2 * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
4 * Copyright (C) 2002-2018 Aleph One Ltd.
6 * Created by Charles Manning <charles@aleph1.co.uk>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU Lesser General Public License version 2.1 as
10 * published by the Free Software Foundation.
12 * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
15 #ifndef __YAFFS_ENDIAN_H__
16 #define __YAFFS_ENDIAN_H__
17 #include "yaffs_guts.h"
18 #include "yaffs_packedtags2.h"
20 static inline u32 swap_u32(u32 val)
22 return ((val >>24) & 0x000000ff) |
23 ((val >> 8) & 0x0000ff00) |
24 ((val << 8) & 0x00ff0000) |
25 ((val <<24) & 0xff000000);
28 static inline u64 swap_u64(u64 val)
30 return ((val >> 56) & 0x00000000000000ff) |
31 ((val >> 40) & 0x000000000000ff00) |
32 ((val >> 24) & 0x0000000000ff0000) |
33 ((val >> 8) & 0x00000000ff000000) |
34 ((val << 8) & 0x000000ff00000000) |
35 ((val << 24) & 0x0000ff0000000000) |
36 ((val << 40) & 0x00ff000000000000) |
37 ((val << 56) & 0xff00000000000000);
40 //YTIME_T can be a 32 or 64 bit number.
41 #if YAFFS_USE_32_BIT_TIME_T
42 #define swap_ytime_t( val ) swap_u32(val)
44 #define swap_ytime_t( val ) swap_u64(val)
47 //swap a signed 32 bit integer.
48 #define swap_s32(val) \
49 (s32)(swap_u32((u32)(val)))
51 static inline loff_t swap_loff_t(loff_t lval)
53 u32 vall = swap_u32(FSIZE_LOW(lval));
56 if (sizeof(loff_t) == sizeof(u32))
59 valh = swap_u32(FSIZE_HIGH(lval));
61 return FSIZE_COMBINE(vall, valh); /*NB: h and l are swapped. */
67 void yaffs_do_endian_s32(struct yaffs_dev *dev, s32 *val);
68 void yaffs_do_endian_u32(struct yaffs_dev *dev, u32 *val);
69 void yaffs_do_endian_oh(struct yaffs_dev *dev, struct yaffs_obj_hdr *oh);
70 void yaffs_do_endian_packed_tags2(struct yaffs_dev *dev,
71 struct yaffs_packed_tags2_tags_only *ptt);
72 void yaffs_endian_config(struct yaffs_dev *dev);