PCI driver WIP

drivers/pcid/src/pci/bar.rs

@@ -0,0 +1,18 @@
+#[derive(Debug)]
+pub enum PciBar {
+    None,
+    Memory(u32),
+    Port(u16)
+}
+
+impl From<u32> for PciBar {
+    fn from(bar: u32) -> Self {
+        if bar & 0xFFFFFFFC == 0 {
+            PciBar::None
+        } else if bar & 1 == 0 {
+            PciBar::Memory(bar & 0xFFFFFFF0)
+        } else {
+            PciBar::Port((bar & 0xFFFC) as u16)
+        }
+    }
+}