![]() Those devices are represented by child nodes of the PCI Bus node. During startup, the PnP manager asks the PCI bus driver to enumerate the devices that are connected to the PCI bus. For example, the PCI Bus node represents the physical PCI bus on the motherboard. Several of the nodes in the device tree represent buses that have child devices connected to them. The device tree illustrates the parent/child relationships that are inherent in the PnP environment. By convention, the root device node is drawn at the bottom of the device tree, as shown in the following diagram. The root node of the device tree is called the root device node. However, some nodes represent software components that have no association with physical devices.Ī node in the device tree is called a device node. Typically, a node in the device tree represents either a device or an individual function on a composite device. Windows organizes devices in a tree structure called the Plug and Play device tree, or simply the device tree. Device nodes and the Plug and Play device tree Each device node has its own device stack. The sequence of device objects along with their associated drivers is called a device stack. Each of these drivers is associated with a device object, and the device objects are arranged in a stack. ![]() Typically, when an I/O request is sent to a device, several drivers help handle the request. In Windows, devices are represented by device nodes in the Plug and Play (PnP) device tree. ![]()
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