1 files changed, 82 insertions, 0 deletions

diff --git a/include/asm-parisc/byteorder.h b/include/asm-parisc/byteorder.h
new file mode 100644
index 00000000000..db148313de5
--- /dev/null
+++ b/include/asm-parisc/byteorder.h
@@ -0,0 +1,82 @@
+#ifndef _PARISC_BYTEORDER_H
+#define _PARISC_BYTEORDER_H
+
+#include <asm/types.h>
+#include <linux/compiler.h>
+
+#ifdef __GNUC__
+
+static __inline__ __attribute_const__ __u16 ___arch__swab16(__u16 x)
+{
+        __asm__("dep %0, 15, 8, %0\n\t"         /* deposit 00ab -> 0bab */
+                "shd %%r0, %0, 8, %0"           /* shift 000000ab -> 00ba */
+                : "=r" (x)
+                : "0" (x));
+        return x;
+}
+
+static __inline__ __attribute_const__ __u32 ___arch__swab24(__u32 x)
+{
+        __asm__("shd %0, %0, 8, %0\n\t"         /* shift xabcxabc -> cxab */
+                "dep %0, 15, 8, %0\n\t"         /* deposit cxab -> cbab */
+                "shd %%r0, %0, 8, %0"           /* shift 0000cbab -> 0cba */
+                : "=r" (x)
+                : "0" (x));
+        return x;
+}
+
+static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
+{
+        unsigned int temp;
+        __asm__("shd %0, %0, 16, %1\n\t"        /* shift abcdabcd -> cdab */
+                "dep %1, 15, 8, %1\n\t"         /* deposit cdab -> cbab */
+                "shd %0, %1, 8, %0"             /* shift abcdcbab -> dcba */
+                : "=r" (x), "=&r" (temp)
+                : "0" (x));
+        return x;
+}
+
+
+#if BITS_PER_LONG > 32
+/*
+** From "PA-RISC 2.0 Architecture", HP Professional Books.
+** See Appendix I page 8 , "Endian Byte Swapping".
+**
+** Pretty cool algorithm: (* == zero'd bits)
+**      PERMH   01234567 -> 67452301 into %0
+**      HSHL    67452301 -> 7*5*3*1* into %1
+**      HSHR    67452301 -> *6*4*2*0 into %0
+**      OR      %0 | %1  -> 76543210 into %0 (all done!)
+*/
+static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x) {
+        __u64 temp;
+        __asm__("permh,3210 %0, %0\n\t"
+                "hshl %0, 8, %1\n\t"
+                "hshr,u %0, 8, %0\n\t"
+                "or %1, %0, %0"
+                : "=r" (x), "=&r" (temp)
+                : "0" (x));
+        return x;
+}
+#define __arch__swab64(x) ___arch__swab64(x)
+#define __BYTEORDER_HAS_U64__
+#elif !defined(__STRICT_ANSI__)
+static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x)
+{
+        __u32 t1 = ___arch__swab32((__u32) x);
+        __u32 t2 = ___arch__swab32((__u32) (x >> 32));
+        return (((__u64) t1 << 32) | t2);
+}
+#define __arch__swab64(x) ___arch__swab64(x)
+#define __BYTEORDER_HAS_U64__
+#endif
+
+#define __arch__swab16(x) ___arch__swab16(x)
+#define __arch__swab24(x) ___arch__swab24(x)
+#define __arch__swab32(x) ___arch__swab32(x)
+
+#endif /* __GNUC__ */
+
+#include <linux/byteorder/big_endian.h>
+
+#endif /* _PARISC_BYTEORDER_H */