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AssigneeInternational Business Machines Corporation
InventorsWilliam E. Hammer, David O. Lewis, John W. Reed, Thomas S. Robinson, Keith K. Slack
Estimating the term…
In a paged, virtual memory computer system an apparatus is provided for enabling I/O device adapters to request the CPU to allocate or resolve virtual pages into main storage pages as required for I/O data transfers. The I/O adapter provides the channel virtual address information specifying the requested page and channel function information which indicates whether the requested page is to be transferred from secondary storage into main storage or merely allocated as a page in main storage. The channel forms the virtual address information and the channel function information into a page request function event which is stored in an I/O event stack in main storage for retrieval and processing by the CPU.
In a computer system having virtual memory partitioned into pages, an addressable main storage for storing an input/output (I/O) event stack and in which virtual pages may reside, a central processing unit (CPU) for retrieving I/O events from the I/O event stack and for processing said I/O events, a plurality of I/O adapters connected to control I/O devices and a channel connecting the plurality of I/O adapters to the CPU and main storage, the improvement comprising:
In a computer system having virtual memory partitioned into pages, an addressable main storage for storing an I/O event stack and in which virtual pages may reside, a CPU for retrieving I/O events from the I/O event stack and for processing said I/O events, a plurality of I/O adapters connected to control I/O devices, a channel connecting the plurality of I/O adapters to the CPU and main storage, and a plurality of I/O registers, the improvement comprising:
Dependencies are inferred from the claim text.