diff options
Diffstat (limited to 'include/asm-m68k/byteorder.h')
| -rw-r--r-- | include/asm-m68k/byteorder.h | 102 |
1 files changed, 101 insertions, 1 deletions
diff --git a/include/asm-m68k/byteorder.h b/include/asm-m68k/byteorder.h index ce613ac..0e2a0ed 100644 --- a/include/asm-m68k/byteorder.h +++ b/include/asm-m68k/byteorder.h @@ -1,7 +1,107 @@ +/* + * Copyright (C) 2004-2007 Freescale Semiconductor, Inc. + * TsiChung Liew (Tsi-Chung.Liew@freescale.com) + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + #ifndef _M68K_BYTEORDER_H #define _M68K_BYTEORDER_H #include <asm/types.h> + +#ifdef __GNUC__ +#define __sw16(x) \ + ((__u16)( \ + (((__u16)(x) & (__u16)0x00ffU) << 8) | \ + (((__u16)(x) & (__u16)0xff00U) >> 8) )) +#define __sw32(x) \ + ((__u32)( \ + (((__u32)(x)) << 24) | \ + (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ + (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ + (((__u32)(x)) >> 24) )) + +extern __inline__ unsigned ld_le16(const volatile unsigned short *addr) +{ + unsigned result = *addr; + return __sw16(result); +} + +extern __inline__ void st_le16(volatile unsigned short *addr, + const unsigned val) +{ + *addr = __sw16(val); +} + +extern __inline__ unsigned ld_le32(const volatile unsigned *addr) +{ + unsigned result = *addr; + return __sw32(result); +} + +extern __inline__ void st_le32(volatile unsigned *addr, const unsigned val) +{ + *addr = __sw32(val); +} + +#if 0 +/* alas, egcs sounds like it has a bug in this code that doesn't use the + inline asm correctly, and can cause file corruption. Until I hear that + it's fixed, I can live without the extra speed. I hope. */ +#if !(__GNUC__ >= 2 && __GNUC_MINOR__ >= 90) +#if 0 +# define __arch_swab16(x) ld_le16(&x) +# define __arch_swab32(x) ld_le32(&x) +#else +static __inline__ __attribute__ ((const)) +__u16 ___arch__swab16(__u16 value) +{ + return __sw16(value); +} + +static __inline__ __attribute__ ((const)) +__u32 ___arch__swab32(__u32 value) +{ + return __sw32(value); +} + +#define __arch__swab32(x) ___arch__swab32(x) +#define __arch__swab16(x) ___arch__swab16(x) +#endif /* 0 */ + +#endif + +/* The same, but returns converted value from the location pointer by addr. */ +#define __arch__swab16p(addr) ld_le16(addr) +#define __arch__swab32p(addr) ld_le32(addr) + +/* The same, but do the conversion in situ, ie. put the value back to addr. */ +#define __arch__swab16s(addr) st_le16(addr,*addr) +#define __arch__swab32s(addr) st_le32(addr,*addr) +#endif + +#endif /* __GNUC__ */ + +#if defined(__GNUC__) && !defined(__STRICT_ANSI__) +#define __BYTEORDER_HAS_U64__ +#endif #include <linux/byteorder/big_endian.h> -#endif /* _M68K_BYTEORDER_H */ +#endif /* _M68K_BYTEORDER_H */ |