kernel/eka/drivers/hcr/hcr_hai.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 09:24:54 +0200
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// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of the License "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// Hardware Configuration Respoitory Platform Independent Layer (PIL)
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//
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/** 
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@file hcr_hai.h
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Kernel side definitions for the HCR Symbian Hardware Abstraction 
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Interface (SHAI) for variants to implement when creating a HCR.dll binary.
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@publishedPartner
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@prototype
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*/
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#ifndef HCR_HAI_H
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#define HCR_HAI_H
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// -- INCLUDES ----------------------------------------------------------------
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#include <e32def.h>
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#include <e32err.h> 
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#include <drivers/hcr.h>
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// -- CLASSES -----------------------------------------------------------------
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/**
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The HCR namespace contains all the types and classes that make up the
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Kernel side Hardware Configuration Repository (HCR).
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*/
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namespace HCR
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    {
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	/** Constant defined for the first HCR repository format. Used for both 
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	compiled and file repositories. 	
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	@see SRepositoryBase::iFormatVersion	
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	*/	    
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    static const TInt KRepositoryFirstVersion = 0x0001;
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    /** Interface class defining the methods variants must implement to provide
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    a complete HCR component for the targeted variant.  
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    The HCR supports three repositories and it is recommended that as few of 
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    these are employed for a variant to minimise lookup overheads as setting 
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    override flexibility is provided at the expense of lookup performance.       
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    */
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    class MVariant
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        {
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    public:
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        /** 
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        Perform platform specific initialisation of variant HCR object. Invoked 
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        during HCR kernel extension module initialisation. 
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        Note: an error code from this method will prevent device startup.
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    	@return	KErrNone if successful, or any other system wide error code.
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        */    
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        virtual TInt Initialise() = 0;
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    	/**
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        This method returns the address of the compile time setting repository 
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        built into the variant HCR.dll project/binary. This repository is 
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        optional and may be absent in which case 0 should be returned in aAddr. 
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        @param aAddr out: a pointer to a HCR::SRepositoryCompiled 
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    	@return	KErrNone if successful, output parameters valid,
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    	        KErrNotSupported if a compile time repository is not supported,
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    	        Any other system wide error code.
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        @see HCR::SRepositoryCompiled
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       	*/
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        virtual TInt GetCompiledRepositoryAddress(TAny* & aAddr) = 0;
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   	    /**
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        This method is called at kernel initialisation and allows the PSL to 
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		disable the initial lookup of the built-in Core Image file repository. 
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		The PSL should return ETrue if the device/BSP is not going to support 
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		this repository. 	
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    	@return	ETrue if the PIL should not find the repository in the ROM
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    	        EFalse if the core image repository is to be used/supported
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       	*/
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        virtual TBool IgnoreCoreImgRepository () = 0;
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    	/**
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        This method returns the address of the override repository that 
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        provides override values for the variant. Typically this repository
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        is held in NAND flash and shadowed in RAM by the OS loader. It is
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        a read-only settings repository. This repository is optional and may 
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        be absent in which case 0 should be returned in aAddr.
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        @param aAddr out: a pointer to a HCR::SRepositoryFile
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    	@return	KErrNone if successful, output parameters valid,
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    	        KErrNotSupported if a compile time repository is not supported,
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    	        Any other system wide error code.
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        @see HCR::SRepositoryFile
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       	*/
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        virtual TInt GetOverrideRepositoryAddress(TAny* & aAddr) = 0;
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        };       
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    /** Union that holds one of the supported word-sized setting values 
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    */
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    union UValueWord
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        {
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        TInt32      iInt32;
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        TInt16      iInt16;
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        TInt8       iInt8;
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        TBool       iBool;
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        TUint32     iUInt32;
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        TUint16     iUInt16;
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        TUint8      iUInt8;
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        TLinAddr    iAddress;
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        };
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    /** Union that holds a pointer to one of the supported large value types 
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    */
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    union UValueLarge
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        {
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        TUint8*     iData;          //!< Array of TUint8 values
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        TText8*     iString8;       //!< Array of TText8 values
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		TInt32*		iArrayInt32;	//!< Array of TInt32 values
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		TUint32*	iArrayUInt32;	//!< Array of TUInt32 values
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        TInt64*     iInt64;         //!< Single TInt64 value
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        TUint64*    iUInt64;        //!< Single TUint64 value
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        };
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    /** Type used to hold the offset to a large setting value */
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    typedef TInt TValueLargeOffset;
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    /** Union type used to hold either the literal value or a C++ pointer to 
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    the value. Used in compile time settings.   
