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Computer Science Engineering (CSE) Exam  >  Computer Science Engineering (CSE) Questions  >  The instructions which can be run only superv... Start Learning for Free
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The instructions which can be run only supervisor mode are
  • a)
    Non-privileged instructions
  • b)
    System instructions
  • c)
    Privileged instructions
  • d)
    Exception instructions
Correct answer is option 'C'. Can you explain this answer?
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The instructions which can be run only supervisor mode area)Non-privil...
Answer: c
Explanation: These instructions are those which can are crucial for the systems performance and hence cannot be adultered by user programs, so is run only in supervisor mode.
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The instructions which can be run only supervisor mode area)Non-privil...

Privileged Instructions Explanation:

Privileged instructions are a type of instruction that can only be executed in supervisor mode, also known as kernel mode, which is a restricted mode of operation in a computer system. These instructions are designed to perform tasks that require a higher level of privilege and control over the system.

Characteristics of Privileged Instructions:
- Privileged instructions are typically used for critical system operations such as accessing hardware devices, managing memory, and controlling system resources.
- They are restricted to only be executed by the operating system kernel or other trusted system software, preventing regular user programs from accessing or modifying sensitive system resources.
- These instructions are essential for maintaining the security and stability of the system by preventing unauthorized access to critical system functions.

Examples of Privileged Instructions:
- Instructions that enable or disable interrupts.
- Instructions that switch the processor to supervisor mode.
- Instructions that perform input/output operations to hardware devices.
- Instructions that manipulate memory protection settings.

In conclusion, privileged instructions are a crucial component of operating systems as they help ensure the proper functioning and security of the system by restricting certain operations to supervisor mode. These instructions play a key role in maintaining the integrity and stability of the system.
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An instruction pipeline has five stages where each stage take 2 nanoseconds and all instruction use all five stages. Branch instructions are not overlapped. i.e., the instruction after the branch is not fetched till the branch instruction is completed. Under ideal conditions,a. Calculate the average instruction execution time assuming that 20% of all instructions executed are branch instruction. Ignore the fact that some branch instructions may be conditional.b. If a branch instruction is a conditional branch instruction, the branch need not be taken. If the branch is not taken, the following instructions can be overlapped. When 80% of all branch instructions are conditional branch instructions, and 50% of the conditional branch instructions are such that the branch is taken, calculate the average instruction execution time. Correct answer is 'Each stage is 2 ns.'. Can you explain this answer?

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The instructions which can be run only supervisor mode area)Non-privileged instructionsb)System instructionsc)Privileged instructionsd)Exception instructionsCorrect answer is option 'C'. Can you explain this answer?
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