Interrupts - computer architecture, Computer Engineering

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Interrupts

  • Interrupt-request line

o   Interrupt-acknowledge signal

o   Interrupt-request signal

  • Interrupt-service routine

o   May have no relationship to program being executed at time of interrupt

o   Similar to subroutine

  • Interrupt latency
  • Program info must be saved

Transfer of control through the use of interrupts

 

864_Interrupts.png

Interrupts

Examples of the interrupts:

  •   I/O device request, OS call, page fault
  •   power failing, arithmetic overflow
  •   Invalid opcode, breakpoint, protection violation

Interrupts (aka faults, exceptions, traps) frequently require

  •   connecting return address
  •   surprise jump (to vectored address)
  •   state change ( for example, to kernel mode)
  •   saving of PSW (including CCs)

 


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