Welcome to FoolOS
=================

Disclaimer
----------

THIS IS A WORK IN PROGRESS.

This is a simple and useless "operating system", with very basic 
features, sorry. It is the fruit of my fundamental explorations of 
the x86 architectures,  32-bit protected mode, interrupt handling, 
memory management, scheduling the floppy disk controller, networking 
as well as VESA and a couple of other things.

![Screenshot of FoolOS](/screenshots/foolos.png?raw=true "FoolOs Kernel")

Copyright M.Idziorek 2014 <m.i@gmx.at> unless stated otherwise!

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

Usage
-----

Attach the FoolOS.img floppy image in your favourite emulator and boot
or create a bootable USB stick by copying the raw data in the following way

$ cat ./FloppyOS.img > /dev/sdX


Supported Platforms
-------------------

FoolOS is tested/developed on the following emulators/machines

* bochs 2.6.6 (compiled with: ./configure --enable-clgd54xx --enable-a20-pin --enable-debugger --enable-disasm --enable-e1000 --with-x --with-x11 --enable-smp)
* qemu 1.1.2
* virtual box 4.1.18
* Acer Aspire 1810TZ (Notebook)
* Q6600 on Asus p5n32-e sli plus (Desktop PC)

Features
--------

Please note that all features are only very rudimentary and buggy.

* Bootloader (2 stages)
* PIT support / Timing
* PIC support & Interrupt handling framework
* PCI bus scanning
* Physical memory management
* Virtual memory management
* Multitasking
* Symmetric Multiprocessing
* ACPI / MP
* Floppy disk driver
* PS2 Mouse driver
* Keyboard driver (redesign!)
* VESA 
* Spinlocks

Todos
-----

* set up os-specific toolchain
* set dependancies in the makefile!
* Port newlib and gcc
* Shell
* E1000 driver
* Networking stack 
* Web-server
* User space
* window manager

* 64-bit
* ARM
* JVM
* USB driver
* Ext2 driver
* Higher half kernel

Issues
------

* Assumed support for VESA mode 0x114 with linear addressing.
* Control of stack heap growth.

Organization
------------

* asm/
* bochs/ 
* boot/ 
* boot0/
* data/
* kernel/
* lib/
* release/
* screenshots/
* tools/


REFERENCES
==========

* http://www.brokenthorn.com/Resources/OSDev17.html
* http://www.jamesmolloy.co.uk/tutorial_html/9.-Multitasking.html
* http://pdos.csail.mit.edu/6.828/2011/labs/lab6/
* http://pdos.csail.mit.edu/6.828/2011/xv6.html
* http://www.nongnu.org/ext2-doc/
* http://www.osdever.net/tutorials/view/multiprocessing-support-for-hobby-oses-explained
* http://forum.osdev.org/viewtopic.php?f=1&t=10944
* http://wiki.osdev.org/Virtual_8086_Mode
* http://wiki.xomb.org/index.php?title=ACPI_Tables