From: Rob Herring <rob.herr...@calxeda.com>
swab functions are heavily used by FDT code, so enable
optimized assembly code for ARMv6 and later.
Signed-off-by: Rob Herring <rob.herr...@calxeda.com>
---
arch/arm/include/asm/byteorder.h | 16 ++++++++++++++++
1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/byteorder.h b/arch/arm/include/asm/byteorder.h
index c3489f1..9df5844 100644
--- a/arch/arm/include/asm/byteorder.h
+++ b/arch/arm/include/asm/byteorder.h
@@ -23,6 +23,22 @@
# define __SWAB_64_THRU_32__
#endif
+#if defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_6__)
+static inline __u16 __attribute__((const)) ___arch_swab16(__u16 x)
+{
+ __asm__ ("rev16 %0, %1" : "=r" (x) : "r" (x));
+ return x;
+}
+#define __arch_swab16 ___arch_swab16
+
+static inline __u32 __attribute__((const)) ___arch_swab32(__u32 x)
+{
+ __asm__ ("rev %0, %1" : "=r" (x) : "r" (x));
+ return x;
+}
+#define __arch_swab32 ___arch_swab32
+#endif
+
#ifdef __ARMEB__
#include <linux/byteorder/big_endian.h>
#else
--
1.7.1
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