$1.$ Create and explore your own directory containing the RISC$-$V version of xv$6$ source code.

GitHub $-$ mit$-$pdos$/$xv$6-$riscv: Xv$6$ for RISC$-$VLinks to an external site.

$2.$ Invent, code, and demonstrate a C program that uses UNIX system calls to $$ping$-$pong$$ a byte between two processes over a pair of pipes, one for each direction. Measure $($e$.$g$.,$ using the "Codetimer" tool$)$ the program$$s performance, in exchanges per second.

$3.$ Add a system call to xv$6$ that returns the amount of free memory available.