JuliOS/src/interrupts/pic/mod.rs

use pic8259::ChainedPics;
use crate::{print, println};
use lazy_static::lazy_static;
use pc_keyboard::{layouts, DecodedKey, HandleControl, Keyboard, ScancodeSet1};
use x86_64::structures::idt::{InterruptStackFrame};
use x86_64::instructions::port::Port;
use spin::{self, Mutex};
pub use pit::timer_interrupt_handler;

pub mod pit;

pub const PIC_1_OFFSET: u8 = 32;
pub const PIC_2_OFFSET: u8 = PIC_1_OFFSET + 8;


pub const PS2_CONTROLLER_PORT: u16 = 0x60;

#[derive(Debug, Clone, Copy)]
#[repr(u8)]
pub enum InterruptIndex {
    Timer = PIC_1_OFFSET,
    Keyboard,
}

impl InterruptIndex {
    pub fn as_u8(self) -> u8 {
        self as u8
    }

    pub fn as_usize(self) -> usize {
        usize::from(self.as_u8())
    }
}

pub static PICS: spin::Mutex<ChainedPics> =
    spin::Mutex::new(unsafe { ChainedPics::new(PIC_1_OFFSET, PIC_2_OFFSET) });

pub fn init_pic() {
    println!("Initializing PIC");
    unsafe { PICS.lock().initialize() };
}


pub extern "x86-interrupt" fn keyboard_interrupt_handler(_stack_frame: InterruptStackFrame) {
    lazy_static! {
        static ref KEYBOARD: Mutex<Keyboard<layouts::Us104Key, ScancodeSet1>> = Mutex::new(
            Keyboard::new(layouts::Us104Key, ScancodeSet1, HandleControl::Ignore)
        );
    }

    let mut keyboard = KEYBOARD.lock();
    let mut port = Port::new(PS2_CONTROLLER_PORT);
    let scancode: u8 = unsafe { port.read() };

    if let Ok(Some(key_event)) = keyboard.add_byte(scancode) {
        if let Some(key) = keyboard.process_keyevent(key_event) {
            match key {
                DecodedKey::Unicode(character) => print!("{}", character),
                DecodedKey::RawKey(key) => print!("{:?}", key),
            }
        }
    }
    unsafe {
        PICS.lock()
            .notify_end_of_interrupt(InterruptIndex::Keyboard.as_u8());
    }
}