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The answer is essentially hardware-level dependency injection. Before calling LD_DESCRIPTOR, the caller saves its desired test constant into a hardware latch using a micro-op called PTSAV (Protection Save). Within LD_DESCRIPTOR, another micro-op called PTOVRR (Protection Override) retrieves and fires the saved test.
，这一点在91视频中也有详细论述
So Nasa opted for the next scheduled flight: a SpaceX capsule that arrived at the ISS in late September.