Index: uspace/lib/math/Makefile
===================================================================
--- uspace/lib/math/Makefile	(revision 1433ecda9b732f3f185f902feb26826ec2496e03)
+++ uspace/lib/math/Makefile	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
@@ -55,4 +55,5 @@
 	generic/log.c \
 	generic/log10.c \
+	generic/log2.c \
 	generic/modf.c \
 	generic/pow.c \
Index: uspace/lib/math/arch/abs32le/include/libarch/math.h
===================================================================
--- uspace/lib/math/arch/abs32le/include/libarch/math.h	(revision 1433ecda9b732f3f185f902feb26826ec2496e03)
+++ uspace/lib/math/arch/abs32le/include/libarch/math.h	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
@@ -51,4 +51,5 @@
 #include <log.h>
 #include <log10.h>
+#include <log2.h>
 #include <mathtypes.h>
 #include <modf.h>
@@ -212,4 +213,14 @@
 }
 
+static inline float32_t log2_f32(float32_t val)
+{
+	return float32_log2(val);
+}
+
+static inline float64_t log2_f64(float64_t val)
+{
+	return float64_log2(val);
+}
+
 static inline float64_t modf_f64(float64_t value, float64_t *iptr)
 {
@@ -440,4 +451,14 @@
 {
 	return log10_f32(val);
+}
+
+static inline float64_t log2(float64_t val)
+{
+	return log2_f64(val);
+}
+
+static inline float32_t log2f(float32_t val)
+{
+	return log2_f32(val);
 }
 
Index: uspace/lib/math/arch/amd64/include/libarch/math.h
===================================================================
--- uspace/lib/math/arch/amd64/include/libarch/math.h	(revision 1433ecda9b732f3f185f902feb26826ec2496e03)
+++ uspace/lib/math/arch/amd64/include/libarch/math.h	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
@@ -51,4 +51,5 @@
 #include <log.h>
 #include <log10.h>
+#include <log2.h>
 #include <mathtypes.h>
 #include <modf.h>
@@ -209,4 +210,14 @@
 }
 
+static inline float32_t log2_f32(float32_t val)
+{
+	return float32_log2(val);
+}
+
+static inline float64_t log2_f64(float64_t val)
+{
+	return float64_log2(val);
+}
+
 static inline float64_t modf_f64(float64_t value, float64_t *iptr)
 {
@@ -431,4 +442,14 @@
 {
 	return log10_f32(val);
+}
+
+static inline float64_t log2(float64_t val)
+{
+	return log2_f64(val);
+}
+
+static inline float32_t log2f(float32_t val)
+{
+	return log2_f32(val);
 }
 
Index: uspace/lib/math/arch/arm32/include/libarch/math.h
===================================================================
--- uspace/lib/math/arch/arm32/include/libarch/math.h	(revision 1433ecda9b732f3f185f902feb26826ec2496e03)
+++ uspace/lib/math/arch/arm32/include/libarch/math.h	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
@@ -51,4 +51,5 @@
 #include <log.h>
 #include <log10.h>
+#include <log2.h>
 #include <mathtypes.h>
 #include <modf.h>
@@ -212,4 +213,14 @@
 }
 
+static inline float32_t log2_f32(float32_t val)
+{
+	return float32_log2(val);
+}
+
+static inline float64_t log2_f64(float64_t val)
+{
+	return float64_log2(val);
+}
+
 static inline float64_t modf_f64(float64_t value, float64_t *iptr)
 {
@@ -440,4 +451,14 @@
 {
 	return log10_f32(val);
+}
+
+static inline float64_t log2(float64_t val)
+{
+	return log2_f64(val);
+}
+
+static inline float32_t log2f(float32_t val)
+{
+	return log2_f32(val);
 }
 
Index: uspace/lib/math/arch/ia32/include/libarch/math.h
===================================================================
--- uspace/lib/math/arch/ia32/include/libarch/math.h	(revision 1433ecda9b732f3f185f902feb26826ec2496e03)
+++ uspace/lib/math/arch/ia32/include/libarch/math.h	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
@@ -51,4 +51,5 @@
 #include <log.h>
 #include <log10.h>
+#include <log2.h>
 #include <mathtypes.h>
 #include <modf.h>
@@ -209,4 +210,14 @@
 }
 
