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RTOS Kernel Architecture

RTOS Kernel Architecture

For simpler applications, RTOS is usually a kernel but as complexity increases, various modules like networking protocol stacks debugging facilities, a device I/Os are includes in addition to the kernel.

RTOS architecture diagram

RTOS Kernel Architecture



k (A) Kernel, RTOS kernel acts as an abstraction layer between the hardware and the applications. There are three broad categories of kernels


(i) Monolithic kernel

Monolithic kernels are part of Unix-like operating systems like Linux, F FreeBSD, etc. A monolithic kernel is one single program that contains all nine of the code necessary to perform each kernel connected task. It runs all basic system services (i. e. process and memory management; interrupt handling and Input /Output communication, file system, etc) and provides powerful abstraction§ of the Underlying hardware. Amount of context switches and electronic communication concerned area unit greatly reduced that makes it runs quicker than microkernel.

(ii) Microkernel

It runs only basic process communication (messaging) and 1/0 control. It normally provides only minimal services such as managing memory protection, Interprocess communication, and process management. The other functions like running the hardware processes are not handled directly by microkernels. Thus, microkernels provide a smaller set of simple hardware abstractions. It is additional stable than monolithic because the kernel is unaffected even though the servers unsuccessful (i. e. file system). Microkernels are part of the operating systems like AIX, BeOS, Mach, Mac OS X, MINIX, and QNX. etc.

(iii) Hybrid Kernel

Hybrid kernels are extensions of microkernels with some properties of monolithic kernels. Hybrid kernels area unit is similar to’ microkernels, except that ' they include additional code in kernel space so that such code can run more swiftly than it would be it in user. space. These are a part of the operative systems like Microsoft Windows NGO, 2000 and XP DragonF 1y BSD, etc.


(iv) Exokernel

Exokernels provides efficient control over hardware. It runs only services protecting the resources (i.e. tracking the ownership, guarding the usage, revoking access to resources, etc) by providing a low-level interface for library operating systems and leaving the management to the application.


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