Allocating and resolving next virtual pages for input/output

Details Allocating and resolving next virtual pages for input/output Allocating and resolving next virtual pages for input/output

G - Physics

06

F

354/239

G06F 13/00 (2006.01)

Patent

CA 1137644

ALLOCATING AND RESOLVING NEXT VIRTUAL PAGES FOR INPUT/OUTPUT Abstract In a paged, virtual memory computer system an appara- tus 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 informa- tion 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 func- tion information into a page request function event which is stored in an I/O event stack in main storage for re- trieval and processing by the CPU. RO9-78-035

347544

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