G - Physics – 06 – F
Patent
G - Physics
06
F
354/237
G06F 13/12 (2006.01) G06F 13/28 (2006.01)
Patent
CA 1273437
Abstract A method and apparatus for data transfer completion notification to a processor is presented. Input/output (I/O) devices individually or severally have associated with them command linked lists, located in system memory. In each command linked list a processor or memory controller has placed command elements. A subset of the command elements includes elements that are specifically to be used to report status of data transfers. Each command element in this subset of command elements includes a pointer which points to a status entry. Status entries, when updated by an I/O device, are placed in a status linked list also located in memory. An I/O device may have its own status linked list or may share a single status linked list with several other devices. Status entries contain status information on transfers between an I/O device and memory locations. The insertion of status entries into a status linked list is done by hardware in an indivisible series of operations. Depending upon implementation, the hardware may then give asynchronous notification to the processor that a new element has been added to the second linked list. This notification will cause an interrupt to the currently running process in the processor.
511957
James David V.
Luiz Fernando A.
Hewlett-Packard Company
James David V.
Luiz Fernando A.
Sim & Mcburney
LandOfFree
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