### Initialize and Configure IOAPIC

Source: https://github.com/kwzhao/x2apic-rs/blob/master/README.md

Initializes the IOAPIC and configures a redirection table entry for a specific IRQ. Ensure the IOAPIC's MMIO address is mapped correctly before use. This snippet demonstrates setting interrupt mode, flags, destination, and enabling the IRQ.

```rust
use x2apic::ioapic::{IoApic, IrqFlags, IrqMode, RedirectionTableEntry};

// !!! Map the IOAPIC's MMIO address `addr` here !!!

unsafe {
    let ioapic = IoApic::new(addr);

    ioapic.init(irq_offset);

    let mut entry = RedirectionTableEntry::default();
    entry.set_mode(IrqMode::Fixed);
    entry.set_flags(IrqFlags::LEVEL_TRIGGERED | IrqFlags::LOW_ACTIVE | IrqFlags::MASKED);
    entry.set_dest(dest); // CPU(s) 
    ioapic.set_table_entry(irq_number, entry);

    ioapic.enable_irq(irq_number);
}

```

--------------------------------

### Initialize and Enable Local APIC

Source: https://github.com/kwzhao/x2apic-rs/blob/master/README.md

Initializes and enables the local APIC timer with a default configuration. The timer can be configured further using the builder or directly on the APIC. Ensure the APIC base address is correctly mapped.

```rust
use x2apic::lapic::{LocalApic, LocalApicBuilder, xapic_base};

let apic_physical_address: u64 = unsafe { xapic_base() };
let apic_virtual_address: u64 = <convert from physical address>

let lapic = LocalApicBuilder::new()
    .timer_vector(timer_index)
    .error_vector(error_index)
    .spurious_vector(spurious_index)
    .set_xapic_base(apic_virtual_address)
    .build()
    .unwrap_or_else(|err| panic!("{}", err));

unsafe {
    lapic.enable();
}

```

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