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https://github.com/jasonbrave/panicos

A simple x86 operating system with graphical user space
https://github.com/jasonbrave/panicos

c-standard-library dynamic-linking elf elf-loader fat32 kernel mbr multiboot operating-system osdev pci pci-express pcie stl usb vfs virtio virtio-gpu widget-toolkit x86

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A simple x86 operating system with graphical user space

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README 

        
# PanicOS

A simple operating system for 32-bits x86 PCs.



![PanicOS](https://user-images.githubusercontent.com/40355221/144753051-f3bd442b-8f74-4bd6-b399-73bd82aa9b40.png)



## Features



### Kernel

* 32-bits x86 support

* Legacy BIOS and UEFI booting with GRUB2

* SMP

* PAE paging (see [pae](https://github.com/JasonBrave/PanicOS/tree/pae) branch)

* ELF file loading

* Loadable kernel modules

* Parallel ATA IDE Controller and Disk driver

* QEMU Bochs display driver

* PCI Bus support

* PCI Express ECAM support

* PCI MSI and MSI-X interrupt support

* PS/2 keyboard and mose driver

* USB Bus support

* USB Hub driver

* UHCI USB controller driver

* VirtIO block device and GPU device driver

* PC platform RTC and UART driver

* Virtual filesystem

* FAT32 filesystem support

* Master Boot Record partition table support

* Hardware abstraction layer abstracts block device, display device and HID device

* Reboot and shutdown



### User Space

* Dynamic linking

* C++ global constructor and destructor

* [C Standard Library](https://github.com/JasonBrave/PanicOS/tree/master/library/libc)

* [C++ Standard Library including STL](https://github.com/JasonBrave/PanicOS/tree/master/library/libcpp)

* [C++ object-oriented GUI widget toolkit](https://github.com/JasonBrave/PanicOS/tree/master/library/libgui)

* POSIX emulation library

* Window manager

* Graphical desktop envoironment

* Various user space programs



## Build Instructions



A build of gcc and binutils with `i686-elf` target triplet is required. `dosfstools` and `mtools` are also required for creating disk image. QEMU with target i686 or x86-64 is required for emulation



Run `make` to create disk image and kernel image, run `make qemu` to start qemu emulation.



## Directory Structure

* `/boot` Disk image boot sector

* `/ext` Utility for building out-of-tree kernel modules

* `/kernel` Operating System Kernel

* `/kernel/arch/x86` x86 architecture specific code

* `/kernel/common` kernel common used code

* `/kernel/core` Kernel core

* `/kernel/drivers` Kernel built-in device drivers

* `/kernel/filesystem` Kernel build-in filesystem drivers

* `/kernel/hal` Kernel hardware abstraction layer

* `/kernel/proc` Kernel process management

* `/library` User space libraries

* `/library/crt` C Runtime (crt0 and crt1)

* `/library/ld` Dynamic linker

* `/library/libc` C Standard Library

* `/library/libcpp` C++ Standard Library

* `/library/libcpu` CPU abstraction library

* `/library/libgui` C++ GUI widget toolkit library

* `/library/libposix` POSIX emulation library

* `/library/libsys` System call library

* `/library/libwm` Window manager library

* `/module/edu` QEMU EDU device driver

* `/module/hello` Hello World kernel module example

* `/module/modlib` Kernel module support library

* `/module/virtgpu` VirtIO GPU driver

* `/programs/about` Graphical About program

* `/programs/cat` A program to display context of a text file

* `/programs/date` A command line utility to display date and time

* `/programs/desktop` Graphical desktop environment

* `/programs/devmgr` Device manager

* `/programs/dir` A program to list files in a directory

* `/programs/init` Init program

* `/programs/kmod` A tool to load kernel modules

* `/programs/lscpu` An utility to display CPU infomation

* `/programs/lspci` An utility to list PCI (Express) devices

* `/programs/mkdir` A program for creating directories

* `/programs/reboot` A program to reboot computer

* `/programs/rm` A program to delete files

* `/programs/sh` Shell

* `/programs/shutdown` A program to shut down computer

* `/programs/termemu` Graphical terminal emulator

* `/programs/wm` Graphical window manager

* `/share` Non-code data

* `/tools` Tools used in the compiling process