Memory access authority control method and memory management system thereof

摘要

A memory access authority control method and a memory management system utilizing the method. By partitioning and designating permissible memory access intervals to different service programs in one system, it is ensured that each service program cannot access other service programs' confidential data. Thus, the security of confidential data is guaranteed.

主权项

1. A memory access authority control method, applicable to a memory comprising a command address space and a service address space, the command address space storing a plurality of caller programs corresponding to a plurality of non-overlapped program counter value intervals, respectively, the service address space storing a plurality of non-overlapped permissible access intervals corresponding to the plurality of caller programs, respectively, the memory access authority control method comprising:
accessing a first caller program among the plurality of caller programs in the command address space according to a current program counter value stored in a program counter; querying a look-up table for a first permissible access interval in the service address space according to the current program counter value, wherein the look-up table stores a plurality of mapping relationships between the plurality of program counter intervals and the plurality of permissible access intervals in the service address space; determining whether an access target address of the first caller program falls in the first permissible access interval to generate a result; and determining whether to permit an access of the first caller program to the service address space according to the result.