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A user-space device driver can do many of the things that kernel drivers can t, such as perform a long-running computation, block while waiting for an event, or read files from the file system. Unlike kernel drivers, a user-space device driver can us
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本书以作者亲自在PC上开发嵌入式操作系统“HelloChina”的全过程为主线，详细地叙述自己动手写嵌入式操作系统所需的各方面知识，如加载和初始化、Shell、线程的实现、内存管理机制、互斥和同步机制及中断和定时机制的实现，以及设备驱动程序管理框架，应用编程接口等。(The whole process of the book by the author personally developed embedded operating system "HelloChina" in
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为字符设备编写设备驱动程序，实现简单的消息传递方式。 内核维护一个消息列表。 为了限制内存使用，我们对每条消息施加4KB的限制，并且还限制所有消息的大小，最初为2MB。(Write a device driver for a character device which implements a simple way of message passing. The kernel maintains a list of messages. To limit memory usage, we imp
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