diff --git a/window_hw_interface.hpp b/window_hw_interface.hpp
new file mode 100644
index 0000000..a9de4dd
--- /dev/null
+++ b/window_hw_interface.hpp
@@ -0,0 +1,34 @@
+#pragma once
+
+#include <cstdint>
+#include <utility>
+
+namespace blobs
+{
+
+/**
+ * Different LPC (or P2a) memory map implementations may require different
+ * mechanisms for specific tasks such as mapping the memory window or copying
+ * out data.
+ */
+class HardwareMapperInterface
+{
+  public:
+    virtual ~HardwareMapperInterface() = default;
+
+    /**
+     * Returns a windowOffset and windowSize if the requested window was mapped.
+     *
+     * TODO: If the length requested is too large, windowSize will be written
+     * with the max size that the BMC can map and returns false.
+     *
+     * @param[in] address - The address for mapping (passed to LPC window)
+     * @param[in] length - The length of the region
+     * @return windowOffset, windowSize - The offset into the window and
+     * length of the region.  On failure, length is set to 0.
+     */
+    virtual std::pair<std::uint32_t, std::uint32_t>
+        mapWindow(std::uint32_t address, std::uint32_t length) = 0;
+};
+
+} // namespace blobs