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diff --git a/libmaple/include/libmaple/util.h b/libmaple/include/libmaple/util.h
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ *
+ * 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.
+ *****************************************************************************/
+
+/**
+ * @file util.h
+ * @brief Miscellaneous utility macros and procedures.
+ */
+
+#ifndef _LIBMAPLE_UTIL_H_
+#define _LIBMAPLE_UTIL_H_
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+#include <libmaple/libmaple_types.h>
+
+/*
+ * Bit manipulation
+ */
+
+/** 1 << the bit number */
+#define BIT(shift)                     (1UL << (shift))
+/** Mask shifted left by 'shift' */
+#define BIT_MASK_SHIFT(mask, shift)    ((mask) << (shift))
+/** Bits m to n of x */
+#define GET_BITS(x, m, n) ((((uint32)x) << (31 - (n))) >> ((31 - (n)) + (m)))
+/** True if v is a power of two (1, 2, 4, 8, ...) */
+#define IS_POWER_OF_TWO(v)  ((v) && !((v) & ((v) - 1)))
+
+/*
+ * Failure routines
+ */
+
+void __error(void);
+void _fail(const char*, int, const char*);
+void throb(void);
+
+/*
+ * Asserts and debug levels
+ */
+
+#define DEBUG_NONE      0
+#define DEBUG_FAULT     1
+#define DEBUG_ALL       2
+
+/**
+ * \def DEBUG_LEVEL
+ *
+ * Controls the level of assertion checking.
+ *
+ * The higher the debug level, the more assertions will be compiled
+ * in.  This increases the amount of debugging information, but slows
+ * down (and increases the size of) the binary.
+ *
+ * The debug levels, from lowest to highest, are DEBUG_NONE,
+ * DEBUG_FAULT, and DEBUG_ALL.  The default level is DEBUG_ALL.
+ */
+
+#ifndef DEBUG_LEVEL
+#define DEBUG_LEVEL DEBUG_ALL
+#endif
+
+#if DEBUG_LEVEL >= DEBUG_ALL
+#define ASSERT(exp)                              \
+    if (exp) {                                   \
+    } else {                                     \
+        _fail(__FILE__, __LINE__, #exp);         \
+    }
+#else
+#define ASSERT(exp) (void)((0))
+#endif
+
+#if DEBUG_LEVEL >= DEBUG_FAULT
+#define ASSERT_FAULT(exp)                       \
+    if (exp) {                                  \
+    } else {                                    \
+        _fail(__FILE__, __LINE__, #exp);        \
+    }
+#else
+#define ASSERT_FAULT(exp) (void)((0))
+#endif
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif