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Welcome to FoolOS
=================
Multiboot
---------
The FoolOS Kernel is following the Multiboot Specification (0.6.96)
providing a multiboot header and the entry point _start().
This in turn calls the C function kernel_main().
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 most features are only very rudimentary and mostly buggy.
* Booting with Multiboot (grub)
* 32-bit protected mode
* VESA and EGA-standard text-mode
* Logging to COM1
* Parsing ACPI and Multiboot Data (partly)
* Symmetrical Multiprocessing with LAPIC and IOAPIC
* APIC and PIT Timers
* Seperate GDT and IVT on each CPU
* Paging / Virtual Memory
* RAM image (ext2 read-only)
* VESA Framebuffer with fallback to a text-only terminal
* Standard streams (stdin/stdout/stderr)
* Mouse and Keyboard
* Multithreading & Multitasking
* Kernel and Userspace Tasks (ring 0/ring 3)
* CPU Private Memory
* Superfast Task Scheduler
* Newlib C library for Userspace
* ELF binaries
* IRQ Handling Framework
* Spinlocks
* Simple Shell
* PCI bus scanning
Discontinued Features
---------------------
* Floppy Disk Driver
* Custom Bootloader (2 stages)
Todos
-----
* Mouse & KB processing in seperate task.
* Kernel Stuff Reentrancy & Newlib Reeentrancy Struct
* Unit Tests
* Ethernet driver E1000 / NS2000 & Networking stack (ipxe network drivers?)
* Porting (ncurses, gcc, binutils, vim, apache...)
* Posix getdents
* GCC optimizations (break kernel?)
* Writing to ext2 RAM-image
* Mutes
* Flush TLB
* GUI / Window Manager (update\_rect, etc..)
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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