Kernel api reference documentation messages sorted by. The linux kernel module programming guide is a free book. The lectures focus on theoretical and linux kernel exploration. Generates reference manuals in html, latex, rtf, postscript, pdf, and man pages. Applications get a handle to a gem object through a driverspecific ioctl, and can use that handle to refer to the gem object in other standard or driverspecific ioctls. The linux programming interface published in october 2010, no starch press, isbn 9781593272203 is a detailed guide and reference for linux and unix system programming. The main cgroup controllers for resource management are cpu, memory, and blkio, see available controllers in red hat enterprise linux 7 for the list of controllers enabled by default. The device tree is used both by open firmware, and in the standalone flattened device tree fdt form. Linux gpu driver developers guide the linux kernel. The linux kernel api the linux kernel documentation. The userspace api manual gathers together documents describing aspects of the kernel interface as seen by application.
He is an ardent kernel enthusiast and expert, and has been closely following the linux kernel since the late 90s. There are two types of application programming interface api in the linux. You can also get changes from people modifying internal kernel apis. To build the documentation in html or pdf formats, use make htmldocs or make pdfdocs. This documentation outlines the linux kernel crypto api with its concepts, details about developing cipher implementations, employment of the api for cryptographic use cases, as well as programming examples. For reference entries that describe facilities for vxworks processbased application development, see the vxworks application api. This is the api implemented by linux and other unixlike operating systems. Kernel driver ucd9000 the linux kernel documentation. The linux kernel device driver docbook used to have a chapter with the media devices kabi. This is reference material that can help when reading the rest of this book, as you will probably encounter these two structures in almost every chapter. The linux kernel module programming guide lkmpg was originally written by ori pomerantz. To build the documentation in html or pdf formats, use make htmldocs or make.
You can build the kernel using gcc savetemps to generate. The linux programming interface published in october 2010, no starch press, isbn 9781593272203 is a detailed guide and reference for linux and unix system programming with 1552 pages, 115 diagrams, 88 tables, nearly 200 example programs, and over 200 exercises, tlpi is the most comprehensive description of linux and unix system programming available. The generated documentation is placed in documentationoutput the restructuredtext files may contain directives to include structured documentation comments, or kerneldoc comments. The internal kernel api to implement kernel code can undergo. Good to know its possible that multiple kernels are detected on a single linux host. Unix kernels provide an execution environment in which applications may run. The gnu c library reference manual sandra loosemore with richard m. Below we refer to the specific links for both apis in the api documentation. Peter jay salzman took over maintenance and updated it for the 2. Life got busy, and ori no longer had time or inclination to maintain the document. The labs focus on device drivers topics and they resemble howto style documentation. The focus of the development of the linux api has been to provide the usable features of the specifications defined in posix in a way.
The graphical user interface found on most linux desktops is provided by software called the x window system, which defines a device independent way of dealing with screens, keyboards and pointer devices x window defines a network protocol for communication, and any program that knows how to speak this protocol. Manual page section 2 provides more information about system calls. Understanding the linux kernel 1 preface in the spring semester of 1997, we taught a course on operating systems based on linux 2. The linux media subsystem documentation is grouped on 3 document sets. Booting the linuxppc kernel without open firmware in kernel source. The generated documentation is placed in documentationoutput. Therefore, the kernel must implement a set of services and corresponding interfaces. Drm memory management the linux kernel documentation. Linux kernel documentation the linux kernel archives.
Provides an api to register and implement device drivers here usb device drivers. Need for a device model for the same device, need to use the same device driver on multiple cpu architectures x86, arm, even though the hardware controllers are different. To achieve this, we assigned term projects consisting of making changes to the kernel and performing tests on the modified version. In linux the graphical user interface is not a part of the operating system. The linux kernel documentation intel open source technology. We call this work the architecture of the linux kernel and target commercial developers and potential participants in linux development. Contribute to rockchip linuxdocs development by creating an account on github. You will see that the linux kernel separates the hardware from userlevel tasks. Linux kernel teaching the linux kernel documentation. The linux kernel provides several interfaces to userspace applications that are used for different purposes and that have different properties by design. The sphinx c domain name c is suited for documentation of c api. After all, the linux kernel is a fast moving target. The linux driver implementers api guide the kernel offers a wide variety of interfaces to support the development of device drivers.
The linux kernel module programming guide was originally written for the 2. The process kernel model assumes that processes that require a kernel service use specific programming constructs called system calls. This document is an only somewhat organized collection of some of those interfaces it will hopefully get better over time. System call is the services provided by linux kernel.
Applications use those interfaces and do not usually interact directly with hardware resources. This is a helper function which defines a custom made named function as the kernel moduless entry point. This requires a clean organization of the code, with the device drivers separated from the controller drivers, the hardware. Eventually, ori no longer had time to maintain the document. This is the beginning of a manual for core kernel apis. Introduction to linux kernel driver programming linux foundation.
