Add tool (WIP)

tool/src/super_io.rs

@@ -0,0 +1,27 @@
+use hwio::{Io, Pio};
+
+pub struct SuperIo {
+    addr: Pio<u8>,
+    data: Pio<u8>,
+}
+
+impl SuperIo {
+    /// Create a new SuperIo. `base` identifies the address port. The data port
+    /// will be `base + 1`
+    pub fn new(base: u16) -> Self {
+        Self {
+            addr: Pio::new(base),
+            data: Pio::new(base + 1),
+        }
+    }
+
+    pub unsafe fn read(&mut self, addr: u8) -> u8 {
+        self.addr.write(addr);
+        self.data.read()
+    }
+
+    pub unsafe fn write(&mut self, addr: u8, data: u8) {
+        self.addr.write(addr);
+        self.data.write(data);
+    }
+}