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arkingc committed Jun 30, 2018
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2 changes: 2 additions & 0 deletions 操作系统/操作系统.md
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Expand Up @@ -234,6 +234,8 @@ DMA的工作方式如下,当处理器需要读写一块数据时,它给DMA

之后处理器继续其它工作。处理器将这个操作委托给DMA模块,DMA模块直接与存储器交互,这个过程不需要处理器参与。当传送完成后,DMA模块发送一个中断信号给处理器。因此只有在开始和结束时,处理器才会参与

![](../pic/os-1-10.png)

# 第二章.操作系统概述

## 1.操作系统的目标和功能
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