Gate CS-2005 Question Paper With Solutions

Q. 20 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 instruction 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?

(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:

Gate CS-2005 Question Paper With Solutions

Learn More:   Gate EC-2009 Question Paper With Solutions

LEAVE A REPLY

Please enter your comment!
Please enter your name here