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

Process of minimax algorithm, Process of Minimax algorithm: Our aim is...

Process of Minimax algorithm: Our aim is just to write the best of best score on the top branches of the tree that player one can guarantee to score if he chooses that move.

Determine the framed data including a parity bit, Determine the Framed data...

Determine the Framed data including a parity bit   For illustration when even parity is chosen, parity bit is transmitted with a value of 0 if the number of preceding

DoDAF OV-2 for a green datacenter, How do I create a DoDAF OV-2 for the con...

How do I create a DoDAF OV-2 for the construction of a green data center?

Expalin massively parallel system and scalability, Massively Parallel Syste...

Massively Parallel System Indicates to a "parallel computer system" involving a huge number of processors. The numbers in a huge number of processors keeps increasing and curre

Determine the quivalence partitioning, Determine the quivalence Partitionin...

Determine the quivalence Partitioning? The division of domain data into dissimilar equivalence data classes is performed using Equivalence Partitioning. It is executed for redu

Explain the differences of casex and casez, Explain the differences of case...

Explain the differences of casex and casez over the case statement? casex operator has to be used when both high impedance value (z) and unknown (x) in any bit  has  to  be  t

Data structure, Process: pid start time end time priority t...

Process: pid start time end time priority timeslice list of CPU bursts list of IO bursts (the number of IO burst will always be 1 less than the number of CPU

How adaptive transmission helps tcp to maximize connection, How adaptive tr...

How adaptive transmission helps TCP to maximize throughput on each connection? To know how adaptive retransmission helps TCP maximize throughput upon all connection, see a case

Two properties of recursion, Two properties of recursion are:- 1. A sm...

Two properties of recursion are:- 1. A smallest, base case that is processed without recursion and acts as decision criterion for stopping the method of computation and 2.

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