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-rw-r--r--include/asm-arm/byteorder.h15
1 files changed, 14 insertions, 1 deletions
diff --git a/include/asm-arm/byteorder.h b/include/asm-arm/byteorder.h
index d648a1915c33..af42f449b9a6 100644
--- a/include/asm-arm/byteorder.h
+++ b/include/asm-arm/byteorder.h
@@ -15,9 +15,22 @@
#ifndef __ASM_ARM_BYTEORDER_H
#define __ASM_ARM_BYTEORDER_H
-
#include <asm/types.h>
+static inline __attribute_const__ __u32 ___arch__swab32(__u32 x)
+{
+ __u32 t;
+
+ t = x ^ ((x << 16) | (x >> 16)); /* eor r1,r0,r0,ror #16 */
+ x = (x << 24) | (x >> 8); /* mov r0,r0,ror #8 */
+ t &= ~0x00FF0000; /* bic r1,r1,#0x00FF0000 */
+ x ^= (t >> 8); /* eor r0,r0,r1,lsr #8 */
+
+ return x;
+}
+
+#define __arch__swab32(x) ___arch__swab32(x)
+
#if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
# define __BYTEORDER_HAS_U64__
# define __SWAB_64_THRU_32__