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55 lines
2.0 KiB
XML
55 lines
2.0 KiB
XML
7 years ago
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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Copyright (c) 2016 OpenPOWER Foundation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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version="5.0"
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xml:id="Hot_Plug_Events">
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<title>Hot Plug Events</title>
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7 years ago
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<para>Hot Plug Events, when implemented, are reported through
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either the event-scan RTAS call or a hotplug interrupt.</para>
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<para>An OS that wants to be notified of hotplug events will need to
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set the appropriate arch-vector bit. Look for the hot-plug-events
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node in the /event-sources node of the OF device tree (see
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<xref linkend="LoPAR.DeviceTree" />), enable the interrupts listed
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in its “interrupts” property and provide an interrupt handler to call
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check-exception when one of those interrupts are received.</para>
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<para>When a hotplug event occurs, whether reported by check-exception
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or event-scan, RTAS will directly pass back the Hotplug Event Log as
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described in <xref linkend="table.error.hotplug" />.</para>
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7 years ago
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<variablelist>
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<varlistentry>
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<term><emphasis role="bold">R1-<xref linkend="Hot_Plug_Events"
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xrefstyle="select: labelnumber nopage"/>-1.</emphasis></term>
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<listitem>
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<para>If FRUs can be hot plugged in the system
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without OS support, the Hot Plug Event mechanism must be provided for
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signaling the OS about the event.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</section>
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