Memory copying method and device as well as SOC (system on chip)

Abstract

The invention provides a memory copying method and device as well as an SOC (system on chip). The memory copying method comprises steps as follows: a memory copying instruction is received, wherein the memory copying instruction includes a source address and a destination address of to-be-copied data in the memory and the length of the to-be-copied data; a read request is sent to a cache directory storage device corresponding to the source address, wherein the read request carries the source address, so that the cache directory storage device corresponding to the source address can acquire corresponding to-be-copied data according to the source address; a read response sent by the cache directory storage device is received, wherein the read response carries the to-be-copied data; and a write-in request is sent to a cache directory storage device corresponding to the destination address, wherein the write-in request carries the to-be-copied data, so that the cache directory storage device can write the to-be-copied data into the memory corresponding to the destination address. According to the memory copying method and device as well as the SOC, the memory copying efficiency can be improved, and systematic consumption can be reduced.

Description

technical field [0001] The invention relates to computer technology, in particular to a memory copy method, device and on-chip system. Background technique [0002] Memory copy refers to copying a piece of continuous data in memory from one address to another. At present, the computing speed of processors is increasing rapidly, but the ability of processors to access memory (memory access capability) is increasing slowly. The memory copy process hardly requires any calculation, but requires a large number of memory access operations, occupying a large amount of memory access bandwidth, a precious memory access resource. [0003] Memory copying in the era of multi-core processors is more complicated. The same data may exist in both cache and memory. If the value of this data in the cache is not the same as the value in the memory, it is called cache inconsistency; if they are the same, it is called cache consistency. Inconsistencies in the cache may cause system errors, es...

AI Technical Summary

Problems solved by technology

In the prior art, DMA (Direct Memory Access, direct memory access) technology is adopted, and the DMA module used in the memory access system is a module independent of the last level of cache and memory controller, as an external module, in During the memory copy process, the read command sent to the last level cache needs to consume more resources

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