Redirection Table Entry
From Wikipedia, the free encyclopedia
Contents |
[edit] Context
An IOAPIC is a piece of hardware that receives interrupt signals from devices on a bus and redirects these interrupts as messages to a CPU.
Devices on the bus are known as I/O devices, hence the term IOAPIC. The APIC component in a CPU is known as a LAPIC, or Local APIC.
[edit] Redirection Table
The redirection table in an IOAPIC contains information about how to forward interrupts from each interrupt signal line on the IOAPIC. The redirection table is programmable.
[edit] Redirection Table Entry
Each entry contains the following information for each interrupt signal line:
- Whether the line is masked (enabled)
- Whether the line should be edge or level triggered
- Signal polarity for level interrupts: active when low or active when high
- Which CPU(s) the interrupt should be routed to
- How the target CPU(s) should deliver the interrupt to software, including
- Which legacy interrupt vector the target CPU(s) should route the interrupt to (effectively controls priority)
[edit] See also
 |
This computer-related article is a stub. You can help Wikipedia by expanding it. |
