diff --git a/src/io.h b/src/io.h
new file mode 100644
index 0000000..ab5ce4a
--- /dev/null
+++ b/src/io.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#include "kint.h"
+
+void outb(ushort port, uchar val);
+uchar inb(ushort port);
+ushort inw(ushort port);
+
+void *memset(void *s, int c, size_t n);
+void *memcpy(void *dest, const void *src, size_t n);
+
+void io_wait();