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Adaptation/GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License
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"Eclipse Public License v1.0" which accompanies this distribution,
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors:
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1" xml:lang="en"><title>Remapping
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Cache Attributes and Access Permissions on ARMv6K and ARMv7 Platforms</title><shortdesc>Describes the behavior change brought about by remapping the cache
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attributes and the access permissions on the ARMv6K (ARM1176 &amp; ARM11MPCore),
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ARMv7 (Cortex-8N), and future platforms.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<ul>
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<li id="GUID-50632F8E-91A0-597C-8176-9FE352A8B9ED-GENID-1-2-1-8-1-1-5-1-1-20-1-3-1-1"><p> <xref href="GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1.dita#GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1/GUID-B8EA1997-C922-5E98-A32E-A77D641D11BC-GENID-1-2-1-8-1-1-5-1-1-20-1-3-2">Reduced set access permissions</xref>  </p> <ul>
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<li id="GUID-9225B023-192F-5D04-92BA-0278768872FF-GENID-1-2-1-8-1-1-5-1-1-20-1-3-1-1-2-1"><p> <xref href="GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1.dita#GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1/GUID-ABBF3854-B8B8-52A0-B3F6-1DF44A37194A-GENID-1-2-1-8-1-1-5-1-1-20-1-3-2-3">Affected kernel interface</xref>  </p> </li>
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</ul> </li>
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<li id="GUID-9851FDDF-8F0E-5AF1-AF7F-9C6273E9B0A8-GENID-1-2-1-8-1-1-5-1-1-20-1-3-1-2"><p> <xref href="GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1.dita#GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1/GUID-E137E4E9-AADA-5BCE-8FC8-504ACD486394-GENID-1-2-1-8-1-1-5-1-1-20-1-3-3">Remapping cache attributes</xref>  </p> <ul>
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<li id="GUID-6B59981E-754F-5E9B-80F1-99D53D464B70-GENID-1-2-1-8-1-1-5-1-1-20-1-3-1-2-2-1"><p> <xref href="GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1.dita#GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1/GUID-EDFD1FE0-ACD7-54B4-9633-0149E3FDF551-GENID-1-2-1-8-1-1-5-1-1-20-1-3-3-6">Types of memory supported</xref>  </p> </li>
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<li id="GUID-057483C0-F40F-503D-82D7-B2CC199AC9F9-GENID-1-2-1-8-1-1-5-1-1-20-1-3-1-2-2-2"><p> <xref href="GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1.dita#GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1/GUID-548E9689-F7AB-5F61-A8AE-EA2043E70D34-GENID-1-2-1-8-1-1-5-1-1-20-1-3-3-11">Mapping existing memory types</xref>  </p> </li>
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<li id="GUID-4D7899BC-B6AD-5C9F-9135-7E37F2CFC21E-GENID-1-2-1-8-1-1-5-1-1-20-1-3-1-2-2-3"><p> <xref href="GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1.dita#GUID-EC2D5CA5-538C-5375-B00D-3107CD87CFFC-GENID-1-2-1-8-1-1-5-1-1-20-1/GUID-F90E6B00-6492-5471-975F-3C078046627A-GENID-1-2-1-8-1-1-5-1-1-20-1-3-3-14">Mapping ARMv6K or ARMv7 onto TMappingAttributes</xref>. </p> </li>
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</ul> </li>
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</ul>
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<section id="GUID-B8EA1997-C922-5E98-A32E-A77D641D11BC-GENID-1-2-1-8-1-1-5-1-1-20-1-3-2"><title>Reduced set
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access permissions</title> <p>The ARMv6-style page table reserves three bits
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in the page/directory table for access permission, so eight possible values
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are available. The use of four possible access permissions is sufficient.
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Therefore, removing the surplus access permissions frees up one page table
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bit that is used by Symbian platform internally. </p> <p id="GUID-ABBF3854-B8B8-52A0-B3F6-1DF44A37194A-GENID-1-2-1-8-1-1-5-1-1-20-1-3-2-3"><b>Affected kernel interface</b> </p> <p>The
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shadow pages kernel interface is valid on all platforms except for the emulator.
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On ARMv6 and previous platforms, shadow pages are created using access permission <codeph>PrivilegedRW/UserRO</codeph>,
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this is not supported by the limited set of encoding. Shadow pages are now
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mapped as <codeph>PrivilegedRO/UserRO</codeph>, instead. </p> <codeblock id="GUID-9197EF7D-F549-5144-A322-4C04CD80CFCC-GENID-1-2-1-8-1-1-5-1-1-20-1-3-2-5" xml:space="preserve">class Epoc
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    {
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public:
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    ...
