linux device drivers programming at kernel level

Linux Kernel programming (startup parameters)-General Linux technology-Linux programming and kernel information. The following is a detailed description. 6. startup parameters In many p

. Start the terminal40. Enter the pathwatermark/2/text/ahr0cdovl2jsb2cuy3nkbi5uzxqvaxrjyxn0y3bw/font/5a6l5l2t/fontsize/400/fill/i0jbqkfcma==/ Dissolve/70/gravity/southeast "/>41. Compile and run42. Write a C + + code 1,CC43. Print statements, C + +44. Print out the results45. Drive HelloWorld#include #include Module_license ("Dual BSD/GPL");//Follow the Linux protocolstatic int hello_init (void){PRINTK (Kern_alert "Hello, world\n");//Print driver info

Linux Kernel module programming-Symmetric Multi-processing-general Linux technology-Linux programming and kernel information. The following is a detailed description. The simplest way t

Asynchronous notification for Linux Device Driver Programming The combination of blocking and non-blocking access and poll functions can better solve the reading and writing of devices, but it is more convenient if asynchronous notifications are provided. Asynchronous notification means that once the device is ready, t

compiles the application recommend the sameCompiling the application directive: Arm-none-linux-gnueabi-gcc-o Invoke_hello INVOKE_HELLO.CModify permission directive: chmod 777 Invoke_hello#include #include#include#include#include#includevoidMain () {intFD; Char*hello_node ="/dev/hello_device_node"; FD= Open (Hello_node, o_rdwr|o_ndelay); if(FD 0) {printf ("APP---->can ' t open \ "%s\" \ n", Hello_node); }Else{printf ("APP--->open \ "%s\" successfully\

->tx_packets =packets; returnstats; }structNet_device_ops Loopback_ops ={. Ndo_start_xmit=loopback_xmit,. Ndo_get_stats=Loopback_get_stats,};void StaticLoopback_setup (structNet_device *Dev) { //2. Net_dev Initialization ParametersDEV-GT;MTU = ( -*1024x768)+ -+ -+ A; Dev->flags =Iff_loopback; Dev->header_ops = Eth_header_ops; Dev->netdev_ops = Loopback_ops; }/*Setup and register the loopback device.*/Static__net_initintLoopback_net_init (structNET

/**kernel:linux2.6.32.63*file:\scripts \mod\modpost.h\scripts\mod\ modpost.c*author:davidlin* date:2014-12-25pm*email :[emailprotected]or[emailprotected] *world:thecityofSZ,inChina *Ver:000.000.001 *history:editor timedo *NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;1) linpeng 2014-12-25createdthisfile! NBSP;NBSP;*NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;2) *//*modpost.h*/#define nofail (PTR) do_nofail ( PTR), #ptr) void*do_nofail (void*ptr,constchar*expr);/*end ofmodpost.h*//*mod

Three. Deep analysis of network subsystemThe user program sends this network packet over the networkPassSciProtocol-Independent InterfacesProtocol stack the implementation of UDP chooses the routeThe implementation of IP will establish this neighbor subsystem and establish the neighbor informationDevice-Independent interfacesDrivenfunction call relationship (corresponds to above)Socket_file_opsDo_sock_write_sock_sendmsg(SCI interface)　　　　　　Udp_sendmsg (Routing Ip_route_output_flow)Udp_push_pendi

the clock interrupt is generated periodically by the system timer hardware, which is set by the kernel pattern Hz, which is an architecture-related constant. in file The current Linux version for most platform-defined Hz is 100, and on some platforms it is 1024. Try to count the platform-independent Hz values in the kernel code.When the clock breaks, the value o

I wrote several Linux kernel modules, but every time I wrote the code in a source file, I tried to write it in two. c files last time, and the result was not compiled. In desperation, rename one of the. c files to a. h file, and include the file to another file. However, it is strange to Write Functions in the. h file. Today, I checked the following kbuild documents, which are described as follows: If a

The first Linux kernel programming-general Linux technology-Linux programming and kernel information. The following is a detailed description. 1. Establish a

Four. DM9000 Network card driver Depth analysis1. Initialization of the DM9000Dm9000_init (){1. Assigning Net_device Structures2. Get the address break number from the Platform_device3. Map the acquired address to the virtual address operation function Io_remp ()4. Read the chip type5. Set the number of operating functions6. Register the network card driver register}2. Dm9000_open (){1. Ifconfig eth0 up}3. Dm9000_xmit (){1. Notify the Protocol line, pause the function that transmits data to driv

Linux Kernel programming (blocking process)-General Linux technology-Linux programming and kernel information. The following is a detailed description. What if someone asks you to do wh

Use the Linux kernel linked list, hlist macro definition, and operations in user space programming. List_head and hlist_head/hlist_node in Linux kernel are two important linked list construction tools that concatenate data structures into linked lists. Using their correspon

Article title: Linux kernel programming style. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open sour