Sun Microsystems, Inc.

Oracle America, Inc.

David A Butterfield

Shudong Zhou

Jerry A Gilliam

Yonghong Lai

John H Danielson

One embodiment of the present invention provides a system that uses a directory service to facilitate centralized device naming. The system operates by receiving a registration of a device at a computer system. Next, the system determines if the device has been registered with the directory service. If so, the system retrieves a name of the device from the directory service. If not, the system generates a device name for the device, and registers the device name with the directory service.

Method and apparatus for using a directory service to facilitate centralized device naming

A kernel device file system publication system for dynamically enumerating and configuring an instance of a device in the kernel device tree upon request by a user level application. The kernel device file system logically arranges system level devices in a hierarchical tree-like topology defining devices as nodes of a device tree to allow for a top-down access. The top-down access allows devices connecting to the computer system to be configured based on the physical path of the device. This process starts at a bus nexus and drives device configuration down the device tree. The bus configuration interfaces permit each nexus in the device tree hierarchy to participate in the device lookup and readdirs operations performed by the device file system. The device file system path operations are performed as an iterative sequence of bus configure operations, whereby each nexus controls the enumeration and configuration of that nexus' children.

Bus specific device enumeration system and method

The invention provides efficient apparatus and methods for using direct memory access (DMA) to store and retrieve data and associated check information in fixed-size blocks on a data storage device. A DMA controller of the invention obtains check information from computer main memory rather than computing the check information internally. In accordance with some embodiments of the invention, the DMA controller implements additional registers to specify, for example, the location of check information in computer main memory. The DMA controller itself carries out interleaving of data with its associated check information as it transfers information between main memory and the storage device. In accordance with some aspects of the invention, scatter/gather capability is supported.

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Broomfield, CO, United States of America

David A Butterfield