On 5/4/07, k b <k_bisla@xxxxxxxxxxx> wrote:
hmm... so then how does the int handler know if it needs to service an interrupt. I mean it could be that the handler was invoked by the kernel when it walked through all the int handlers. so how does the handler know if there is actually an interrupt to be serviced if there's not hardware reg on the device to tell that.
Hi KB, What Mike is getting at is this: It is upon the handler to determine whether the device it services, has actually generated this interrupt. How the ISR enquires the IRQ status from the device is device specific. In most of the situations, the device has a register which says so. However, I could not understand your reasoning behind the statement that a device generating seldom interrupts should not be sharing the IRQ line with a device device generic IRQs often. Can you please elaborate? Thanks, Rajat -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