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    IMPORT_C static TInt AllocShadowPage(TLinAddr aRomAddr);
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    IMPORT_C static TInt FreeShadowPage(TLinAddr aRomAddr);
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    IMPORT_C static TInt FreezeShadowPage(TLinAddr aRomAddr);
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    ...
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    };</codeblock> <p>This represents a serious behaviour break in the kernel
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interface. A device driver (running on ARMv7) that creates a shadow page and
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then attempts to alter the content of the page now panics. </p> <p>This is
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a common use case for run-mode debuggers. However, a debugging interface is
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already provided, see <xref href="GUID-E91A8060-77E3-35F0-A945-7081406C79CE.dita"><apiname>DebugSupport</apiname></xref> in <filepath>...\memmodel\epoc\platform.h</filepath>,
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where breakpoints are managed internally by the kernel. Therefore, it is believed
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that a run-time debugger that uses the <codeph>CodeModifier</codeph> implementation
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in the kernel should not be affected by this change. </p> <p>After a shadow
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page is created using <xref href="GUID-3DC7B5F2-512E-3FF3-BC08-945DDE2AE680.dita#GUID-3DC7B5F2-512E-3FF3-BC08-945DDE2AE680/GUID-4FA10D18-3BA2-3307-B2E1-77C9CD8D2B6B"><apiname>Epoc::AllocShadowPage()</apiname></xref>, the kernel
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allows the device driver to alter its content using <xref href="GUID-3DC7B5F2-512E-3FF3-BC08-945DDE2AE680.dita#GUID-3DC7B5F2-512E-3FF3-BC08-945DDE2AE680/GUID-5B889008-BC18-3127-89EF-B8EAB0834190"><apiname>Epoc::CopyToShadowMemory()</apiname></xref>. </p> <p><note> <xref href="GUID-3DC7B5F2-512E-3FF3-BC08-945DDE2AE680.dita#GUID-3DC7B5F2-512E-3FF3-BC08-945DDE2AE680/GUID-EF014DA2-EE35-3DBD-A325-C5648AD27C36"><apiname>Epoc::FreezeShadowPage()</apiname></xref> is obsolete for platforms that use the reduced set of access permissions,
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as the shadow memory is always in a “frozen” state, because it can only be
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changed through the kernel interface.</note> </p> </section>
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<section id="GUID-E137E4E9-AADA-5BCE-8FC8-504ACD486394-GENID-1-2-1-8-1-1-5-1-1-20-1-3-3"><title>Remapping cache
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attributes </title> <p>ARMv6 architecture uses a large number of bits in the
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page table to describe all of the options for inner and outer cachability.
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No applications use all of these options simultaneously so a smaller number
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of configurable options has been implemented to meet the needs of the system. </p> <p>This
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alternative cache mapping allows up to eight different mappings in page tables.
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The Symbian platform kernel and device drivers do not need more
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than four or five different cache mappings. </p> <p>Cache mapping cannot be
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altered during run-time. It must be configured before the MMU is initialised. </p> <p>See
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the Bootstrap <xref href="GUID-5EB03086-A87D-5588-8927-7A7F8DB38366.dita">Port
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Implementation Tutorial</xref>. </p> <p id="GUID-EDFD1FE0-ACD7-54B4-9633-0149E3FDF551-GENID-1-2-1-8-1-1-5-1-1-20-1-3-3-6"><b>Types of memory supported</b> </p> <p>The
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kernel supports the following types of memory: </p> <table id="GUID-23FAD8A6-579B-5E3D-A705-A53BA304D529-GENID-1-2-1-8-1-1-5-1-1-20-1-3-3-8">
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<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/>
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<tbody>
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<row>
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<entry><p> <b>Memory type</b>  </p> </entry>
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<entry><p> <b>Description</b>  </p> </entry>
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</row>
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<row>
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<entry><p> <codeph>EMemAttStronglyOrdered</codeph>  </p> </entry>
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<entry><p>Writes are not combined. The order of memory accesses is preserved.
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Serves as a memory barrier, which means: </p> <ul>
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<li id="GUID-800FC168-69E5-5A89-B5A4-F34AF25E7F9E-GENID-1-2-1-8-1-1-5-1-1-20-1-3-3-8-1-3-2-2-2-1"><p>previous accesses to
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any type of memory must complete before accesses to strongly ordered memory
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start </p> </li>
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<li id="GUID-75C9FA7F-3BCC-50FE-B053-A48DEF46A2D2-GENID-1-2-1-8-1-1-5-1-1-20-1-3-3-8-1-3-2-2-2-2"><p>accesses to strongly
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ordered memory must complete before any further access to any type of memory
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takes place. </p> </li>
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</ul> <p>This type is used for hardware mapping. </p> </entry>
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</row>
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<row>
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<entry><p> <codeph>EMemAttDevice</codeph>  </p> </entry>
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<entry><p>Writes are not combined. The order of memory accesses is preserved.
