Question: In this homework mini-project your team will add a simple system call to xv6. Your new syscall should look like this: int howmanysys(void) Your system

In this homework mini-project your team will add a simple system call to xv6. Your new syscall should look like this: int howmanysys(void) Your system call returns the number of system calls that have taken place so far.

Hint

You can start by taking a look and using another system call, like getpid() to get an idea of how the code works . Most of the time will be spent on understanding the code. There shouldn't be a whole lot of code added you can use any editor and gcc as a compiler.

Check this Lab tutorial for C programming in three easy pieces website: http://pages.cs.wisc.edu/~remzi/OSTEP/lab-tutorial.pdf

Details

Setting up the environment.

-Download XV6

-Unzip the file

-tar xzf XV6.tar.gz

-Compile the system

-Make

-Modify file Makefile line 56

-QEMU:=qemu-system-i386

-Run qemu

-Make qemu-nox

More instructions about the homework and details about the different components of xv6

https://www.youtube.com/watchv=lyuNbuymGD8&feature=youtu.be

Excellent video (Prof Remzi Arpaci-Dusseau Author of three easy pieces)

start watching at minute 37:57

this are the files you will have to modify

syscall.h

syscall.c

user.h

usys.S

sysproc.c

Makefile

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