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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" scope="external"><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" scope="external"><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" scope="external"><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" scope="external"><linktext>Symbian OS Internals - Chapter 7 Memory

Model</linktext></link>

</related-links></concept>