127 lines
3.8 KiB
Rust
127 lines
3.8 KiB
Rust
use crate::gdt;
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use crate::hlt_loop;
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use crate::vga::{self, Color, ColorCode};
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use crate::{print, println};
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use lazy_static::lazy_static;
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use pc_keyboard::{layouts, DecodedKey, HandleControl, Keyboard, ScancodeSet1};
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use pic8259::ChainedPics;
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use spin::{self, Mutex};
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use x86_64::instructions::port::Port;
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use x86_64::structures::idt::PageFaultErrorCode;
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use x86_64::structures::idt::{InterruptDescriptorTable, InterruptStackFrame};
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pub const PIC_1_OFFSET: u8 = 32;
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pub const PIC_2_OFFSET: u8 = PIC_1_OFFSET + 8;
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pub const PS2_CONTROLLER_PORT: u16 = 0x60;
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#[derive(Debug, Clone, Copy)]
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#[repr(u8)]
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pub enum InterruptIndex {
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Timer = PIC_1_OFFSET,
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Keyboard,
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}
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impl InterruptIndex {
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fn as_u8(self) -> u8 {
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self as u8
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}
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fn as_usize(self) -> usize {
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usize::from(self.as_u8())
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}
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}
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pub static PICS: spin::Mutex<ChainedPics> =
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spin::Mutex::new(unsafe { ChainedPics::new(PIC_1_OFFSET, PIC_2_OFFSET) });
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lazy_static! {
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static ref IDT: InterruptDescriptorTable = {
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let mut idt = InterruptDescriptorTable::new();
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idt.breakpoint.set_handler_fn(breakpoint_handler);
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idt.page_fault.set_handler_fn(page_fault_handler);
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unsafe {
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idt.double_fault
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.set_handler_fn(double_fault_handler)
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.set_stack_index(gdt::DOUBLE_FAULT_IST_INDEX);
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}
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idt[InterruptIndex::Timer.as_usize()].set_handler_fn(timer_interrupt_handler);
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idt[InterruptIndex::Keyboard.as_usize()].set_handler_fn(keyboard_interrupt_handler);
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idt
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};
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}
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pub fn init_idt() {
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println!("Loading IDT");
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IDT.load();
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println!("Initializing PIC");
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unsafe { PICS.lock().initialize() };
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println!("Enabling interrupts");
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x86_64::instructions::interrupts::enable();
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}
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extern "x86-interrupt" fn breakpoint_handler(stack_frame: InterruptStackFrame) {
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let color: vga::ColorCode = vga::get_color();
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vga::change_color(ColorCode::new(Color::Pink, Color::Black));
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println!("EXCEPTION: BREAKPOINT\n{:#?}", stack_frame);
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vga::change_color(color);
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}
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extern "x86-interrupt" fn page_fault_handler(
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stack_frame: InterruptStackFrame,
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error_code: PageFaultErrorCode,
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) {
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let color: vga::ColorCode = vga::get_color();
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vga::change_color(ColorCode::new(Color::LightRed, Color::Black));
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use x86_64::registers::control::Cr2;
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println!("EXCEPTION: PAGE FAULT");
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println!("Accessed Address: {:?}", Cr2::read());
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println!("Error Code: {:?}", error_code);
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println!("{:#?}", stack_frame);
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vga::change_color(color);
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hlt_loop();
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}
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extern "x86-interrupt" fn double_fault_handler(
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stack_frame: InterruptStackFrame,
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_error_code: u64,
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) -> ! {
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panic!("EXCEPTION: DOUBLE FAULT\n{:#?}", stack_frame);
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}
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extern "x86-interrupt" fn timer_interrupt_handler(_stack_frame: InterruptStackFrame) {
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// print!(".");
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unsafe {
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PICS.lock()
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.notify_end_of_interrupt(InterruptIndex::Timer.as_u8());
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}
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}
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extern "x86-interrupt" fn keyboard_interrupt_handler(_stack_frame: InterruptStackFrame) {
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lazy_static! {
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static ref KEYBOARD: Mutex<Keyboard<layouts::Us104Key, ScancodeSet1>> = Mutex::new(
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Keyboard::new(layouts::Us104Key, ScancodeSet1, HandleControl::Ignore)
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);
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}
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let mut keyboard = KEYBOARD.lock();
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let mut port = Port::new(PS2_CONTROLLER_PORT);
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let scancode: u8 = unsafe { port.read() };
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if let Ok(Some(key_event)) = keyboard.add_byte(scancode) {
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if let Some(key) = keyboard.process_keyevent(key_event) {
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match key {
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DecodedKey::Unicode(character) => print!("{}", character),
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DecodedKey::RawKey(key) => print!("{:?}", key),
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}
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}
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}
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unsafe {
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PICS.lock()
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.notify_end_of_interrupt(InterruptIndex::Keyboard.as_u8());
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}
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}
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