Youll notice the scan results report the running kernel on each linux host in information gathered qid 45097. Open power foundation linux on power architecture platform reference lopapr, v1. The ucd90124 is a 12rail pmbusi2c addressable powersupply sequencer and systemhealth monitor. The linux drm layer contains code intended to support the needs of complex graphics devices, usually containing programmable pipelines well suited to 3d graphics acceleration. The linux kernel devicetree maintainers are actively involved in the specification process. The linux kernel api reference there are a large number of api and helper functions available for a kernel developer. This topic and subtopics have been added to mydocs. Intel vtune amplifier xe 2011 for wind river linux 4. Dont hesitate to copy and paste commands from the pdf slides and labs. Assume, for example, that a user task controls a robotic arm. Each system call sets up the group of parameters that identifies the process request and then executes the hardwaredependent cpu instruction to switch from user mode to kernel mode. The linux kernel wikibooks, open books for an open world. To get an overview, use man 2 intro in a command shell. Documentationdocbook already provide the lowlevel api guides someday, and alessandro and others are already working on updates to their.
The kernel offers a wide variety of interfaces to support the development of device drivers. In c programming, it often uses functions defined in libc which provides a wrapper for many system calls. Stallman, roland mcgrath, andrew oram, and ulrich drepper for version 2. Contents section number title page chapter 1 introduction 1. The vxworks kernel api reference is a twovolume set that provides reference entries describing the facilities available in the vxworks kernel. It is composed out of the system call interface of the linux kernel and the subroutines in the gnu c library glibc. The linux api is the kerneluser space api, which allows programs in user space to access system resources and services of the linux kernel. With 1552 pages, 115 diagrams, 88 tables, nearly 200 example programs, and over 200 exercises, tlpi is the most comprehensive description of linux and unix system.
It became very popular as being the best free way to learn how to program linux kernel modules. This is a collection of lectures and labs linux kernel topics. The linux kernel a linux kernel api and internals reference. In this appendix i cover the two most fundamental data structures in the linux kernel networking stack. Core api documentation the linux kernel documentation. For detailed description of resource controllers and their configurable parameters, see controllerspecific kernel documentation. Graphics drivers in the kernel may make use of drm functions to make tasks like memory management, interrupt handling and dma easier, and provide a uniform interface to. Linux kernel and driver development training linux kernel bootlin. The linux kernel api this documentation is free software.
The linux kernel is responsible for creating and maintaining page tables but employs the cpus memory management unit mmu to translate the virtual memory accesses of a process into corresponding physical memory accesses. The devicetree specification will continue to be updated. Linux kernel map with main api functions and structures, pdf version. An overview of unix kernels linux kernel reference. The linux kernel uses sphinx to generate pretty documentation from. The linux driver implementers api guide linux kernel. We dont want another api book or one that reads you the source code. Linux kernel in a nutshell covers the entire range of kernel tasks, starting with downloading the source and making sure that the kernel is in sync with the versions of the tools you need.
The kernel has the ability to suspend any userlevel task, once that task has outrun the slice of time allotted to it by the cpu. The linux kernel graphical operations are in include linux fb. The idea was to encourage students to read the source code. In addition to configuration and installation steps, the book offers reference material and discussions of related topics such as control of kernel options. Using this function, we can define functions under any name as. Bootlin is often in the top 20 companies contributing to the linux kernel. Linux device drivers 3rd edition, 2005, by jonathan corbet, alessandro rubini, and greg kroahhartman, oreilly reference, online. Legacy video4linux api version 1 video4linux api version 1 is obsolete and not supported by the kernel anymore. The linux driver implementers api guide the linux kernel.
This way, you can share a reference configuration inside the kernel sources. The documentations for these functions are a bit rare. Eventually this is what addons like x11, wayland, or drm appear to reference. For programs with a simpler build system, you can use framac directly as you would a c compiler without relying on another compiler to provide preprocessed source files. Need for a single driver to support multiple devices of the same kind. The available bitmap operations and their rough meaning in the case that the bitmap is a single unsigned long are thus. For reference entries that describe facilities for vxworks processbased application development, see the vxworks application api reference. When unspecified, vulnerabilities are not filtered based on kernel activity. The linux kernel uses sphinx to generate pretty documentation from restructuredtext files under documentation. He is the founder of tech veda, which specializes in engineering and skilling services on the linux kernel, through technical support, kernel contributions, and advanced training. One per board to support in the linux kernel advantage. The api reference is a lexicographic list of all the different classes, methods and features that kivy offers. The linux kernel api reference linux developers group.
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