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interrupts.rs
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interrupts.rs
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use crate::{gdt, hlt_loop, print, println};
use lazy_static::lazy_static;
use pic8259_simple::ChainedPics;
use spin;
use x86_64::structures::idt::{
self, InterruptDescriptorTable, InterruptStackFrame, PageFaultErrorCode,
};
pub const PIC_1_OFFSET: u8 = 32;
pub const PIC_2_OFFSET: u8 = PIC_1_OFFSET + 8;
#[derive(Debug, Clone, Copy)]
#[repr(u8)]
pub enum InterruptIndex {
Timer = PIC_1_OFFSET,
Keyboard,
}
impl InterruptIndex {
fn as_u8(self) -> u8 {
self as u8
}
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) });
lazy_static! {
static ref IDT: InterruptDescriptorTable = {
let mut idt = InterruptDescriptorTable::new();
idt.breakpoint.set_handler_fn(breakpoint_handler);
idt.page_fault.set_handler_fn(page_fault_handler);
unsafe {
idt.double_fault
.set_handler_fn(double_fault_handler)
.set_stack_index(gdt::DOUBLE_FAULT_IST_INDEX);
}
idt::set_default_handler!(&mut idt, default_handler, 32..);
idt
};
}
pub fn init_idt() {
IDT.load();
}
fn default_handler(stack_frame: &mut InterruptStackFrame, index: u8) {
if index == 32 {
print!("{} ", index);
} else {
println!("INTERRUPT {}: \n{:#?}", index, stack_frame);
}
unsafe {
PICS.lock().notify_end_of_interrupt(index);
}
}
extern "x86-interrupt" fn breakpoint_handler(stack_frame: &mut InterruptStackFrame) {
println!("EXCEPTION: BREAKPOINT\n{:#?}", stack_frame);
}
extern "x86-interrupt" fn page_fault_handler(
stack_frame: &mut InterruptStackFrame,
error_code: PageFaultErrorCode,
) {
use x86_64::registers::control::Cr2;
println!("EXCEPTION: PAGE FAULT");
println!("Accessed Address: {:?}", Cr2::read());
println!("Error Code: {:?}", error_code);
println!("{:#?}", stack_frame);
hlt_loop();
}
extern "x86-interrupt" fn double_fault_handler(
stack_frame: &mut InterruptStackFrame,
_error_code: u64,
) -> ! {
panic!("EXCEPTION: DOUBLE FAULT\n{:#?}", stack_frame);
}
extern "x86-interrupt" fn timer_interrupt_handler(_stack_frame: &mut InterruptStackFrame) {
print!(".");
unsafe {
PICS.lock()
.notify_end_of_interrupt(InterruptIndex::Timer.as_u8());
}
}
extern "x86-interrupt" fn keyboard_interrupt_handler(_stack_frame: &mut InterruptStackFrame) {
use x86_64::instructions::port::Port;
let mut port = Port::new(0x60);
let scancode: u8 = unsafe { port.read() };
crate::task::keyboard::add_scancode(scancode);
unsafe {
PICS.lock()
.notify_end_of_interrupt(InterruptIndex::Keyboard.as_u8());
}
}
#[test_case]
fn test_breakpoint_exception() {
// invoke a breakpoint exception
x86_64::instructions::interrupts::int3();
}