Added and fixed some tests

Cargo.lock

@@ -14,6 +14,12 @@ version = "0.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc827186963e592360843fb5ba4b973e145841266c1357f7180c43526f2e5b61"
 
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
 [[package]]
 name = "bitflags"
 version = "2.6.0"
@@ -52,8 +58,9 @@ dependencies = [
  "bootloader",
  "lazy_static",
  "spin",
+ "uart_16550",
  "volatile 0.2.7",
- "x86_64",
+ "x86_64 0.15.1",
 ]
 
 [[package]]
@@ -77,6 +84,17 @@ dependencies = [
  "lock_api",
 ]
 
+[[package]]
+name = "uart_16550"
+version = "0.2.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "614ff2a87880d4bd4374722268598a970bbad05ced8bf630439417347254ab2e"
+dependencies = [
+ "bitflags 1.3.2",
+ "rustversion",
+ "x86_64 0.14.12",
+]
+
 [[package]]
 name = "volatile"
 version = "0.2.7"
@@ -96,7 +114,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "96cb6fd45bfeab6a5055c5bffdb08768bd0c069f1d946debe585bbb380a7c062"
 dependencies = [
  "bit_field",
- "bitflags",
+ "bitflags 2.6.0",
+ "rustversion",
+ "volatile 0.4.6",
+]
+
+[[package]]
+name = "x86_64"
+version = "0.15.1"
+source = "git+https://github.com/rust-osdev/x86_64?branch=fix%2Fstep-nightly-breakage#b4b66637b7306254447bde805789f1a2cf92b6e5"
+dependencies = [
+ "bit_field",
+ "bitflags 2.6.0",
  "rustversion",
  "volatile 0.4.6",
 ]

Cargo.toml

@@ -8,7 +8,8 @@ bootloader = "0.9"
 lazy_static = { version = "1.5.0", features = ["spin_no_std"] }
 spin = "0.9.8"
 volatile = "0.2.6"
-x86_64 = "0.14.2"
+x86_64 = { git = "https://github.com/rust-osdev/x86_64", branch = "fix/step-nightly-breakage" }
+uart_16550 = "0.2.0"
 
 # the profile used for `cargo build`
 [profile.dev]
@@ -19,5 +20,9 @@ panic = "abort" # disable stack unwinding on panic
 panic = "abort" # disable stack unwinding on panic
 
 [package.metadata.bootimage]
-test-args = ["-device", "isa-debug-exit,iobase=0xf4,iosize=0x04"]
+test-args = [
+    "-device", "isa-debug-exit,iobase=0xf4,iosize=0x04", "-serial", "stdio",
+    "-display", "none"
+]
 test-success-exit-code = 33
+test-timeout = 300          # (in seconds)

src/main.rs

@@ -6,6 +6,7 @@
 
 
 mod vga_buffer;
+mod serial;
 
 use core::panic::PanicInfo;
 
@@ -18,26 +19,36 @@ pub extern "C" fn _start() -> ! {
     loop {}
 }
 
+#[cfg(not(test))]
 #[panic_handler]
 fn panic(info: &PanicInfo) -> ! {
     println!("{}", info);
     loop {}
 }
 
+#[cfg(test)]
+#[panic_handler]
+fn panic(info: &PanicInfo) -> ! {
+    serial_println!("[failed]\n");
+    serial_println!("Error: {}\n", info);
+    exit_qemu(QemuExitCode::Failed);
+    loop {}
+}
+
 fn test_runner(tests: &[&dyn Fn()]) {
-    println!("Running {} tests", tests.len());
+    serial_println!("Running {} tests", tests.len());
     for test in tests {
         test();
     }
-    /// new
+
     exit_qemu(QemuExitCode::Success);
 }
 
 #[test_case]
 fn trivial_assertion() {
-    print!("trivial assertion... ");
+    serial_print!("trivial assertion... ");
     assert_eq!(1, 1);
-    println!("[ok]");
+    serial_println!("[ok]");
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]

src/serial.rs

@@ -0,0 +1,34 @@
+use uart_16550::SerialPort;
+use spin::Mutex;
+use lazy_static::lazy_static;
+
+lazy_static! {
+    pub static ref SERIAL1: Mutex<SerialPort> = {
+        let mut serial_port = unsafe { SerialPort::new(0x3F8) };
+        serial_port.init();
+        Mutex::new(serial_port)
+    };
+}
+
+#[doc(hidden)]
+pub fn _print(args: ::core::fmt::Arguments) {
+    use core::fmt::Write;
+    SERIAL1.lock().write_fmt(args).expect("Printing to serial failed");
+}
+
+/// Prints to the host through the serial interface.
+#[macro_export]
+macro_rules! serial_print {
+    ($($arg:tt)*) => {
+        $crate::serial::_print(format_args!($($arg)*));
+    };
+}
+
+/// Prints to the host through the serial interface, appending a newline.
+#[macro_export]
+macro_rules! serial_println {
+    () => ($crate::serial_print!("\n"));
+    ($fmt:expr) => ($crate::serial_print!(concat!($fmt, "\n")));
+    ($fmt:expr, $($arg:tt)*) => ($crate::serial_print!(
+        concat!($fmt, "\n"), $($arg)*));
+}