diff --git a/src/bsp/lk/include/bits.h b/src/bsp/lk/include/bits.h
new file mode 100644
index 0000000..7b9b8aa
--- /dev/null
+++ b/src/bsp/lk/include/bits.h
@@ -0,0 +1,93 @@
+/*
+ * 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
+
+#include <compiler.h>
+#include <arch/ops.h>
+
+__BEGIN_CDECLS;
+
+#define clz(x) __builtin_clz(x)
+#define ctz(x) __builtin_ctz(x)
+
+#define BIT(x, bit) ((x) & (1UL << (bit)))
+#define BIT_SHIFT(x, bit) (((x) >> (bit)) & 1)
+#define BITS(x, high, low) ((x) & (((1UL<<((high)+1))-1) & ~((1UL<<(low))-1)))
+#define BITS_SHIFT(x, high, low) (((x) >> (low)) & ((1UL<<((high)-(low)+1))-1))
+#define BIT_SET(x, bit) (((x) & (1UL << (bit))) ? 1 : 0)
+
+#define BITMAP_BITS_PER_WORD (sizeof(unsigned long) * 8)
+#define BITMAP_NUM_WORDS(x) (((x) + BITMAP_BITS_PER_WORD - 1) / BITMAP_BITS_PER_WORD)
+#define BITMAP_WORD(x) ((x) / BITMAP_BITS_PER_WORD)
+#define BITMAP_BIT_IN_WORD(x) ((x) & (BITMAP_BITS_PER_WORD - 1))
+
+#define BITMAP_BITS_PER_INT (sizeof(unsigned int) * 8)
+#define BITMAP_BIT_IN_INT(x) ((x) & (BITMAP_BITS_PER_INT - 1))
+#define BITMAP_INT(x) ((x) / BITMAP_BITS_PER_INT)
+
+#define BIT_MASK(x) (((x) >= sizeof(unsigned long) * 8) ? (0UL-1) : ((1UL << (x)) - 1))
+
+static inline int bitmap_set(unsigned long *bitmap, int bit)
+{
+	unsigned long mask = 1UL << BITMAP_BIT_IN_INT(bit);
+	return atomic_or(&((int*)bitmap)[BITMAP_INT(bit)], mask) & mask ? 1 : 0;
+}
+
+static inline int bitmap_clear(unsigned long *bitmap, int bit)
+{
+	unsigned long mask = 1UL << BITMAP_BIT_IN_INT(bit);
+
+	return atomic_and(&((int*)bitmap)[BITMAP_INT(bit)], ~mask) & mask ? 1:0;
+}
+
+static inline int bitmap_test(unsigned long *bitmap, int bit)
+{
+	return BIT_SET(bitmap[BITMAP_WORD(bit)], BITMAP_BIT_IN_WORD(bit));
+}
+
+/* find first zero bit starting from LSB */
+static inline unsigned long _ffz(unsigned long x)
+{
+	return __builtin_ffsl(~x) - 1;
+}
+
+static inline int bitmap_ffz(unsigned long *bitmap, int numbits)
+{
+	uint i;
+	int bit;
+
+	for (i = 0; i < BITMAP_NUM_WORDS(numbits); i++) {
+		if (bitmap[i] == ~0UL)
+			continue;
+		bit = i * BITMAP_BITS_PER_WORD + _ffz(bitmap[i]);
+		if (bit < numbits)
+			return bit;
+		return -1;
+	}
+	return -1;
+}
+
+__END_CDECLS;
+
+#endif