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Interrupt Processing

Discussion in 'PC Hardware' started by Henning Sudbrock, Dec 19, 2005.

  1. Hi,

    as far as I know there's the possiblity that certain Interrupt Requests
    (IRQs) can be masked, either by hardware or by software.

    Assume that some device requests an interrupt while the corresponding
    Interrupt Line is masked. What happens then? Is the Interrupt Request
    put into some sort of queue? Or is it just dropped and forgotten, so
    that the device has to request an interrupt later again?

    Does anyone know what happens in that case?

    Thanks, Henning
    Henning Sudbrock, Dec 19, 2005
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  2. Henning Sudbrock

    Arno Wagner Guest

    There is a bit for every interrupt that records when one has
    happened. It is needed for the CPU to find out which interrupt
    happened in the first place. There is no way to find out how many of a
    particular interrupt happened while masking besides querying the
    devices thet triggered the interrupt(s).

    Arno Wagner, Dec 19, 2005
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