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Update installation FAQ re: CPU support details #133

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26 changes: 22 additions & 4 deletions src/content/docs/FAQ/installation.mdx
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Expand Up @@ -12,24 +12,42 @@ import { Aside } from "@astrojs/starlight/components";

### Which CPUs does aerynOS support?

aerynOS is currently only compiled for the x86-64-v2 target architecture, which means that it will run on CPUs supporting x86-64-v2 or greater psABI feature levels.
aerynOS is currently compiled solely for the x86-64-v2 target architecture. It will also run on CPUs supporting x86-64-v3, and x86-64-v3, because psABI feature levels are backwards compatible.

Checking the currently supported x86-64 psABI feature level of a system can be done by typing the following command in a terminal as a normal user:
To check which you have, type the following command in a terminal (as a normal user):

```
/usr/lib64/ld-linux-x86-64.so.2 --help | grep "x86-64-"
```

On an x86-64-v2 based system, you will see the following output:
On an x86-64-v2 based system, you should see the following output:

```
x86-64-v4
x86-64-v3
x86-64-v2 (supported, searched)
```
If instead it yields an error such as:

`--help: error while loading shared libraries: --help: cannot open shared object file`

...you most likely have an older glibc library, in which case...

Try the code block below instead. It relies on the kernel, with no binary dependencies, so should work for you.

```awk '
BEGIN {
while (!/flags/) if (getline < "/proc/cpuinfo" != 1) exit 1
if (/lm/&&/cmov/&&/cx8/&&/fpu/&&/fxsr/&&/mmx/&&/syscall/&&/sse2/) level = 1
if (level == 1 && /cx16/&&/lahf/&&/popcnt/&&/sse4_1/&&/sse4_2/&&/ssse3/) level = 2
if (level == 2 && /avx/&&/avx2/&&/bmi1/&&/bmi2/&&/f16c/&&/fma/&&/abm/&&/movbe/&&/xsave/) level = 3
if (level == 3 && /avx512f/&&/avx512bw/&&/avx512cd/&&/avx512dq/&&/avx512vl/) level = 4
if (level > 0) print "Highest supported psABI level: x86-64-v" level
}
'```

<Aside type="note">
If the x86-64-v3 and x86-64-v4 psABI feature levels were supported, they would also show `(supported, searched)` next to them. aerynOS will still work on these systems.
If the advanced x86-64-v3 and x86-64-v4 psABI feature levels were also supported, they would also show as `supported, searched`. aerynOS will still work on these systems, but at an x86-64-v2 feature level.
</Aside>

### Does aerynOS offer NVIDIA GPU support?
Expand Down