Root/fs/jfs/endian24.h

1/*
2 * Copyright (C) International Business Machines Corp., 2001
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18#ifndef _H_ENDIAN24
19#define _H_ENDIAN24
20
21/*
22 * endian24.h:
23 *
24 * Endian conversion for 24-byte data
25 *
26 */
27#define __swab24(x) \
28({ \
29    __u32 __x = (x); \
30    ((__u32)( \
31        ((__x & (__u32)0x000000ffUL) << 16) | \
32         (__x & (__u32)0x0000ff00UL) | \
33        ((__x & (__u32)0x00ff0000UL) >> 16) )); \
34})
35
36#if (defined(__KERNEL__) && defined(__LITTLE_ENDIAN)) || (defined(__BYTE_ORDER) && (__BYTE_ORDER == __LITTLE_ENDIAN))
37    #define __cpu_to_le24(x) ((__u32)(x))
38    #define __le24_to_cpu(x) ((__u32)(x))
39#else
40    #define __cpu_to_le24(x) __swab24(x)
41    #define __le24_to_cpu(x) __swab24(x)
42#endif
43
44#ifdef __KERNEL__
45    #define cpu_to_le24 __cpu_to_le24
46    #define le24_to_cpu __le24_to_cpu
47#endif
48
49#endif /* !_H_ENDIAN24 */
50

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