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本书揭示了如何给大多数的设备编写驱动程序的信息，这些信息迄今仅通过口头或者隐晦的源代码注释被共享。你不必是一个内核高手就可以理解并享受本书，所需要的只是C以及Unix系统调用方面的背景知识。在不需要特殊的硬件设备就能编译和运行的详细示例的指引下，你将学会如何给字符设备、块设备和网络接口编写驱动程序。PCI、USB和tty(终端)子系统都单列一章。本书为那些对操作系统的工作机制好奇的人提供了地址空间、异步事件和I／O等方面的阐述。

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GFP_ATOMIC

Used to allocate memory from interrupt handlers and other code outside of a process context. Never sleeps.

GFP_KERNEL

Normal allocation of kernel memory. May sleep.

struct gendisk is a dynamically allocated structure that requires special kernel

manipulation to be initialized; drivers cannot allocate the structure on their own.

Instead, you must call:

The minors argument should be the number of minor numbers this disk uses; note

that you cannot change the minors field later and expect things to work properly.

When a disk is no longer needed, it should be freed with:

A gendisk is a reference-counted structure (it contains a kobject). There are get_disk

and put_disk functions available to manipulate the reference count, but drivers

should never need to do that. Normally, the call to del_gendisk removes the final reference

to a gendisk, but there are no guarantees of that. Thus, it is possible that the

structure could continue to exist (and your methods could be called) after a call to

del_gendisk. If you delete the structure when there are no users (that is, after the final

release or in your module cleanup function), however, you can be sure that you will

not hear from it again.

Allocating a gendisk structure does not make the disk available to the system. To do

that, you must initialize the structure and call add_disk:

书籍介绍

本书揭示了如何给大多数的设备编写驱动程序的信息，这些信息迄今仅通过口头或者隐晦的源代码注释被共享。你不必是一个内核高手就可以理解并享受本书，所需要的只是C以及Unix系统调用方面的背景知识。在不需要特殊的硬件设备就能编译和运行的详细示例的指引下，你将学会如何给字符设备、块设备和网络接口编写驱动程序。PCI、USB和tty(终端)子系统都单列一章。本书为那些对操作系统的工作机制好奇的人提供了地址空间、异步事件和I／O等方面的阐述。