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The OS should use "global IRQ numbers" for almost everything. For example, if an ethernet card is connected to "global IRQ #18" and you want to configure "global IRQ #18", then you call a "configure_global_IRQ()" function. The only place the number of IO APICs matters is inside that "configure_global_IRQ()" function - it doesn't matter for anything outside that function (doesn't matter for ...
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