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Operating Systems | Input Output Systems | Question 4

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Normally user programs are prevented from handling I/O directly by I/O instructions in them. For CPUs having explicit I/O instructions, such I/O protection is ensured by having the I/O instructions privileged. In a CPU with memory mapped I/O, there is no explicit I/O instruction. Which one of the following is true for a CPU with memory mapped I/O? (GATE CS 2005) (A) I/O protection is ensured by operating system routine(s) (B) I/O protection is ensured by a hardware trap (C) I/O protection is ensured during system configuration (D) I/O protection is not possible

Answer: (A)

Explanation: See question 1 of https://www.geeksforgeeks.org/operating-systems-set-16/

Last Updated : 14 Feb, 2013
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