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

Xor gate, The XOR gate. The exclusive OR or XOR gate is similar to a tw...

The XOR gate. The exclusive OR or XOR gate is similar to a two input OR gate. The output of an XOR gate is logic 1 only when one input or the other input is high and is 0 when

Datatype functions for message passing, Q. Datatype Functions for Message P...

Q. Datatype Functions for Message Passing? Datatype: It denotes type of data in message. This field is essential in the sense that MPI supports heterogeneous computing and diff

Explain concurrent sharing, Explain Concurrent Sharing Here a number of...

Explain Concurrent Sharing Here a number of programs that may share a file simultaneously. While this is the case, it is necessary to prevent mutual interference among them. Th

What do you mean by parallel virtual machine, Q.What do you mean by Paralle...

Q.What do you mean by Parallel virtual machine? PVM is essentially a simulation of a computer machine running parallel programs. It is a software package which allows a heterog

Define the full form of ssl, Define the full form of SSL SSL has becom...

Define the full form of SSL SSL has become fundamental to the spread of Internet community, and commerce and trade over Internet. Over years, the spread of its use for an incr

EME, How can i made Carnot engine

How can i made Carnot engine

Don''t care states, The conflict between too hot and too cold or too slow a...

The conflict between too hot and too cold or too slow and too fast can be resolved using don't care states. Don't care states are used when i) the state of the output is not

Full form of ldap, LDAP stands for LDAP- Light weight Directory Access...

LDAP stands for LDAP- Light weight Directory Access Protocol.

Dbms, What are the disadvantages of file processing system?

What are the disadvantages of file processing system?

The voltage of telephone given by telephone companies, Telephone companies ...

Telephone companies normally provide a voltage of to power telephones? Telephone companies usually give a voltage of to power telephones -48 volts DC.

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