Review: Handling an Interrupt/Exception

• Invoke specific kernel routine based on type of interrupt

  • interrupt/exception handler

• Must determine what caused interrupt

  • could use software to examine each device
  • PC = interrupt_handler

• Vectored Interrupts

  • PC = interrupt_table[i]

• Clear the interrupt

• kernel initializes table at boot time

• May return from interrupt (RETT) to different process (e.g, context switch)

Service

Routines

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