Module ioapic 

I/O APIC driver

The I/O APIC handles routing of external hardware interrupts to Local APICs. It uses indirect MMIO: write register index to IOREGSEL, then read/write IOWIN.

Constants

IOAPICID 🔒

IOAPICVER 🔒

IOREDTBL_BASE 🔒

IOREGSEL 🔒

IOWIN 🔒

REDIR_ACTIVE_LOW 🔒

REDIR_LEVEL_TRIGGER 🔒

REDIR_MASK 🔒

Statics

IOAPIC_BASE_VIRT 🔒

Virtual base address of the I/O APIC MMIO registers

IOAPIC_GSI_BASE 🔒

GSI base for this I/O APIC

IOAPIC_INITIALIZED 🔒

Whether the I/O APIC has been initialized

MADT_OVERRIDES 🔒

MADT interrupt-source overrides, stored so PCI NIC drivers can route their IRQ correctly after the APIC init phase.

Functions

find_override 🔒

Find the override for a legacy IRQ, returning (gsi, polarity, trigger).

init

Initialize the I/O APIC.

ioapic_read 🔒 ^⚠

Read an I/O APIC register (indirect access)

ioapic_write 🔒 ^⚠

Write an I/O APIC register (indirect access)

mask_irq

Mask a GSI (disable the interrupt)

mask_legacy_irq

Mask a legacy IRQ, resolving MADT overrides to the correct GSI.

read_redir 🔒 ^⚠

Read a 64-bit redirection entry

route_irq

Route a GSI to a specific LAPIC and vector.

route_legacy_irq

Route a legacy ISA IRQ, applying MADT interrupt source overrides.

route_nic_irq

Route a PCI NIC interrupt through the I/O APIC using stored MADT overrides.

store_madt_overrides

Store the MADT interrupt-source overrides for later use by PCI NIC drivers.

unmask_irq

Unmask a GSI (enable the interrupt)

write_redir 🔒 ^⚠

Write a 64-bit redirection entry