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Some motherboards include Windows software that allows overclocking/overvolting the CPU while the computer is booted. How does this work? I’m looking to write a program to implement this functionality for Linux.
The method will be chipset/BIOS-specific. On recent-era systems, it’s likely that ACPI is used – so, start by examining the ACPI DSDT of the system of interest. Try correlating the device IDs / names from the DSDT against strings found in the binary utility to narrow down the device(s) you need.
The LWN.net article Writing an ACPI driver – an introduction has some good background information you’ll need.