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<concept id="GUID-A91C6359-E547-51AD-AA8C-45BCAFBA98AC" xml:lang="en"><title>Kernel Architecture

(EKA2)</title><shortdesc>EKA2 is the principal Hardware and Kernel Services module. It manages

the CPU and memory resources of a phone, and provides an architecture for

device drivers to manage other hardware resources. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p id="GUID-B66850E3-11C9-58D6-ADB3-12ABBC1B792C"> The Kernel has a layered

architecture so that it can be ported to different hardware. All base ports

must implement a layer called the ASSP/Variant that provides essential hardware-specific

services for the Kernel. </p>

<p>The Kernel also allows additional layers called personality layers to be

created that provide emulations of traditional real time operating systems.

This allows applications that were written for those operating systems to

be run on Symbian platform. </p>

<p>The device driver architecture and the services that the Kernel provides

to device drivers are described in the <xref href="GUID-0437DB4C-FC4E-51DC-BB4C-95C0B26834F5.dita">Device

Driver Guide</xref>. </p>

</conbody><related-links>

<link href="GUID-77DF7A6B-F01D-5B9F-9C7A-662A04ED8BE7.dita"><linktext>ASSP   Kernel

Extension Overview</linktext></link>

<link href="GUID-0437DB4C-FC4E-51DC-BB4C-95C0B26834F5.dita"><linktext>Device  

Driver Guide</linktext></link>

<link href="GUID-C06CFF3E-23E9-5E0B-99A1-51B8ED95465F.dita"><linktext>USB Client

  Driver</linktext></link>

<link href="http://developer.symbian.org/wiki/index.php/Symbian_OS_Internals/1._Introducing_EKA2.dita">

<linktext>Symbian OS Internals - Chapter 1 Introducing EKA2</linktext></link>

<link href="http://developer.symbian.org/wiki/index.php/Symbian_OS_Internals/2._Hardware_for_Symbian_OS.dita">

<linktext>Symbian OS Internals - Chapter 2 Hardware for Symbian OS</linktext>

</link>

<link href="http://developer.symbian.org/wiki/index.php/Symbian_OS_Internals/5._Kernel_Services.dita">

<linktext>Symbian OS Internals - Chapter 5 Kernel Services</linktext></link>

<link href="http://developer.symbian.org/wiki/index.php/Symbian_OS_Internals/7._Memory_Models.dita">

<linktext>Symbian OS Internals - Chapter 7 Memory Model</linktext></link>

</related-links></concept>