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Merge branch 'production' of github.com:RWTH-OS/HermitCore into production

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README.md
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# HermitCore - A lightweight unikernel for a scalable and predictable runtime behavior
The project [HermitCore](http://www.hermitcore.org) is new [unikernel](http://unikernel.org) targeting at high-performance computing.
The project [HermitCore](http://www.hermitcore.org) is new [unikernel](http://unikernel.org) targeting at a scalable and predictable runtime for high-performance and cloud computing.
HermitCore extends the multi-kernel approach (like [McKernel](http://www-sys-aics.riken.jp/ResearchTopics/os/mckernel.html)) with unikernel features for a better programmability and scalability for hierarchical systems.
On the startup of HermitCore applications, cores are isolated from the Linux system enabling the bare-metal of the applications on these cores.
This approach achieves lower OS jitter and a better scalability compared to full-weight kernels.
Inter-kernel communication between HermitCore applications and the Linux system is realized by means of an IP interface.
In addition to the multi-kernel approach described above, HermitCore can be used as classical standalone unikernel as well.
This reduces the demand on resources and improves the boot time.
In this case HermitCore runs a single-kernel exclusively on the hardware or within a virtual machine.
This reduces the resource demand and improves the boot time which is critical for cloud computing applications.
It is the result of a research project at RWTH Aachen University and is currently an experimental approach, i.e., not production ready.
Please use it with caution.
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On Debian-based systems the packets can be installed by executing:
```
sudo apt-get install qemu-system-x86 nasm texinfo libmpfr-dev libmpc-dev libgmp-dev libisl-dev flex bison
sudo apt-get install qemu-system-x86 nasm texinfo libmpfr-dev libmpc-dev libgmp-dev libisl-dev flex bison
```
## Installing HermitCore with by using debian packets
We provide binary packets for debian-based systems containing the complete HermitCore toolchain including a cross-compiler.
To install the packets you have to execute the following commands:
```
echo "deb [trusted=yes] https://dl.bintray.com/rwth-os/hermitcore vivid main" | sudo tee -a /etc/apt/sources.list
sudo apt-get -qq update
sudo apt-get install binutils-hermit newlib-hermit pthread-embedded-hermit gcc-hermit libhermit
```
This toolchain is able to build applications for [classical unikernel](#building-and-testing-hermitcore-as-classical-standalone-unikernel) environments within virtual machines or bare-metal in a multi-kernel environment.
For the latter, you have to install the modified Linux kernel.
An introduction to this execution mode is provided in section [Building and testing HermitCore as multi-kernel on a real machine](#building-and-testing-hermitcore-as-multi-kernel-on a-real-machine).
## Building and testing HermitCore as multi-kernel within a virtual machine
1. Please make sure that you cloned this repository and all its submodules.
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1. In principle you have to follow the tutorial above.
After the configuration, building of the cross-compilers and all example application (Step 5 in the [above tutorial](#building-and-testing-hermitcore-within-a-virtual-machine)), a modified Linux kernel has to be installed.
Please clone the repository with the [modified Linux kernel](https://github.com/RWTH-OS/linux).
Please clone the repository with the [modified Linux kernel](https://github.com/RWTH-OS/linux).
Afterwards switch to the branch `hermit` for a relative new vanilla kernel or to `centos`, which is compatible to the current CentOS 7 kernel.
Configure the kernel with `make menuconfig` for your system.
Be sure, that the option `CONFIG_HERMIT_CORE` in `Processor type and features` is enabled.