Mechanism supporting execute in place read only memory applicati

Details Mechanism supporting execute in place read only memory applicati Mechanism supporting execute in place read only memory applicati

1996-07-12

1998-10-13

Lall, Parshotam S.

Electrical computers and digital processing systems: memory

Address formation

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711165, 711115, G06F 1200

Patent

active

058227849

ABSTRACT:
A program stored within an application memory storage area of a removable system resource has a more than one step and at least one of the steps requires a datum be written to a portion of the application storage area. The program is executed from the removable resource. A page table is built which has one page entry per page of the program. A given page entry maps a physical address for the page corresponding to the page entry to a virtual address for the corresponding page. Each page entry of the page table is marked to indicate that the page corresponding to the page entry has a read-only status. The program is then executed step-by-step. When the step requiring the datum to be written to the application storage area occurs, a faulting page is determined. The faulting page is the page that contains the portion of the application storage area to which the datum is to be written. The faulting page is copied to a writable area of system memory and the page entry corresponding to the faulting page is updated so that it points to the copy of the faulting page and indicates that the faulting page has a "read/write" status. The step requiring the datum to be written to the portion of application storage area is then re-executed and the datum is written to the copy of the faulting page in the writable area of system memory.

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