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    */
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    union USettingValueC
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        {
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        UValueWord  iLit;
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        UValueLarge iPtr;
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        };
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    /** Union type used to hold either the literal value or an offset from the 
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    start if the setting repository to the setting value. Used in file and RAM
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    mapped settings.   
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    */
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    union USettingValueF
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        {
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        UValueWord          iLit;
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        TValueLargeOffset   iOffset;
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        };
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    /** Metadata flags to describe properties of the settings.
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    */
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    enum TSettingProperties
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        {
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        EPropUndefined     = 0x0000,   //!< Unknown/not set
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        // Following properties are not yet supported:
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        EPropUnintiailised = 0x0001,   //!< Setting has no initial value
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        EPropModifiable    = 0x0002,   //!< Setting is set/writable
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        EPropPersistent    = 0x0004,   //!< Setting is non-volatile
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        // Following properties are not yet supported but are envisaged to be
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		// implemented to support setting breaks/migration where settings 
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		// evolve and/or replace each other.
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        EPropDeprecated	   = 0x1000,   //!< Setting supported but deprecate, accessed logged
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		EPropReplaced      = 0x2000,   //!< HCR redirected to retrieve value from replacement setting, access logged
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		EPropWithdrawn	   = 0x4000    //!< Setting withdrawn, log & panic if accessed 
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        };        
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    /** Provides base class for setting records. All setting structures start
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    with this structure providing common setting attributes such as the
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    identifier, type etc.    
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    */
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    struct SSettingBase
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        {
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        SSettingId  iId;        // Always the first member!
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        TInt32      iType;      //!< @see TSettingType
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        TUint16     iFlags;     //!< @See TSettingProperties
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        TUint16     iLen;       //!< Only valid if setting is a large type
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        };
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    /** This structure holds a setting defined at compile time within a compile
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    time defined repository.     
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    @see SRepositoryCompiled
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    */
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    struct SSettingC            // : public SSettingBase
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        {
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        SSettingBase    iName;  // Always the first member!
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        USettingValueC  iValue;
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        };
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    /** This structure holds a setting define in a file or memory within a file
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    based repository.     
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    @see SRepositoryFile
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    */
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    struct SSettingF             // : public SSettingBase
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        {
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        SSettingBase    iName;   // Always the first member!
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        USettingValueF  iValue;
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        };
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   215
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    /** Metadata flags to describe the repository type/layout.
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    */
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    enum TRepositoryType
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        {
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        EReposUndefined = 0x00,   //!< Unknown
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        EReposCompiled  = 'c',   //!< Repository is in Compiled layout
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        EReposFile      = 'f'    //!< Repository is in File layout
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        };        
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    /** Metadata flags to describe repository properties.
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    */
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    enum TRepositoryProperties
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        {
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        EReposClear       = 0x0000,   //!< Unknown
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        EReposReadOnly    = 0x0001,   //!< Repository is read-only
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        EReposNonVolatile = 0x0002    //!< Repository is writable, saved to flash
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        };        
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    /** Provides base class for setting repositories. All repository structures 
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    start with this structure providing common repository attributes such as the
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    type , size etc.   
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    */
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    struct SRepositoryBase
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        {
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        TUint8      iFingerPrint[3];    //!< Fixed value {'H', 'C', 'R'}
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        TUint8      iType;              //!< @See TRepositoryType
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        TInt16      iFormatVersion;     //!< Format/layout version number
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        TUint16     iFlags;             //!< @see TRepositoryProperties
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        TInt32      iNumSettings;       //!< Number of settings in repository
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        };    
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    /** This class is the root object for a compile time defined settings 
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    repository and is used in the PSL HCR variant object to hold read-only
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    compile time settings. This type of repository makes use of pointers to 
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    structures and arrays as it is compiled.
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    */
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    struct SRepositoryCompiled
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        {
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        SRepositoryBase*    iHdr;        // Always the first member!
