| /* |
| * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. |
| * |
| * Copyright (C) 2002-2018 Aleph One Ltd. |
| * |
| * Created by Charles Manning <charles@aleph1.co.uk> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * Endian processing functions. |
| */ |
| |
| #include "yaffs_endian.h" |
| #include "yaffs_guts.h" |
| |
| |
| void yaffs_do_endian_u32(struct yaffs_dev *dev, u32 *val) |
| { |
| if (!dev->swap_endian) |
| return; |
| *val = swap_u32(*val); |
| } |
| |
| void yaffs_do_endian_s32(struct yaffs_dev *dev, s32 *val) |
| { |
| if (!dev->swap_endian) |
| return; |
| *val = swap_s32(*val); |
| } |
| |
| void yaffs_do_endian_oh(struct yaffs_dev *dev, struct yaffs_obj_hdr *oh) |
| { |
| if (!dev->swap_endian) |
| return; |
| /* Change every field */ |
| oh->type = swap_u32(oh->type); |
| oh->parent_obj_id = swap_u32(oh->parent_obj_id); |
| |
| oh->yst_mode = swap_u32(oh->yst_mode); |
| |
| oh->yst_uid = swap_u32(oh->yst_uid); |
| oh->yst_gid = swap_u32(oh->yst_gid); |
| oh->yst_atime = swap_u32(oh->yst_atime); |
| oh->yst_mtime = swap_u32(oh->yst_mtime); |
| oh->yst_ctime = swap_u32(oh->yst_ctime); |
| |
| oh->file_size_low = swap_u32(oh->file_size_low); |
| |
| oh->equiv_id = swap_u32(oh->equiv_id); |
| |
| oh->yst_rdev = swap_u32(oh->yst_rdev); |
| |
| oh->win_ctime[0] = swap_u32(oh->win_ctime[0]); |
| oh->win_ctime[1] = swap_u32(oh->win_ctime[1]); |
| oh->win_atime[0] = swap_u32(oh->win_atime[0]); |
| oh->win_atime[1] = swap_u32(oh->win_atime[1]); |
| oh->win_mtime[0] = swap_u32(oh->win_mtime[0]); |
| oh->win_mtime[1] = swap_u32(oh->win_mtime[1]); |
| |
| oh->inband_shadowed_obj_id = swap_u32(oh->inband_shadowed_obj_id); |
| oh->inband_is_shrink = swap_u32(oh->inband_is_shrink); |
| |
| oh->file_size_high = swap_u32(oh->file_size_high); |
| oh->reserved[0] = swap_u32(oh->reserved[0]); |
| oh->shadows_obj = swap_s32(oh->shadows_obj); |
| |
| oh->is_shrink = swap_u32(oh->is_shrink); |
| } |
| |
| |
| void yaffs_do_endian_packed_tags2(struct yaffs_dev *dev, |
| struct yaffs_packed_tags2_tags_only *ptt) |
| { |
| if (!dev->swap_endian) |
| return; |
| ptt->seq_number = swap_u32(ptt->seq_number); |
| ptt->obj_id = swap_u32(ptt->obj_id); |
| ptt->chunk_id = swap_u32(ptt->chunk_id); |
| ptt->n_bytes = swap_u32(ptt->n_bytes); |
| } |
| |
| void yaffs_endian_config(struct yaffs_dev *dev) |
| { |
| u32 x = 1; |
| |
| if (dev->tnode_size < 1) |
| BUG(); |
| |
| dev->swap_endian = 0; |
| |
| if (((char *)&x)[0] == 1) { |
| /* Little Endian. */ |
| if (dev->param.stored_endian == 2 /* big endian */) |
| dev->swap_endian = 1; |
| } else { |
| /* Big Endian. */ |
| if (dev->param.stored_endian == 1 /* little endian */) |
| dev->swap_endian = 1; |
| } |
| |
| if (dev->swap_endian) |
| dev->tn_swap_buffer = kmalloc(dev->tnode_size, GFP_NOFS); |
| } |