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