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Memory protection unit

A memory protection, storage technology, applied in the direction of instrument, internal/peripheral computer component protection, preventing unauthorized use of memory, etc., can solve problems such as statutory related parts cannot be upgraded, less than ideal solutions, etc.

Pending Publication Date: 2022-02-18
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typically, statutory relevant parts of the system cannot be upgraded, while statutory non-relevant parts allow remote firmware upgrades
This is a less than ideal solution

Method used

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Examples

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Embodiment Construction

[0014] figure 1 is a simplified block diagram of a computer system that can be used to implement a memory protection unit. In one example, computer system 1300 includes a processor 1305, a system memory 1311 (which may also include a memory protection unit), and a system bus 1314 that couples various system components including the system memory 1311 to the processor 1305. The system bus 1314 may be any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, and a local bus, using any of a variety of bus architectures. System memory 1311 includes read only memory (ROM) 1317 and random access memory (RAM) 1321 . Stored in ROM 1317 is a basic input / output system (BIOS) 1325, which contains the basic routines that facilitate the transfer of information between elements within computer system 1300, such as during start-up. The computer system 1300 may also include: a hard disk drive 1328 for reading from and writing to an internally di...

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PUM

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Abstract

The theme of the invention is a memory protection unit. One implementation is for a device. The device includes a controller having a memory protection unit, a legally relevant memory portion capable of interacting with the controller, a legally non-relevant memory portion capable of interacting with the controller, an interface in the memory protection unit that allows a privileged application to access the legally relevant memory portion and disallows an unprivileged application to access to the legally relevant portion, and an interrupt system, wherein when the unprivileged application makes an attempt to interact with the legally relevant memory portion, the memory protection unit takes an action associated with the unprivileged application.

Description

Background technique [0001] Embedded systems have become increasingly connected over time and have become just one device among many in the "Internet of Things". Some of these devices, such as gauges or smart meters, derive great value from having a high level of connectivity. These devices must also be highly secure and trustworthy to produce accurate and largely indestructible results. In practice, the parties affected by the measuring instrument cannot check the results, so they must be able to rely on the extremely high level of accuracy of the measuring instrument. [0002] One solution is to separate legally relevant data from legally non-related data and operate the device with two microcontrollers. One of the microcontrollers is dedicated to statutory related functions, while the other microcontroller is dedicated to statutory non-related functions. This allows at least the portion of the device running legally relevant systems to be secure and not tampered with. T...

Claims

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Application Information

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IPC IPC(8): G06F12/14G06F13/16G06F13/24
CPCG06F12/14G06F13/1668G06F13/24G06F21/79G06F21/572G06F21/85G06F3/0604G06F3/0637G06F3/0659G06F3/0673
Inventor R·P·索尔F·G·文森特R·多姆克I·尼科雷斯库
Owner HONEYWELL INT INC
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