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Welcome to FoolOS
=================
Disclaimer
----------
THIS IS A WORK IN PROGRESS.
This is a simple and useless "operating system", with a very basic set
of features. It is the fruit of my fundamental explorations of the x86
architecture and operating system design.
Copyright M.Idziorek 2014-2015,2018 <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.
Prequisites
-----------
GCC CROSS-COMPILER (i686-elf)
https://wiki.osdev.org/GCC_Cross-Compiler (18 AUG 2018)
ftp://ftp.fu-berlin.de/unix/languages/gcc/releases/gcc-8.2.0/gcc-8.2.0.tar.gz
https://sunsite.icm.edu.pl/pub/gnu/binutils/binutils-2.31.1.tar.gz
NEWLIB
https://wiki.osdev.org/Porting_Newlib (18 AUG 2018)
ftp://sourceware.org/pub/newlib/newlib-3.0.0.20180802.tar.gz
https://ftp.gnu.org/gnu/autoconf/autoconf-2.68.tar.gz
https://ftp.gnu.org/gnu/automake/automake-1.11.6.tar.gz
Usage
-----
Use the FoolOS.iso in your favourite emulator or `dd` to an usb stick
and test on real hardware.
Supported Platforms
-------------------
TODO: update/recheck
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 --with-term --enable-smp) (add -lpthread to LIBS in the Makefile!)
* bochs 2.6.8 (compiled with: ./configure --enable-clgd54xx --enable-a20-pin --enable-debugger --enable-disasm --enable-e1000 --with-x --with-x11 --with-term --enable-smp) (add -lpthread to LIBS in the Makefile!)
* qemu 1.1.2
* virtual box 4.1.18
* Acer Aspire 1810TZ (Notebook)
* Q6600 on Asus p5n32-e sli plus (Desktop PC)
* 4790K on Asus (Desktop PC)
Features
--------
Please note that all features are only very rudimentary and mostly buggy.
* Booting with Multiboot (grub)
* 32-bit protected mode
* Interrupt handling
* Task scheduling
* ELF binaries
* PIT support / Timing
* PIC support & Interrupt handling framework
* Physical memory management
* Virtual memory management
* Multitasking
* Keyboard driver
* Spinlocks
* Simple Shell
* Simple Ext2 driver (read-only)
* PS2 Mouse driver
* ACPI / MP
* Symmetric Multiprocessing
* PCI bus scanning
* Kernel and Userspace Tasks (ring 0/ring 3)
Discontinued Features
---------------------
* Floppy Disk Driver
* Custom Bootloader (2 stages)
Todos
-----
* Check 16bit stack alignment before ALL calls from assembler!
* Ethernet driver E1000 / NS2000 & Networking stack
* Porting (ncurses, gcc, binutils, vim, apache...)
* Check VESA mode and adapt console (text/gui)
* sbrk()
* ESP collisions / TSS-ESP0
* kbfree() and real pgdirectory alloc
* implement posix(?) getdents instead of our own readdir.
* Turning on some gcc optimizations breaks the kernel?
* Writing to files (at least in ext2 ram image)
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
http://wiki.osdev.org/Hosted_GCC_Cross-Compiler
https://sourceware.org/newlib/
and many many more...
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