linux device drivers programming at kernel level

Introduction: from 2.4 to 2.6, the Linux kernel has greatly changed in terms of the module mechanism, device model, and some core APIs that can be loaded, device driver developers are faced with porting drivers from 2.4 to 2.6 kernels, or enabling

, process context, virtual memory, atomic operations, blocking, sleep, synchronization, and other concepts and their relationships.The use of these concepts and methods in device drivers is the biggest difference between Linux Device Drivers and single-chip

This article from http://www.ibm.com/developerworks/cn/linux/l-module26/ Level: elementary Ting Zhou (moting9@hotmail.com), software engineer February 09, 2006 From 2.4 to 2.6, the Linux kernel has changed greatly in terms of the module mechanism, device model, and some co

!Released on: February 1, February 09, 2006Level: elementaryAccess status: 3751 viewsSuggestion: 0 (add comments) 1. Get the kernel versionWhen the device driver needs to support different kernel versions at the same time, in the compilation phase, the kernel module needs to know the version of the currently used

1. Get the kernel version When the device driver needs to support different kernel versions at the same time, in the compilation phase, the kernel module needs to know the version of the currently used kernel source code to use the corresponding

Linux provides a set of functions to handle the PCI configuration block. Before a PCI device can be used, the Linux driver needs to determine the specific parameters of the device from the information in the PCI device configuration block, making the relevant settings so th

transfer2. If the DMA and CPU access the same memory simultaneously, the conflict is resolved by the hardware circuit called the memory arbiter.3, the most used is the disk drive and other need to transfer a large number of bytes of equipment.4, the DMA setting time is longer, a small amount of data use CPU more efficient5. The synchronization DMA is triggered by the process, such as playing movies, music, when playing music, the memory data with DMA to the sound card playback6, asynchronous DM

The driver can be compiled in two ways. One is to statically compile the program into the kernel, and the other is to compile the program into a module for dynamic loading. Because uClinux does not support dynamic module loading, and embedded Linux cannot use insmod/rmmod as flexibly as Desktop Linux does, so here we will only introduce how to statically compile

It may be difficult to put the driver model in the first chapter, but as long as the driver model can be crossed, it will be much easier later. The driver model is the cornerstone of the entire Linux Device Driver. Most people call the driver model a device model, but I have checked the help document of Linux to find t

contiguous and the corresponding data block on disk is also adjacent, then the general block layer can be merged with them, this way to produce a larger memory area is the physical segment.Common block Layer:1. The common block layer is a kernel component that handles requests from all block devices in the systemI\O Scheduler:1. Block device drivers can transmit

This article from the csdn blog, reproduced please indicate the source: http://blog.csdn.net/z2007b/archive/2011/05/19/6432997.aspx //************************************** *************** Linux Kernel Lecture Hall (1) cornerstone Driver Model for device drivers (6) In the previous section, we roughly analyzed how dri

); List_head (list); List_add (struct list_head *new, struct list_head *head); List_add_tail (struct list_head *new, struct list_head *head); List_del (struct list_head *entry); List_del_init (struct list_head *entry); List_move (struct list_head *entry, struct list_head *head); List_move_tail (struct list_head *entry, struct list_head *head); List_empty (struct list_head *head); List_splice (struct list_head *list, struct list_head *head);

_KTHREAD_H#define _KTHREAD_H#include Kthread. c #include Thread_drv.c #include Makefile # set to your kernel treeKERNEL = /usr/src/linux# get the linux architecture. Needed to find proper include file for CFLAGSARCH=$(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ -e s/arm.*/arm/ -e s/sa110/arm/)# set default flags to compile moduleCFLAGS = -D__KERNEL

How to use the device tree of linux drivers and how to use the device tree of linux drivers The Device Tree describes the hardware from the software perspective, and DTS is the

Control program.In addition, routing and address resolution are handled by the kernel. Loadable Modules The features provided by the Linux kernel can be extended at run time, that is, when the system is up and running, we can add or remove functionality from the kernel to the kernel.Code that can be adde

Linux Kernel programming (character device file)-General Linux technology-Linux programming and kernel information. The following is a detai

This article is done original, reproduced please specify the source, respect for the original.Writing this article, I refer to some blogs on the Internet:Http://bbs.chinaunix.net/thread-3634524-1-1.htmlHttp://www.bkjia.com/gjrj/800182.htmlAlso refer to the "Linux driver development in detail" 3.4 chapters, to achieve the establishment of their own drive directory.The driving example in this article is: Linux