"Interrupts"或"Interrupt Vector Table"简称
时间: 2024-07-07 13:01:11 浏览: 62
Interrupts, also known as interrupts or interupts, are a fundamental concept in computer architecture and operating systems. Interrupts are a mechanism by which the normal flow of program execution is temporarily paused to handle a specific event or request from an external device or an internal processor component.
When an interrupt occurs, the CPU saves its current state (including registers and the instruction pointer), and jumps to a predetermined location in memory, called the Interrupt Vector Table (IVT) or Interrupt Service Routine (ISR). The IVT contains the addresses of the routines that handle the different types of interrupts, allowing the system to quickly identify the appropriate response.
Here's a brief overview of the key points:
1. **Interrupt Request**: An event, such as a timer expiration or a hardware error, triggers an interrupt.
2. **Interrupt Vector Table**: A fixed location in memory where the CPU looks up the address of the corresponding interrupt service routine (ISR).
3. **Interrupt Handler**: The ISR is executed, which may perform tasks like updating system状态, checking for errors, or communicating with external devices.
4. **Clearing Interrupt**: After handling the interrupt, the CPU resets the interrupt flag, allowing the system to resume normal operation.