> Perhaps it would be even simpler to have two interrupts. One as you > describe -- a sync interrupt -- which could not be turned off, A second > for a service request which would be triggered by firmware on the board > or the DMA controller. > > Then the issue of turning the sync interrupt off and on is moved to the > driver since the APIC Intel acronym == Advanced Programmable Interrupt > Controller) on the motherboard already has the hardware to turn off > (ignore) an interrupt.
On a typical PCI system each device only gets a single interrupt pin (a PCI bus has 4, but each device is only supposed to use 1), and several devices share an interrupt line. Thus all interrupts should be maskable on the device, and probably combined into a single output after masking. Paul _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
