linux driver development book

calls at once and pass the generic block layer i/ o Scheduling for better performance, users can also reduce excessive synchronization load for network devices, you can also use AIO at the socket level, allowing the CPU and NIC to be fully overlapped to improve throughput performance System calls to kernel AIO that are typically combined with Libaio in user space io_setup( )//Initializes an asynchronous context for the current processio_submit( )//Submits one or more asynchron

and information stored in the directory item. Ii. build and run the module 1: Kernel items: including functions, variables, header files, and macros. 2:Module. hThe file contains a large number of functions and symbol definitions required to load the module.Init. hInitialize and clear functions 3: Module initialization function: registers any function provided by the module. The function should be declared as static because it is not visible outside of a specific file. 4: If a module does not d

1. Learn to write simple makefile 2. Compile an application and run it with makefile. 3. Learn to write the driver makefile 4. Write a simple char driver. The makefile is compiled and can be insmod, lsmod, or rmmod. Print Hello world in the init function of the driver. After insmod, you should be able to see the output through dmesg. 5. Write a complete

1. Learn to write simple makefile 2. Compile an applicationProgramCan be run with makefile 3. Learn to write the driver makefile 4. Write a simple char driver. The makefile is compiled and can be insmod, lsmod, or rmmod. Print Hello world in the init function of the driver. After insmod, you should be able to see the output through dmesg. 5. Write a complete

1. Learn to write simple makefile 2. Compile an applicationProgramCan be run with makefile 3. Learn to write the driver makefile 4. Write a simple char driver. The makefile is compiled and can be insmod, lsmod, or rmmod. Print Hello world in the init function of the driver. After insmod, you should be able to see the output through dmesg. 5. Write a c

1. Learn to write simple makefile 2. Compile an application and run it with makefile. 3. Learn to write the driver makefile 4. Write a simple char driver. The makefile is compiled and can be insmod, lsmod, or rmmod. Print Hello world in the init function of the driver. After insmod, you should be able to see the output through dmesg. 5. Write a complete

1. Learn to write simple makefile 2. Compile an applicationProgramCan be run with makefile 3. Learn to write the driver makefile 4. Write a simple char driver. The makefile is compiled and can be insmod, lsmod, or rmmod. Print Hello world in the init function of the driver. After insmod, you should be able to see the output through dmesg. 5. Write a complete

Recently learning to drive development, progress to the character device-driven development phase.First of all, the first reading of a learning-driven step of the post is recorded as follows:1. Learn to write simple makefile2. Compile an application that can run with makefile3. Learn to write driven makefile4. Write a simple char drive, makefile compile through, can Insmod, Lsmod, Rmmod. Print Hello World i

This blog updates the latest developments in Linux device driver development (version 3rd) in real time. At present, Chapter 4-9 has been initially completed on April 30, 2nd. Compared with version, these chapters are mainly changed. [F] indicates correction or upgrade; [N] indicates new knowledge points; [D] indicates deleted content.Chapter 4

between kernel space and user-space data:Copy_to_user need to detect the legitimacy of the pointer at each copy, that is, the user space pointer to the address is indeed a part of the process itself address, rather than point to the place does not belong to it, and each time the data is copied, frequent access to memory, due to the virtual address continuous, Physical addresses are not necessarily contiguous, causing the CPU cache to fail frequently, thus slowing down the speed.In the system fu

configures the device, and the hub driver is responsible for the enumeration process .The enumeration process is mainly divided into the following steps:STEP1: The root hub reports a change in the port current caused by the insertion device, and after the hub driver detects this state change, wakes up the KHUBD thread.The STEP2:KHUBD identifies the port on which the current changes.STEP3:KHUBD by sending c

may automatically download the binary files, if not copied into it)Note: For copying files You can copy them to your personal directory using SSH service software such as WINSCP, and move them to the destination folder using the command. Two check driveCheck that the driver is not loaded, and that the driver installation is successful if you have the following information.[Email protected]:~$ lsmod |

/** * Author:hasen * Reference: Linux device Driver Development Details * Introduction: Android Small rookie Linux * device Driver Development Learning Journey * Topic: asynchronous I/O * date:2014-11-11 */The most common

1. Driver Development OverviewDrive Classification:1. General classification: Character device, block device, network device character device: is a kind of device that is accessed by byte, character driver is responsible for driving character device, so the driver usually realizes system call such as Open,close,read, s

Although there are already many introductions on the Linux driver development environment on the Internet, as a newbie who has just been involved in the Linux driver, all the things have to be done by yourself, it usually takes a lot of time if the configuration is incorrect

/** * Author:hasen * Reference: Linux device Driver Development Details * Introduction: Android Small rookie Linux * device driver Development Learning Journey * Topic: blocking and non-blocking I/o * date:2014-11-05 * * Blocking

Just now, I was very excited about making scull and immediately used it. I wanted to summarize it and write an article. I didn't find a very good article occasionally, So I reprinted it, I am so lazy that I don't want to write it myself, hey. By:Wu Yin 1. Preface: A. Please read my article before proceeding to the following workCompile a kernel module that can be loaded under Linux 2.6 kernelConfigure the

First, write in front:Qualified Linux driver engineers need to meet the following conditions, the goal of this article is to present these conditions to the reader1, have a certain hardware foundation, understand Sram,flash,sdram, disk read and write way, understand UART,IIC,USB and other device interface, understand the polling, interrupt, DMA principle, the working mode of PCI bus and CPU memory Managemen

function in the block_device_operations structure that does not actually read or write data, in block I/O subsystem, these operations are handled by the request function. 6, request, and bio structuresstructRequest {structList_head queuelist;/*Request Chain List*/ structList_head donelist; request_queue_t*q;/*request belongs to queue*/unsignedintCmd_flags; enumrq_cmd_type_bits Cmd_type; sector_t sector; /*Current Sector*/sector_t Hard_sector; /*the next sector to transfer*/unsign

Itop-imx6ul Development Board watchdog test routines,the watchdog driver for the Itop-imx6ul Development Board is configured by default and can be used directly with test routines.version V1.1:1, format modification, 2, the routine modification perfect, which increases the feeding dog code.1 Watchdog Core driverThe watchdog d