1 /* 2 * Copyright (C) 2004-2007 Freescale Semiconductor, Inc. 3 * TsiChung Liew (Tsi-Chung.Liew@freescale.com) 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24 #ifndef _M68K_BYTEORDER_H 25 #define _M68K_BYTEORDER_H 26 27 #include <asm/types.h> 28 29 #ifdef __GNUC__ 30 #define __sw16(x) \ 31 ((__u16)( \ 32 (((__u16)(x) & (__u16)0x00ffU) << 8) | \ 33 (((__u16)(x) & (__u16)0xff00U) >> 8) )) 34 #define __sw32(x) \ 35 ((__u32)( \ 36 (((__u32)(x)) << 24) | \ 37 (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ 38 (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ 39 (((__u32)(x)) >> 24) )) 40 41 extern __inline__ unsigned ld_le16(const volatile unsigned short *addr) 42 { 43 unsigned result = *addr; 44 return __sw16(result); 45 } 46 47 extern __inline__ void st_le16(volatile unsigned short *addr, 48 const unsigned val) 49 { 50 *addr = __sw16(val); 51 } 52 53 extern __inline__ unsigned ld_le32(const volatile unsigned *addr) 54 { 55 unsigned result = *addr; 56 return __sw32(result); 57 } 58 59 extern __inline__ void st_le32(volatile unsigned *addr, const unsigned val) 60 { 61 *addr = __sw32(val); 62 } 63 64 #if 0 65 /* alas, egcs sounds like it has a bug in this code that doesn't use the 66 inline asm correctly, and can cause file corruption. Until I hear that 67 it's fixed, I can live without the extra speed. I hope. */ 68 #if !(__GNUC__ >= 2 && __GNUC_MINOR__ >= 90) 69 #if 0 70 # define __arch_swab16(x) ld_le16(&x) 71 # define __arch_swab32(x) ld_le32(&x) 72 #else 73 static __inline__ __attribute__ ((const)) 74 __u16 ___arch__swab16(__u16 value) 75 { 76 return __sw16(value); 77 } 78 79 static __inline__ __attribute__ ((const)) 80 __u32 ___arch__swab32(__u32 value) 81 { 82 return __sw32(value); 83 } 84 85 #define __arch__swab32(x) ___arch__swab32(x) 86 #define __arch__swab16(x) ___arch__swab16(x) 87 #endif /* 0 */ 88 89 #endif 90 91 /* The same, but returns converted value from the location pointer by addr. */ 92 #define __arch__swab16p(addr) ld_le16(addr) 93 #define __arch__swab32p(addr) ld_le32(addr) 94 95 /* The same, but do the conversion in situ, ie. put the value back to addr. */ 96 #define __arch__swab16s(addr) st_le16(addr,*addr) 97 #define __arch__swab32s(addr) st_le32(addr,*addr) 98 #endif 99 100 #endif /* __GNUC__ */ 101 102 #if defined(__GNUC__) && !defined(__STRICT_ANSI__) 103 #define __BYTEORDER_HAS_U64__ 104 #endif 105 #include <linux/byteorder/big_endian.h> 106 107 #endif /* _M68K_BYTEORDER_H */ 108