A toy operating system based on Brans' Kernel Development Tutorial
Current goals of this project is to build operating system with minimal support for the following:

1. Memory manager(from virtual page allocation to kmalloc) [Done]
2. File system(Hard disk driver, Support ext2, and virtual filesystem) [Done]
3. Graphical User Interface
4. Premptive multitasking
5. Network(TCP, UDP, HTTP)
6. User apps(File browser, downloader, editor and etc)

Simpleos use elf-i686-gcc as cross-compiler, please build the cross compiler on your system first.

How to build a cross compiler
Or, a rewritten/translated version of the above wiki article in Simplified Chinese

Link: 环境搭建与交叉编译器 Download password: 7ksb

Then, install nasm

sudo apt-get install nasm

Run the following script to generate 4 hard disk image

./mkext2image.sh

Run the following script to setup the tap network device

./setup_tap_device.sh

Note: The path of executable qemu-bridge-helper may vary, and so you should manually replace this path in qemu_run.sh, kvm.sh and debug_qemu.sh first. Use this command to find the path of qemu-bridge-helper

cd ~
find . -iname qemu-bridge-helper

If you would like to run the os in GUI mode, set the constant GUI_MODE (defined in kmain.c) to 1. If you would like to run the os in Network mode, set the constant NETWORK_MODE (defined in kmain.c) to 1.

Now run the following script to compile the kernel

./compile.sh

And then choose one of the following simulator to boot simpleos. QEMU is more recommended.

1. Run sudo apt-get install qemu-system
2. Run ./qemu_run.sh to boot simpleos(or ./kvm.sh if your environment supports kvm)

1. run ./debug_qemu.sh

       0 Higher half loader [✔]
       1 physical memory management [✔]
       2 paging(virtual memory management) [✔]
       3 kmalloc [✔]

       0 PCI Enumerate,R/W [✔]
       1 ATA/DMA Driver [✔]
       2 Ext2 Filesystem [✔]
       3 Virtual Filesystem [✔]

       0 vesa driver, 1024 * 768 color(32-bit color)，framebuffer mode [✔]
       1 Milestone(try loading and showing a wallpaper from hardisk!) [✔]
       2 Windows compositor, support fonts, buttons,and etc [✔]
       3 Write a shell []
       4 Write a file browser []

       1 Usermode [✔]
       1 Multi-tasking/Simple scheduler []
       2 Executable loader(elf) [✔]
       3 spinlock, mutex, and other pthread primitives []
       4 Add more syscalls, like fork/exec, open, read, etc.. []
       5 Port newlib []
       6 Write or port some baisc utilities such asenv, rm, cp, mkdir, reboot []
       7 Real time clock [✔]
       9 stadard input/output stuff []

       0 Send/Recv raw packets [✔]
       1 IP [✔]
       2 UDP [✔]
       3 ARP [✔]
       4 DHCP [✔]
       5 TCP []
       6 HTTP []