Interview Questions Answers.ORG
Interviewer And Interviewee Guide
Interviews
Quizzes
Home
Quizzes
Interviews Operating System (OS) Interviews:BSDBulnexCompiler Linker LoaderDisk Operating System (DOS)MAC Operating SystemNative iOS EngineerOperating System (OS)OS Data StructuresOS General ConceptsOS Memory ManagementOS MultithreadingOS Process ManagementOS X Mountain LionRTOSShell ScriptingSolarisSolaris AdminSolaris CommandsSymbianUnix CommandsUNIX Operating SystemUnix Socket ProgrammingUnix/Linux programmingVxWorksWindowsWindows 7Windows AdministratorWindows CEWindows Programming
Copyright © 2018. All Rights Reserved
RTOS Interview Question:
What is difference between IRQ and FRQ?
Submitted by: Administrator"IRQ is serviced at a normal priority level and FIQ is
serviced at high priority level." This statement is wrong
FIQ is the fast interrupt i.e. the latency time taken is less because in the FIQ mode (in case of ARM architecture where these modes are encountered) the mode has an additional set of 8 general purpose registers which means in case of the banked registers there is no need to store these registers into stack when the interrupt occurs.
That means r0 to r7 only needs to be stored while moving from User mode to FIQ mode whereas while moving from to IRQ mode r0 to r12 needs to be stored.
Submitted by: Administrator
serviced at high priority level." This statement is wrong
FIQ is the fast interrupt i.e. the latency time taken is less because in the FIQ mode (in case of ARM architecture where these modes are encountered) the mode has an additional set of 8 general purpose registers which means in case of the banked registers there is no need to store these registers into stack when the interrupt occurs.
That means r0 to r7 only needs to be stored while moving from User mode to FIQ mode whereas while moving from to IRQ mode r0 to r12 needs to be stored.
Submitted by: Administrator
Copyright 2007-2024 by Interview Questions Answers .ORG All Rights Reserved.
https://InterviewQuestionsAnswers.ORG.
https://InterviewQuestionsAnswers.ORG.