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Diffstat (limited to 'arch/microblaze/include/asm/byteorder.h')
| -rw-r--r-- | arch/microblaze/include/asm/byteorder.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/microblaze/include/asm/byteorder.h b/arch/microblaze/include/asm/byteorder.h new file mode 100644 index 00000000000..a4a75b7a6dc --- /dev/null +++ b/arch/microblaze/include/asm/byteorder.h @@ -0,0 +1,55 @@ +/* + * 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__ */ |