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authorJosh Boyer <jwboyer@gmail.com>2006-05-16 05:39:27 -0500
committerJosh Boyer <jwboyer@gmail.com>2006-05-16 05:39:27 -0500
commit7349dc6de42b696619d7632fb6a016f848d63bca (patch)
treed98e517e7e1c5ec3906d642c4bedf7c3fdebd364 /include/mtd_swab.h
parentba3d8f61a6ce84437bc8e92d30b541336fb6b47b (diff)
Consolidate the swab macros into one location
Signed-off-by: Josh Boyer <jwboyer@gmail.com>
Diffstat (limited to 'include/mtd_swab.h')
-rw-r--r--include/mtd_swab.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/include/mtd_swab.h b/include/mtd_swab.h
new file mode 100644
index 0000000..05732a9
--- /dev/null
+++ b/include/mtd_swab.h
@@ -0,0 +1,33 @@
+#ifndef MTD_SWAB_H
+#define MTD_SWAB_H
+
+#include <endian.h>
+
+#define swab16(x) \
+ ((__u16)( \
+ (((__u16)(x) & (__u16)0x00ffU) << 8) | \
+ (((__u16)(x) & (__u16)0xff00U) >> 8) ))
+#define swab32(x) \
+ ((__u32)( \
+ (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \
+ (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \
+ (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \
+ (((__u32)(x) & (__u32)0xff000000UL) >> 24) ))
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+#define cpu_to_le16(x) ({ __u16 _x = x; swab16(_x); })
+#define cpu_to_le32(x) ({ __u32 _x = x; swab32(_x); })
+#define cpu_to_be16(x) (x)
+#define cpu_to_be32(x) (x)
+#else
+#define cpu_to_le16(x) (x)
+#define cpu_to_le32(x) (x)
+#define cpu_to_be16(x) ({ __u16 _x = x; swab16(_x); })
+#define cpu_to_be32(x) ({ __u32 _x = x; swab32(_x); })
+#endif
+#define le16_to_cpu(x) cpu_to_le16(x)
+#define be16_to_cpu(x) cpu_to_be16(x)
+#define le32_to_cpu(x) cpu_to_le32(x)
+#define be32_to_cpu(x) cpu_to_be32(x)
+
+#endif