A simple operating system for 32-bits x86 PCs.

• 32-bits x86 support
• Legacy BIOS and UEFI booting with GRUB2
• SMP
• PAE paging (see 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

• Dynamic linking
• C++ global constructor and destructor
• C Standard Library
• C++ Standard Library including STL
• C++ object-oriented GUI widget toolkit
• POSIX emulation library
• Window manager
• Graphical desktop envoironment
• Various user space programs

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.

• /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