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Virtual to Physical address translations in xv6 (Deadline: 19 Nov 2021 at 23:59 hrs)

  • NOTE: The assignment is same the Exercise 2 given at: https://moss.cs.iit.edu/cs450/assign02-xv6-syscall.html

  • In this assignment, you have to add a new system call named v2paddr. The v2paddr() system call should take a virtual address in the address space of the process calling the system call as an argument, and should return the corresponding physical address. If the virtual address passed is invalid (inside the calling processes’ address space), then it has to return -1. You may also want to look at the Hints section of Exercise 2 given in the link for help on getting started with the assignment. You may want to make the xv6 kernel print suitable messages on to the console so that you can verify the correctness of your implementation.

  • You have to create a user or application program named test_v2paddr.c that will call your newly created v2paddr() system call, edit the makefile appropriately to compile test_v2paddr.c and insert it into the filesystem of xv6 appropriately.

  • To evaluate the submission, the instructor will do the following:

    pull your changes 
run the command make qemu-nox 
In the command prompt of (booted) xv6, type test_v2paddr
For grading purposes, the instructor will replace your test_v2paddr.c with different programs.