DOS下PCI卡内存映射空间的访问方法

Methods of Accessing PCI Memory-mapped Space in DOS

简述了PCI自动配置机制,说明了保护模式和实模式的内存管理机制以及两者之间的联系,描述了DOS操作系统下访问PCI设备的基本原理和步骤,具体给出了2种访问内存映射局部空间的方法,解释了2种方法各自的优缺点和使用范围,通过例程对相应的方法进行了说明,描述了软件最终使用效果。

This paper presents the mechanism of PCI configuration, explains the memory management mechanisim of the protect mode and real mode,describes the principle and process of accessing PCI devices in DOS, gives two methods on how to access the local space based on memory- mapped, explains the advantage and the application range of each method, gives one example and describes the effect of the software.