Interrupt Descriptor Table (IDT)
Learn about the Interrupt Descriptor Table (IDT), its structure, and how the operating system uses it to dispatch interrupt handlers.
The IDT: An Interrupt Map
Imagine the CPU gets a signal that something important happened – like you pressing a key or a program crashing. How does it know what code to run to handle that event? That's where the Interrupt Descriptor Table (IDT) comes in!
It's like a special phone book for your CPU. Each entry in this 'phone book' tells the CPU exactly where to go to find the right code (an 'interrupt handler') for a specific event.
Why the CPU Needs the IDT
Without the IDT, the CPU wouldn't know how to react to different events. It provides a structured way for the processor to dispatch control to the appropriate routine when an interrupt or exception occurs.
This allows the operating system to respond to hardware signals, software requests, and errors in a controlled and organized manner, ensuring system stability.
All lessons in this course
- Understanding Interrupts and Traps
- Interrupt Descriptor Table (IDT)
- Custom Exception Handlers
- The Programmable Interrupt Controller (PIC) and APIC