The Interrupt Vector Table (IVT) is a data structure that associates each interrupt with the corresponding handler. This table resides at a fixed location in memory that the processor checks when an interrupt is raised. Here's a step-by-step explanation:

1. **Definition**: The Interrupt Vector Table is a crucial part of an operating system's low-level code. It's a special area of memory that holds the addresses of Interrupt Service Routines (ISR), which are special pieces of code that are executed in response to a particular interrupt.

2. **Purpose**: The main purpose of the IVT is to provide the system with a way to respond to different events (interrupts). These events can be triggered by both hardware (like pressing a key on the keyboard) and software (like a division by zero).

3. **Structure**: The IVT is an array of memory addresses. Each entry in the table corresponds to a specific interrupt. When an interrupt is triggered, the processor uses the interrupt number as an index into the IVT and jumps to the ISR at that location.

4. **Location**: The location of the IVT in memory is determined by the specific architecture of the system. For example, in x86 systems, the IVT is typically located at the first 1024 bytes of memory.

5. **Usage**: When an interrupt occurs, the CPU stops whatever it's doing and saves its state. It then looks up the interrupt number in the IVT and jumps to the corresponding ISR. Once the ISR has finished executing, the CPU restores its state and continues with whatever it was doing before the interrupt.

6. **Modification**: Modifying the IVT is a sensitive operation that is typically only done by the operating system kernel. This is because incorrect modifications can lead to system instability or crashes.

In conclusion, the Interrupt Vector Table is a fundamental part of how a computer system handles interrupts. It allows the system to respond to different events in a structured and organized manner.

Question

The Interrupt Vector Table (IVT) is a data structure that associates each interrupt with the corresponding handler. This table resides at a fixed location in memory that the processor checks when an interrupt is raised. Here's a step-by-step explanation:

1. **Definition**: The Interrupt Vector Table is a crucial part of an operating system's low-level code. It's a special area of memory that holds the addresses of Interrupt Service Routines (ISR), which are special pieces of code that are executed in response to a particular interrupt.

2. **Purpose**: The main purpose of the IVT is to provide the system with a way to respond to different events (interrupts). These events can be triggered by both hardware (like pressing a key on the keyboard) and software (like a division by zero).

3. **Structure**: The IVT is an array of memory addresses. Each entry in the table corresponds to a specific interrupt. When an interrupt is triggered, the processor uses the interrupt number as an index into the IVT and jumps to the ISR at that location.

4. **Location**: The location of the IVT in memory is determined by the specific architecture of the system. For example, in x86 systems, the IVT is typically located at the first 1024 bytes of memory.

5. **Usage**: When an interrupt occurs, the CPU stops whatever it's doing and saves its state. It then looks up the interrupt number in the IVT and jumps to the corresponding ISR. Once the ISR has finished executing, the CPU restores its state and continues with whatever it was doing before the interrupt.

6. **Modification**: Modifying the IVT is a sensitive operation that is typically only done by the operating system kernel. This is because incorrect modifications can lead to system instability or crashes.

In conclusion, the Interrupt Vector Table is a fundamental part of how a computer system handles interrupts. It allows the system to respond to different events in a structured and organized manner.

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