#![feature(ptr_internals)]
#![feature(lang_items)]
#![feature(const_fn)]
#![feature(alloc)]
#![feature(const_unique_new, const_atomic_usize_new)]
#![feature(unique)]
#![feature(allocator_api)]
#![feature(global_allocator)]
#![feature(abi_x86_interrupt)]
#![no_std]


#[macro_use]
extern crate alloc;

extern crate rlibc;
extern crate volatile;
extern crate spin;
extern crate multiboot2;
#[macro_use]
extern crate bitflags;
extern crate x86_64;
#[macro_use]
extern crate once;
extern crate linked_list_allocator;
#[macro_use]
extern crate lazy_static;
extern crate bit_field;

#[macro_use]    // println!
mod vga_buffer;
mod memory;
mod interrupts;
mod lang;

#[allow(dead_code)]
#[cfg(target_arch = "x86_64")]
#[path = "arch/x86_64/mod.rs"]
mod arch;

// The entry point of Rust kernel
#[no_mangle]
pub extern "C" 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) };
    arch::init();

    // set up guard page and map the heap pages
    let mut memory_controller = memory::init(boot_info);

    unsafe {
        HEAP_ALLOCATOR.lock().init(HEAP_START, HEAP_START + HEAP_SIZE);
    }

    // initialize our IDT
    interrupts::init(&mut memory_controller);

    for i in 0..10000 {
        format!("Some String");
    }

    // invoke a breakpoint exception
    x86_64::instructions::interrupts::int3();

    fn stack_overflow() {
        stack_overflow(); // for each recursion, the return address is pushed
    }

    // trigger a stack overflow
    stack_overflow();


    println!("It did not crash!");
    loop {}
}

use linked_list_allocator::LockedHeap;

pub const HEAP_START: usize = 0o_000_001_000_000_0000;
pub const HEAP_SIZE: usize = 100 * 1024; // 100 KiB

#[global_allocator]
static HEAP_ALLOCATOR: LockedHeap = LockedHeap::empty();