x86_64 Operating System - Course Project - CSE 506 - SBU
Operating System implementation as a course project for CSE 506 under Prof. Mike Ferdman. It has Cooperative multi-tasking with below functionalities :
1) All functions from include/*.h must work
2) Virtual memory/ring-3 user processes
3) COW fork(), auto-growing stack, graceful SEGV
4) tarfs: open, read, close, opendir, readdir, closedir
5) read(stdin), write(stdout), write(stderr)
6) Binaries: echo, sleep, cat, ls, kill -9, ps
7) Command prompt - sbush
1) Memory Subsystem (page descriptors, free list, page tables, kmalloc)
2) rocess Subsystem (kernel threads, context switch)
3) User-level Subsystem (VMAs/vm_map_entrys, switch to ring 3, page faults)
4) I/O subsystem (syscalls, terminals, VFS, tarfs file access)
5) Implement /bin/init (call fork()+exec()+wait() on /etc/rc, then exec() sbush)
1) builds a kernel
2) copies it into rootfs/boot/kernel/kernel
3) creates an ISO CD image with the rootfs/ contents
qemu-system-x86_64 -curses -drive id=boot,format=raw,file=$USER.img,if=none -drive id=data,format=raw,file=$USER-data.img,if=none -device ahci,id=ahci -device ide-drive,drive=boot,bus=ahci.0 -device ide-drive,drive=data,bus=ahci.1 -gdb tcp::9999
Explanation of parameters:
-curses use a text console (omit this to use default SDL/VNC console)
-drive … connect a CD-ROM or hard drive with corresponding image
-device … configure an AHCI controller for the boot and data disks
-gdb tcp::9999 listen for “remote” debugging connections on port NNNN
-S wait for GDB to connect at startup
-no-reboot prevent reboot when OS crashes
When using the -curses mode, switch to the qemu> console with ESC-2.
gdb ./kernel
At the (gdb) prompt, connect with:
target remote localhost:9999
Browseable modern OS source codes
How statically linked
programs run on linux
Fixing GDB on local machine - Raveendra Soori
We do not provide support for it, but you can get your own usable environment for the course projects up and running by installing Ubuntu 16.04 and:
apt-get install build-essential gdb git screen tmux emacs exuberant-ctags ccache eclipse xterm gtkwave tcl-dev zsh strace curl mkisofs qemu dosfstools syslinux
If you are working on your own machine, you will need to build gdb from source and apply a patch.