Module pic 

8259 Programmable Interrupt Controller (PIC) driver Inspired by MaestroOS pic.rs

The PIC handles hardware interrupts (IRQs) and maps them to CPU interrupt vectors. We remap IRQs to vectors 0x20-0x2F.

Constants

COMMAND_EOI 🔒

End-of-interrupt command

ICW1_ICW4 🔒

ICW1_INIT 🔒

ICW1: Initialization + ICW4 needed

ICW3_CASCADE 🔒

ICW3: Cascade identity for slave

ICW3_SLAVE_PIC 🔒

ICW3: Slave PIC on IRQ2

ICW4_8086 🔒

ICW4: 8086 mode

MASTER_COMMAND 🔒

Master PIC command port

MASTER_DATA 🔒

Master PIC data port

PIC1_OFFSET

IRQ offset for master PIC (IRQ0 -> interrupt 0x20)

PIC2_OFFSET

IRQ offset for slave PIC (IRQ8 -> interrupt 0x28)

SLAVE_COMMAND 🔒

Slave PIC command port

SLAVE_DATA 🔒

Slave PIC data port

Functions

disable

Disable all IRQs on both PICs.

disable_irq

Disable a specific IRQ line.

disable_permanently

Disable the 8259 PIC permanently by masking all IRQs.

enable_irq

Enable a specific IRQ line.

end_of_interrupt

Send End-Of-Interrupt to the PIC for the given IRQ.

init

Initialize the PIC with the given offsets.