1 files changed, 20 insertions, 0 deletions
diff --git a/src/arch/x86/include/bitops.h b/src/arch/x86/include/bitops.h
new file mode 100644
index 0000000000..9206465c77
--- /dev/null
+++ b/src/arch/x86/include/bitops.h
@@ -0,0 +1,20 @@
+#ifndef I386_BITOPS_H
+#define I386_BITOPS_H
+
+/**
+ * log2 - Find the truncated log base 2 of x
+ */
+
+static inline unsigned long log2(unsigned long x)
+{
+	unsigned long r = 0;
+	__asm__(
+		"bsrl %1, %0\n\t"
+		"jnz 1f\n\t"
+		"movl $-1, %0\n\t"
+		"1:\n\t"
+		: "=r" (r) : "r" (x));
+	return r;
+
+}
+#endif /* I386_BITOPS_H */