#![no_std]
#![no_main]
#![feature(custom_test_frameworks)]
#![test_runner(rustos::test_runner)]
#![reexport_test_harness_main = "test_main"]

use core::panic::PanicInfo;
use rustos::println;

// fn _start ::: called on start
#[unsafe(no_mangle)] // SAFETY: make sure no other global fn _start exists
pub extern "C" fn _start() -> ! {
    println!("Hello World{}", "!");
    rustos::init(); // initializes kernel

    #[cfg(test)]
    test_main();

    println!("Hey, it didn't crash!");
    rustos::hlt_loop();
}

// fn panic ::: prints panic message
// info: &PanicInfo :param: passed by panic_handler, includes panic information
#[panic_handler]
fn panic(info: &PanicInfo) -> ! {
    #[cfg(test)]
    rustos::test_panic_handler(info);
    #[cfg(not(test))]
    {
        println!("{}", info);
        rustos::hlt_loop();
    };
}