Tài liệu Linux Device Drivers-Chapter 16 :Physical Layout of the Kernel Source ppt

... description of this mechanism at http://www .linux. it/kerneldocs/sysctl. ipc and lib Chapter 16 :Physical Layout of the Kernel Source So far, we've talked about the Linux kernel from the perspective ... through the source code and grepping your way through the source tree to uncover the relationships among the different parts of the kerne...

Ngày tải lên: 21/01/2014, 07:20

... Fortunately, the kernel makes a number of facilities available to ease the task of the driver writer. In the next few chapters we'll fill in information on some of the kernel resources that ... actually run (it calls the scheduler, which selects the same process, which calls the scheduler, which ). In other words, the load of the machine (the average...

Ngày tải lên: 24/12/2013, 01:17

... in the required registers, whereas the contents of the optional registers depend on the actual capabilities of the peripheral. The optional fields are not used unless the contents of the required ... to the last device that has been found, so that the search can continue instead of restarting from the head of the list. To find the first device, from...

Ngày tải lên: 21/01/2014, 07:20

... the interface between the hardware of the function device and the firmware running on the function device. All devices must support endpoint zero. This is the endpoint which receives all of the ... follows. The host will send the Setup token telling the function that the following packet is a Setup packet. The Address field will hold the address of the d...

Ngày tải lên: 13/12/2013, 00:15

... Test the MOTD display a. Exit the console session. Reenter the router to display the message -of- the- day. This is done by pressing the Enter key. This will display the message entered into the ... Message -of- the- Day (MOTD) Objective • Demonstrate the commands to enter a message -of- the- day (MOTD) on the router. This procedure allows all users to view the mes...

Ngày tải lên: 24/01/2014, 19:20

... Introduction to Device Drivers As the popularity of the Linux system continues to grow, the interest in writing Linux device drivers steadily increases. Most of Linux is independent of the hardware ... makes Linux drivers easy to write, to the point that there are now hundreds of them available. There are a number of reasons to be interested in the writi...

Ngày tải lên: 24/12/2013, 01:17

... when playing with the kernel sources, as most of the time you'll end up with several versions of the source tree. All of the sample modules accompanying this book use the KERNELDIR variable ... description of the internals applies only to versions 2.2 and 2.4 of the kernel; Linux 2.0 did the same job in a different way. The compiler will define the...

Ngày tải lên: 24/12/2013, 01:17

... four is the default in the scull sources. The last few lines of the script may seem obscure: why change the group and mode of a device? The reason is that the script must be run by the superuser, ... char *name); The arguments are the major number being released and the name of the associated device. The kernel compares the name to the registered na...

Ngày tải lên: 24/12/2013, 01:17

... displays the processor status at the time of the fault, including the contents of the CPU registers, the location of page descriptor tables, and other seemingly incomprehensible information. The ... return the number of bytes of data actually placed in the page buffer, just like the read implementation does for other files. Other output values are *eof and *st...

Ngày tải lên: 24/12/2013, 01:17

... represents. When copies of the device are created by the software driver, we call them virtual devices just as virtual consoles use a single physical tty device. Although this kind of access control ... jump directly to the next section. The /dev/scullpriv device node implements virtual devices within the scull package. The scullpriv implementation uses the minor n...

Ngày tải lên: 24/12/2013, 01:17