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AR# 19636

6.2 EDK - How are interrupts prioritized? What are the different interrupt priority schemes?

Description

General Description:

How are interrupts prioritized? What are the different interrupt priority schemes?

Solution

In version 1.00.b of the Interrupt Controller driver, priority was fixed; once an interrupt was done being serviced, the next interrupt that fired would get serviced.

In version 1.00.c of the Interrupt Controller driver, there now is a choice in priority schemes:

* XIN_SVC_SGL_ISR_OPTION Service the highest priority pending interrupt and then return.

* XIN_SVC_ALL_ISRS_OPTION Service all of the pending interrupts and then return.

XIN_SVC_SGL_ISR_OPTION scheme services pending interrupts in order of priority.

XIN_SVC_ALL_ISRS_OPTION scheme services pending interrupts in order of occurrence.

AR# 19636
Date Created 09/03/2007
Last Updated 12/15/2012
Status Active
Type General Article