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Access control apparatus, access control method, memory access control device, and memory access control method

An access control device and storage technology, applied in the direction of protecting storage content from loss, preventing unauthorized use of memory, memory address/allocation/relocation, etc., and can solve problems such as unauthorized data read operations

Inactive Publication Date: 2009-07-01
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a solution requires more memory to store the memory key value
[0007] In addition, memory can be accessed when a fault occurs in the memory, which can lead to unauthorized data read operations

Method used

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  • Access control apparatus, access control method, memory access control device, and memory access control method
  • Access control apparatus, access control method, memory access control device, and memory access control method
  • Access control apparatus, access control method, memory access control device, and memory access control method

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Embodiment Construction

[0107] Embodiments of an access control device, an access control system, a processor, an access control method, a memory access control device, a memory access control system, and a memory access control method will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the following examples.

[0108] figure 1 An overall structure of an access control system 1 according to the first embodiment is shown. The access control system 1 includes an access control device 10 , a processor 20 , a memory controller 30 and a memory 40 .

[0109] The processor 20 and the memory 40 are connected to each other, and to the memory controller 30 and the access control device 10 . Memory controller 30 provides arbitration for differences between the protocol of processor bus 22 (a signal line extending directly from the processor) and the protocol of memory bus 42 . In other words, the memory controller 30 calculates the d...

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PUM

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Abstract

An access control device, comprising: a parity code generator for generating a parity code for raw data to be written into a memory; a parity code adder for generating a parity code by adding the parity code to the original data Data added with a parity check code; a first syndrome generator, configured to generate a first syndrome of the first mask data, so as to mask the data added with a parity check code. The first syndrome is a value previously associated with the first access code and used by the writer to access the memory. The device further includes: a first mask generator, which generates first mask data according to the first syndrome, the first access code, and the first memory address; An XOR calculation is performed between the code verification data and the first mask data to obtain the first calculated data; a writing unit writes the first calculated data into the memory.

Description

field of invention [0001] The present invention relates to an access control device that can control memory access. The present invention also relates to an access control system, a processor, an access control method, a memory access control device, a memory access control system, and a memory access control method. technical background [0002] In modern computer systems, a multi-programming method is adopted, through which several processes (programs, tasks or jobs) can be switched, so that various resources in the computer system, such as memory or CPU, can be effectively used. [0003] In such a system, data in memory private to one process may be seen by another process or corrupted by overwriting. [0004] To solve this problem, a widely used method is to judge whether access should be allowed by comparing the key value of the process with the memory key value of the memory to be accessed. The "memory key value" is information recorded for each predetermined size of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F12/16G06F11/10G06F12/14G06F12/02
Inventor 金井达德吉井谦一郎
Owner KK TOSHIBA