--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Adaptation/GUID-8FA1B2B0-5842-4D5D-BD61-C2D79B56ADC6.dita	Fri Oct 15 14:32:18 2010 +0100
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-8FA1B2B0-5842-4D5D-BD61-C2D79B56ADC6" xml:lang="en"><title>Interrupt Service Routine (ISR)</title><shortdesc>This document describes interrupt service routines as used by device
+drivers.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>An ISR is a static function that will be executed when an interrupt occurs
+on the interrupt source bound to the ISR. </p>
+<codeblock id="GUID-E8416619-9314-5420-8EC1-F8BF804230DF" xml:space="preserve">// Interrupt service routines
+static void UartIsr(TAny* aParam);
+</codeblock>
+<p>An ISR performs the actions necessary to service the event of the peripheral
+that generated the interrupt and to remove the condition that caused it to
+interrupt. It queues a DFC to do the required processing. It disables the
+interrupts and FIQs on ARM, if required, to handle the interrupt, and enables
+them before leaving. It can also disable the source of the interrupt that
+it is servicing. </p>
+</conbody></concept>
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