And the former isn't even an instruction, set a single bit in ACTLR_EL1 and off ... | Hacker News

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		my123 on Jan 20, 2021 \| parent \| context \| favorite \| on: Linux Running on Apple M1 And the former isn't even an instruction, set a single bit in ACTLR_EL1 and off you go. The second is an extension that talks to a coprocessor that's quite application specific. And that has an unstable ISA that changes every year. Probably not the biggest priority for anyone.

saagarjha on Jan 20, 2021 [–]

Well, four bits: in addition ACTLR_EL1_EnTSO to the kernel also sets ACTLR_EL1_EnAPFLG | ACTLR_EL1_EnAFP | ACTLR_EL1_EnPRSV, whatever those are.

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