Describe real and protected mode, Computer Engineering

Assignment Help:

Describe Real and protected mode:

Operation of Real mode interrupt:  When microprocessor completes executing the current instruction, it concludes whether an interrupt is active by checking (1) instruction execution, (2) single -step, (3) NMI, (4) co-processor segment overrun, (5) INTR and (6) INT instruction in the order presented. If one or more of these interrupt conditions are present, following sequence of events takes place:

1.  Contents of the flag register are pushed onto the stack

2.  Both the interrupt (IF) and trap (TF) flags are cleared. This disables INTR pin and trap or single-step feature.

3.  Contents of the code segment register (CS) are pushed onto the stack.

4.  Contents of the instruction pointer (IP) are pushed onto the stack.

5.  The interrupt vector contents are fetched and then placed into both CS and IP so that the subsequent instruction executes at the interrupt service procedure addressed by the vector.

 


Related Discussions:- Describe real and protected mode

Codevita test, provide answers for Luminous Jewels - The Polishing Game?

provide answers for Luminous Jewels - The Polishing Game?

Fundamental components of a microprocessor, Q. Fundamental components of a ...

Q. Fundamental components of a microprocessor? The word 'micro' is used in microphones, microscopes, microwaves, microprocessors, microcomputers, microprogramming, microcodes e

Show the liability of cpu in interrupt cycle, Q. Show the liability of CPU ...

Q. Show the liability of CPU in interrupt cycle? In the interrupt cycle the liability of CPU/Processor is to ensure whether any interrupts have happened checking presence of in

First order logic, "George has a dog called Ernie, which is a trained Labra...

"George has a dog called Ernie, which is a trained Labrador. Trained Labradors and poodles are obedient, and all obedient dogs are good dogs. All good dogs that have a master will

Telnet services, java program for implementation of telnet services

java program for implementation of telnet services

Define the term ''page traffic'', The term 'page traffic' describes? An...

The term 'page traffic' describes? Ans. Page Traffic describes the movement of pages in and out of memory.

What do you mean by daisy chain, Q. What do you mean by Daisy chain? Th...

Q. What do you mean by Daisy chain? This scheme provides a hardware poll. With this scheme, an interrupt acknowledge line is chain by different interrupt devices. All I/O inter

Communication traffic and message queues, The Communication Traffic gives a...

The Communication Traffic gives a pictorial view of the communication traffic in the interconnection network with respect to the time in progress. The Communication Traffic shows t

C programming, There is a pebble merchant. He sells the pebbles, that are u...

There is a pebble merchant. He sells the pebbles, that are used for shining the floor. His main duty is to take the length of the room’s sides. But he sometimes mistakes doing that

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd