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

Describe data transfer instructions, Q. Describe Data Transfer Instructions...

Q. Describe Data Transfer Instructions? These instructions transfer data from one location in the computer to another location without altering the data content. Most common tr

C language, Smugglers are becoming very smart day by day. Now they have dev...

Smugglers are becoming very smart day by day. Now they have developed a new technique of sending their messages from one smuggler to another. In their new technology, they are send

Explain the matlab working environment, This is the set of tools and facili...

This is the set of tools and facilities that you work with as the MATLAB user or programmer. It contains facilities for managing the variables in your workspace and importing and e

Node at the highest level in the structure, Node at the highest level in th...

Node at the highest level in the structure is known as?? Root.

Multi-layer artificial neural networks, Multi-Layer Artificial Neural Netwo...

Multi-Layer Artificial Neural Networks : However we can now look at more sophisticated ANNs that are known as multi-layer artificial neural networks it means they have hidden

Define virtualisation and explain computer architecture, Rentrag has decide...

Rentrag has decided to replace all of the computers currently being used by all of the business and office staff. He has asked you to recommend a set of specification for computers

What do you mean by e-cash, What do you mean by E-cash? E-Cash and it...

What do you mean by E-cash? E-Cash and its Properties:  Ecash is cash which is represented by two models. One is the on-line form of e-cash which allows for the completi

Assembler, Assembler: Typically a modern assembler makes object code b...

Assembler: Typically a modern assembler makes object code by translating assembly instruction into op codes, & by resolving symbolic names for memory locations and any other e

Explain analysis and synthesis phase of a compiler, Explain analysis and sy...

Explain analysis and synthesis phase of a compiler. The synthesis and analysis phases of a compiler are: Analysis Phase: In this breaks the source program in constituent

What is semaphores, What is semaphores?  A semaphore 'S' is a synchroni...

What is semaphores?  A semaphore 'S' is a synchronization tool which is an integer value that, apart from initialization, is accessed only by two standard atomic operations; wa

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