Question

A CALL instruction can reference only a code segment descriptor with

(a) DPL less privilege than CPL

(b) DPL equal privilege to CPL

(c) DPL greater privilege than CPL

(d) All of the mentioned

I got this question in my homework.

I need to ask this question from Privilege topic in chapter 80286-80287-A Microprocessor with Memory Management and Protection of Microprocessor

Answer 1

Correct answer is (b) DPL equal privilege to CPL

To explain: A CALL or JUMP instruction can reference only a code segment descriptor with DPL equal to CPL of the task or a segment with a DPL of equal or greater privilege than CPL.