has been reimplemented
in terms of __bswap16(x) for consistency.

1 files changed, 138 insertions, 0 deletions

diff --git a/sys/x86/include/endian.h b/sys/x86/include/endian.h
new file mode 100644
index 0000000..7a850c7
--- /dev/null
+++ b/sys/x86/include/endian.h
@@ -0,0 +1,138 @@
+/*-
+ * Copyright (c) 1987, 1991 Regents of the University of California.
+ * 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.
+ * 4. 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	7.8 (Berkeley) 4/3/91
+ * $FreeBSD$
+ */
+
+#ifndef _MACHINE_ENDIAN_H_
+#define	_MACHINE_ENDIAN_H_
+
+#include <sys/cdefs.h>
+#include <sys/_types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Define the order of 32-bit words in 64-bit words.
+ */
+#define	_QUAD_HIGHWORD 1
+#define	_QUAD_LOWWORD 0
+
+/*
+ * 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
+
+/*
+ * Deprecated variants that don't have enough underscores to be useful in more
+ * strict namespaces.
+ */
+#if __BSD_VISIBLE
+#define	LITTLE_ENDIAN	_LITTLE_ENDIAN
+#define	BIG_ENDIAN	_BIG_ENDIAN
+#define	PDP_ENDIAN	_PDP_ENDIAN
+#define	BYTE_ORDER	_BYTE_ORDER
+#endif
+
+#if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE_BUILTIN_CONSTANT_P)
+
+#define	__bswap16_const(_x)	(__uint16_t)((_x) << 8 | (_x) >> 8)
+
+#define	__bswap16(_x)			\
+	(__builtin_constant_p(_x) ?	\
+	    __bswap16_const((__uint16_t)(_x)) : __bswap16_var(_x))
+
+#define	__bswap32_const(_x)		\
+	(((__uint32_t)__bswap16(_x) << 16) | __bswap16((_x) >> 16))
+
+#define	__bswap32(_x)			\
+	(__builtin_constant_p(_x) ?	\
+	    __bswap32_const((__uint32_t)(_x)) : __bswap32_var(_x))
+
+#define	__bswap64_const(_x)		\
+	(((__uint64_t)__bswap32(_x) << 32) | __bswap32((_x) >> 32))
+
+#define	__bswap64(_x)			\
+	(__builtin_constant_p(_x) ?	\
+	    __bswap64_const((__uint64_t)(_x)) : __bswap64_var(_x))
+
+static __inline __uint16_t
+__bswap16_var(__uint16_t _x)
+{
+
+	return (__bswap16_const(_x));
+}
+
+static __inline __uint32_t
+__bswap32_var(__uint32_t _x)
+{
+
+	__asm ("bswap %0" : "+r" (_x));
+	return (_x);
+}
+
+static __inline __uint64_t
+__bswap64_var(__uint64_t _x)
+{
+#ifdef	_LP64
+	__asm ("bswap %0" : "+r" (_x));
+	return (_x);
+#else
+	return (__bswap64_const(_x));
+#endif
+}
+
+#define	__htonl(x)	__bswap32(x)
+#define	__htons(x)	__bswap16(x)
+#define	__ntohl(x)	__bswap32(x)
+#define	__ntohs(x)	__bswap16(x)
+
+#else /* !(__GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P) */
+
+/*
+ * No optimizations are available for this compiler.  Fall back to
+ * non-optimized functions by defining the constant usually used to prevent
+ * redefinition.
+ */
+#define	_BYTEORDER_FUNC_DEFINED
+
+#endif /* __GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !_MACHINE_ENDIAN_H_ */