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Embedded_Programming_linux_driver_5.ppt
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Chap. 6
Device Driver Concept

2
Outline
6.1 Device Driver Concept
6.2 Building and Running Modules
6.3 Char Drivers
6.4 Block Drivers
6.5 References
6.6 Exercises

3
6.1 Device Driver Concept
The Role of the Device Driver
The architecture of the Kernel
Classes of Devices and Modules

4
The Role of the Device Driver
Black boxes
System calls offer general purpose services
A programming module with interfaces
Communication Medium between application/user and hardwar
e.
Implements and supports fundamental abstractio
ns:
Process, file (file system, devices, interprocess commu
nication), etc.

5
Linux Execution Environment
Memory
b
STANDARD C
LIBRARY
MATH
LIBRARY
APPLICATION (mpg123)
Memory
Management
Filesystems
Networking
Architecture
Dependent
Code
Memory
Manager
File System
Devices
Character
Devices
Network
Subsystem
OPERATING SYSTEM
Process
Management
Device
Control
Network Interfaces
CPU
Disk
Program
Libraries
Kernel
subsyste
ms
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