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/*
* include/asm-microblaze/byteorder.h -- Endian id and conversion ops
*
* Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au>
* Copyright (C) 2001 NEC Corporation
* Copyright (C) 2001 Miles Bader <miles@gnu.org>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*
* Written by Miles Bader <miles@gnu.org>
* Microblaze port by John Williams
*/
#ifndef __MICROBLAZE_BYTEORDER_H__
#define __MICROBLAZE_BYTEORDER_H__
#include <asm/types.h>
#ifdef __GNUC__
/* This is effectively a dupe of the arch-independent byteswap
code in include/linux/byteorder/swab.h, however we force a cast
of the result up to 32 bits. This in turn forces the compiler
to explicitly clear the high 16 bits, which it wasn't doing otherwise.
I think this is a symptom of a bug in mb-gcc. JW 20040303
*/
static __inline__ __u16 ___arch__swab16 (__u16 half_word)
{
/* 32 bit temp to cast result, forcing clearing of high word */
__u32 temp;
temp = ((half_word & 0x00FFU) << 8) | ((half_word & 0xFF00U) >> 8);
return (__u16) temp;
}
#define __arch__swab16(x) ___arch__swab16(x)
/* Microblaze has no arch-specific endian conversion insns */
#if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
# define __BYTEORDER_HAS_U64__
# define __SWAB_64_THRU_32__
#endif
#endif /* __GNUC__ */
#include <linux/byteorder/big_endian.h>
#endif /* __MICROBLAZE_BYTEORDER_H__ */
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