1 files changed, 24 insertions, 6 deletions
diff --git a/i686/sys/io.hpp b/i686/sys/io.hpp
index bea9323..9759a3a 100644
--- a/i686/sys/io.hpp
+++ b/i686/sys/io.hpp
@@ -1,15 +1,33 @@
 #pragma once
 
+/**
+ * Ports provide communication with devices on the x86 IO bus.
+ */
 template <typename T, unsigned short port> struct Port {
-  static void
-  out(T val, unsigned short offset = 0)
+  /**
+   * Read value from port
+   */
+  static T
+  in(unsigned short offset = 0)
   {
-    outb(val, port + offset);
+    if constexpr (sizeof(T) == sizeof(unsigned char)) return inb(port + offset);
+    else if constexpr (sizeof(T) == sizeof(unsigned short))
+      return inw(port + offset);
+    else if constexpr (sizeof(T) == sizeof(unsigned int))
+      return inl(port + offset);
   }
 
-  static auto
-  in(unsigned short offset = 0)
+  /**
+   * Write value to port
+   */
+  static void
+  out(T val, unsigned short offset = 0)
   {
-    return inb(port + offset);
+    if constexpr (sizeof(T) == sizeof(unsigned char)) outb(val, port + offset);
+    else if constexpr (sizeof(T) == sizeof(unsigned short))
+      outw(val, port + offset);
+    else if constexpr (sizeof(T) == sizeof(unsigned int))
+      outl(val, port + offset);
   }
+
 };