In the absence of cache coherency, two different processors may see two different values for the same location in memory.
在缓存缺乏一致性的情况下，两个不同的处理器可以看到在内存中同一位置处有两种不同的值。
Explicitly invalidate a region of physical memory from the cache hierarchy before doing a DMA, to ensure coherency.
明确地做一个DMA，以确保一致性无效之前从缓存层次结构的物理内存区域。
Explicitly invalidate a region of physical memory from the cache hierarchy before doing a DMA, to ensure coherency.
明确地做一个DMA，以确保一致性无效之前从缓存层次结构的物理内存区域。
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