rust-operating-system/src/main.rs

// #![feature(abi_x86_interrupt, asm)]
#![no_std]
#![no_main]

#![feature(custom_test_frameworks)]
#![test_runner(crate::test_runner)]
#![reexport_test_harness_main = "test_main"]

#[macro_use]
mod vga_buffer;
#[macro_use]
mod serial;

use core::panic::PanicInfo;

#[panic_handler]
fn panic(info: &PanicInfo) -> ! {
    println!("{info}");
    loop {}
}

#[no_mangle]
pub extern "C" fn _start() -> ! {
    #[cfg(test)]
    test_main();

    println!("Gamarjoba, munde!");
    loop {}
}

#[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); // isa-debug-exit port, see Cargo.toml
        port.write(exit_code as u32);
    }
}

#[cfg(test)]
fn test_runner(tests: &[&dyn Fn()]) {
    serial_println!("Running {} test(s)", tests.len());
    for test in tests {
        test();
    }

    exit_qemu(QemuExitCode::Success);
}

#[test_case]
fn basic_test() {
    serial_print!("Trivial test... ");
    assert_eq!(5, 5);
    serial_println!("[ok]");
}