Begin work for exceptions post

src/interrupts/idt.rs

@@ -0,0 +1,26 @@
+use x86::irq::IdtEntry;
+
+pub struct Idt([IdtEntry; 16]);
+
+impl Idt {
+    pub fn new() -> Idt {
+        Idt([IdtEntry::missing(); 16])
+    }
+
+    pub fn set_handler(&mut self, entry: usize, handler: extern fn()->!) {
+        let ptr = handler as usize;
+        self.0[entry] = IdtEntry::interrupt_gate(0x8, ptr as *const _);
+    }
+
+    pub unsafe fn load(&self) {
+        use x86::dtables::{DescriptorTablePointer, lidt};
+        use core::mem::size_of;
+
+        let ptr = DescriptorTablePointer{
+            base: self as *const _ as u64,
+            limit: (size_of::<Self>() - 1) as u16,
+        };
+
+        lidt(&ptr);
+    }
+}