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The RISC-V support for the Linux kernel has a new system call which is specific
to it, called `hwprobe`. With this system call you can check which features,
extensions, etc. are available on the current machine.
In order to build this example you need Linux headers for the RISC-V
architecture. You can achieve this in two ways:
1. Simply install the Linux headers from your distribution if you are already
using a RISC-V machine.
2. Build the Linux kernel and use the `LINUX_HEADERS` environment variable to
point to the headers directory (i.e. the directory produced by `make
headers_install`)
After that, build it and run it. On a QEMU machine I got the following:
```
Supports base extensions I, M, A? yes
We got back this bit map: 0000001110001101001010000001000100100000000000000000000011111011; which means:
F, D: OK
C: OK
ZBA: OK
ZBB: OK
ZBS: OK
ZICBOZ: OK
ZBC: OK
ZIHINTNTL: OK
ZFA: OK
ZIHINTPAUSE: OK
ZCA: OK
ZCD: OK
ZAWRS: OK
ZICNTR: OK
ZIHPM: OK
```
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