Proper Qemu Test Exits

Cargo.toml

@@ -7,6 +7,7 @@ edition = "2021"
 bootloader = "0.9"
 volatile = "0.2.6"
 spin = "0.5.2"
+x86_64 = "0.14.2"
 
 #// DO NOTE THAT IN CARGO AS OF TO MY KNOWLEDGE 2019 AND EVEN NOW IN 2024 
 #// THERE IS A BUG IN CARGO WHERE THERE ARE "duplicate lang item" ERRORS 
@@ -25,4 +26,5 @@ version = "1.0"
 features = ["spin_no_std"]
 
 [package.metadata.bootimage]
-test-args = ["-device", "isa-debug-exit,iobase=0xf4,iosize=0x04"]
+test-args = ["-device", "isa-debug-exit,iobase=0xf4,iosize=0x04"]
+test-success-exit-code = 33         # (0x10 << 1) | 1

src/main.rs

@@ -57,16 +57,34 @@ pub extern "C" fn _start() -> ! {
 // ON CARGO TEST IN SOME CASES. TO FIX REMOVE/COMMENT OUT THE ' panic = "abort" ' 
 // FOR A PROFILE IN THE CARGO.TOML FILE
 #[cfg(test)]
-pub fn test_runner(tests: &[&dyn Fn()]) {
+fn test_runner(tests: &[&dyn Fn()]) {
     println!("Running {} tests", tests.len());
     for test in tests {
         test();
     }
+    //new
+    exit_qemu(QemuExitCode::Success);
 }
 
 #[test_case]
 fn trivial_assertion() {
     print!("trivial assertion... ");
     assert_eq!(1, 1);
     println!("[ok]");
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[repr(u32)]
+pub enum QemuExitCode {
+    Success = 0x10,
+    Failed = 0x11,
+}
+
+pub fn exit_qemu(exit_code: QemuExitCode) {
+    use x86_64::instructions::port::Port;
+
+    unsafe {
+        let mut port = Port::new(0xf4);
+        port.write(exit_code as u32);
+    }
 }

src/vga_buffer.rs

@@ -148,7 +148,7 @@ use lazy_static::lazy_static;
 lazy_static! {
     pub static ref WRITER: Mutex<Writer> = Mutex::new(Writer {
         column_position: 0,
-        color_code: ColorCode::new(Color::Yellow, Color::Black),
+        color_code: ColorCode::new(Color::White, Color::Black),
         buffer: unsafe { &mut *(0xb8000 as *mut Buffer) },
     });
 }