yaffs2: Yaffs endian support

[yaffs2.git] / yaffs_endian.c

diff --git a/yaffs_endian.c b/yaffs_endian.c
new file mode 100644 (file)
index 0000000..0bc67fe
--- /dev/null
+++ b/yaffs_endian.c
@@ -0,0 +1,106 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * 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_s32(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);
+}