The main purpose of device drivers is to provide abstraction by acting as a translator between a hardware device and the applications or operating systems that use it. Otherwise, if the driver is already busy with some other request, it places the new request in the queue of pending requests. If the driver is idle when a request arrives, it starts carrying out the request immediately. Suppose a request comes to read a block N. How a device driver handles a request in the operating system is as follows:
Making sure that the request is executed successfully.To accept request from the device-independent software above to it.
A device driver performs the following jobs, such as: A device driver is generally written by the device's manufacturer and delivered along with the device on a CD-ROM. When a calling program invokes a driver's routine, the driver issues the commands to the device.ĭevice drivers encapsulate device-dependent code and implement a standard interface to contain device-specific register reads or writes. Once the device sends data back to the driver, the driver may invoke routines in the original calling program. They usually provide the interrupt handling required for any necessary asynchronous time-dependent hardware interface.Ī driver communicates with the device through the computer bus or communications subsystem to which the hardware connects.
Without a device driver, the particular hardware fails to work accordingly, which means it fails in doing a particular action for which it has been created.ĭrivers are hardware-dependent and operating-system-specific. A driver provides a software interface to hardware devices, enabling operating systems and other computer programs to access hardware functions without knowing precise details about the hardware being used.ĭevice Drivers are important for a computer system to work properly. A device driver is a computer program that operates or controls a particular device attached to a computer or automaton.
Operating System takes help from device drivers to handle all I/O devices. Next → ← prev Device Driver in Operating System
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