| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | /* |
| 2 | * YAFFS: Yet another Flash File System . A NAND-flash specific file system. |
| 3 | * |
| 4 | * Copyright (C) 2002-2018 Aleph One Ltd. |
| 5 | * |
| 6 | * Created by Charles Manning <charles@aleph1.co.uk> |
| 7 | * |
| 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. |
| 11 | * |
| 12 | * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. |
| 13 | */ |
| 14 | |
| 15 | #ifndef __YAFFS_ENDIAN_H__ |
| 16 | #define __YAFFS_ENDIAN_H__ |
| 17 | #include "yaffs_guts.h" |
| 18 | #include "yaffs_packedtags2.h" |
| 19 | |
| 20 | static inline u32 swap_u32(u32 val) |
| 21 | { |
| 22 | return ((val >>24) & 0x000000ff) | |
| 23 | ((val >> 8) & 0x0000ff00) | |
| 24 | ((val << 8) & 0x00ff0000) | |
| 25 | ((val <<24) & 0xff000000); |
| 26 | } |
| 27 | |
| 28 | #define swap_s32(val) \ |
| 29 | (s32)(swap_u32((u32)(val))) |
| 30 | |
| 31 | static inline loff_t swap_loff_t(loff_t lval) |
| 32 | { |
| 33 | u32 vall = swap_u32(FSIZE_LOW(lval)); |
| 34 | u32 valh; |
| 35 | |
| 36 | if (sizeof(loff_t) == sizeof(u32)) |
| 37 | return (loff_t) vall; |
| 38 | |
| 39 | valh = swap_u32(FSIZE_HIGH(lval)); |
| 40 | |
| 41 | return FSIZE_COMBINE(vall, valh); /*NB: h and l are swapped. */ |
| 42 | } |
| 43 | |
| 44 | |
| 45 | |
| 46 | struct yaffs_dev; |
| 47 | void yaffs_do_endian_s32(struct yaffs_dev *dev, s32 *val); |
| 48 | void yaffs_do_endian_u32(struct yaffs_dev *dev, u32 *val); |
| 49 | void yaffs_do_endian_oh(struct yaffs_dev *dev, struct yaffs_obj_hdr *oh); |
| 50 | void yaffs_do_endian_packed_tags2(struct yaffs_dev *dev, |
| 51 | struct yaffs_packed_tags2_tags_only *ptt); |
| 52 | void yaffs_endian_config(struct yaffs_dev *dev); |
| 53 | |
| 54 | #endif |