Begin porting the double faults post

src/lib.rs

@@ -15,6 +15,7 @@ extern crate std;
 
 pub mod serial;
 pub mod vga_buffer;
+pub mod tss;
 
 pub unsafe fn exit_qemu() {
     use x86_64::instructions::port::Port;

src/main.rs

@@ -21,8 +21,12 @@ pub extern "C" fn _start() -> ! {
 
     init_idt();
 
-    // invoke a breakpoint exception
-    x86_64::instructions::int3();
+    fn stack_overflow() {
+        stack_overflow(); // for each recursion, the return address is pushed
+    }
+
+    // trigger a stack overflow
+    stack_overflow();
 
     println!("It did not crash!");
     loop {}
@@ -43,6 +47,7 @@ lazy_static! {
     static ref IDT: Idt = {
         let mut idt = Idt::new();
         idt.breakpoint.set_handler_fn(breakpoint_handler);
+        idt.double_fault.set_handler_fn(double_fault_handler);
         idt
     };
 }
@@ -54,3 +59,10 @@ pub fn init_idt() {
 extern "x86-interrupt" fn breakpoint_handler(stack_frame: &mut ExceptionStackFrame) {
     println!("EXCEPTION: BREAKPOINT\n{:#?}", stack_frame);
 }
+
+extern "x86-interrupt" fn double_fault_handler(
+    stack_frame: &mut ExceptionStackFrame, _error_code: u64)
+{
+    println!("EXCEPTION: DOUBLE FAULT\n{:#?}", stack_frame);
+    loop {}
+}

src/tss.rs

@@ -0,0 +1,14 @@
+use x86_64::structures::tss::TaskStateSegment;
+
+static DOUBLE_FAULT_STACK: [u8; 4096] = [0; 4096];
+const DOUBLE_FAULT_IST_INDEX: usize = 0;
+
+pub fn init() {
+    let mut tss = TaskStateSegment::new();
+    tss.interrupt_stack_table[DOUBLE_FAULT_IST_INDEX] = {
+        let stack_start = &DOUBLE_FAULT_STACK as *const [u8; _] as usize;
+        let stack_size = DOUBLE_FAULT_STACK.len();
+        let stack_end = stack_start + stack_size;
+        stack_end
+    };
+}