Method for providing programmable interrupts for embedded hardware used with programmable interrupt controllers

摘要

A process for generating an interrupt of programmable priority for a piece of embedded hardware associated with a first interrupt controller providing interrupts for a processor having a priority which is not programmable in a computer system including a second interrupt controller providing interrupts for the processor having a priority which is programmable. The process for causing the interrupts furnished by the first controller for the embedded hardware device to have programmable priority including the steps of generating a general interrupt at the output of the first interrupt controller in response to a signal to the first processor from the associated embedded hardware device, transferring the general interrupt to the second interrupt controller, responding to the general interrupt by signaling the associated processor that a general interrupt has been received by the second interrupt controller from the first interrupt controller, determining from the first interrupt controller the particular embedded hardware device which caused the generation of the general interrupt, and selecting an interrupt handier routine from memory for the particular embedded hardware device to provide an interrupt vector for the particular embedded hardware device to the second interrupt controller.