initial commit of lk (little kernel) project
diff --git a/include/bits.h b/include/bits.h
new file mode 100644
index 0000000..8643253
--- /dev/null
+++ b/include/bits.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2008 Travis Geiselbrecht
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef __BITS_H
+#define __BITS_H
+
+#define clz(x) __builtin_clz(x)
+
+#define BIT(x, bit) ((x) & (1 << (bit)))
+#define BIT_SHIFT(x, bit) (((x) >> (bit)) & 1)
+#define BITS(x, high, low) ((x) & (((1<<((high)+1))-1) & ~((1<<(low))-1)))
+#define BITS_SHIFT(x, high, low) (((x) >> (low)) & ((1<<((high)-(low)+1))-1))
+#define BIT_SET(x, bit) (((x) & (1 << (bit))) ? 1 : 0)
+
+#endif