04589064 is referenced by 164 patents and cites 11 patents.

A data processing apparatus includes at least one processing unit, a main storage unit, a main storage control unit, a key storage unit and a key storage control unit. The main storage unit is divided into blocks and the key storage unit stores main storage protection keys, each of which corresponds to one of the blocks of the main storage unit. Key storage access requests are received from a processing unit or the main storage control unit by the key storage control unit whenever data is to be read from or written to a block of main storage. The key storage control unit registers the key storage access requests in a key queue, prevents duplicate access requests from being registered, and processes the queued key storage access requests. The processing of key storage access requests includes updating the contents of the key storage unit to maintain a record of accesses to the main storage unit and controlling accesses to the main storage unit by permitting or denying access thereto.

Title
System for controlling key storage unit which controls access to main storage
Application Number
6/469817
Publication Number
4589064
Application Date
February 25, 1983
Publication Date
May 13, 1986
Inventor
Minji Senda
Yokohama
JP
Satoru Koga
Kawasaki
JP
Takashi Chiba
Kawasaki
JP
Agent
Staas & Halsey
Assignee
Fujitsu
JP
IPC
G06F 9/00
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