I want to know how one single irq line is shared among multiple devices, i mean how they are physically connected at hardware level, do they use multiple APIC controllers for this, or what other methods are used.
how single irq line is shared at physical hardware among multiple devices
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The most basic way to connect multiple devices to a single interrupt request line, so that every device can activate a request, is to use open collector.
When the request is granted, the acknowledge signal may be forwarded from device to device using a daisy chain.