1 files changed, 35 insertions, 0 deletions

diff --git a/arch/avr32/include/asm/swab.h b/arch/avr32/include/asm/swab.h
new file mode 100644
index 000000000000..a14aa5b46d98
--- /dev/null
+++ b/arch/avr32/include/asm/swab.h
@@ -0,0 +1,35 @@
+/*
+ * AVR32 byteswapping functions.
+ */
+#ifndef __ASM_AVR32_SWAB_H
+#define __ASM_AVR32_SWAB_H
+
+#include <asm/types.h>
+#include <linux/compiler.h>
+
+#define __SWAB_64_THRU_32__
+
+#ifdef __CHECKER__
+extern unsigned long __builtin_bswap_32(unsigned long x);
+extern unsigned short __builtin_bswap_16(unsigned short x);
+#endif
+
+/*
+ * avr32-linux-gcc versions earlier than 4.2 improperly sign-extends
+ * the result.
+ */
+#if !(__GNUC__ == 4 && __GNUC_MINOR__ < 2)
+static inline __attribute_const__ __u16 __arch_swab16(__u16 val)
+{
+        return __builtin_bswap_16(val);
+}
+#define __arch_swab16 __arch_swab16
+
+static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
+{
+        return __builtin_bswap_32(val);
+}
+#define __arch_swab32 __arch_swab32
+#endif
+
+#endif /* __ASM_AVR32_SWAB_H */