A tiny OS that used for course OSDI in National Chiao Tung University, Computer Science Dept.
This OS only supports x86
In this lab, you will learn about process management, basic scheduling and system calls.
In our design, each process contains a page directory so that each of them can have full memory addressing space.
For each process, there are several attributes that are necessary for kernel to manage the process easily, you can reference kernel/task.h
for more detail.
Source Tree
kernel/*
: Includes all the file implementation needed by kernel only.
lib/*
: Includes libraries that should be in user space.
inc/*
: Header files for user.
user/*
: Files for user program.
boot/*
: Files for booting the kernel.
You can leverage grep
to find out where to fill up to finish this lab.
$ grep -R TODO .
To run this kernel
$ make
$ make qemu
To debug
$ make debug
Modifications to be made
lib/syscall.c
implement the interfaces of system calls for user program to use.kernel/task.h
to open interfaces of implementation of system calls forkernel/syscall.c
kernel/task.c
implementtask_create
,task_free
,sys_kill
,sys_fork
, andtask_init
kernel/syscall.c
implement system callskernel/trap_entry.S
implement trap handler interface for system callkernel/mem.c
implementsetupkvm
used by each process creationkernel/sched.c
implement schedulerkernel/timer.c
implement timer_handler to support sleep
In this lab, you will learn about memory management in x86.
You can leverage grep
to find out where to fill up to finish this lab.
$ grep -R TODO .
To run this kernel
$ make
$ qemu -hda kernel.img -monitor stdio
- Modify
kernel/mem.c
to implement the memory management functions - Modify
kernel/trap.c
andkernel/trap_entry.S
to setup IDT for pagefault
In this lab, you will learn about interrupt and segmentation mechanism in x86.
We provided you with keyboard handler, timer handler, and simple VGA driver.
You can leverage grep
to find out where to fill up to finish this lab.
$ grep -R TODO .
To run this kernel
$ make
$ qemu -hda kernel.img -monitor stdio
- Modify
boot/boot.S
to setup GDT - Modify
kernel/trap.c
andkernel/trap_entry.S
to setup IDT for keyboard and timer - Modify
kernel/main.c
to uncomment the setup process - Modify
kernel/shell.c
to supportkerninfo
andchgcolor
After this lab, you should know about how interrupt works and the working flow of GDT & IDT
This is forked and modified from MIT's Xv6