diff --git a/src/hulk/pci.d b/src/hulk/pci.d
index f80a336..e3f6048 100644
--- a/src/hulk/pci.d
+++ b/src/hulk/pci.d
@@ -33,6 +33,13 @@ struct Pci
         return in32(IO_ADDR_CONFIG_DATA);
     }
 
+    private static void write_config_register(uint bus_id, uint device_idx, uint function_idx, uint register_id, uint value)
+    {
+        uint addr = 0x8000_0000u | (bus_id << 16u) | (device_idx << 11u) | (function_idx << 8u) | (register_id << 2u);
+        out32(IO_ADDR_CONFIG_ADDRESS, addr);
+        out32(IO_ADDR_CONFIG_DATA, value);
+    }
+
     private static void init_device(ubyte class_id, ubyte subclass_id, ubyte if_id)
     {
         switch (class_id)