1 files changed, 73 insertions, 0 deletions
diff --git a/kernel/arch/cris/include/arch-v10/arch/bitops.h b/kernel/arch/cris/include/arch-v10/arch/bitops.h
new file mode 100644
index 000000000..03d9cfd92
--- /dev/null
+++ b/kernel/arch/cris/include/arch-v10/arch/bitops.h
@@ -0,0 +1,73 @@
+/* asm/arch/bitops.h for Linux/CRISv10 */
+
+#ifndef _CRIS_ARCH_BITOPS_H
+#define _CRIS_ARCH_BITOPS_H
+
+/*
+ * Helper functions for the core of the ff[sz] functions, wrapping the
+ * syntactically awkward asms.  The asms compute the number of leading
+ * zeroes of a bits-in-byte and byte-in-word and word-in-dword-swapped
+ * number.  They differ in that the first function also inverts all bits
+ * in the input.
+ */
+static inline unsigned long cris_swapnwbrlz(unsigned long w)
+{
+	/* Let's just say we return the result in the same register as the
+	   input.  Saying we clobber the input but can return the result
+	   in another register:
+	   !  __asm__ ("swapnwbr %2\n\tlz %2,%0"
+	   !	      : "=r,r" (res), "=r,X" (dummy) : "1,0" (w));
+	   confuses gcc (core.c, gcc from cris-dist-1.14).  */
+
+	unsigned long res;
+	__asm__ ("swapnwbr %0 \n\t"
+		 "lz %0,%0"
+		 : "=r" (res) : "0" (w));
+	return res;
+}
+
+static inline unsigned long cris_swapwbrlz(unsigned long w)
+{
+	unsigned res;
+	__asm__ ("swapwbr %0 \n\t"
+		 "lz %0,%0"
+		 : "=r" (res)
+		 : "0" (w));
+	return res;
+}
+
+/*
+ * ffz = Find First Zero in word. Undefined if no zero exists,
+ * so code should check against ~0UL first..
+ */
+static inline unsigned long ffz(unsigned long w)
+{
+	return cris_swapnwbrlz(w);
+}
+
+/**
+ * __ffs - find first bit in word.
+ * @word: The word to search
+ *
+ * Undefined if no bit exists, so code should check against 0 first.
+ */
+static inline unsigned long __ffs(unsigned long word)
+{
+	return cris_swapnwbrlz(~word);
+}
+
+/**
+ * ffs - find first bit set
+ * @x: the word to search
+ *
+ * This is defined the same way as
+ * the libc and compiler builtin ffs routines, therefore
+ * differs in spirit from the above ffz (man ffs).
+ */
+
+static inline unsigned long kernel_ffs(unsigned long w)
+{
+	return w ? cris_swapwbrlz (w) + 1 : 0;
+}
+
+#endif