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by vardump 3977 days ago
> It was an embedded system where someone got the idea to create bitfield access to a cpu register.

Most PCI/PCIe devices have memory mapped registers that behave similarly. Like DMA registers... Although it's a bit bad idea to trigger send on writing 0 bit to the corresponding bit in the register. But hardware memory mapped registers are weird and these things are common. Like writing 1-bit to clear.