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我知道外围设备,如硬驱动程序、软盘驱动程序等,是通过读取/写入设备 Controller 上的某些控制寄存器来控制的。
我想知道以下问题:
最佳答案
对于比较新的PC兼容机“裸机”,你可以在Conventional PCI中找到一些答案。描述:
In a typical system, the firmware (or operating system) queries all PCI buses at startup time (via PCI Configuration Space) to find out what devices are present and what system resources (memory space, I/O space, interrupt lines, etc.) each needs. It then allocates the resources and tells each device what its allocation is.
The PCI configuration space also contains a small amount of device type information, which helps an operating system choose device drivers for it, or at least to have a dialogue with a user about the system configuration.
Finally, PCI configuration space provides access to 256 bytes of special configuration registers per PCI device. Each PCI slot gets its own configuration space address range. The registers are used to configure devices memory and I/O addresses ranges they should respond to from transaction initiators. When a computer is first turned on, all PCI devices respond only to their configuration space accesses. The computers BIOS scans for devices and assigns Memory and I/O address ranges to them.
关于c - 如何确定外围设备的端口号?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2708263/
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