Another question -- How the IRQ lines are mapped to the physical devices ??? Well, I understand that most of the physical devices have fixed IRQ lines, but what about those which donot have these as fixed ones, eg. keyboard (I am not sure if this also has fixed). ... otherwise, what if I add a new card to my PC, what IRQ lines gets mapped to this ??
You manage the device to interrupt and check which interrupt was raised. This can be done by using probe_irq_on and probe_irq_off. You can refer to LDD3 for more help on this.
