Loop on serial input

Fix issue with serial and cascade interrupts not being ackd

arch/x86_64/src/device/serial.rs

@@ -85,13 +85,15 @@ impl SerialPort {
     }
 
     pub fn on_receive(&mut self) {
-        let data = self.data.read();
+        while self.line_sts().contains(INPUT_FULL) {
+            let data = self.data.read();
 
-        extern {
-            fn debug_input(byte: u8);
+            extern {
+                fn debug_input(byte: u8);
+            }
+
+            unsafe { debug_input(data) };
         }
-
-        unsafe { debug_input(data) };
     }
 }
 

arch/x86_64/src/interrupt/irq.rs

@@ -50,14 +50,17 @@ interrupt!(keyboard, {
 
 interrupt!(cascade, {
     // No need to do any operations on cascade
+    pic::MASTER.ack();
 });
 
 interrupt!(com2, {
     COM2.lock().on_receive();
+    pic::MASTER.ack();
 });
 
 interrupt!(com1, {
     COM1.lock().on_receive();
+    pic::MASTER.ack();
 });
 
 interrupt!(lpt2, {