Dynamic memory area of embedded equipment without memory management unit and management method

Abstract

The invention discloses a dynamic memory area of embedded equipment without a memory management unit and a management method, and the dynamic memory area comprises a dynamic memory initialization module which is used for initializing the memory area so as to enable the memory space to be in an idle state; a dynamic memory allocation module which is used for allocating a memory space with a specified size, marking the memory space as a used state and returning a unique identifier of the allocated space; a dynamic memory release module which is used for marking the memory space to be in an idlestate according to the unique identifier of the allocated memory; and a dynamic memory fragment arrangement module which is used for scanning the memory space and dynamically arranging the memory fragments. According to the invention, the problem of memory application failure is greatly reduced, a plurality of memory allocation regions can be supported, the memory allocation areas are independentfrom one another and do not influence one another, synchronous protection is performed, and a multi-task program is supported.

Description

technical field [0001] The invention relates to the technical field of dynamic memory management, and in particular relates to a dynamic memory management method of an embedded device without a memory management unit. Background technique [0002] Memory fragmentation problem: In the process of dynamic memory allocation and release, the small memory fragments generated cannot be reallocated and used. This problem caused program memory application to fail, affecting program stability. [0003] For a CPU with an MMU function, memory addresses are divided into virtual addresses and physical addresses. Dynamic memory allocation can allocate virtual addresses first, and then allocate physical addresses in units of pages (generally 4096 bytes) when using them, and associate virtual addresses with physical addresses. This method can effectively reduce the problem of memory fragmentation. There is no MMU embedded device, the CPU does not support the MMU function, and there is no ...

AI Technical Summary

Problems solved by technology

[0002] Memory fragmentation problem: In the process of dynamic memory allocation and release, the small memory fragments generated cannot be reallocated and used

After multiple allocations and releases, there will be some discontinuous small memory that cannot be re-allocated and used, which is prone to memory fragmentation problems

Moreover, in existing devices without MMU, the memory is allocated as a physical address. Only when the memory is released, there is a chance to organize and merge the memory, and the memory to be released and the adjacent memory must be free memory.

With such characteristics, it is very easy to generate a large number of memory fragments, and the export memory application fails

Function reentrancy is not supported, there can only be one memory allocation area, and synchronization protection is not supported, resulting in the inability to support the use of multi-tasking programs, direct manipulation of memory addresses, and the risk of memory overflow

Images