Abstraction is provided by standard system drivers (class or port drivers) No network support in the kernel itself. Relatively stable kernel ABI Kernel design is almost identical to DEC RSX-11 and VMS, with DOS, OS/2 and Windows 95 influences RSX-11, VMS and Windows NT were designed by the same engineer (Dave Cutler) Windows NT was initially developed as a new kernel for OS/2 No device abstraction in the kernel itself. The kernel has backdoors to let the X server talk directly to the hardware, to keep the complexity of video drivers outside of the sensitive environment of kernel modeĩ Linux architecture Applications X server Application libraries libc System calls Signals Direct I/O System Call Interface VFS PM MM Network stack Kernel User mode Kernel mode Arch Device drivers Disk CPU MMU Devices Video card Virtual Physicalġ0 Windows (NT) architecture Monolithic kernel. Filesystem abstraction (VFS) UNIX API (libc) on top of a small UNIX-like system call and signals interface Other APIs (audio, application setup, desktop environment integration, cryptography, etc.) are de facto standards from third parties The graphic subsystem (X server) is in a category of its own. No kernel ABI UNIX process management and security model Native networking support Sockets, pipes select, poll, etc. from Milano Senior ReactOS developer (since 2001)Ĥ What does Windows mean WINDOWS ARCHITECTUREĥ ReactOS is Windows ReactOS has the same identical architecture as Windows, for maximum compatibility Windows drivers require a Windows kernel Many applications (firewalls, antivirus, media players, PDA sync software, etc.) come with special drivers Windows architecture is quite different from Linux and not as well known Let s start from the basicsĦ Operating system architecture Abstraction of CPU time and context (processes, threads, signals, etc.) Abstraction of memory (virtual memory, paging, stacks, heaps, etc.) Separation between system and applications through CPU s built-in memory protection (user mode vs kernel mode) Separation between hardware and applications through CPU s built-in I/O privilege mechanisms Mechanisms to bypass OS protection features in a controlled, secure way (system calls, security subsystem, etc.)ħ Virtual Physical Operating system architecture Applications Kernel User mode Kernel mode User HardwareĨ Linux architecture Monolithic kernel. Remove some wine-specific calls and make a wrapper for them1 ReactOS is (not) Windows Windows internals and why ReactOS couldn t just use a Linux kernelĢ ReactOS is (not) Windows ReactOS is Windows Runs Windows applications Runs Windows drivers Looks like Windows ReactOS is not Windows ReactOS is a free, open source project ReactOS reuses open source code from other projects You can make your own Windowsģ Who am I? Michele KJK::Hyperion C. My patch for dsound have been last commit to reactos No modifications were made in the source since it is linked against Wine. When ReactOS gets user hooks for keyboard and mouse, then we'll be on exactly the same level as Wine here. No joystick support or 100% mouse support. Wine will never implement this for 100%, because they're using only one driver for keyboard, one for the mouse and one for the joystick. Todo: load the driver so that it looks up by a GUID id and use that driver. These change working in windows and in wine, it give us bit more stable Poll mouse and some other small change are ReactOS specific, No modifications were made in the source (if I remember correctly). We can't use Wine, so it needs to be rewritten to support hardware acceleration and software rendering. These are not all DirectX DLL files but they are the most used for apps and games. ReactOS has had software support for OpenGL 1.4 for a very long time now. If you have an Nvidia graphics driver and your games support OpenGL as renderer then your game will probably work, but without any sound. That question is hard to answer since we don't have any graphics support for DirectX in ReactOS yet.īlight_ has done an amazing job in hunting down the Hardware Acceleration bug for Nvidia OpenGL. Thanks to that we now have already very basic support for DirectX. We have taken the header files from Wine, and also some other DLLs that don't need a rewrite. We will only use part of the DirectX code from Wine, not all. How should we implement DirectX? There has been a long discussion on IRC about what is best. The information on this page might not be valid for the current state of ReactOS.Ī Wiki Administrator should look at this page and decide or discuss what to do with it.
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