#![feature(lang_items)]
#![feature(const_fn)]
#![feature(const_unique_new)]
#![feature(unique)]
#![no_std]

extern crate rlibc;
extern crate volatile;
extern crate spin;
extern crate multiboot2;

#[macro_use]
mod vga_buffer;

#[no_mangle]
pub extern fn rust_main(multiboot_information_address: usize) {
    vga_buffer::clear_screen();
    println!("Hello World{}", "!");

    let boot_info = unsafe{ multiboot2::load(multiboot_information_address) };
    let memory_map_tag = boot_info.memory_map_tag()
        .expect("Memory map tag required");

    println!("memory areas:");
    for area in memory_map_tag.memory_areas() {
        println!("    start: 0x{:x}, length: 0x{:x}",
            area.base_addr, area.length);
    }

    loop{}
}

#[lang = "eh_personality"] extern fn eh_personality() {}

#[lang = "panic_fmt"]
#[no_mangle]
pub extern fn panic_fmt(fmt: core::fmt::Arguments, file: &'static str, line: u32) -> ! {
    println!("\n\nPANIC in {} at line {}:", file, line);
    println!("    {}", fmt);
    loop{}
}