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Platform_get_resource man page

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That is, being able to read and write to the registers, and receiving its interrupts. The first operation is a sanity check, verifying that the probe was called on a device that is relevant. This is probably not really necessary, but this check appears in many drivers. The purpose is just to avoid clashes between two drivers accessing the same register space which should never happen anyhow. It makes sure that the physical memory segment has a virtual memory mapping, and returns the virtual address of the beginning of that segment.

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Linux Device Drivers, Second Edition by Jonathan Corbet, Alessandro Rubini

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To browse Academia. Skip to main content. Log In Sign Up. Peter Senna Tschudin. Senna lip6. Reveillere labri.

In this paper, we propose an alter- Our thesis is that the set of code fragments included in a nate view, based on the metaphor of a gene. Guided by this device driver is determined by the set of features provided by metaphor, we study the structure of Linux 3.

Furthermore, we posit that these features are reflected by the data struc- tures manipulated by the driver. Put another way, we view 1. Introduction the code fragments that make up a driver as being drawn Over the past 15 years, substantial attention has been paid from a set of genes that support the various possible fea- in the operating system OS community to the problem tures of a device.

A gene is a sequence of related, possibly of developing reliable device drivers. Proposed approaches noncontiguous code fragments that realize the functionality range from the use of domain-specific languages [12], to the relevant to a feature. We view the construction of a driver use of templates [2], to the generation of provably correct as the process of selecting, adapting, and, if needed, inter- drivers from specifications [15].

Nevertheless, Kadav and leaving these genes to achieve a desired effect. Thus, when Swift have pointed out that many of these approaches rely a driver developer copies some existing code, he replicates on assumptions that are not true for many classes of drivers, some genes and deletes others, that do not correspond to the and thus do not scale up to the complete range of devices features of the target device.

There is thus a need for a better understanding of the In this paper, we perform a preliminary investigation of structure of device drivers, and of the specific issues and this thesis. For this, we manually identify a part of the driver design decisions that go into their creation. In the context of this preliminary work, drivers are implemented by copy-paste programming.

In this our experiments focus on the probe functions of Linux eth- form of programming, a driver developer starts with driver ernet platform drivers from Linux 3. These functions are concerned with driver initializa- copy according to device-specific information. In order to tion. They are interesting for this work because they are understand this phenomenon, a number of studies have ap- affected by a wide range of device and machine features plied code clone detectors to Linux code [6, 10, 18].

How- and because they involve OS and support libraries that have ever, knowing the amount of duplicated code, as often re- evolved over time. Instead, of operations that can be viewed as genes. Copyrights for components of this work owned by others than ACM multiple coexisting ways to express the same behavior.

Abstracting with credit is permitted. Request permissions from permissions acm. The rest of this paper is organized as follows. Linux Platform Driver Probe Functions In Linux 3. The considered Linux 31 free netdev netdev ; 3. Figure 1. Genes Code Functions Clones 17 , 3 connecting the device to the net device support library in green, lines , , Gene Patches Fragments Instances call release mem region rather than release resource. Indeed, the possibility of bugs in the code increases the dif- ficulty of identifying genes automatically, and is one reason Figure 2.

Methodology: solid lines represent automatic why clone detection is not sufficient. For simplicity, in this preliminary work, we do not take these of each gene. These steps are summarized in Figure 2. Cur- functions into account. Studying the Driver Genome The steps in our methodology are as follows, starting from a set of Linux source code files. In Figure 2, the result To evaluate our thesis, we carry out a study in two parts. First, to find genes, we pass over the set of probe entry point functions, to identify common sequences of possibly disjoint Part 1: Gene identification code fragments, which we abstract into genes.

Then, to study gene dispersal, we pass over these functions again, now with 1. Identify and extract the probe entry points. For this, we the gene definitions, and count the number of occurrences use Coccinelle [14], to find declarations of platform - driver structures, and extract the definition of the func- 1 Lines of code were calculated using SLOCCount.

Identify clones in the probe entry point code. Our as- as the MDIO bus. We have not included these drivers in our study. For clone detection, we use Deckard3 [5], which platform get resource byname can find clones at any degree of granularity. Clone detectors report maximal recurring code pat- Generation 3 Generation 4 terns, regardless of their semantics. Thus, different parts of a clone may relate to different genes. Figure 3.

Evolution in the genome for mapping virtual 4. Manually collect the identified code fragments that real- memory ize a given functionality into genes. We typically identify a gene as a sequence of code fragments involving com- mon variables, but ad hoc knowledge of the semantics of graphs shown in Figure 3, obtains the range of physical ad- the OS and OS support functions is also required.

For conciseness, the graphs in Figure 3 describe the genes in terms of only 5. Create Coccinelle semantic patches pattern matching the names of the principal functions called, and not any pos- specifications that detect occurrences of the identified sible assignments, tests, and error-handling code. Cleanup genes. These semantic patches are designed to identify code, to be performed only in case an error is detected in the exact occurrences of the genes, as well as fragments of overall probe process is shown in brackets.

The variant con- code that may relate to a gene, but do not match the sisting of the left most path in the leftmost graph is the one gene exactly. This helps address the issue of bugs in gene found in our example in Figure 1. The upper leftmost graph in Figure 3 represents the origi- 6. Apply the semantic patches to the probe functions.

The developer can choose between platform - 7. Manually check and count gene instances among the get resource and platform get resource byname de- matched code fragments. Finally, request mem region is We have focused our evaluation on the genes illustrated by not always present. If it is omitted, the developer must have our example in Figure 1.

