yaffs2: Yaffs endian support

[yaffs2.git] / yaffs_endian.h

diff --git a/yaffs_endian.h b/yaffs_endian.h
new file mode 100644 (file)
index 0000000..d37bc50
--- /dev/null
+++ b/yaffs_endian.h
@@ -0,0 +1,52 @@
+/*
+ * 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 Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_ENDIAN_H__
+#define __YAFFS_ENDIAN_H__
+#include "yaffs_guts.h"
+#include "yaffs_packedtags2.h"
+
+static inline u32 swap_u32(u32 val)
+{
+       return ((val >>24) & 0x000000ff) |
+              ((val >> 8) & 0x0000ff00) |
+              ((val << 8) & 0x00ff0000) |
+              ((val <<24) & 0xff000000);
+}
+
+#define swap_s32(val) \
+       (s32)(swap_u32((u32)(val)))
+
+static inline Y_LOFF_T swap_loff_t(Y_LOFF_T lval)
+{
+       u32 vall = swap_u32((u32) (lval & 0xffffffff));
+       u32 valh;
+
+       if (sizeof(Y_LOFF_T) == sizeof(u32))
+               return (Y_LOFF_T) vall;
+
+       valh = swap_u32((u32) ((lval >> 32) & 0xffffffff));
+
+       return (Y_LOFF_T)((((u64)vall) << 32) | valh);
+}
+
+void yaffs_do_endian_s32(struct yaffs_dev *dev, s32 *val);
+void yaffs_do_endian_u32(struct yaffs_dev *dev, u32 *val);
+void yaffs_do_endian_oh(struct yaffs_dev *dev, struct yaffs_obj_hdr *oh);
+void yaffs_do_endian_packed_tags2(struct yaffs_dev *dev,
+                               struct yaffs_packed_tags2_tags_only *ptt);
+void yaffs_endian_config(struct yaffs_dev *dev);
+
+#endif