Illustrate header section of a device driver, Computer Engineering

Assignment Help:

Q. Illustrate Header section of a device driver?

Header comprises information which allows DOS to identify the driver. It also comprises pointers which allow it to chain to other drivers loaded into the system.

Header section of a device driver is 18 bytes in length and comprises pointers and name of the driver.

Following structure of the header:

CHAIN DD -1    : link to next driver

ATTR DW 0    : driver attribute

STRT DW START: address of strategy

INTER DW INT: address if interrupt

DNAME DB 'MYDRIVER': driver name.

The first double word comprises a -1 which informs DOS this is the last driver in chain. If extra drivers are added DOS inserts a chain address in this double word as the segment and offset address. Chain address points to the subsequent driver in the chain. This enables additional drivers installed at any time.

The attribute word signifies the type of headers included for driver and the type of device the driver installs. It also signifies whether the driver control a character driver or a block device.


Related Discussions:- Illustrate header section of a device driver

What is input-output processors, Q. What is Input-output processors? le...

Q. What is Input-output processors? let's briefly summarize the development in area of input/output functions. These can be briefed as below: 1. CPU directly controls a peri

What are common reason for error massages while copying file, Q. What are c...

Q. What are common reason for error massages while copying file? While copying files with copy, DOS in encounters any error, it displays a suitable error massage. The common re

Write the program to use arrays, In class SlotCollection, remove the fields...

In class SlotCollection, remove the fields slot1, slot2, slot3 and slot4 and replace them by an array of slots. Modify the rest of the program to work using this array. There is

Earned value analysis, Senior management has requested a status update on t...

Senior management has requested a status update on the workstation installation project.  As a part of this update, managers have requested that you present an Earned Value analysi

Give brief description about arithmetic processing unit, Give brief descrip...

Give brief description about arithmetic processing unit To execute the arithmetic operations there is a separate section known as arithmetic processing unit in CPU. The arithme

Infix to reverse polish, A) Change the following formulas from reverse Poli...

A) Change the following formulas from reverse Polish to infix:             a) AB +C + D x               b) ABCDE + x x / B) Change the following formulas from infix to

Computer, How does computer started?

How does computer started?

What is SSTF, SSTF stands for ? Ans. Shortest-Seek-time-first scheduli...

SSTF stands for ? Ans. Shortest-Seek-time-first scheduling.

Microprocessors and interfaces, #question.write cycle timing diagram for ma...

#question.write cycle timing diagram for maximum mode of 8086 microprocessor.

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