Mind blown indeed. But don't these need special CPU instructions? Which x86 inst... | Hacker News

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		wfunction on July 20, 2014 \| parent \| context \| favorite \| on: Introduction to Coreboot, an open source BIOS Mind blown indeed. But don't these need special CPU instructions? Which x86 instructions do this? (Or is this done through a special hardware pin on the CPU?)

simcop2387 on July 20, 2014 [–]

Apparently it's done through controlling the MTRR registers on the CPU:

http://rere.qmqm.pl/~mirq/cache_as_ram_lb_09142006.pdf

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