fix(pit): fix interrupt race conditions

Signed-off-by: Julien CLEMENT <julien.clement@epita.fr>

src/interrupts.rs

@@ -66,4 +66,7 @@ extern "x86-interrupt" fn timer_interrupt_handler(
     _stack_frame: InterruptStackFrame)
 {
     print!(".");
+    unsafe {
+        PICS.lock().notify_end_of_interrupt(InterruptIndex::Timer.as_u8());
+    }
 }

src/lib.rs

@@ -14,7 +14,13 @@ use vga::{Color, ColorCode};
 fn panic_handler(info: &PanicInfo) -> ! {
     vga::change_color(ColorCode::new(Color::LightRed, Color::Black));
     println!("{}", info);
-    loop {}
+    hlt_loop();
+}
+
+pub fn hlt_loop() -> ! {
+    loop {
+        x86_64::instructions::hlt();
+    }
 }
 
 pub fn init() {

src/serial.rs

@@ -35,10 +35,13 @@ lazy_static! {
 #[doc(hidden)]
 pub fn _print(args: ::core::fmt::Arguments) {
     use core::fmt::Write;
-    SERIAL1
-        .lock()
-        .write_fmt(args)
-        .expect("Printing to serial failed");
+    use x86_64::instructions::interrupts;
+    interrupts::without_interrupts(|| {
+        SERIAL1
+            .lock()
+            .write_fmt(args)
+            .expect("Printing to serial failed");
+    });
 }
 
 /// Prints to the host through the serial interface.

src/vga.rs

@@ -28,7 +28,11 @@ macro_rules! println {
 #[doc(hidden)]
 pub fn _print(args: fmt::Arguments) {
     use core::fmt::Write;
-    WRITER.lock().write_fmt(args).unwrap();
+    use x86_64::instructions::interrupts;
+
+    interrupts::without_interrupts(|| {
+        WRITER.lock().write_fmt(args).unwrap();
+    });
 }
 pub fn change_color(color: ColorCode) {
     WRITER.lock().change_color(color)