59 lines
1.5 KiB
Rust
59 lines
1.5 KiB
Rust
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use crate::error::Error;
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use crate::devices::TransmutableBox;
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pub struct InterruptController {
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target: Option<TransmutableBox>,
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interrupts: Vec<(bool, u8)>,
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highest: u8,
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}
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impl Default for InterruptController {
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fn default() -> InterruptController {
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InterruptController {
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target: None,
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interrupts: vec![(false, 0); 7],
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highest: 0,
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}
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}
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}
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impl InterruptController {
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pub fn set_target(&mut self, dev: TransmutableBox) -> Result<(), Error> {
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if self.target.is_some() {
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return Err(Error::new("Interruptable device already set, and interrupt controller only supports one receiver"));
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}
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self.target = Some(dev);
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Ok(())
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}
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pub fn set(&mut self, state: bool, priority: u8, number: u8) -> Result<(), Error> {
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self.interrupts[priority as usize].0 = state;
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self.interrupts[priority as usize].1 = number;
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if state && priority > self.highest {
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self.highest = priority;
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}
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Ok(())
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}
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pub fn check(&mut self) -> (bool, u8) {
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if self.highest > 0 {
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(true, self.highest)
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} else {
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(false, 0)
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}
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}
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pub fn acknowledge(&mut self, priority: u8) -> Result<u8, Error> {
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let acknowledge = self.interrupts[priority as usize].1;
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self.interrupts[priority as usize].0 = false;
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while self.highest > 0 && !self.interrupts[self.highest as usize].0 {
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self.highest -= 1;
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}
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Ok(acknowledge)
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}
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}
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