(Full disclosure: I'm a terrible author,Document efidev(4), provider of userland access to EFI Runtime Services. but I thA link we neis created to get this in to 12.0)efirtc(4), which handles the time-of-day clock side.
Document efidev(4). Links are created for efirt(4) and efirtc(4) to efidev(4), which attempts to describe all of it.
I'm unsure of the structure and... much of it. I assume we want to give some of our own synopsis of the functionality rather than just referring to documentation on the equivalent RT call for each one, and I assume we want to document our translated return valueefirt(9) is the kernel side of this.