[src/sommerfeld_i386mp_1]: src/sys/arch/i386/include minor knf

[lukem <lukem%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/5557ee92f6a9
branches:  sommerfeld_i386mp_1
changeset: 482451:5557ee92f6a9
user:      lukem <lukem%NetBSD.org@localhost>
date:      Thu Nov 29 02:46:56 2001 +0000

description:
minor knf

diffstat:

 sys/arch/i386/include/byte_swap.h |  96 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 96 insertions(+), 0 deletions(-)

diffs (100 lines):

diff -r 4f6d40748841 -r 5557ee92f6a9 sys/arch/i386/include/byte_swap.h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/i386/include/byte_swap.h Thu Nov 29 02:46:56 2001 +0000
@@ -0,0 +1,96 @@
+/*     $NetBSD: byte_swap.h,v 1.6.2.2 2001/11/29 02:46:56 lukem Exp $  */
+
+/*-
+ * Copyright (c) 1998 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Charles M. Hannum.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *        This product includes software developed by the NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#ifndef _I386_BYTE_SWAP_H_
+#define        _I386_BYTE_SWAP_H_
+
+#include <sys/types.h>
+
+#if defined(_KERNEL_OPT)
+#include "opt_cputype.h"
+#endif
+
+
+static __inline u_int32_t __byte_swap_long_variable(u_int32_t);
+static __inline u_int16_t __byte_swap_word_variable(u_int16_t);
+
+static __inline u_int32_t
+__byte_swap_long_variable(u_int32_t x)
+{
+       __asm __volatile (
+#if defined(_KERNEL) && !defined(_LKM) && !defined(I386_CPU)
+           "bswap %1"
+#else
+           "rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1"
+#endif
+           : "=r" (x) : "0" (x));
+       return (x);
+}
+
+static __inline u_int16_t
+__byte_swap_word_variable(u_int16_t x)
+{
+       __asm __volatile ("rorw $8, %w1" : "=r" (x) : "0" (x)); 
+       return (x);
+}
+
+#ifdef __OPTIMIZE__
+
+#define        __byte_swap_long_constant(x) \
+       ((((x) & 0xff000000) >> 24) | \
+        (((x) & 0x00ff0000) >>  8) | \
+        (((x) & 0x0000ff00) <<  8) | \
+        (((x) & 0x000000ff) << 24))
+#define        __byte_swap_word_constant(x) \
+       ((((x) & 0xff00) >> 8) | \
+        (((x) & 0x00ff) << 8))
+#define        __byte_swap_long(x) \
+       (__builtin_constant_p((x)) ? \
+        __byte_swap_long_constant(x) : __byte_swap_long_variable(x))
+#define        __byte_swap_word(x) \
+       (__builtin_constant_p((x)) ? \
+        __byte_swap_word_constant(x) : __byte_swap_word_variable(x))
+
+#else /* __OPTIMIZE__ */
+
+#define        __byte_swap_long(x)     __byte_swap_long_variable(x)
+#define        __byte_swap_word(x)     __byte_swap_word_variable(x)
+
+#endif /* __OPTIMIZE__ */
+
+#endif /* !_I386_BYTE_SWAP_H_ */