Hi, i need to have a low-latency interrupt on a 405-based chip with linux 2.4.
Did anybody yet worked on this? I thought about routing the CriticalInterrupt pretty much the same way as the HardwareInterrupt, but with disabling MSR_CE. MSR_CE would be enabled then even in (normal) interrupts, we probably have to add a __crit_cli and __save_and_crit_cli as someone already suggested. Does CRIT_EXCEPTION work? Is do_IRQ reentrant? Should i use the same interrupt processing as a normal hardware interrupt, with the exception that only "critical"-flagged interrupts are processed? Any suggestions? The background: the IBM-STB045xx's capture port, which we use for IR-decoding, doesn't have any buffering, so when a time-consuming interrupt is processed (PIO network, maybe PIO ide), we miss IR cycles. Felix ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
