Module pic 

8259 Programmable Interrupt Controller (PIC): remaps hardware IRQ vectors and signals end-of-interrupt.

Authors: MarioS271

Constants

PIC_MASTER_CMD_PORT

I/O port for sending commands (including ISR read) to the master PIC.

PIC_MASTER_OFFSET

Vector offset for master-PIC IRQs after remapping; IRQ n fires at PIC_MASTER_OFFSET + n.

PIC_SLAVE_OFFSET

Vector offset for slave-PIC IRQs after remapping; IRQ n fires at PIC_SLAVE_OFFSET + (n - 8).

Statics

CHAINED_PICS 🔒

The chained master+slave PIC pair, lockable from IRQ handlers.

Functions

end_of_interrupt

Send an End-of-Interrupt (EOI) for the vector that fired; every hardware IRQ handler must call this before returning or that IRQ line stays blocked.

init

Initialize and remap the PIC, then enable only IRQ0 (PIT timer).