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When a device is discovered, the I/O Kit requests a list of all drivers of the device’s class type from another dynamic database, the I/O Catalog. The tree continues to grow as the I/O Kit matches each nub to its appropriate bus driver, and as each bus driver discovers the devices connected to it and matches drivers to them. The Platform driver discovers the buses that are on the system and it registers a nub for each one. The Platform Expert nub then loads the correct driver for that platform, which becomes the child node of the root. This nub serves as the root of the I/O Registry tree. Exceptional cases aside, however, viewing the Registry as a tree will help you visualize how it is constructed and updated.Īt boot time, the I/O Kit registers a nub for the Platform Expert, a driver object for a particular motherboard that knows the type of platform the system is running on. The primary example of this situation is a RAID disk controller where several disks are harnessed together to appear as a single volume.
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The Registry follows the definition of a tree in nearly all respects, with the exception of a small minority of nodes that have more than one parent.
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It is most useful to think of the I/O Registry as a tree: Each object is a node that descends from a parent node and has zero or more child nodes. I/O Registry Architecture and Construction It also provides an overview of device matching and introduces applications that allow you to browse the Registry. This chapter describes the I/O Registry architecture and the planes the Registry uses to represent relationships between objects. You can also view the current state of the Registry on your computer using applications provided with the developer version of OS X. These APIs include powerful search mechanisms that allow you to search the Registry for an object with particular characteristics.
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The I/O Registry is made accessible from user space by APIs in the I/O Kit framework. Instead, it is built at each system boot and resides in memory. A dynamic part of the I/O Kit, the Registry is not stored on disk or archived between boots. When hardware is added or removed from the system, the Registry is immediately updated to reflect the new configuration of devices. The I/O Registry is a dynamic database that describes a collection of “live” objects (nubs or drivers) and tracks the provider-client relationships between them.
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