+static inline float32_t log2_f32(float32_t val)
+{
+	return float32_log2(val);
+}
+
+static inline float64_t log2_f64(float64_t val)
+{
+	return float64_log2(val);
+}
+
 static inline float64_t modf_f64(float64_t value, float64_t *iptr)
 {
@@ -431,4 +442,14 @@
 {
 	return log10_f32(val);
+}
+
+static inline float64_t log2(float64_t val)
+{
+	return log2_f64(val);
+}
+
+static inline float32_t log2f(float32_t val)
+{
+	return log2_f32(val);
 }
 
Index: uspace/lib/math/arch/ia64/include/libarch/math.h
===================================================================
--- uspace/lib/math/arch/ia64/include/libarch/math.h	(revision 1433ecda9b732f3f185f902feb26826ec2496e03)
+++ uspace/lib/math/arch/ia64/include/libarch/math.h	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
@@ -51,4 +51,5 @@
 #include <log.h>
 #include <log10.h>
+#include <log2.h>
 #include <mathtypes.h>
 #include <modf.h>
@@ -212,4 +213,14 @@
 }
 
+static inline float32_t log2_f32(float32_t val)
+{
+	return float32_log2(val);
+}
+
+static inline float64_t log2_f64(float64_t val)
+{
+	return float64_log2(val);
+}
+
 static inline float64_t modf_f64(float64_t value, float64_t *iptr)
 {
@@ -440,4 +451,14 @@
 {
 	return log10_f32(val);
+}
+
+static inline float64_t log2(float64_t val)
+{
+	return log2_f64(val);
+}
+
+static inline float32_t log2f(float32_t val)
+{
+	return log2_f32(val);
 }
 
Index: uspace/lib/math/arch/mips32/include/libarch/math.h
===================================================================
--- uspace/lib/math/arch/mips32/include/libarch/math.h	(revision 1433ecda9b732f3f185f902feb26826ec2496e03)
+++ uspace/lib/math/arch/mips32/include/libarch/math.h	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
@@ -51,4 +51,5 @@
 #include <log.h>
 #include <log10.h>
+#include <log2.h>
 #include <mathtypes.h>
 #include <modf.h>
@@ -212,4 +213,14 @@
 }
 
+static inline float32_t log2_f32(float32_t val)
+{
+	return float32_log2(val);
+}
+
+static inline float64_t log2_f64(float64_t val)
+{
+	return float64_log2(val);
+}
+
 static inline float64_t modf_f64(float64_t value, float64_t *iptr)
 {
@@ -440,4 +451,14 @@
 {
 	return log10_f32(val);
+}
+
+static inline float64_t log2(float64_t val)
+{
+	return log2_f64(val);
+}
+
+static inline float32_t log2f(float32_t val)
+{
+	return log2_f32(val);
 }
 
Index: uspace/lib/math/arch/mips32eb/include/libarch/math.h
===================================================================
--- uspace/lib/math/arch/mips32eb/include/libarch/math.h	(revision 1433ecda9b732f3f185f902feb26826ec2496e03)
+++ uspace/lib/math/arch/mips32eb/include/libarch/math.h	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
@@ -51,4 +51,5 @@
 #include <log.h>
 #include <log10.h>
+#include <log2.h>
 #include <mathtypes.h>
 #include <modf.h>
@@ -212,4 +213,14 @@
 }
 
+static inline float32_t log2_f32(float32_t val)
+{
+	return float32_log2(val);
+}
+
+static inline float64_t log2_f64(float64_t val)
+{
+	return float64_log2(val);
+}
+
 static inline float64_t modf_f64(float64_t value, float64_t *iptr)
 {
@@ -440,4 +451,14 @@
 {
 	return log10_f32(val);
+}
+
+static inline float64_t log2(float64_t val)
+{
+	return log2_f64(val);
+}
+
+static inline float32_t log2f(float32_t val)
+{
+	return log2_f32(val);
 }
 
Index: uspace/lib/math/arch/ppc32/include/libarch/math.h
===================================================================
--- uspace/lib/math/arch/ppc32/include/libarch/math.h	(revision 1433ecda9b732f3f185f902feb26826ec2496e03)
+++ uspace/lib/math/arch/ppc32/include/libarch/math.h	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
@@ -51,4 +51,5 @@
 #include <log.h>
 #include <log10.h>
+#include <log2.h>
 #include <mathtypes.h>
 #include <modf.h>
@@ -212,4 +213,14 @@
 }
 
