diff --git a/zion/common/port.h b/zion/common/port.h
new file mode 100644
index 0000000..4919ff4
--- /dev/null
+++ b/zion/common/port.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <stdint.h>
+
+static inline uint8_t inb(uint16_t port) {
+  uint8_t result;
+  asm volatile("inb %1, %0" : "=a"(result) : "Nd"(port));
+  return result;
+}
+
+static inline void outb(uint16_t port, uint8_t value) {
+  asm volatile("outb %0, %1" ::"a"(value), "Nd"(port));
+}
diff --git a/zion/zion.cpp b/zion/zion.cpp
index c22c920..8e59f54 100644
--- a/zion/zion.cpp
+++ b/zion/zion.cpp
@@ -1,10 +1,8 @@
 #include <stdint.h>
 
-#define COM1 0x3f8
+#include "common/port.h"
 
-void outb(uint16_t port, uint8_t value) {
-  asm volatile("outb %0, %1" ::"a"(value), "Nd"(port));
-}
+#define COM1 0x3f8
 
 extern "C" void zion() {
   outb(COM1, 'a');