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 asp.net authentication providers and iis security, What is ASP.NET ...

What is ASP.NET Authentication Providers and IIS Security? ASP.NET implements authentication using authentication providers, which are code modules that verify credentials and

How many lists can a program can produce, How many lists can a program can ...

How many lists can a program can produce? Every program can produce up to 21 lists: one basic list and 20 secondary lists.  If the user makes a list on the next level (that is,

What are the advantages of public key cryptography, What are the advantages...

What are the advantages of Public Key Cryptography? Advantages of Public Key Cryptography are illustrated in below: a) Increased convenience and security and b) Electro

Functionality of hyper thread processor, Hyper-threading works by duplicati...

Hyper-threading works by duplicating those sections of processor that kept the architectural state-but not duplicates the main implementation resources. This allows a Hyper-threadi

How do you control instructions like branch, How do you control instruction...

How do you control instructions like branch, cause problems in a pipelined processor? Pipelined processor gives the best throughput for sequenced line instruction. In branch in

Explain call and return statements, Q. Explain Call and Return Statements? ...

Q. Explain Call and Return Statements? CALL:       CALL X    Procedure Call to procedure/function named X   CALL instruction causes the following to happen:  1.  Decre

Applications of linked list, What are the Applications of Linked List are ...

What are the Applications of Linked List are a) Fixed block storage allocation b) garbage collection

Performance of a parallel algorithm - number of processors, Factor which he...

Factor which helps in analysis of parallel algorithms is the total number of processors needed to deliver a solution to a provided problem. So for a given input of size let's say n

Additions of numbers by using 2’s complement, Add +25 to -15 by using 2's c...

Add +25 to -15 by using 2's complement ? Ans. Firstly convert the numbers 25 and 15 in its 8-bit binary equivalent and determine the 2's complement of 15, after that add +25 to -

The current image in gimp, How do we merge an image from a file to the curr...

How do we merge an image from a file to the current image in GIMP? Ans) Use "File then Open as Layers" menu command or just take the file to a window and drop it there. The file w

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