Method ioapic_write

devices/src/ioapic.rs:252–296

(&mut self, val: u32)

    }

    fn ioapic_write(&mut self, val: u32) {
        debug!("IOAPIC_W reg 0x{:x}, val 0x{:x}", self.reg_sel, val);

        match self.reg_sel as u8 {
            IOAPIC_REG_VERSION => {
                if val == 0 {
                    // Windows writes zero here (see #1791)
                } else {
                    error!(
                        "IOAPIC: invalid write to version register (0x{:x}): 0x{:x}",
                        self.reg_sel, val
                    );
                }
            }
            IOAPIC_REG_ID => self.id_reg = (val >> 24) & 0xf,
            IOWIN_OFF..=REG_MAX_OFFSET => {
                let (index, is_high_bits) = decode_irq_from_selector(self.reg_sel as u8);
                if index > NUM_IOAPIC_PINS {
                    warn!("IOAPIC index out of range: {index}");
                    return;
                }
                if is_high_bits {
                    self.reg_entries[index] &= 0xffff_ffff;
                    self.reg_entries[index] |= u64::from(val) << 32;
                } else {
                    // Ensure not to override read-only bits:
                    // - Delivery Status (bit 12)
                    // - Remote IRR (bit 14)
                    self.reg_entries[index] &= 0xffff_ffff_0000_5000;
                    self.reg_entries[index] |= u64::from(val) & 0xffff_afff;
                }
                // The entry must be updated through the interrupt source
                // group.
                if let Err(e) = self.update_entry(index, true) {
                    error!("Failed updating IOAPIC entry: {e:?}");
                }
                // Store the information this IRQ is now being used.
                self.used_entries[index] = true;
            }
            _ => error!(
                "IOAPIC: invalid write to register offset 0x{:x}",
                self.reg_sel
            ),
        }
    }

    fn ioapic_read(&self) -> u32 {
        debug!("IOAPIC_R reg 0x{:x}", self.reg_sel);