From 79efbdc5a0304dc8ba4d76f690ff236c855ba984 Mon Sep 17 00:00:00 2001
From: Greg Shuflin <greg.shuflin@protonmail.com>
Date: Sun, 3 Apr 2022 23:38:56 -0700
Subject: [PATCH] Starting to add interrupt handling

---
 src/interrupts.rs | 17 +++++++++++++++++
 src/main.rs       | 13 ++++++++++++-
 2 files changed, 29 insertions(+), 1 deletion(-)
 create mode 100644 src/interrupts.rs

diff --git a/src/interrupts.rs b/src/interrupts.rs
new file mode 100644
index 0000000..6cf20cd
--- /dev/null
+++ b/src/interrupts.rs
@@ -0,0 +1,17 @@
+use lazy_static::lazy_static;
+use x86_64::structures::idt::{InterruptDescriptorTable, InterruptStackFrame};
+
+lazy_static! {
+    static ref IDT: InterruptDescriptorTable = {
+        let mut idt = InterruptDescriptorTable::new();
+        idt.breakpoint.set_handler_fn(breakpoint_handler);
+        idt
+    };
+}
+pub fn init_idt() {
+    IDT.load();
+}
+
+extern "x86-interrupt" fn breakpoint_handler(stack_frame: InterruptStackFrame) {
+    println!("EXCEPTION: Breakpoint\n{:#?}", stack_frame);
+}
diff --git a/src/main.rs b/src/main.rs
index 0b6f0bb..28e0323 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,4 @@
-// #![feature(abi_x86_interrupt, asm)]
+#![feature(abi_x86_interrupt)]
 #![no_std]
 #![no_main]
 #![feature(custom_test_frameworks)]
@@ -9,6 +9,7 @@
 mod vga_buffer;
 #[macro_use]
 mod serial;
+mod interrupts;
 mod test_utils;
 
 #[cfg(not(test))]
@@ -24,6 +25,12 @@ pub extern "C" fn _start() -> ! {
     test_main();
 
     println!("Gamarjoba, munde!");
+    init();
+
+    // Deliberate breakpoint exception
+    x86_64::instructions::interrupts::int3();
+
+    println!("We're here now");
     loop {}
 }
 
@@ -36,3 +43,7 @@ fn basic_test() {
 fn basic_test2() {
     assert_eq!(4, 4);
 }
+
+pub fn init() {
+    interrupts::init_idt();
+}