1*819833afSPeter Tyser /* 2*819833afSPeter Tyser * include/asm-microblaze/byteorder.h -- Endian id and conversion ops 3*819833afSPeter Tyser * 4*819833afSPeter Tyser * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au> 5*819833afSPeter Tyser * Copyright (C) 2001 NEC Corporation 6*819833afSPeter Tyser * Copyright (C) 2001 Miles Bader <miles@gnu.org> 7*819833afSPeter Tyser * 8*819833afSPeter Tyser * This file is subject to the terms and conditions of the GNU General 9*819833afSPeter Tyser * Public License. See the file COPYING in the main directory of this 10*819833afSPeter Tyser * archive for more details. 11*819833afSPeter Tyser * 12*819833afSPeter Tyser * Written by Miles Bader <miles@gnu.org> 13*819833afSPeter Tyser * Microblaze port by John Williams 14*819833afSPeter Tyser */ 15*819833afSPeter Tyser 16*819833afSPeter Tyser #ifndef __MICROBLAZE_BYTEORDER_H__ 17*819833afSPeter Tyser #define __MICROBLAZE_BYTEORDER_H__ 18*819833afSPeter Tyser 19*819833afSPeter Tyser #include <asm/types.h> 20*819833afSPeter Tyser 21*819833afSPeter Tyser #ifdef __GNUC__ 22*819833afSPeter Tyser 23*819833afSPeter Tyser /* This is effectively a dupe of the arch-independent byteswap 24*819833afSPeter Tyser code in include/linux/byteorder/swab.h, however we force a cast 25*819833afSPeter Tyser of the result up to 32 bits. This in turn forces the compiler 26*819833afSPeter Tyser to explicitly clear the high 16 bits, which it wasn't doing otherwise. 27*819833afSPeter Tyser 28*819833afSPeter Tyser I think this is a symptom of a bug in mb-gcc. JW 20040303 29*819833afSPeter Tyser */ 30*819833afSPeter Tyser 31*819833afSPeter Tyser 32*819833afSPeter Tyser static __inline__ __u16 ___arch__swab16 (__u16 half_word) 33*819833afSPeter Tyser { 34*819833afSPeter Tyser /* 32 bit temp to cast result, forcing clearing of high word */ 35*819833afSPeter Tyser __u32 temp; 36*819833afSPeter Tyser 37*819833afSPeter Tyser temp = ((half_word & 0x00FFU) << 8) | ((half_word & 0xFF00U) >> 8); 38*819833afSPeter Tyser 39*819833afSPeter Tyser return (__u16) temp; 40*819833afSPeter Tyser } 41*819833afSPeter Tyser 42*819833afSPeter Tyser #define __arch__swab16(x) ___arch__swab16(x) 43*819833afSPeter Tyser 44*819833afSPeter Tyser /* Microblaze has no arch-specific endian conversion insns */ 45*819833afSPeter Tyser 46*819833afSPeter Tyser #if !defined(__STRICT_ANSI__) || defined(__KERNEL__) 47*819833afSPeter Tyser # define __BYTEORDER_HAS_U64__ 48*819833afSPeter Tyser # define __SWAB_64_THRU_32__ 49*819833afSPeter Tyser #endif 50*819833afSPeter Tyser 51*819833afSPeter Tyser #endif /* __GNUC__ */ 52*819833afSPeter Tyser 53*819833afSPeter Tyser #include <linux/byteorder/big_endian.h> 54*819833afSPeter Tyser 55*819833afSPeter Tyser #endif /* __MICROBLAZE_BYTEORDER_H__ */ 56