PCI driver WIP

drivers/pcid/src/pci/bus.rs

@@ -0,0 +1,46 @@
+use super::{Pci, PciDev};
+
+pub struct PciBus<'pci> {
+    pub pci: &'pci Pci,
+    pub num: u8
+}
+
+impl<'pci> PciBus<'pci> {
+    pub fn devs(&'pci self) -> PciBusIter<'pci> {
+        PciBusIter::new(self)
+    }
+
+    pub unsafe fn read(&self, dev: u8, func: u8, offset: u8) -> u32 {
+        self.pci.read(self.num, dev, func, offset)
+    }
+}
+
+pub struct PciBusIter<'pci> {
+    bus: &'pci PciBus<'pci>,
+    num: u32
+}
+
+impl<'pci> PciBusIter<'pci> {
+    pub fn new(bus: &'pci PciBus<'pci>) -> Self {
+        PciBusIter {
+            bus: bus,
+            num: 0
+        }
+    }
+}
+
+impl<'pci> Iterator for PciBusIter<'pci> {
+    type Item = PciDev<'pci>;
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.num < 32 {
+            let dev = PciDev {
+                bus: self.bus,
+                num: self.num as u8
+            };
+            self.num += 1;
+            Some(dev)
+        } else {
+            None
+        }
+    }
+}