3 HelenOS is a portable microkernel-based multiserver operating
4 system designed and implemented from scratch. It decomposes key
5 operating system functionality such as file systems, networking,
6 device drivers and graphical user interface into a collection of
7 fine-grained user space components that interact with each other
8 via message passing. A failure or crash of one component does not
9 directly harm others. HelenOS is therefore flexible, modular,
10 extensible, fault tolerant and easy to understand.
12 ![screenshot](http://www.helenos.org/raw-attachment/wiki/Screenshots/screenshot.png "Screenshot")
14 HelenOS aims to be compatible with the C11 and C++14 standards, but does not
15 aspire to be a clone of any existing operating system and trades compatibility
16 with legacy APIs for cleaner design. Most of HelenOS components have been made
17 to order specifically for HelenOS so that its essential parts can stay free of
18 adaptation layers, glue code, franken-components and the maintenance burden
21 * [Website](http://helenos.org)
22 * [Wiki](http://helenos.org/wiki)
23 * [Tickets](http://www.helenos.org/report/1)
24 * [How to contribute](http://www.helenos.org/wiki/HowToContribute)
28 HelenOS runs on seven different processor architectures and machines ranging
29 from embedded ARM devices and single-board computers through multicore 32-bit
30 and 64-bit desktop PCs to 64-bit Itanium and SPARC rack-mount servers.
34 ### Building the toolchain
36 In order to build HelenOS, one must first build the cross-compiler toolchain
37 (either as a root or by specifying the `CROSS_PREFIX` environment variable)
38 by running (example for the amd64 architecture, further list of targets can be
39 found in the `default` directory):
43 $ ./toolchain.sh amd64
46 The toolchain script will print a list of software packages that are required
47 for the toolchain to correctly build. Make sure you install all the dependencies.
48 Unfortunately, the script cannot install the required dependencies for you automatically
49 since the host environments are very diverse. In case the compilation of the toolchain
50 fails half way through, try to analyze the error message(s), add appropriate missing
51 dependencies and try again.
53 As an example, here are some of the packages you will need for Ubuntu 12.10 (may be out of date):
56 $ sudo apt-get install build-essential libgmp-dev libmpfr-dev ppl-dev libmpc-dev zlib1g-dev texinfo libtinfo-dev xutils-dev
59 Whereas for CentOS/Fedora, you will need:
62 # sudo dnf group install 'Development Tools'
63 # sudo dnf install wget texinfo libmpc-devel mpfr-devel gmp-devel PyYAML genisoimage
65 In case the toolchain script won't work no matter how hard you try, let us know.
66 Please supply as many relevant information (your OS and distribution, list of
67 installed packages with version information, the output of the toolchain script, etc.) as
70 ### Configuring the build
72 Go back to the source root of HelenOS and start the build process:
79 Now HelenOS should automatically start building.
81 Note: If you installed the toolchain to a custom directory, make sure `CROSS_PREFIX`
82 environment variable is correctly set.
86 When you get the command line back, there should be an `image.iso` file in the source
87 root directory. If you have QEMU, you should be able to start HelenOS by running:
93 For additional information about running HelenOS, see
94 [UsersGuide/RunningInQEMU](http://www.helenos.org/wiki/UsersGuide/RunningInQEMU) or
95 [UsersGuide/RunningInVirtualBox](http://www.helenos.org/wiki/UsersGuide/RunningInVirtualBox) or
96 see the files in tools/conf.
100 HelenOS is open source, free software. Its source code is available under
101 the BSD license. Some third-party components are licensed under GPL.