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Module 2: x86 Architecture, CPU Control, I/O, Memory System Design

20222m

Which table handle stores the addresses of the interrupt handling sub-routines?

(i) Interrupt-vector table
(ii) Vector table
(iii) Symbol link table
(iv) None of the above

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Answer: (i) Interrupt-vector table

Explanation:

  • Interrupt Vector Table (IVT) is an array in low memory (e.g., 0x00000 in x86) storing addresses (vectors) of ISRs (Interrupt Service Routines) indexed by interrupt number/type.
  • On interrupt, CPU uses interrupt number × entry size to fetch vector and jump to handler.
  • Vector table (ii) is generic; Symbol link table is unrelated (linking).

Hence correct is Interrupt-vector table.

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