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

1978-10-23

1980-10-28

Boudreau, Leo H.

Boots, shoes, and leggings

G06F 300

Patent

active

042310881

ABSTRACT:
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.

REFERENCES:
patent: 3786427 (1974-01-01), Schmidt et al.
patent: 3839706 (1974-10-01), Borchsenius
patent: 3976977 (1976-08-01), Porter et al.
patent: 4092715 (1978-05-01), Scriver

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