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#![no_std]
#![no_main]
#![feature(panic_info_message)]
#![feature(alloc_error_handler)]

use crate::drivers::{GPU_DEVICE, KEYBOARD_DEVICE, MOUSE_DEVICE};

extern crate alloc;

#[macro_use]
extern crate bitflags;

#[path = "boards/qemu.rs"]
mod board;

#[macro_use]
mod console;
mod config;
mod drivers;
mod fs;
mod gui;
mod lang_items;
mod mm;
mod sbi;
mod sync;
mod syscall;
mod task;
mod timer;
mod trap;

// use syscall::create_desktop; //for test

core::arch::global_asm!(include_str!("entry.asm"));

fn clear_bss() {
    extern "C" {
        fn sbss();
        fn ebss();
    }
    unsafe {
        core::slice::from_raw_parts_mut(sbss as usize as *mut u8, ebss as usize - sbss as usize)
            .fill(0);
    }
}

use lazy_static::*;
use sync::UPIntrFreeCell;

lazy_static! {
    pub static ref DEV_NON_BLOCKING_ACCESS: UPIntrFreeCell<bool> =
        unsafe { UPIntrFreeCell::new(false) };
}

#[no_mangle]
pub fn rust_main() -> ! {
    clear_bss();
    mm::init();
    println!("KERN: init gpu");
    GPU_DEVICE.clone();
    println!("KERN: init keyboard");
    KEYBOARD_DEVICE.clone();
    println!("KERN: init mouse");
    MOUSE_DEVICE.clone();
    println!("KERN: init trap");
    trap::init();
    trap::enable_timer_interrupt();
    timer::set_next_trigger();
    board::device_init();
    fs::list_apps();
    //syscall::create_desktop(); //for test
    task::add_initproc();
    *DEV_NON_BLOCKING_ACCESS.exclusive_access() = true;
    task::run_tasks();
    panic!("Unreachable in rust_main!");
}