One of the great things about Valve's hardware is that it's not locked down, and they put a lot of money into open source for SteamOS (Linux). With the upcoming new Steam Machine and Steam Frame, the open source never stops.

And here we have Igalia, one of the Free Software consultancies that Valve works with, writing up a post detailing some of the work that goes into it all. In this case, it's especially interesting for the Steam Frame. Igalia have people working on FEX, as just one example, which is a fast usermode x86 and x86-64 emulator for Arm64 Linux. Basically, it allows running x86 applications on ARM64 Linux devices - this is part of how the Steam Frame will actually run games.