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1 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // e32\include\drivers\dmasupport.h |
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15 // |
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16 // |
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17 |
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18 #ifndef DMASUPPORT_H |
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19 #define DMASUPPORT_H |
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20 |
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21 #include "plat_priv.h" |
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22 #include <d32locd.h> |
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23 |
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24 |
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25 class TLocDrvRequest; |
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26 |
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27 /** |
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28 @internalTechnology |
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29 @prototype |
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30 |
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31 Class used for read / write requests to the local media subsystem to gain access |
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32 to physical memory address to make use of DMA without the need of an intermediate buffer. |
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33 */ |
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34 class DDmaHelper : public DBase |
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35 { |
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36 public: |
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37 |
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38 enum TMemoryType |
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39 { |
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40 EUnknown, |
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41 EFileServerChunk, |
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42 ESharedChunk, |
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43 }; |
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44 |
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45 /** |
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46 Class used to describe a number of contiguous physical pages |
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47 */ |
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48 class TPageList |
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49 { |
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50 public: |
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51 TPhysAddr iAddress; // address of page |
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52 TInt iLength; |
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53 }; |
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54 |
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55 public: |
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56 DDmaHelper(); |
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57 ~DDmaHelper(); |
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58 |
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59 TInt Construct(TInt aLength, TInt aMediaBlockSize, TInt aDmaAlignment); |
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60 |
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61 TInt SendReceive(TLocDrvRequest& aReq, TLinAddr aLinAddress); |
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62 TInt GetPhysicalAddress(TPhysAddr& aAddr, TInt& aLen); |
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63 |
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64 #ifdef __DEMAND_PAGING__ |
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65 static TInt GetPhysicalAddress(TLocDrvRequest& aReq, TPhysAddr& aAddr, TInt& aLen); |
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66 #endif |
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67 inline TInt PageSize() const { return iPageSize; } |
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68 |
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69 private: |
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70 |
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71 static inline TInt PageSizeLog2(); |
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72 static inline TBool IsPageAligned(TLinAddr aAddr); |
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73 static inline TLinAddr PageAlign(TLinAddr aAddr); |
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74 static inline TLinAddr PageOffset(TLinAddr aAddr); |
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75 |
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76 inline TInt MaxFragLength() const; |
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77 inline void SetFragLength(TInt aLength); |
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78 inline TInt FragLength() const; |
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79 inline TInt LengthRemaining() const; |
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80 inline TUint32 LengthConsumed() const; |
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81 |
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82 inline TBool IsDmaAligned(TLinAddr aAddr); |
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83 inline TBool IsBlockAligned(TInt64 aPos); |
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84 inline TInt64 BlockAlign(TInt64 aPos); |
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85 inline TInt BlockOffset(TInt64 aPos); |
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86 |
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87 inline TLinAddr LinAddress() const; |
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88 |
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89 void ResetPageLists(); |
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90 |
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91 TInt UpdateRemoteDescriptorLength(TInt aLength); |
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92 |
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93 TInt RequestStart(); |
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94 void RequestEnd(); |
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95 void BuildPageList(); |
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96 void ReleasePages(TLinAddr aAddr); |
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97 |
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98 private: |
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99 TInt iMediaBlockSize; // Minimum transfer size (bytes) for the media. |
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100 TInt64 iMediaBlockSizeMask; // iMediaBlockSize - 1 |
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101 TInt iDmaAlignment; // DMA Alignment req for media's DMA controller i.e. word alignment |
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102 |
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103 static TInt iPageSize; // Memory page size in bytes (e.g. 4096 Bytes) |
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104 static TInt iPageSizeLog2; // Log2 of page size (e.g. 4096 -> 12) |
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105 static TInt iPageSizeMsk; // Mask of page size (e.g. 4096-1 -> 4095) |
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106 TInt iMaxPages; // Maximum number of pages that can be stored by this object |
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107 |
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108 DThread* iRemoteThread; // |
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109 DThread* iCurrentThread; // |
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110 DThread* iOwningThread; // Thread owning remote descriptor, either iRemoteThread or iCurrentThread |
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111 |
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112 TLocDrvRequest* iReq; // Current TLocDrvRequest |
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113 |
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114 // The following attributes are copied from the current TLocDrvRequest |
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115 TInt iReqId; |
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116 TInt iReqRemoteDesOffset; |
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117 TInt iReqFlags; // |
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118 TInt iReqLenClient; // length of data requested by client (unmodified) |
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119 TInt64 iReqPosClient; // position of data requested by client (unmodified) |
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120 |
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121 TLinAddr iLinAddressUser; // linear address of client buffer in user process |
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122 TLinAddr iLinAddressKernel; // linear address of client buffer in kernel process |
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123 TInt iFragLen; // length of data to be read into physical pages (possibly < a multiple of the page-size) |
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124 TInt iFragLenRemaining; // length of data to be read left in this fragment |
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125 |
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126 TMemoryType iMemoryType; |
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127 |
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128 /** array of (possibly non-contiguous) pages */ |
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129 TPhysAddr* iPageArray; |
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130 TInt iPageArrayCount; |
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131 |
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132 /** list of contiguous pages */ |
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133 TPageList* iPageList; |
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134 TInt iPageListCount; |
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135 |
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136 TInt iIndex; // Current memory fragment index |
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137 |
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138 /** Represents the current read/write position in terms of an offset |
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139 from the start of the caller's linear address */ |
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140 TInt iLenConsumed; // Offset from start of client buffer |
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141 |
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142 DChunk* iChunk; // Shared chunk object in use |
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143 TInt iChunkOffset; // Offset within shared chunk |
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144 TUint32 iMapAttr; // mmu mapping attributes for the Shared chunk or pinned physical memory. |
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145 TUint32 iPhysAddr; // Physical Address of chunk (if contiguous) |
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146 |
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147 TInt iLockCount; // Prevent 2+ threads accessing this object |
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148 |
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149 TBool iPhysPinningAvailable; // True if physical memory pinning Kernel interface is available |
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150 TUint iPageColour; // Mapping colour of the first page in iPageArray. |
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151 TPhysicalPinObject* iPhysicalPinObject; // Physical pinning object. |
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152 }; |
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153 |
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154 |
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155 |
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156 #endif // DMASUPPORT_H |