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This type is used for hardware mapping. </p> </entry>
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</row>
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<entry><p> <codeph>EMemAttNormalUncached</codeph>  </p> </entry>
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<entry><p>Non cacheable memory: The order of accesses is not preserved. Writes
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may be combined. For example, this is used for video memory. </p> </entry>
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</row>
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<entry><p> <codeph>EMemAttNormalCached</codeph>  </p> </entry>
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<entry><p>Write-back read/write allocate cached memory, inner and outer. Used
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for “ordinary” memory. </p> </entry>
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</row>
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</tbody>
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</tgroup>
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</table> <p> <note> Device memory and normal memory can be set as shared or
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non-shared, strongly ordered accesses are assumed to be shared. </note></p> <p>The
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complete set of memory types supported by Symbian platform are represented
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by the values of the <xref href="GUID-7CB34E6F-CBF7-3F04-8CB1-2D6C29C73992.dita"><apiname>TMemoryType</apiname></xref> enum. </p> <p id="GUID-548E9689-F7AB-5F61-A8AE-EA2043E70D34-GENID-1-2-1-8-1-1-5-1-1-20-1-3-3-11"><b>Mapping existing memory
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types</b> </p> <p>The <xref href="GUID-1CE7A793-6313-372C-AC1A-6D3F6C6F5042.dita"><apiname>TMappingAttributes</apiname></xref> constants allow
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the cache attributes to be manipulated. On remapped platforms, these map into <xref href="GUID-7CB34E6F-CBF7-3F04-8CB1-2D6C29C73992.dita"><apiname>TMemoryType</apiname></xref> as
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follows: </p> <table id="GUID-24B0E1CD-67D9-5FAD-8984-9E202975F7EA-GENID-1-2-1-8-1-1-5-1-1-20-1-3-3-13">
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<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/>
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<tbody>
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<entry><p> <b> Memory type described by TMappingAttributes</b>  </p> </entry>
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<entry><p> <b>Memory type</b>  </p> </entry>
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<entry><p> <xref href="GUID-27DA5FEE-8F76-3D9E-8726-FA5CB808680A.dita"><apiname>EMapAttrFullyBlocking</apiname></xref>  </p> </entry>
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<entry><p> <xref href="GUID-F6F245E9-9DB7-3BEF-8F58-9A7F8E0F5D59.dita"><apiname>EMemAttStronglyOrdered</apiname></xref>  </p> </entry>
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</row>
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<entry><p> <xref href="GUID-B8ACFB0F-B457-358F-96EF-94BFBA6FE4A5.dita"><apiname>EMapAttrBufferedNC</apiname></xref>  </p> <p> <xref href="GUID-468C3800-7AEE-3219-9EBB-9C52971B3E0E.dita"><apiname>EMapAttrBufferedC</apiname></xref>  </p> </entry>
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<entry><p> <xref href="GUID-922F4FB9-57C0-31BF-ADFB-CC6B8376A39B.dita"><apiname>EMemAttDevice</apiname></xref>  </p> </entry>
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</row>
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<entry><p> <xref href="GUID-AE44E6A7-5CD2-31D9-A701-188B26CDEBB0.dita"><apiname>EMapAttrL1Uncached</apiname></xref>  </p> <p> <xref href="GUID-5ADA8BB4-A7B9-3347-B9A8-B50BE92F66BC.dita"><apiname>EMapAttrCachedWTRA</apiname></xref>  </p> <p> <xref href="GUID-54A8E3DA-996D-3317-A129-9AD12201E3C1.dita"><apiname>EMapAttrCachedWTWA</apiname></xref>  </p> </entry>
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<entry><p> <xref href="GUID-FD4404AF-192C-3D20-A4BC-AE1181A14E43.dita"><apiname> EMemAttNormalUncached</apiname></xref>  </p> </entry>
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</row>
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<entry><p> <xref href="GUID-FA3DD609-9C88-38C9-8719-4AB28B8E84EA.dita"><apiname>EMapAttrCachedWBRA</apiname></xref>  </p> <p> <xref href="GUID-9B211A60-6B45-31D5-A096-2B7944E651A0.dita"><apiname>EMapAttrCachedWBWA</apiname></xref>  </p> <p> <xref href="GUID-BB620F1F-FD18-3FCB-B1FC-7C3555F471B6.dita"><apiname>EMapAttrL1CachedMax</apiname></xref>  </p> <p> <xref href="GUID-72222BDB-E369-3D03-B3EE-A04B125EB2A3.dita"><apiname>EmapAttrCachedMax</apiname></xref>  </p> </entry>
