Description: A service routine is a function that handles a specific type of request from the operating system. These routines are fundamental for the interaction between hardware and software, as they allow the operating system to respond to events and requests efficiently. In the context of operating modes in a system, such as Kernel Mode and User Mode, service routines play a crucial role. In Kernel Mode, service routines have full access to system resources, allowing them to perform critical operations and manage hardware directly. On the other hand, in User Mode, service routines are restricted and can only access a limited set of resources, which helps protect the stability and security of the system. This separation between operating modes is essential to prevent malicious or faulty applications from affecting the overall functioning of the operating system. Service routines are invoked by interrupts, which are signals sent by hardware or software to indicate that immediate attention is required, and their proper implementation is vital for system performance and stability.
