akern-gkgoat-fork/ableos/src/kmain.rs

#![allow(clippy::empty_loop)]
use crate::{
    arch::{
        drivers::graphics::GraphicsBuffer,
        init,
        memory::{self, translate_addr},
        sloop,
    },
    driver_traits::{graphics::Graphics, serial::Serial},
    experiments::systeminfo::{KERNEL_VERSION, RELEASE_TYPE},
    keyboard::DecodedKey,
    relib::math::rand::{linearshift::LinearShiftRegister, prand::PRand, RAND_HANDLE, RNG},
    serial_print, serial_println,
};
use bootloader::{entry_point, BootInfo};
use lazy_static::lazy_static;

use x86_64::{structures::paging::Page, VirtAddr};

#[no_mangle]
#[allow(unconditional_recursion)]
pub extern "C" fn stack_overflow() -> u8 {
    stack_overflow();
    // meme number
    69 // NOTE: Any specific reason for this number asside from memes?
}

lazy_static! {
    pub static ref KEY_BUFFER: [DecodedKey; 256] = [DecodedKey::RawKey(123); 256];
    pub static ref KEY_BUFFER_POINTER: u8 = 0;
}
// Defines the entry point
entry_point![kernel_main];
#[no_mangle]
pub fn kernel_main(boot_info: &'static BootInfo) -> ! {
    init::init();

    GraphicsBuffer::draw();
    GraphicsBuffer::hide_cursor();
    GraphicsBuffer::show_cursor();
    seed_rng();

    {
        use alloc::{vec, vec::Vec};
        let x: Vec<u8> = vec![1];
        println!("{:?}", x);
    }

    /* If AES is present then AES init rng as well
    // Maybe via a cfg
        AES::init_rng();

    */

    println!("{} v{}", RELEASE_TYPE, KERNEL_VERSION);

    {
        use crate::experiments::mail::MailBoxes;
        let mut x = MailBoxes::new();
        x.set_flag(1);
        x.set_flag(2);
        // x.dump_flags();
    }

    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) };

    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) };

    // stack_overflow();
    // crate::arch::shutdown();
    sloop()
}
// TODO: reimplement for the random handler
pub fn seed_rng() -> PRand {
    println!("Seeding PRNG");
    let data = TICK.lock();
    let mut rand = PRand::new();
    let seed = rand.rand();
    println!("{:?}", seed);
    rand.seed(*data);
    println!("Seeded PRNG");
    rand
}
lazy_static! {
    // TODO: should have a sin wave influence contribution to entropy
    pub static ref TICK: spin::Mutex<u64> = spin::Mutex::new(0);
}
/// called by arch specific timers to tick up all kernel related functions
pub fn tick() {
    let mut data = TICK.lock();
    *data += 1;
    // serial_println!("{}", *data);
    RAND_HANDLE.lock().seed_entropy_timer(*data);
}
pub fn key_entropy(key: u8) {
    RAND_HANDLE.lock().seed_entropy_keyboard(key);
}