Struct pic8259::ChainedPics

pub struct ChainedPics { /* private fields */ }

A pair of chained PICs. This is the standard setup on x86.

Implementations

impl ChainedPics

pub const unsafe fn new(offset1: u8, offset2: u8) -> ChainedPics

Create a new interface for the standard PIC1 and PIC2, specifying the desired interrupt offsets.

pub const unsafe fn new_contiguous(primary_offset: u8) -> ChainedPics

Create a new ChainedPics interface that will map the PICs contiguously starting at the given interrupt offset.

This is a convenience function that maps the PIC1 and PIC2 to a contiguous set of interrupts. This function is equivalent to Self::new(primary_offset, primary_offset + 8).

pub unsafe fn initialize(&mut self)

Initialize both our PICs. We initialize them together, at the same time, because it’s traditional to do so, and because I/O operations might not be instantaneous on older processors.

pub unsafe fn read_masks(&mut self) -> [u8; 2]

Reads the interrupt masks of both PICs.

pub unsafe fn write_masks(&mut self, mask1: u8, mask2: u8)

Writes the interrupt masks of both PICs.

pub unsafe fn disable(&mut self)

Disables both PICs by masking all interrupts.

pub fn handles_interrupt(&self, interrupt_id: u8) -> bool

Do we handle this interrupt?

pub unsafe fn notify_end_of_interrupt(&mut self, interrupt_id: u8)

Figure out which (if any) PICs in our chain need to know about this interrupt. This is tricky, because all interrupts from pics[1] get chained through pics[0].