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Improve readme (#105)

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* Fixed "magic number" from x42 to xff

* Improved README (proxy set up)
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Jonathan Klimt 2019-03-31 10:29:08 +02:00 • committed by Stefan Lankes
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README.md
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@ -159,22 +159,27 @@ $ make install
**Note:** If you use the cross compiler outside of this repository, the compiler uses per default the library operating systems located by the toolchain (e.g. `/opt/hermit/x86_64-hermit/lib/libhermit.a`).
## Proxy
## Starting Applications with the Proxy tool
Part of HermitCore is a small helper tool, which is called *proxy*.
This tool helps to start HermitCore applications within a virtual machine or bare-metal on a NUMA node.
In principle it is a bridge to the Linux system.
If the proxy is register as loader to the Linux system, HermitCore applications can be started like common Linux applications.
The proxy can be registered with following command.
HermitCore applications are currently started with a small helper tool called `proxy`.
This tool is sets up a virtual machine or bare-metal on a NUMA node and bridges certain functionality from the application to the Linux host.
To start a HermitCore application, hand the executable to the proxy:
```bash
/opt/hermit/bin/proxy myHermiCoreApplication
```
*Optional:* The proxy can be registered as loader for HermitCore _elf_ files to the Linux system via [binfmt_misc](https://en.wikipedia.org/wiki/Binfmt_misc), so that HermitCore applications can be started like common Linux applications.
```bash
$ sudo -c sh 'echo ":hermit:M:7:\\xff::/opt/hermit/bin/proxy:" > /proc/sys/fs/binfmt_misc/register'
$ # dirct call of a HermitCore application
$ /opt/hermit/x86_64-hermit/extra/tests/hello
Hello World!!!
```
Otherwise the proxy must be started directly and get the path to HermitCore application as argument.
Afterwards, the proxy start the HermitCore applications within a VM ore bare-metal on a NUMA node.
The proxy starts the HermitCore applications within a VM.
The application host (QEMU, Uhyve or bare-metal on a NUMA node as multi-kernel) can be set via the environment variable `$HERMIT_ISLE`.
```bash
$ # using QEMU