![]() ![]() Devices should just use the resources they're given, which provides support for having the same device driver work on different machines where the resource assignments may be different, but the programming interface is otherwise the same.ĭrivers are loaded for each device that's found. Devices are assigned resources by their parent devices. Examples of resources are I/O, memory, IRQs, DMA channels, and configuration space. ![]() Each bus is then recursively enumerated, with its children continuing to enumerate their children until the bottom of the device tree is reached.Įach device that is detected should contain a list of resources for the device to use. It detects the buses present on the system as well as devices directly connected to the motherboard. The root bus driver sits at the root of the device tree. On x86 systems, the root bus driver would use ACPI. Device detection should begin with a "root bus driver". Usually, devices are organized in a tree structure, with devices enumerating their children. The main role of the device manager is detecting devices on the system. Device drivers can be implemented as loadable kernel modules (for a Monolithic Kernel) or user-mode servers (for Microkernels). They provide a high-level abstraction of the hardware to user applications while handling the low-level device-specific I/O and interrupts. ![]() Device drivers allow user applications to communicate with a system's devices. ![]()
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