+static inline float32_t log2_f32(float32_t val)
+{
+	return float32_log2(val);
+}
+
+static inline float64_t log2_f64(float64_t val)
+{
+	return float64_log2(val);
+}
+
 static inline float64_t modf_f64(float64_t value, float64_t *iptr)
 {
@@ -440,4 +451,14 @@
 {
 	return log10_f32(val);
+}
+
+static inline float64_t log2(float64_t val)
+{
+	return log2_f64(val);
+}
+
+static inline float32_t log2f(float32_t val)
+{
+	return log2_f32(val);
 }
 
Index: uspace/lib/math/arch/riscv64/include/libarch/math.h
===================================================================
--- uspace/lib/math/arch/riscv64/include/libarch/math.h	(revision 1433ecda9b732f3f185f902feb26826ec2496e03)
+++ uspace/lib/math/arch/riscv64/include/libarch/math.h	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
@@ -50,4 +50,5 @@
 #include <log.h>
 #include <log10.h>
+#include <log2.h>
 #include <mathtypes.h>
 #include <modf.h>
@@ -211,4 +212,14 @@
 }
 
+static inline float32_t log2_f32(float32_t val)
+{
+	return float32_log2(val);
+}
+
+static inline float64_t log2_f64(float64_t val)
+{
+	return float64_log2(val);
+}
+
 static inline float64_t modf_f64(float64_t value, float64_t *iptr)
 {
@@ -439,4 +450,14 @@
 {
 	return log10_f32(val);
+}
+
+static inline float64_t log2(float64_t val)
+{
+	return log2_f64(val);
+}
+
+static inline float32_t log2f(float32_t val)
+{
+	return log2_f32(val);
 }
 
Index: uspace/lib/math/arch/sparc64/include/libarch/math.h
===================================================================
--- uspace/lib/math/arch/sparc64/include/libarch/math.h	(revision 1433ecda9b732f3f185f902feb26826ec2496e03)
+++ uspace/lib/math/arch/sparc64/include/libarch/math.h	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
@@ -51,4 +51,5 @@
 #include <log.h>
 #include <log10.h>
+#include <log2.h>
 #include <mathtypes.h>
 #include <modf.h>
@@ -212,4 +213,14 @@
 }
 
+static inline float32_t log2_f32(float32_t val)
+{
+	return float32_log2(val);
+}
+
+static inline float64_t log2_f64(float64_t val)
+{
+	return float64_log2(val);
+}
+
 static inline float64_t modf_f64(float64_t value, float64_t *iptr)
 {
@@ -440,4 +451,14 @@
 {
 	return log10_f32(val);
+}
+
+static inline float64_t log2(float64_t val)
+{
+	return log2_f64(val);
+}
+
+static inline float32_t log2f(float32_t val)
+{
+	return log2_f32(val);
 }
 
Index: uspace/lib/math/generic/log2.c
===================================================================
--- uspace/lib/math/generic/log2.c	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
+++ uspace/lib/math/generic/log2.c	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2018 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libmath
+ * @{
+ */
+/** @file
+ */
+
+#include <log2.h>
+#include <math.h>
+
+/** Base-2 logarithm (32-bit floating point)
+ *
+ * Compute base-2 logarithm value.
+ *
+ * @param arg Logarithm argument.
+ *
+ * @return Logarithm value.
+ *
+ */
+float32_t float32_log2(float32_t arg)
+{
+	return log_f32(arg) / M_LN2;
+}
+
+/** Base-2 logarithm (64-bit floating point)
+ *
+ * Compute base-2 logarithm value.
+ *
+ * @param arg Logarithm argument.
+ *
+ * @return Logarithm value.
+ *
+ */
+float64_t float64_log2(float64_t arg)
+{
+	return log_f64(arg) / M_LN2;
+}
+
+
+/** @}
+ */
Index: uspace/lib/math/include/log2.h
===================================================================
--- uspace/lib/math/include/log2.h	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
+++ uspace/lib/math/include/log2.h	(revision 38d8849c5dae9664aadfb5dfe635e66fd4bcb908)
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2018 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libmath
+ * @{
+ */
+/** @file
+ */
+
+#ifndef LIBMATH_LOG2_H_
+#define LIBMATH_LOG2_H_
+
+#include <mathtypes.h>
+
+extern float32_t float32_log2(float32_t);
+extern float64_t float64_log2(float64_t);
+
+#endif
+
+/** @}
+ */