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

How a file can be shared among different users, Discuss the different techn...

Discuss the different techniques with which a file can be shared among different users. Several popular techniques with that a file can be shared among various users are: 1

Distinguish between combinational & sequential logic circuit, Distinguish b...

Distinguish between combinational logic circuits and sequential logic circuits. Ans: Combinational logic circuits:- (i) Outputs only depend upon present state of the i

Assembly lenguange , what is the work of pin daigram in 8086 microprocessor...

what is the work of pin daigram in 8086 microprocessor in assembly

What is the purpose of zero (z) flag and carry (c) flag, What is the purpos...

What is the purpose of zero (z) flag and carry (c) flag? Carry flag holds the carry after addition or the borrow after subtraction. Carry flag also indicates error conditions,

Data analysis and results in e-commerce, There were 50 respondents to our s...

There were 50 respondents to our survey. The first component of the data examined here focuses on student's preference (ecommerce or traditional commerce). The Second compone

C LANGUAGE, 4) A positive integer is entered through the keyboard;write a ...

4) A positive integer is entered through the keyboard;write a function to find the binary equivalent of this number using recursion.

Explain one dimensional array, Explain one dimensional arrays In one di...

Explain one dimensional arrays In one dimensional arrays array name is really a pointer to the first element in the array. Second element of the array can be accessed by using

Problem specification - logic programs, Problem Specification : Hence ...

Problem Specification : Hence given the above context for "ILP" there we can state the learning problem as follows: that we are given a set of positive and a set of negative e

Develop a program which reads hexadecimal number, Q.  Develop a program, wh...

Q.  Develop a program, which reads Hexadecimal number from an input file & convert it into Octal, Binary, and Decimal. The O/P should be written to a file & displayed accordingly.

Characteristics of decision support system, Q. Characteristics of decision ...

Q. Characteristics of decision support system? Characteristics of DSS- The qualities of the DSS are as follows: - 1. DSS focus on towards providing assistance in analyzing s

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