| 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 General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | * Endian processing functions. |
| 13 | */ |
| 14 | |
| 15 | #include "yaffs_endian.h" |
| 16 | #include "yaffs_guts.h" |
| 17 | |
| 18 | |
| 19 | void yaffs_do_endian_u32(struct yaffs_dev *dev, u32 *val) |
| 20 | { |
| 21 | if (!dev->swap_endian) |
| 22 | return; |
| 23 | *val = swap_u32(*val); |
| 24 | } |
| 25 | |
| 26 | void yaffs_do_endian_s32(struct yaffs_dev *dev, s32 *val) |
| 27 | { |
| 28 | if (!dev->swap_endian) |
| 29 | return; |
| 30 | *val = swap_s32(*val); |
| 31 | } |
| 32 | |
| 33 | void yaffs_do_endian_oh(struct yaffs_dev *dev, struct yaffs_obj_hdr *oh) |
| 34 | { |
| 35 | if (!dev->swap_endian) |
| 36 | return; |
| 37 | /* Change every field */ |
| 38 | oh->type = swap_u32(oh->type); |
| 39 | oh->parent_obj_id = swap_u32(oh->parent_obj_id); |
| 40 | |
| 41 | oh->yst_mode = swap_u32(oh->yst_mode); |
| 42 | |
| 43 | oh->yst_uid = swap_u32(oh->yst_uid); |
| 44 | oh->yst_gid = swap_u32(oh->yst_gid); |
| 45 | oh->yst_atime = swap_u32(oh->yst_atime); |
| 46 | oh->yst_mtime = swap_u32(oh->yst_mtime); |
| 47 | oh->yst_ctime = swap_u32(oh->yst_ctime); |
| 48 | |
| 49 | oh->file_size_low = swap_u32(oh->file_size_low); |
| 50 | |
| 51 | oh->equiv_id = swap_u32(oh->equiv_id); |
| 52 | |
| 53 | oh->yst_rdev = swap_u32(oh->yst_rdev); |
| 54 | |
| 55 | oh->win_ctime[0] = swap_u32(oh->win_ctime[0]); |
| 56 | oh->win_ctime[1] = swap_u32(oh->win_ctime[1]); |
| 57 | oh->win_atime[0] = swap_u32(oh->win_atime[0]); |
| 58 | oh->win_atime[1] = swap_u32(oh->win_atime[1]); |
| 59 | oh->win_mtime[0] = swap_u32(oh->win_mtime[0]); |
| 60 | oh->win_mtime[1] = swap_u32(oh->win_mtime[1]); |
| 61 | |
| 62 | oh->inband_shadowed_obj_id = swap_u32(oh->inband_shadowed_obj_id); |
| 63 | oh->inband_is_shrink = swap_u32(oh->inband_is_shrink); |
| 64 | |
| 65 | oh->file_size_high = swap_u32(oh->file_size_high); |
| 66 | oh->reserved[0] = swap_u32(oh->reserved[0]); |
| 67 | oh->shadows_obj = swap_s32(oh->shadows_obj); |
| 68 | |
| 69 | oh->is_shrink = swap_u32(oh->is_shrink); |
| 70 | } |
| 71 | |
| 72 | |
| 73 | void yaffs_do_endian_packed_tags2(struct yaffs_dev *dev, |
| 74 | struct yaffs_packed_tags2_tags_only *ptt) |
| 75 | { |
| 76 | if (!dev->swap_endian) |
| 77 | return; |
| 78 | ptt->seq_number = swap_u32(ptt->seq_number); |
| 79 | ptt->obj_id = swap_u32(ptt->obj_id); |
| 80 | ptt->chunk_id = swap_u32(ptt->chunk_id); |
| 81 | ptt->n_bytes = swap_u32(ptt->n_bytes); |
| 82 | } |
| 83 | |
| 84 | void yaffs_endian_config(struct yaffs_dev *dev) |
| 85 | { |
| 86 | u32 x = 1; |
| 87 | |
| 88 | if (dev->tnode_size < 1) |
| 89 | BUG(); |
| 90 | |
| 91 | dev->swap_endian = 0; |
| 92 | |
| 93 | if (((char *)&x)[0] == 1) { |
| 94 | /* Little Endian. */ |
| 95 | if (dev->param.stored_endian == 2 /* big endian */) |
| 96 | dev->swap_endian = 1; |
| 97 | } else { |
| 98 | /* Big Endian. */ |
| 99 | if (dev->param.stored_endian == 1 /* little endian */) |
| 100 | dev->swap_endian = 1; |
| 101 | } |
| 102 | |
| 103 | if (dev->swap_endian) |
| 104 | dev->tn_swap_buffer = kmalloc(dev->tnode_size, GFP_NOFS); |
| 105 | } |