diff --git a/common.h b/common.h
index dc92934..ee537a8 100644
--- a/common.h
+++ b/common.h
@@ -4,16 +4,19 @@
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- *    http://www.apache.org/licenses/LICENSE-2.0
+ * http://www.apache.org/licenses/LICENSE-2.0
  *
- *	Unless required by applicable law or agreed to in writing, software
- *	distributed under the License is distributed on an "AS IS" BASIS,
- *	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *	See the License for the specific language governing permissions and
- *	limitations under the License.
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  *
  */
 
+#ifndef COMMON_H
+#define COMMON_H
+
 #ifndef PREFIX
 #define PREFIX ""
 #endif
@@ -24,6 +27,13 @@
    MBOX_LOG_DEBUG = 2
 } verbosity;
 
+#define MSG_OUT(f_, ...)	do { if (verbosity >= MBOX_LOG_DEBUG) { \
+					mbox_log(LOG_INFO, f_, ##__VA_ARGS__); \
+				} } while (0)
+#define MSG_ERR(f_, ...)	do { if (verbosity >= MBOX_LOG_VERBOSE) { \
+					mbox_log(LOG_ERR, f_, ##__VA_ARGS__); \
+				} } while (0)
+
 void (*mbox_vlog)(int p, const char *fmt, va_list args);
 
 void mbox_log_console(int p, const char *fmt, va_list args);
@@ -39,4 +49,40 @@
 
 void put_u32(uint8_t *ptr, uint32_t val);
 
+static inline uint32_t align_up(uint32_t val, uint32_t size)
+{
+	return (((val) + (size) - 1) & ~((size) - 1));
+}
+
+static inline uint32_t align_down(uint32_t val, uint32_t size)
+{
+	return ((val) & ~(((size) - 1)));
+}
+
+static inline uint32_t min_u32(uint32_t a, uint32_t b)
+{
+	if (a <= b) {
+		return a;
+	}
+
+	return b;
+}
+
+static inline int log_2(int val)
+{
+	int ret = 0;
+
+	if (val <= 0) {
+		return -1;
+	}
+
+	while (val >>= 1) {
+		ret++;
+	}
+
+	return ret;
+}
+
 char *get_dev_mtd(void);
+
+#endif /* COMMON_H */