computer science

Uniform Driver Interface

Uniform Driver Interface is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Uniform Driver Interface rather than just read about it. In short: The Uniform Driver Interface (UDI) is a defunct project developed by several companies to define a portable interface for device drivers. The Uniform Driver Interface (UDI) allowed device drivers to be portable across both hardware platforms and operating systems without any changes to the driver source.

Key takeaways

Uniform Driver Interface belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Uniform Driver Interface to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Uniform Driver Interface from memory before moving on to harder problems.

Reference excerpt

The Uniform Driver Interface (UDI) is a defunct project developed by several companies to define a portable interface for device drivers. The Uniform Driver Interface (UDI) allowed device drivers to be portable across both hardware platforms and operating systems without any changes to the driver source. With the participation of multiple OS, platform and device hardware vendors, UDI was intended to be the first interface which was likely to achieve such portability on a wide scale. UDI provided an encapsulating environment for drivers with well-defined interfaces which isolated drivers from OS policies and from platform and I/O bus dependencies. In principle, this allowed driver development to be totally independent of OS development. In addition, the UDI architecture was intended to insulate drivers from platform specifics such as byte-ordering, DMA implications, multi-processing, interrupt implementations and I/O bus topologies. While UDI could potentially benefit open source operating systems such as Linux and *BSD by providing more driver support from companies, some open source/free software advocates feared that UDI would cause a proliferation of closed source drivers and a reduction in open source support by companies, undermining the purpose of the free software and open source movements. Richard Stallman (the leader of the free software movement) has claimed that the project does not benefit the free software movement.

See also I2O Network Driver Interface Specification (NDIS) Open Data-Link Interface (ODI) Universal Network Device Interface (UNDI) PC/TCP Packet Driver

References "UDI Reference Implementation Open Sourced" (Press release). Software Technologies Group. 2001-05-09. Archived from the original on 2001-11-09.{{cite press release}}: CS1 maint: bot: original URL status unknown (link)

External links Project UDI (Project UDI home page, loaded in a frameset by the official project URL www.projectudi.org) Official UDI Specifications (official UDI specifications published by Project UDI) UDI Driver Writer's Guide (PDF) (documentation from Project UDI, also here in HTML format) UDI and I2O (statement from Project UDI about I2O) UDI Reference Implementation (official UDI reference implementation published by Project UDI) The Free Software Movement and UDI (essay written by Richard Stallman in 1998, opposing UDI on philosophical grounds) Leading items (LWN.net article from 1998 about UDI and Linux) The Linux Kernel Driver Interface (explanation written by Greg Kroah-Hartman in 2004 about why Linux doesn't have stable internal APIs, also here in Linux kernel tree) We should all be supporting Project UDI. (editorial written by Deven Corzine in 2005 in support of Project UDI) The Uniform Driver Interface—why wasn’t it adopted? (blog post written in 2010 by Michael Trausch) Uniform Driver Interface (UDI wiki page on OSDev.org for hobbyists interested in implementing UDI) Acess2 Hobby Operating System (hobbyist OS with UDI support)

Worked examples

Example 1 — a first encounter with Uniform Driver Interface

Start with the simplest possible case. Write down what Uniform Driver Interface claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Uniform Driver Interface before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Uniform Driver Interface ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Uniform Driver Interface

In research: Uniform Driver Interface appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Uniform Driver Interface in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Uniform Driver Interface is common in secondary-school and first-year university syllabi. It links to neighbouring topics Device drivers, Software engineering stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Uniform Driver Interface outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Uniform Driver Interface in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Uniform Driver Interface means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Uniform Driver Interface out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Uniform Driver Interface in simple terms?

Why does Uniform Driver Interface matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Uniform Driver Interface?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Uniform Driver Interface.