60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/*
|
|
* 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__ */
|
|
|
|
#ifdef __MICROBLAZEEL__
|
|
#include <linux/byteorder/little_endian.h>
|
|
#else
|
|
#include <linux/byteorder/big_endian.h>
|
|
#endif
|
|
|
|
#endif /* __MICROBLAZE_BYTEORDER_H__ */
|