arch/m68k/include/asm/byteorder.h

   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 */