From 4953b122d995696bc0b656b1c70c57ba5e96bcfd Mon Sep 17 00:00:00 2001
From: Dennis Kobert <dennis@kobert.dev>
Date: Fri, 15 Nov 2019 20:02:48 +0100
Subject: Implement timer interrupt handler

---
 kernel/src/interrupts/idt.rs        | 16 +++++++++-------
 kernel/src/interrupts/interrupts.rs |  8 ++++++++
 kernel/src/interrupts/mod.rs        | 18 +++++++++++++++++-
 3 files changed, 34 insertions(+), 8 deletions(-)
 create mode 100644 kernel/src/interrupts/interrupts.rs

diff --git a/kernel/src/interrupts/idt.rs b/kernel/src/interrupts/idt.rs
index e85ef5a..87f16c0 100644
--- a/kernel/src/interrupts/idt.rs
+++ b/kernel/src/interrupts/idt.rs
@@ -1,3 +1,4 @@
+use super::{exceptions, gdt, interrupts, Interrupts};
 use lazy_static::lazy_static;
 use x86_64::structures::idt::InterruptDescriptorTable;
 
@@ -5,19 +6,20 @@ lazy_static! {
     static ref IDT: InterruptDescriptorTable = {
         let mut idt = InterruptDescriptorTable::new();
         idt.breakpoint
-            .set_handler_fn(super::exceptions::breakpoint_handler);
+            .set_handler_fn(exceptions::breakpoint_handler);
         idt.segment_not_present
-            .set_handler_fn(super::exceptions::segment_not_present_handler);
+            .set_handler_fn(exceptions::segment_not_present_handler);
         idt.general_protection_fault
-            .set_handler_fn(super::exceptions::general_protection_fault_handler);
+            .set_handler_fn(exceptions::general_protection_fault_handler);
         unsafe {
             idt.double_fault
-                .set_handler_fn(super::exceptions::double_fault_handler)
-                .set_stack_index(super::gdt::DOUBLE_FAULT_IST_INDEX);
+                .set_handler_fn(exceptions::double_fault_handler)
+                .set_stack_index(gdt::DOUBLE_FAULT_IST_INDEX);
             idt.page_fault
-                .set_handler_fn(super::exceptions::page_fault_handler)
-                .set_stack_index(super::gdt::PAGE_FAULT_IST_INDEX);
+                .set_handler_fn(exceptions::page_fault_handler)
+                .set_stack_index(gdt::PAGE_FAULT_IST_INDEX);
         }
+        idt[Interrupts::Timer.as_usize()].set_handler_fn(interrupts::timer_handler);
 
         idt
     };
diff --git a/kernel/src/interrupts/interrupts.rs b/kernel/src/interrupts/interrupts.rs
new file mode 100644
index 0000000..6296375
--- /dev/null
+++ b/kernel/src/interrupts/interrupts.rs
@@ -0,0 +1,8 @@
+use super::Interrupts;
+use crate::io::qemu;
+use x86_64::structures::idt::{InterruptStackFrame, PageFaultErrorCode};
+
+pub extern "x86-interrupt" fn timer_handler(stack_frame: &mut InterruptStackFrame) {
+    panic!("Timer interrupt recieved\n\n")
+    // notify End of interrupt
+}
diff --git a/kernel/src/interrupts/mod.rs b/kernel/src/interrupts/mod.rs
index 087a59c..076c61c 100644
--- a/kernel/src/interrupts/mod.rs
+++ b/kernel/src/interrupts/mod.rs
@@ -1,8 +1,11 @@
 pub mod exceptions;
 pub mod gdt;
 pub mod idt;
+pub mod interrupts;
 
-#[repr(usize)]
+const INT_OFFSET: u8 = 32;
+
+#[repr(u8)]
 #[derive(PartialEq, Clone, Copy)]
 pub enum Interrupts {
     None,
@@ -11,4 +14,17 @@ pub enum Interrupts {
     NotPresent,
     Breakpoint,
     GeneralProtectionFault,
+
+    Timer = INT_OFFSET,
+    Keyboard = INT_OFFSET + 1,
+}
+
+impl Interrupts {
+    fn as_u8(self) -> u8 {
+        self as u8
+    }
+
+    fn as_usize(self) -> usize {
+        usize::from(self.as_u8())
+    }
 }
-- 
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