blackfin: introduce asm/swab.h

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/arch/blackfin/include/asm/swab.h b/arch/blackfin/include/asm/swab.h
new file mode 100644
index 000000000000..69a051b612bd
--- /dev/null
+++ b/arch/blackfin/include/asm/swab.h
@@ -0,0 +1,48 @@
+#ifndef _BLACKFIN_SWAB_H
+#define _BLACKFIN_SWAB_H
+
+#include <asm/types.h>
+#include <linux/compiler.h>
+
+#if defined(__GNUC__) && !defined(__STRICT_ANSI__) || defined(__KERNEL__)
+#  define __SWAB_64_THRU_32__
+#endif
+
+#ifdef __GNUC__
+
+static __inline__ __attribute_const__ __u32 __arch_swahb32(__u32 xx)
+{
+        __u32 tmp;
+        __asm__("%1 = %0 >> 8 (V);\n\t"
+                "%0 = %0 << 8 (V);\n\t"
+                "%0 = %0 | %1;\n\t"
+                : "+d"(xx), "=&d"(tmp));
+        return xx;
+}
+#define __arch_swahb32 __arch_swahb32
+
+static __inline__ __attribute_const__ __u32 __arch_swahw32(__u32 xx)
+{
+        __u32 rv;
+        __asm__("%0 = PACK(%1.L, %1.H);\n\t": "=d"(rv): "d"(xx));
+        return rv;
+}
+#define __arch_swahw32 __arch_swahw32
+
+static __inline__ __attribute_const__ __u32 __arch_swab32(__u32 xx)
+{
+        return __arch_swahb32(__arch_swahw32(xx));
+}
+#define __arch_swab32 __arch_swab32
+
+static __inline__ __attribute_const__ __u16 __arch_swab16(__u16 xx)
+{
+        __u32 xw = xx;
+        __asm__("%0 <<= 8;\n    %0.L = %0.L + %0.H (NS);\n": "+d"(xw));
+        return (__u16)xw;
+}
+#define __arch_swab16 __arch_swab16
+
+#endif /* __GNUC__ */
+
+#endif                          /* _BLACKFIN_SWAB_H */