System for adapter with status and command registers to provide

Details System for adapter with status and command registers to provide System for adapter with status and command registers to provide

1996-04-01

1999-07-13

Lee, Thomas C.

395834, G06F 922, G06F 1314

Patent

active

059238976

ABSTRACT:
A method and system for communicating extended information, including status information, from a hardware device to a computer operating system. An adapter detects changes in the status of hardware devices attached thereto, including inserted, removed or requested-to-be-removed status, places information regarding that status in registers accessible to the operating system, and generates an interrupt. In handling the interrupt, the operating system reads the status information from the registers and takes appropriate action. The described framework extensibly provides the operating system with the ability to issue commands to the adapter such as commands which obtain information on the capabilities of the adapter and the hardware devices attached thereto. Another such command enables the operating system to direct the adapter to mechanically eject a device attached thereto, such as in response to detection of request-to-be-removed status. The framework thus provides for the automatic and safely-controlled removal of a hardware device under the direction of the operating system.

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