Memory protection system for effecting alteration of protection information without intervention of control program
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 28, 1984
Grant Date -
N/A
app pub date -
Mar 31, 1981
filing date -
Apr 1, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a memory protection system for a computer, memory protection information provided for each of the memory areas of a memory and memory protection information provided for each of the programs executed by a processor are collated to determine allowance/inhibition of access to the memory. By detecting that an instruction to be executed is an instruction having a particular operation and that an address of the memory to be accessed by the instruction is a particular address, the memory protection information for the program executed by the processor is alterd to allow the memory access. The alteration of memory protection information is carried out with no intervention of a control program.
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