23 votes 23 votes Under paged memory management scheme, simple lock and key memory protection arrangement may still be required if the _________ processors do not have address mapping hardware. Operating System gate1990 operating-system virtual-memory fill-in-the-blanks + – makhdoom ghaya asked Nov 18, 2016 edited Apr 16, 2021 by Lakshman Bhaiya makhdoom ghaya 5.7k views answer comment Share Follow See all 3 Comments See all 3 3 Comments reply Mukti commented Oct 15, 2017 reply Follow Share could you suggest any book or any kind of resources to study topic related to this ques in a bit detail? 2 votes 2 votes Anshul Shankar commented Oct 30, 2017 reply Follow Share @arjun Sir @bikram Sir Any explanation in support of this answer?? 2 votes 2 votes RasMalai commented Aug 1, 2020 reply Follow Share This question needs a properly worded answer. 1 votes 1 votes Please log in or register to add a comment.
15 votes 15 votes i/o processors because processor will issue address for device controller and if there is no translation hardware then it ain't gonna be peachy. ashish gusai answered Jan 9, 2017 edited Dec 2, 2018 by kenzou ashish gusai comment Share Follow See all 10 Comments See all 10 10 Comments reply Tuhin Dutta commented Sep 17, 2017 reply Follow Share Can you elaborate it more? Can't understand. What is meant by simple lock and key memory protection arrangement ? Is it bcz if I/O processors do not have address translation h/w it might try to access OS part and corrupt it? 2 votes 2 votes bhuv commented Sep 26, 2017 reply Follow Share More Information needed. 0 votes 0 votes Mukti commented Oct 15, 2017 reply Follow Share could you suggest any book or any kind of resources to study topic related to this ques in a bit detail? 1 votes 1 votes set2018 commented Nov 1, 2017 reply Follow Share simple lock and key memory protection arrangement whts the relationship between these two? 1 votes 1 votes krish__ commented Nov 10, 2017 reply Follow Share I presume that in the absence of address mapping hardware for the I/O processors, (Memory Mapped I/O) 2 processes writing to the same page concurrently require a lock based protection scheme since paging alone cannot prevent the overwriting from happening. 22 votes 22 votes zeeshanmohnavi commented Dec 10, 2018 reply Follow Share Why is the emphasis given to I/O processors only? I think an absence of address mapping hardware requires lock-and-key memory protection mechanism even for a general-purpose processor. 0 votes 0 votes srestha commented Sep 28, 2019 i edited by srestha Sep 29, 2019 reply Follow Share is it require memory mapped i/o or i/o mapped i/o? 1 votes 1 votes rohith1001 commented Jan 17, 2020 reply Follow Share I/O mapped I/O - Addresses which are used to represent memory location can also be used to represent I/O. In this mapping, CPU has to issue a seperate signal to show if it wants to access I/O or memory location. Memory mapped I/O - Addresses used to represent memory location and I/O device are different. So, I think we can have any of the above. I have given my explanation below let me know if anything is wrong. :) @srestha Assume a peripheral device(say PD1) wants to write to memory. Since IOP does not have address mapping hardware, CPU does all the work and gives the memory address to IOP. Now, IOP needs to ensure mutual exclusion among the IO devices PD1, PD2 PD3 etc while accessing the memory location. Hence we will need simple lock and key memory protection. Reference: https://www.studytonight.com/computer-architecture/input-output-processor PS: This is my request. Someone please edit the answer. India is not a native English speaking country and I think it is better to use Indian English in all the answers (or English used in textbooks and not vernacular English). I had to search for the meaning of "peachy" as I did not know. :( "then it ain't gonna be peachy" means "then it is not going to be fine" 11 votes 11 votes Harpuneet Kalsi commented Jul 1, 2021 reply Follow Share even if i/o processors have address mapping hardware , don’t they still require some synchronization techniques ?? 0 votes 0 votes ajayraho commented Jan 21 reply Follow Share best answer 🏆 0 votes 0 votes Please log in or register to add a comment.