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What x86-64 instructions are used to enable/disable other cores/processors and how does one start executing code on them?
Is there documentation somewhere on how this is done by the operating system?
Pretty painful to get an x86 up and going… it is not so much in the cores as in the APIC system. You need to look into the docs for your chipset, tends to be pretty much hidden unfortunately.
You will have to be at the kernel level, definitely. Looking at Linux sounds like a good idea.