[amp_mcq option1=”TRAP” option2=”SWI” option3=”Same mode” option4=”Different mode” correct=”option2″]
The correct answer is: B. SWI
A software interrupt (SWI) is a type of interrupt that is initiated by software. It is used to call a special routine that can be used to perform tasks such as handling errors, managing interrupts, and accessing protected memory.
SWIs are typically implemented by using a special instruction that causes the processor to jump to a specific address in memory. This address is usually stored in a special register called the SWI vector.
When the processor executes a SWI instruction, it saves the current state of the processor (including the program counter, registers, and flags) and then jumps to the address stored in the SWI vector. The routine at this address can then perform the desired task and then return to the interrupted program.
SWIs are a powerful tool that can be used to implement a variety of features in a computer system. They are often used to implement error handling, interrupt management, and memory protection.
The other options are incorrect because:
- TRAP is a type of hardware interrupt. It is used to signal that an error has occurred.
- Same mode and different mode are not relevant to the question of data protection in the software interrupt mechanism.