Access control system for storage having hardware area and softw

Details Access control system for storage having hardware area and softw Access control system for storage having hardware area and softw

1984-11-15

1987-12-01

Kemeny, Emanuel S.

Boots, shoes, and leggings

G06F 1206

Patent

active

047108940

ABSTRACT:
An access control system for controlling the access to a storage which is divided into a hardware area inaccessible to ordinary programs and a software area for storing the ordinary programs, includes an address registration device and access controller. The address registration device has a plurality of entries, each of which holds a previously-used address of the storage and a flag for indicating whether the previously-used address is included in the hardware area or not. Further, the address registration device indicates whether an address at which the storage is to be accessed, is present in the address registration device or not. The access controller controls the access to the storage in accordance with the flag from the address registration device, a signal indicative of whether the to-be-accessed address of the storage is present in the address registration device or not, and the access mode which is now used.

REFERENCES:
patent: 4037209 (1977-07-01), Nakajima et al.
patent: 4038645 (1977-07-01), Birney et al.
patent: 4173783 (1979-11-01), Couleur et al.
patent: 4373179 (1983-02-01), Katsumata
patent: 4451884 (1984-05-01), Heath et al.
patent: 4456954 (1984-06-01), Bullions, III et al.
patent: 4500952 (1985-02-01), Heller et al.
patent: 4573119 (1986-02-01), Westheimer et al.

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