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<concept id="GUID-857F981E-711B-5CA8-AB37-5C700A6140FA" xml:lang="en"><title>HAL Groups

and Handlers</title><shortdesc> List of HAL groups and the location of their associated handlers. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>Some of the handlers are part of Symbian platform generic code and do not

require porting.</p>

<table id="GUID-EE794194-6D85-5EBB-89AE-C7725B637E9F">

<tgroup cols="4"><colspec colname="col0"/><colspec colname="col1"/><colspec colname="col2"/><colspec colname="col3"/>

<tbody>

<row>

<entry><p> <b>HAL group</b>  </p> </entry>

<entry><p> <b>Location</b>  </p> </entry>

<entry><p> <b>Customizable?</b>  </p> </entry>

<entry><p> <b>Explicit registration required?</b>  </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-D60C5503-A176-354A-A655-22BE371178AE.dita"><apiname>EHalGroupVariant</apiname></xref>  </p> </entry>

<entry><p>Variant </p> </entry>

<entry><p>Yes. It needs to be implemented as the <xref href="GUID-A83A7C3C-7DC0-3B9C-842F-70FCC751365D.dita#GUID-A83A7C3C-7DC0-3B9C-842F-70FCC751365D/GUID-825726CE-F200-3E26-B2F2-4C756BB45B1B"><apiname>Asic::VariantHal()</apiname></xref> function

defined by the <xref href="GUID-A83A7C3C-7DC0-3B9C-842F-70FCC751365D.dita"><apiname>Asic</apiname></xref> class. </p> <p>See the template port: <filepath>...\template\template_variant\specific\variant.cpp</filepath>  </p> </entry>

<entry><p>No. It is done automatically as part of the kernel initialization. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-FB85CE22-DDFF-37E6-A6CE-7F70A994D371.dita"><apiname>EHalGroupPower</apiname></xref>  </p> </entry>

<entry><p>Power model </p> </entry>

<entry><p>Yes. It needs to be implemented when implementing the power model. </p> <p>See

the template port: <filepath>...\template\template_variant\specific\power.cpp</filepath>  </p> </entry>

<entry><p>No. It is done automatically as part of the kernel initialization. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-7F299BFC-D8A5-3A5A-B8DA-39BF42C99DC6.dita"><apiname>EHalGroupDisplay</apiname></xref>  </p> </entry>

<entry><p>LCD driver </p> </entry>

<entry><p>Yes, when porting the LCD driver. </p> <p>See the template port: <filepath>...\template\template_variant\specific\lcd.cpp</filepath>. </p> </entry>

<entry><p>Yes, during initialization of the driver. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-E22F7F41-C578-36B4-A7AB-AE0AEF520A69.dita"><apiname>EHalGroupDigitiser</apiname></xref>  </p> </entry>

<entry><p>Digitiser </p> </entry>

<entry><p>Yes, when porting the digitiser. </p> <p>See the template port: <filepath>...\template\template_variant\specific\xyin.cpp</filepath>. </p> </entry>

<entry><p>Yes, during initialization of the driver. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-7B4133F2-3BDC-3388-AC63-CD0EC6F73917.dita"><apiname>EHalGroupKeyboard</apiname></xref>  </p> </entry>

<entry><p>Keyboard driver </p> </entry>

<entry><p>Yes, when porting the keyboard driver. </p> <p>See the template

port: <filepath>...\template\template_variant\specific\keyboard.cpp</filepath>. </p> </entry>

<entry><p>Yes, during initialization of the driver. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-F10DCE1F-756C-318D-B0D1-8C8F5255959E.dita"><apiname>EHalGroupKernel</apiname></xref>  </p> </entry>

<entry><p>Kernel </p> </entry>

<entry><p>No. It is part of Symbian platform generic code. </p> </entry>

<entry><p>No. It is done automatically as part of the kernel initialization. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-48EEA57D-56A8-3C5E-8DF0-75C051D86EAE.dita"><apiname>EHalGroupMedia</apiname></xref>  </p> </entry>

<entry><p>Media Driver </p> </entry>

<entry><p>No. This is in the media driver LDD; this is a kernel extension

and is implemented by Symbian platform. </p> </entry>

<entry><p>Yes, during initialization of the driver/extension. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-B510C3F5-E11A-3107-B972-7FDEDB445BBA.dita"><apiname>EHalGroupEmulator</apiname></xref>  </p> </entry>

<entry><p>Emulator </p> </entry>

<entry><p>No. The emulator is a port of Symbian platform maintained by Symbian. </p> </entry>

<entry><p>Yes, during 3rd phase initialization of the emulator variant. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-E0A646D1-9EF3-30E3-BB91-11318C0DEC47.dita"><apiname>EHalGroupSound</apiname></xref>  </p> </entry>

<entry><p>Sound driver </p> </entry>

<entry><p>Unlikely—the only example is in the sound driver maintained for

backwards compatibility with pre-Symbian hardware. </p> </entry>

<entry><p>Yes </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-537AA230-18EF-3CDC-B708-CF3BE13AF34A.dita"><apiname>EHalGroupMouse</apiname></xref>  </p> </entry>

<entry><p>Emulator </p> </entry>

<entry><p>Unlikely—the only example is in the emulator, which is a port of

Symbian platform maintained by Symbian. </p> </entry>

<entry><p>Yes </p> </entry>

</row>

</tbody>

</tgroup>