164 lines
4.6 KiB
Rust
164 lines
4.6 KiB
Rust
use crate::{
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arch::{drivers::vga::WRITER, gdt},
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kernel_state::KERNEL_STATE,
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print, println,
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rhai_shell::KEYBUFF,
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};
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use cpuio::outb;
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use pic8259::ChainedPics;
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use spin::Lazy;
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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 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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/// Interrupt offsets.
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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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// SecondInterrupt = PIC_2_OFFSET,
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Cmos = 0x70,
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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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static IDT: Lazy<InterruptDescriptorTable> = Lazy::new(|| {
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let mut idt = InterruptDescriptorTable::new();
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idt.breakpoint.set_handler_fn(breakpoint_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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// This gives fast interrupts
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set_pit_frequency(1000);
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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[6].set_handler_fn(floppy_disk_interrupt_handler);
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idt
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});
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extern "x86-interrupt" fn breakpoint_handler(stack_frame: InterruptStackFrame) {
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println!("EXCEPTION: BREAKPOINT\n{:#?}", stack_frame);
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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!(
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"EXCEPTION: Error code{}\nDOUBLE FAULT\n{:#?}",
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error_code, stack_frame
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);
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}
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extern "x86-interrupt" fn timer_interrupt_handler(_stack_frame: InterruptStackFrame) {
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kernel::tick();
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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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use crate::keyboard::{
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CustomLayout, CustomScancodeSet, DecodedKey, DecodedKeyKind, HandleControl, KeyCode,
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Keyboard,
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};
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use spin::Mutex;
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use x86_64::instructions::port::Port;
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static KEYBOARD: Lazy<Mutex<Keyboard<CustomLayout, CustomScancodeSet>>> = Lazy::new(|| {
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Mutex::new(Keyboard::new(
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CustomLayout::new_us104key(),
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CustomScancodeSet::default(),
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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(0x60);
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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 {
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kind: DecodedKeyKind::Unicode,
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value: character,
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} => {
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match character {
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// Backspace
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8 => {
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WRITER.lock().backspace();
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KEYBUFF.lock().push(8_u8 as _);
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// print!(" ");
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// WRITER.lock().backspace();
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}
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0x5E => KERNEL_STATE.lock().shutdown(),
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_ => {
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let mut buff = KEYBUFF.lock();
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buff.push(character as u8 as char);
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print!("{}", char::try_from(character).unwrap());
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}
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}
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}
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DecodedKey {
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kind: DecodedKeyKind::RawKey,
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value: key,
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} => match KeyCode::from(key) {
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KeyCode::AltLeft => {}
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KeyCode::AltRight => {}
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_ => {
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print!("{:?}", KeyCode::from(key))
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}
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},
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// Register a keyboard interrupt handler for the given scancode.
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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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extern "x86-interrupt" fn floppy_disk_interrupt_handler(_stack_frame: InterruptStackFrame) {
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println!("EXCEPTION: FLOPPY DISK");
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}
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pub fn init_idt() {
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IDT.load();
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}
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fn set_pit_frequency(freq: u32) {
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let divisor: u16 = (1193180 / freq).try_into().unwrap();
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unsafe {
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outb(0x36, 0x43);
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outb((divisor & 0xFF) as u8, 0x40);
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outb((divisor >> 8) as u8, 0x40);
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}
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}
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