diff --git a/tools/io.hpp b/tools/io.hpp
index b3b2c79..8925418 100644
--- a/tools/io.hpp
+++ b/tools/io.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "internal/sys.hpp"
+#include "io_interface.hpp"
 
 #include <cstdint>
 #include <string>
@@ -8,37 +9,6 @@
 namespace host_tool
 {
 
-class HostIoInterface
-{
-  public:
-    virtual ~HostIoInterface() = default;
-
-    /**
-     * Attempt to read bytes from offset to the destination from the host
-     * memory device.
-     *
-     * @param[in] offset - offset into the host memory device.
-     * @param[in] length - the number of bytes to copy from source.
-     * @param[in] destination - where to write the bytes.
-     * @return true on success, false on failure (such as unable to initialize
-     * device).
-     */
-    virtual bool read(const std::size_t offset, const std::size_t length,
-                      void* const destination) = 0;
-
-    /**
-     * Attempt to write bytes from source to offset into the host memory device.
-     *
-     * @param[in] offset - offset into the host memory device.
-     * @param[in] length - the number of bytes to copy from source.
-     * @param[in] source - the souce of the bytes to copy to the memory device.
-     * @return true on success, false on failure (such as unable to initialize
-     * device).
-     */
-    virtual bool write(const std::size_t offset, const std::size_t length,
-                       const void* const source) = 0;
-};
-
 class DevMemDevice : public HostIoInterface
 {
   public: