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 uml architecture, Takes care structural and behavioural aspect of a...

Takes care structural and behavioural aspect of a software system. Contains software usage, functionality, performance, economic, reuse, and technology constraints.

Show the connection between different networks, Q. Show the Connection betw...

Q. Show the Connection between different networks? The connection between different stages is made in following manner:  all outputs of 1 st crossbar switch of first stage a

How will these instructions perform?, Q. How will these instructions perfor...

Q. How will these instructions perform? Let's assume that above machine instructions are stored in three consecutive memory locations 1, 2 and 3 and PC contains a value (1) tha

Explain is cgi a script or a program, The distinction is semantic. Traditio...

The distinction is semantic. Traditionally, compiled executables (binaries) are known as programs, and interpreted programs are usually known as scripts. In the context of CGI, the

How do i publish an xml message, Follow these steps: 1. Produce XML from...

Follow these steps: 1. Produce XML from the DOM document tree. 2. Serialize the generated DOM document to a StringWriter. 3. Call toString on the StringWriter and pass it into

What is called network, Network with point-to-point link is known as (...

Network with point-to-point link is known as (A) Fully Connected Network        (B)  Half Connected Network (C)  Duplex Connected Network    (D)  None of these Ans:

Difference among msgbox statement and msgboxq function, MsgBox is a built i...

MsgBox is a built in VB function which shows a Message Box and MsgBoxQ is a function definite by the user.

What is non-volatile bios, Nonvolatile BIOS memory refers to a small memory...

Nonvolatile BIOS memory refers to a small memory on PC motherboards that is used to kept BIOS settings. It was traditionally known as CMOS RAM because it used a volatile, low-power

Sequence of micro -operations to perform a specific function, Q. Sequence o...

Q. Sequence of micro -operations to perform a specific function? A digital system executes a sequence of micro-operations on data stored in registers or memory. Specific sequen

High level expertise, The most useful feature of an expert system is the h...

The most useful feature of an expert system is the high level expertise it provides to aid in problem solving. This expertise can represent the best thinking of the top

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