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<entry><p> <xref href="GUID-2191E3C7-5F22-38D1-BB16-BD78B44AE7AA.dita"><apiname>EMemAttNormalCached</apiname></xref>  </p> </entry>
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</row>
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<entry><p> <xref href="GUID-A647726F-5569-3EAA-9E24-70FBEAF6F94B.dita"><apiname>EMapAttrAltCacheWTRA</apiname></xref>  </p> <p> <xref href="GUID-23C6459E-65F4-317E-B22D-6AB91A2F3462.dita"><apiname>EMapAttrAltCacheWTWA</apiname></xref>  </p> <p> <xref href="GUID-4F97DE5E-3031-3AB5-9646-996DD1EB9C15.dita"><apiname>EMapAttrAltCacheWBRA</apiname></xref>  </p> <p> <xref href="GUID-D34AE0F7-21A3-3B8C-B768-1A7840257780.dita"><apiname>EMapAttrAltCacheWBWA</apiname></xref>  </p> </entry>
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<entry><p>Return error </p> </entry>
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<entry><p> <xref href="GUID-1E6DD28F-F53C-34F0-B5A1-88263389ACF7.dita"><apiname>EMapAttrL2CachedWTRA</apiname></xref>  </p> <p> <xref href="GUID-1695C568-36F8-3860-8253-D25CC6F2100E.dita"><apiname>EMapAttrL2CachedWTWA</apiname></xref>  </p> <p> <xref href="GUID-E82A15FB-6A92-388F-A6F2-AA0DBAC720E8.dita"><apiname>EMapAttrL2CachedWBRA</apiname></xref>  </p> <p> <xref href="GUID-CAD3DE19-9508-319E-9C61-1E7910D30AC9.dita"><apiname>EMapAttrL2CachedWBWA</apiname></xref>  </p> <p> <xref href="GUID-CE3B3839-E9B5-3B8F-AB41-3F589CD3347C.dita"><apiname>EMapAttrL2CachedMax</apiname></xref>  </p> </entry>
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<entry><p>Takes no effect. Only the inner cache description matters. </p> <p>This
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policy is already in place on ARMv5 platforms with L210, where the page table
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does not support a separate description of the inner and outer cache attributes. </p> </entry>
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</row>
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</tbody>
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</tgroup>
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</table> <p id="GUID-F90E6B00-6492-5471-975F-3C078046627A-GENID-1-2-1-8-1-1-5-1-1-20-1-3-3-14"><b> Mapping ARMv6K or ARMv7
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onto TMappingAttributes</b> </p> <p>To describe memory on ARMv6K or ARMv7
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using the original <xref href="GUID-1CE7A793-6313-372C-AC1A-6D3F6C6F5042.dita"><apiname>TMappingAttributes</apiname></xref> bit mask, the device
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driver should use the following values: </p> <table id="GUID-C5D9F8B3-670A-5595-BE7A-288E34E077ED-GENID-1-2-1-8-1-1-5-1-1-20-1-3-3-16">
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<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/>
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<tbody>
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<entry><p> <b>ARMv6K/v7 memory type TMemoryType</b>  </p> </entry>
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<entry><p> <b>TMappingAttributes mask to use</b>  </p> </entry>
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</row>
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<entry><p> <codeph>EMemAttStronglyOrdered</codeph>  </p> </entry>
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<entry><p> <codeph>EMapAttrFullyBlocking</codeph>  </p> </entry>
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</row>
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<entry><p> <codeph>EMemAttDevice</codeph>  </p> </entry>
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<entry><p> <codeph>EMapAttrBufferedNC</codeph>  </p> </entry>
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</row>
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<entry><p> <codeph>EMemAttNormalUncached</codeph>  </p> </entry>
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<entry><p> <codeph>EMapAttrL1Uncached</codeph>  </p> </entry>
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</row>
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<entry><p> <codeph>EMemAttNormalCached</codeph>  </p> </entry>
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<entry><p> <codeph>EmapAttrCachedMax</codeph>  </p> </entry>
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</row>
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</tbody>
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</tgroup>
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</table> </section>
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</conbody></concept>
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