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Tài liệu Linux IO Port Programming pptx

... Linux 2.x kernels have soft real time support; see the manual page for sched_setscheduler(2) for details There is a special kernel that supports hard real time; see http://luz.cs.nmt.edu/~rtlinux/ ... document describes programming hardware I/O ports and waiting for small periods of time in user−mode Linux programs running on the Intel x86 architecture. 1 Introduction 2 Using I/O ports in C programs ... document describes programming hardware I/O ports and waiting for small periods of time in user−mode Linux programs running on the Intel x86 architecture This document is a descendant of the very small

Ngày tải lên: 22/12/2013, 10:15

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Tài liệu Linux Device Drivers-Chapter 2 : Building and Running Modules pptx

... include/linux and include/asm inside the kernel sources (usually found in /usr/src/linux) Older distributions (based on libc version 5 or earlier) used to carry symbolic links from /usr/include/linuxand ... article at http://www.linux.it/kerneldocs/kconf that should help you get started root# gcc -c hello.c root# insmod /hello.o Hello, world root# rmmod hello Goodbye cruel world between Linux distributions) ... Moreover, of course, Linux can run on symmetric multiprocessor (SMP) systems, with the result that your driver could be executing concurrently on more than one CPU As a result, Linux kernel code,

Ngày tải lên: 24/12/2013, 01:17

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Tài liệu Linux Device Drivers-Chapter 3: Char Drivers docx

... Anyone can compile and run scull, and scull is portable across the computer architectures on which Linux runs On the other hand, the device doesn't do anything "useful" other than demonstrating ... should be made at driver (module) initialization by calling the following function, defined in <linux/fs.h>: int register_chrdev(unsigned int major, const char *name, struct file_operations ... it tries to access invalid addresses.[17] [17]The word oops is used as both a noun and a verb by Linux enthusiasts When you unload the driver without unregistering the major number, recovery will

Ngày tải lên: 24/12/2013, 01:17

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Tài liệu Linux Device Drivers-Chapter 6 : Flow of Time pptx

... according to the value of HZ, which is an architecture-dependent value defined in <linux/param.h> Current Linux versions define HZ to be 100 for most platforms, but some platforms use 1024, ... available in Linux 2.0, sysdep.h fills the gap Task Queues One feature many drivers need is the ability to schedule execution of some tasks at a later time without resorting to interrupts Linux offers ... value of HZ for those who want systems with a different clock interrupt frequency Some people using Linux for hard real-time tasks have been known to raise the value of HZ to get better response times;

Ngày tải lên: 24/12/2013, 01:17

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Tài liệu Linux Device Drivers-Chapter 7 : Getting Hold of Memory doc

... justifies using a lookaside cache, but there can be exceptions; the USB and ISDN drivers in Linux 2.4 use caches Linux memory caches have a type of kmem_cache_t and are created with Trang 8 void (*constructor)(void ... internal details of memory management in this chapter, but will defer it to "Memory Management in Linux" in Chapter 13, "mmap and DMA" The Real Story of kmalloc The kmalloc allocation ... GFP_ATOMIC, although those two cover most of the needs of device drivers All the flags are defined in <linux/mm.h>: individual flags are prefixed with a double underscore, like GFP_DMA; collections

Ngày tải lên: 24/12/2013, 01:17

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Tài liệu Linux Device Drivers-Chapter 8 :Hardware Management docx

... hardware (or Trang 5to another processor) in a particular order Linux provides four macros to cover all possible ordering needs #include <linux/kernel.h> void barrier(void) This function tells ... picture by showing you how a driver can access I/O ports and I/O memory while being portable across Linux platforms This chapter continues in the tradition of staying as independent of specific hardware ... latter solution is only common within tiny processors meant for embedded use For the same reason, Linux implements the concept of I/O ports on all computer platforms it runs on, even on platforms

Ngày tải lên: 24/12/2013, 01:17

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Tài liệu Linux Commands doc

... Định hướng dữ liệu xuất ra file • < Định hướng dữ liệu nhập từ file • >> Định hướng dữ liệu xuất ra cuối file nếu file đã tồn tại • | Định hướng dữ liệu xuất là dữ liệu nhập cho lệnh ... bill Trang 18Quản lý user và group• Xóa tài khoản người dùng – Câu lệnh: deluser hay userdel – Xóa tài khoản thì có thể dùng cách sau: • 1 Xóa bỏ dòng có chứa tài khoản trong tập tin /etc/passwd ... scanner::52:yvonne • Thêm một tài khoản vào nhóm – Mỗi tài khoản trên một dòng trong tập tin /etc/group, được phân cách bởi dấu phẩy – Theo lý thuyết không có hạn chế về số tài khoản trong một nhóm

Ngày tải lên: 19/01/2014, 19:20

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Tài liệu Linux Device Drivers-Chapter 11 : kmod and Advanced docx

... loading is the Advanced Linux Sound Architecture (ALSA) sound driver suite, which should (someday) replace the current sound implementation (Open Sound System, or OSS) in the Linux kernel.[42] ALSA ... and to allow the creation of "generic'' kernels that can support a wide variety of hardware, Linux offers support for automatic loading and unloading of modules To exploit this feature, you ... been simplified by not requiring the separate process context To use kmod, you must include <linux/kmod.h> in your driver source To request the loading of a module, call request_module: