Supervisor Call instruction
A supervisor call is a special instruction that a computer program can use to access features of the computer that are only available to privileged programs. It's like a secret code that only special programs are allowed to use.
When a computer program needs to do something that requires special permissions, like accessing certain parts of the computer's memory or changing how other programs run, it can use a supervisor call instruction to ask for permission. If the program has the right privileges, the instruction is executed and the program can do what it needs to do. If the program doesn't have the right privileges, the instruction won't be executed and the program won't be able to do what it needs to do.
Supervisor call is an important security feature in computers because it helps prevent malware or other malicious software from accessing sensitive parts of the computer. It also helps ensure that only trusted and authorized programs can perform certain functions.
When a computer program needs to do something that requires special permissions, like accessing certain parts of the computer's memory or changing how other programs run, it can use a supervisor call instruction to ask for permission. If the program has the right privileges, the instruction is executed and the program can do what it needs to do. If the program doesn't have the right privileges, the instruction won't be executed and the program won't be able to do what it needs to do.
Supervisor call is an important security feature in computers because it helps prevent malware or other malicious software from accessing sensitive parts of the computer. It also helps ensure that only trusted and authorized programs can perform certain functions.