Controls for initial diversion of page-frame logical content as

Details Controls for initial diversion of page-frame logical content as Controls for initial diversion of page-frame logical content as

1992-09-17

1995-02-07

Harvey, Jack B.

Cryptography

Key management

Having particular key generator

380 4, 395575, G06F 1208, G06F 1214

Patent

active

053882440

ABSTRACT:
Logical erasure is done for a virtual page unit of storage in a virtual-page-initialization process (even though the data content of a backing page frame is not physically erased). Pre-initialization controls are associated with each virtual page by a pre-initialization field in each page table entry (PTE). The pre-initialization controls operate differently for fetches and stores within the address translation process. Both fetches and stores test for a pre-initialization state in an F field in the PTE to control if and when any backing page frame can be accessed. While the F field bit is set to its pre-initialization state, no erasure writing is done in any backing page frame for a fetch or full-page store operation. An optional form identifier (form#) field is associated with the pre-initialization state field. The form# field content identifies one of plural form functions or form page frames. Each fetch-only request (occurring prior to a first store to the virtual page) is diverted to a form PF to assure that no prior data in an assigned page frame can be fetched by the user, even though no physical erasure has been done to the contents of any assigned backing page frame. No backing PF needs to be assigned for a fetch-only operation, for which there is no page fault interruption.

REFERENCES:
patent: 4718008 (1988-01-01), Chang et al.
patent: 4730249 (1988-03-01), O'Quin, II et al.
patent: 5237668 (1993-08-01), Blandy et al.

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