Operating System Embedded: Difference between revisions

Revision as of 17:43, 7 April 2010

Revision as of 17:51, 7 April 2010

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The '''Operating System Embedded''' (mostly known under the [[acronym]] '''Enea OSE''') is a [[real-time operating system|real-time]] [[embedded operating system]] created by the [[Sweden|Swedish]] information technology company [[ENEA AB|ENEA]]. [[Bengt Eliasson]], who at the time was a consultant from ENEA with an assignment at [[Ericsson]], wrote the basic parts of the [[kernel (computer science)|kernel]]. The early version for the [[Zilog Z80]] processor was named OS80.

Enea OSE is one of the most widely used RTOS in world with over 1.5 billion run times deployed according to VisionMobile<ref>http://www.visionmobile.com/blog/2009/12/100-million-insights 100 million insights on mobile software</ref>. Enea OSE is shipped in hundreds of millions of mobile phones each year and over half of the world's 3G basestations<ref>http://www.enea.com/33494.epibrw Leader in Communications Software</ref>.

OSE uses [[Event (computing)|events]] (named ''[[Signal programming|signals]]'' due to ENEA's Telecomms background) in the form of messages passed to and from [[computer process|processes]] in the system. Messages are stored in a [[Queue (data structure)|queue]] attached to each process. A 'link handler' mechanism allows signals to be passed between processes on separate machines, over a variety of transports. The OSE signalling mechanism formed the basis of an [[Open source|open-source]] [[inter-processkernel design that combines the advantages of

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Enea OSE Multicore Edition was release in 2009 and is based on the same microkernel architecture. The kernel design that combines the advantages of both traditional Asymmetric Multiprocessing (AMP) and Symmetric Multiprocessing (SMP).

The hybrid AMP/SMP kernel in OSE Multicore Edition is based on a number of factors:

* Essential services in OSE are implemented according to a micro kernel model which allows IP stacks, file systems, application loaders, etc. to be located on different cores, while applications can access these services regardless of ___location in the system(___location transparency).

* A kernel that instantiates a separate scheduler on each core with associated data structures to preserve determinism and realtime characteristics.

* Essential services in OSE are implemented according to a micro kernel model which

allows IP stacks, file systems, application loaders, etc. to be located on different cores,

while applications can access these services regardless of ___location in the system

(___location transparency).

* User defined process migration and load balancing based on low intrusion mechanisms to measure CPU load on each core.

* A kernel that instantiates a separate scheduler on each core with associated data

structures to preserve determinism and realtime characteristics.

* A lightweight kernel internal IPC mechanism called kernel events used to perform asynchronous, cross core transactions in order to avoid the use of fine-granular locking designs, which has a detrimental effect on performance.

* User defined process migration and load balancing based on low intrusion mechanisms

to measure CPU load on each core.

VDC Research Group selected Enea OSE Multicore Edition Best of Show at ESC Boston 2009 <ref>[http://www.embedded.com/esc/220101008 Embeddie Winners Announced] </ref>

* A lightweight kernel internal IPC mechanism called kernel events used to perform

asynchronous, cross core transactions in order to avoid the use of fine-granular locking

designs, which has a detrimental effect on performance.

The system exists in several revisions named ''OSE'' for [[ARM architecture|ARM processors]], [[PowerPC]] and [[MIPS architecture|MIPS]], ''OSE_ck'' for various DSP's and ''OSE Epsilon'' for minimal devices(written 100% in assembly).