Other genes that we request mem region to reserve it. The remaining graphs have identified, but have not yet studied in detail, relate to show subsequent extensions to the genome. In a tain the physical addresses associated with the device, 2 re- few cases, a driver tries both platform get resource and serve these addresses, and 3 map these addresses into vir- platform get resource byname, but the rest of the code tual ones.

There are two families of these genes, depending is shared; we count these as two separate gene occurrences. Figure 1 is the most common, appearing in 15 files. Most One family of genes, illustrated by the paths in the directed of the other genes only appear in at most one or two probe entry points. Number of probe entry points containing the Generation 2: request only request only platform get resource-based genes for obtaining IRQs.

In other cases, however, these fields are used to these drivers. We leave further investigation of these cases platform get resource byname, but do not match any of to future work. In two cases, the rest of the gene is found in a helper function, which is out of scope of our current study. The braries. A few drivers, targeting the PowerPC architecture, obtain the Obtaining the interrupt number, however, is not sufficient physical address range using the function of address to - to initiate interrupt handling.

It is also necessary to invoke resource. These may then use e. Typically, this is done in another and ioremap, as in the platform get resource case, or driver entry point, but some drivers call this function in they may use only the function of iomap, which encapsu- the probe function.

We thus find that a single gene can lates both a call to of address to resource and a call affect multiple entry points, and the effect of a gene can be to ioremap the physical address range is not reserved in distributed across the diverse entry points in different ways.

A final variant is of ioremap, which is not Figure 5 shows the number of probe entry points us- used with of address to resource, and which either pro- ing the various genes. Three probe entry points explicitly use rarely. Furthermore, there are few probe entry points that of address to resource and ioremap, of which two also call request irq. Three probe entry points use of iomap alone, while two use of ioremap.

Part of our thesis is that In order to register a network device with the kernel, a the gene instances found in a driver are determined in part network driver creates a net device structure, initializes by the data structures manipulated by the driver. This leads to three ba- a code base nor do they consider compositions of protocols sic genes.

Spear et al. Their declarations are primar- The three basic genes come in a number of variants, de- ily intended for verification, but also trigger the generation pending on which fields of the net device structure are ad- of boilerplate code targeting a high-level resource acquisi- ditionally initialized.

In this case, we consider the initializa- tion interface. While this work shares with our work a focus tion to be part of the device registration gene, but the compu- on resources, it does not target legacy interfaces, provide an tation of these values to be separate, whether part of another explanation of legacy code, or address the interleaving of re- gene or device-specific code.

Fields that can be initialized source acquisitions and device-specific operations. Termite specifications are concerned with input- number cf. Nevertheless, we can view the mon across driver implementations. RevNic proposes to port inclusion of the device registration gene as being motivated drivers based on templates and device-specific values ob- by the presence of a local variable of type net device in tained from executing a driver for the same device but a dif- the definition of the probe entry point.

Templates must be written manually.

CentOS Version 6.3 Man Pages Online

They are installed into section 9 of the manual. As the files containing manual pages for different kernel versions are installed in the same location, only one linux-manual package may be installed at a time. The linux-doc package containing the documentation in other formats is free from such restriction. MX Linux mx

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The first parameter tells the function which device we are interested in, so it can extract the info we need.

I am part of a team working on a product containing an AD Due to the nature of the project and our customers we are locked in to using Xilinx Petalinux currently We are having some trouble figuring out how to integrate the Analog Devices iio drivers into the Petalinux Kernel. We would like some assistance in figuring out which new files and file changes we need to incorporate into our Petalinux, and any additional guidance you can provide in integrating the AD into our environment. We will also be trying to integrate libiio with the goal of getting gnuradio running on the system.

Kernel Platform_get_resource () function parsing

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The platform device API

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. In the new world featuring a device tree, my node for the watchdog is located in the domain of internal CPU registers and I can access them without problems. But how do I add my memory location in RAM?

Summary point

The primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! By Jonathan Corbet June 21, In the very early days, Linux users often had to tell the kernel where specific devices were to be found before their systems would work. Happily, we now live in the days of busses like PCI which have discoverability built into them; any device sitting on a PCI bus can tell the system what sort of device it is and where its resources are.

Re: [PATCH 08/10] net: fjes: Handle return value of platform_get_irq and platform_get_resource

All will be explained in due time young padawan. If you create a compressed. The custom LED component placed inside the Qsys system is shown below:.

As a programmer, you are already accustomed to managing memory allocation; writing kernel code is no different in this regard. Your program obtains a memory area using kmalloc and releases it using kfree. These functions behave like malloc and free , except that kmalloc takes an additional argument, the priority. After all, it is possible for a kernel module to simply access these resources without telling the operating system about it. For instance, a driver needs to be able to allocate the exact ports it needs, not just some ports. But drivers cannot just go about making use of these system resources without first ensuring that they are not already in use elsewhere.

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Atomically subtracts i from v and returns true if the result is zero, or false for all other cases. Atomically decrements v by 1 and returns true if the result is 0, or false for all other cases. Atomically increments v by 1 and returns true if the result is zero, or false for all other cases. Atomically adds i to v and returns true if the result is negative, or false when result is greater than or equal to zero. Atomically subtracts i from v and returns v - i. Atomically adds a to v , so long as v was not already u. Returns the old value of v.

Nov 3, - Institutional Knowledge at Singapore Management University · Research res = platform get resource(pdev, IORESOURCE MEM, 0);. PS Tschudin - ‎ - ‎Cited by 1 - ‎Related articles.

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linux-manual-4.2 - Linux kernel API manual pages for version 4.2

Simple interfaces attached to a subsystem. Multiple interfaces can attach to a subsystem and its devices. Unlike drivers, they do not exclusively claim or control devices. Per-cpu memory allocated with this function is automatically freed on driver detach.

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