diff --git a/xtoskrnl/CMakeLists.txt b/xtoskrnl/CMakeLists.txt
index 61c28b3..bab25a1 100644
--- a/xtoskrnl/CMakeLists.txt
+++ b/xtoskrnl/CMakeLists.txt
@@ -36,6 +36,7 @@ list(APPEND XTOSKRNL_SOURCE
     ${XTOSKRNL_SOURCE_DIR}/rtl/atomic.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/byteswap.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/intrin.c
+    ${XTOSKRNL_SOURCE_DIR}/rtl/ioreg.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/memory.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/plist.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/string.c
diff --git a/xtoskrnl/rtl/ioreg.c b/xtoskrnl/rtl/ioreg.c
new file mode 100644
index 0000000..e03e495
--- /dev/null
+++ b/xtoskrnl/rtl/ioreg.c
@@ -0,0 +1,124 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/rtl/ioreg.c
+ * DESCRIPTION:     I/O registers related routines
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#include <xtos.h>
+
+
+/**
+ * Reads a byte from a specified register address.
+ *
+ * @param Register
+ *        Supplies a pointer to register address holding data to read.
+ *
+ * @return This routine returns UCHAR byte read from the register.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+UCHAR
+RtlReadRegisterByte(IN VOLATILE PUCHAR Register)
+{
+    return *Register;
+}
+
+/**
+ * Reads a byte from a specified register address.
+ *
+ * @param Register
+ *        Supplies a pointer to register address holding data to read.
+ *
+ * @return This routine returns ULONG byte read from the register.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+ULONG
+RtlReadRegisterLong(IN VOLATILE PULONG Register)
+{
+    return *Register;
+}
+
+/**
+ * Reads a byte from a specified register address.
+ *
+ * @param Register
+ *        Supplies a pointer to register address holding data to read.
+ *
+ * @return This routine returns USHORT byte read from the register.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+USHORT
+RtlReadRegisterShort(IN VOLATILE PUSHORT Register)
+{
+    return *Register;
+}
+
+/**
+ * Writes a byte into a specified register address.
+ *
+ * @param Register
+ *        Supplies a pointer to register address where data will be written.
+ *
+ * @param Value
+ *        Supplies a new UCHAR value that will be stored into a register.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+RtlWriteRegisterByte(IN PUSHORT Register,
+                     IN UCHAR Value)
+{
+    HlIoPortOutByte((USHORT)(ULONG_PTR)Register, Value);
+}
+
+/**
+ * Writes a byte into a specified register address.
+ *
+ * @param Register
+ *        Supplies a pointer to register address where data will be written.
+ *
+ * @param Value
+ *        Supplies a new ULONG value that will be stored into a register.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+RtlWriteRegisterLong(IN PUSHORT Register,
+                     IN ULONG Value)
+{
+    HlIoPortOutLong((USHORT)(ULONG_PTR)Register, Value);
+}
+
+/**
+ * Writes a byte into a specified register address.
+ *
+ * @param Register
+ *        Supplies a pointer to register address where data will be written.
+ *
+ * @param Value
+ *        Supplies a new USHORT value that will be stored into a register.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+RtlWriteRegisterShort(IN PUSHORT Register,
+                      IN USHORT Value)
+{
+    HlIoPortOutShort((USHORT)(ULONG_PTR)Register, Value);
+}