设备、文件描述符与驱动程序
输入输出设备
- 文件描述符
- 指向操作系统对象的 “指针”
- Everything is a file
- 通过指针可以访问 “一切”
- 对象的访问都需要指针
- open, close, read/write (解引用), lseek (指针内赋值/运算), dup (指针间赋值)
- 指向操作系统对象的 “指针”
- 系统调用创建文件对象。
- rules.d规则。udev
- udisk2
- 输入输出设备就是能与 cpu 交换数据的接口
- 给寄存器 “赋予” 一个内存地址 (Address Decoder)
- CPU 可以直接使用指令 (in/out/MMIO) 和设备交换数据
- 是的，就这么简单
- GPIO
- 使用Memory-Mapping的方式访问
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