use crate::{arch::drivers::allocator, info};
use bootloader::{entry_point, BootInfo};
use x86_64::{
    instructions::hlt,
    {structures::paging::Page, VirtAddr},
};

pub mod drivers;
pub mod gdt;
pub mod init;
pub mod interrupts;
pub mod memory;

entry_point![start];
#[no_mangle]
pub fn start(boot_info: &'static BootInfo) -> ! {
    let phys_mem_offset = VirtAddr::new(boot_info.physical_memory_offset);

    let mut mapper = unsafe { memory::init(phys_mem_offset) };
    let mut frame_allocator =
        unsafe { memory::BootInfoFrameAllocator::init(&boot_info.memory_map) };
    if false {
        let page = Page::containing_address(VirtAddr::new(0xdeadbeaf000));
        memory::create_example_mapping(page, &mut mapper, &mut frame_allocator);

        let page_ptr: *mut u64 = page.start_address().as_mut_ptr();
        unsafe { page_ptr.offset(400).write_volatile(0xf021_f077_f065_804e) };
    }

    allocator::init_heap(&mut mapper, &mut frame_allocator).expect("heap initialization failed");
    // info!("{:?}", boot_info);
    crate::kmain::kernel_main();
}

#[allow(unused)]
pub fn shutdown() -> ! {
    info!("Shutting down");
    unsafe {
        cpuio::outw(0x2000, 0x604);
    }

    sloop();
}

pub fn sloop() -> ! {
    loop {
        hlt();
    }
}