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        SSettingC*          iOrderedSettingList;
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        };    
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    /** Byte type for large setting value data 
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    */
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    typedef TUint8 TSettingData;
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    /** This class is the root object for a file or memory based settings 
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    repository. It assumes the repository has a flat contiguous layout and
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    employees offsets to data rather then C++ pointers as in compiled 
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    setting repositories.                 
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    All offsets are relative to the address of &iHdr member.
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    The last two members are expected to be present in the file/memory as shown
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    although there is no way at type definition time to know the size of these
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    members, hence they are commented out and will be accessed in the code
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    using memory/file address arithmetic.
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    */
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    struct SRepositoryFile 
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        {
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        SRepositoryBase     iHdr;        // Always the first member!
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        TUint32             iLSDfirstByteOffset;
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		TUint32             iLSDataSize;
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		TUint32				iReserved[3];
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     // SSettingF           iOrderedSettingList[iNumSettings];
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     // TSettingData        iLargeSettingsData[iLSDataSize];
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        };    
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    }
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// -- GLOBALS -----------------------------------------------------------------
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/**
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Global entry point used by PIL to create the variant HCR object in the PSL
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code.
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@return Pointer to variant is successfully, 0 otherwise.
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@see HCR::MVariant
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*/
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GLREF_C HCR::MVariant* CreateHCRVariant(); 
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// -- MACROS ------------------------------------------------------------------
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/** 
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Global macro for use in defining the finger print field of a 
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SRepositoryCompiled.iHdr instance in the PSL compiled repository static data.
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Macro used in PSL source as the value for the finger print field in a
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compiled repository.
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@see SRepositoryBase::iFingerPrint
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*/
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#define HCR_FINGER_PRINT {'H', 'C', 'R'}
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/** 
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Global macro for use in defining the finger print field of a 
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SRepositoryCompiled.iHdr instance in the PSL compiled repository static data.
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Macro used in PSL source as the value for the finger print field in a
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compiled repository.
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@see SRepositoryBase::iFingerPrint
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*/
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#define HCR_SETTING_COUNT(a) (sizeof(a)/sizeof(SSettingC))
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/**
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Global macro for use in setting the flags attribute of a SSettingC 
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instance in the PSL compiled repository static data.
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@see HCR::MVariant
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@see HCR::SRepositoryCompiled
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*/
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#define HCR_FLAGS_NONE		HCR::EPropUndefined
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/**
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Global macro for use in setting the length attribute of a SSettingC 
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instance in the PSL compiled repository static data.
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@see HCR::MVariant
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@see HCR::SRepositoryCompiled
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*/
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#define HCR_LEN_NA			0x0000
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/**
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Global macro for use in defining the actual integer (word) value of a SettingC 
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instance in the PSL compiled repository static data. This can be used to 
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simplify the setting table for settings with the type flag
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set to one of 0x0000FFFF.
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@see HCR::MVariant
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@see HCR::SRepositoryCompiled
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*/
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#define HCR_WVALUE(a)	static_cast<TInt32>(a)
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/**
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Global macro for use in assigning the address of a large setting value to an 
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instance of a SettingC in the PSL compiled repository static data. This can be 
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used to simplify the setting table for settings with the type flag
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set to one of 0xFFFF0000.
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@see HCR::MVariant
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@see HCR::SRepositoryCompiled
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*/
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#define HCR_LVALUE(a)	reinterpret_cast<TInt32>(a)
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/**
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Global macro used as last entry in a PSL compiled repository static data. 
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The main use of this is to avoid the "last entry needs no following comma" issue
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and to aid HCR initial thead testing. 
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The Setting (0xffffffff, 0xffffffff) was choosen as it should never appear in
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a real variant as this category UID can not be allocated offically. Testers
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should also be aware of the special use of this setting so as not to use it in
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a file repository.
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@see HCR::MVariant
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@see HCR::SRepositoryCompiled
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*/
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#define HCR_LAST_SETTING { { { 0xFFFFFFFF, 0xFFFFFFFF}, ETypeUInt32, HCR_FLAGS_NONE, HCR_LEN_NA }, { { 0x4C415354 }}}
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#endif // HCR_HAI_H