// Copyright 2015 Philipp Oppermann
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#![feature(no_std, lang_items)]
#![feature(const_fn, unique, core_str_ext)]
#![no_std]

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

#[macro_use]
mod vga_buffer;

#[no_mangle]
pub extern fn rust_main(multiboot_information_address: usize) {
    // ATTENTION: we have a very small stack and no guard page
    vga_buffer::clear_screen();
    println!("Hello World{}", "!");

    let boot_info = unsafe{ multiboot2::load(multiboot_information_address) };

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

    println!("kernel sections:");
    for section in boot_info.elf_sections_tag().unwrap().sections() {
        println!("    addr: 0x{:x}, size: 0x{:x}, flags: 0x{:x}",
            section.addr, section.size, section.flags);
    }

    loop{}
}

#[cfg(not(test))]
#[lang = "eh_personality"]
extern fn eh_personality() {}

#[cfg(not(test))]
#[lang = "panic_fmt"]
extern fn panic_fmt(fmt: core::fmt::Arguments, file: &str, line: u32) -> ! {
    println!("\n\nPANIC in {} at line {}:", file, line);
    println!("    {}", fmt);
    loop{}
}