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Operating Systems | Input Output Systems | Question 4
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
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