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Peripherals are not the ISA or CPU architecture: they are usually made by numerous parties.

Apple has designed their own GPUs since they stopped using PowerVR with A11

What does that have to do with ARM64 assembly? The ISA and CPU architecture are orthogonal to all peripherals.

These peripherals are accessed with memory-mapped IO using the same instructions any other program uses.

Documentation about ARM64 assembly shouldn't and doesn't contain specific peripheral access info. ISA docs contain info common to all CPUs implementing the spec.

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