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1 // Copyright (c) 2006-2009 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\memmodel\epoc\mmubase\kblockmap.cpp |
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15 // |
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16 // |
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17 |
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18 #include <memmodel/epoc/mmubase/kblockmap.h> |
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19 #include <e32cmn.h> |
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20 #include <e32cmn_private.h> |
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21 #include <e32atomics.h> |
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22 |
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23 #undef ASSERT |
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24 |
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25 #ifdef __KERNEL_MODE__ |
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26 |
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27 #include <kernel/kernel.h> |
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28 #define TRACECLASS Kern |
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29 #undef TRACE |
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30 #define ASSERT(x) __NK_ASSERT_DEBUG(x) |
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31 #define FREE(x) Kern::Free(x) |
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32 |
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33 #define RETURN_ERROR(err, traceMsg) \ |
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34 { \ |
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35 __KTRACE_OPT(KPAGING,Kern::Printf("DP: %s, returning error %d", traceMsg, err)); \ |
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36 return err; \ |
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37 } |
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38 |
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39 #define TRACE_FATAL(x) __KTRACE_OPT(KPANIC, Kern::x) |
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40 |
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41 #else |
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42 |
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43 #include <e32debug.h> |
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44 #include <e32test.h> |
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45 #define TRACECLASS RDebug |
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46 extern RTest test; |
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47 #define ASSERT(x) test(x); |
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48 #define FREE(x) User::Free(x) |
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49 |
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50 #define RETURN_ERROR(err, traceMsg) \ |
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51 { \ |
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52 RDebug::Printf("DP: %s, returning error %d", traceMsg, err); \ |
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53 return err; \ |
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54 } |
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55 |
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56 #define TRACE_FATAL(x) RDebug::x |
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57 |
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58 #endif |
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59 |
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60 TInt TBlockMap::Initialise(const SBlockMapInfoBase& aBlockMapInfo, |
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61 TBlockMapEntryBase* aBlockMapEntries, |
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62 TInt aBlockMapEntriesSize, |
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63 TInt aReadUnitShift, |
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64 TInt aDataLengthInFile) |
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65 { |
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66 ASSERT(iExtents == NULL); |
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67 |
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68 if (aBlockMapEntriesSize % sizeof(TBlockMapEntryBase) != 0) |
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69 RETURN_ERROR(KErrArgument, "Size of block map is not multiple of entry size"); |
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70 iExtentCount = aBlockMapEntriesSize / sizeof(TBlockMapEntryBase); |
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71 |
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72 TInt blockShift = __e32_find_ms1_32(aBlockMapInfo.iBlockGranularity); |
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73 if ((1u << blockShift) != aBlockMapInfo.iBlockGranularity) |
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74 RETURN_ERROR(KErrArgument, "Block granularity not a power of two"); |
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75 if (blockShift < aReadUnitShift) |
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76 RETURN_ERROR(KErrArgument, "Block size must be greater than or equal to read unit size"); |
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77 TInt blockScaling = blockShift - aReadUnitShift; |
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78 TInt readUnitMask = (1 << aReadUnitShift) - 1; |
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79 |
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80 if ((aBlockMapInfo.iStartBlockAddress & ((1 << aReadUnitShift) - 1)) != 0) |
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81 RETURN_ERROR(KErrArgument, "Block zero address not a multiple of read unit size"); |
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82 TUint blockZeroNumber = (TUint)(aBlockMapInfo.iStartBlockAddress >> aReadUnitShift); // offset of block zero from start of partition |
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83 |
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84 if (aBlockMapInfo.iBlockStartOffset >= aBlockMapInfo.iBlockGranularity) |
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85 RETURN_ERROR(KErrArgument, "Block start offset must be less than block size"); |
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86 |
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87 if (aDataLengthInFile <= 0) |
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88 RETURN_ERROR(KErrArgument, "Length of code data in file must be greater than zero"); |
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89 iDataLength = aDataLengthInFile; |
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90 |
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91 // Process block map data into kernel-side reprsentation |
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92 TInt dataOffset = -(TInt)(aBlockMapInfo.iBlockStartOffset & readUnitMask); |
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93 SExtent entry; |
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94 for (TInt i = 0 ; i < iExtentCount ; ++i) |
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95 { |
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96 const TBlockMapEntryBase& data = aBlockMapEntries[i]; |
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97 entry.iDataOffset = dataOffset; |
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98 entry.iBlockNumber = (data.iStartBlock << blockScaling) + blockZeroNumber; |
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99 dataOffset += data.iNumberOfBlocks << blockShift; |
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100 if (i == 0) |
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101 { |
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102 TInt adjustStartBlock = aBlockMapInfo.iBlockStartOffset >> aReadUnitShift; |
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103 entry.iBlockNumber += adjustStartBlock; |
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104 dataOffset -= adjustStartBlock << aReadUnitShift; |
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105 } |
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106 (SExtent&)data = entry; |
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107 } |
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108 |
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109 if (dataOffset < iDataLength) |
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110 RETURN_ERROR(KErrArgument, "Block map too short"); |
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111 |
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112 // Take ownership of buffer |
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113 iExtents = (SExtent*) aBlockMapEntries; |
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114 |
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115 return KErrNone; |
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116 } |
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117 |
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118 TBlockMap::TBlockMap() |
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119 : iExtents(NULL) |
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120 { |
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121 } |
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122 |
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123 TBlockMap::~TBlockMap() |
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124 { |
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125 FREE(iExtents); |
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126 } |
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127 |
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128 TInt TBlockMap::FindFirstExtent(TInt aPos) const |
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129 { |
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130 if (aPos < 0 || aPos >= iDataLength) |
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131 return KErrArgument; |
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132 RArray<SExtent> extents(sizeof(SExtent), iExtents, iExtentCount); |
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133 SExtent findEntry = { aPos, 0 }; |
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134 TInt i = -1; |
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135 extents.SpecificFindInSignedKeyOrder(findEntry, i, EArrayFindMode_Last); |
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136 --i; |
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137 if (i < 0 || i >= iExtentCount) |
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138 return KErrArgument; |
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139 return i; |
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140 } |
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141 |
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142 TInt TBlockMap::Read(TLinAddr aBuffer, TInt aPos, TInt aLength, TInt aReadUnitShift, TReadFunc aReadFunc, TAny* aArg1, TAny* aArg2) const |
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143 { |
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144 TInt dataOffset = aPos; |
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145 TInt remain = aLength; |
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146 TInt readUnitMask = (1 << aReadUnitShift) - 1; |
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147 |
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148 TInt i = FindFirstExtent(dataOffset); |
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149 if (i < 0) |
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150 return i; |
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151 TInt bufferStart = (dataOffset - Extent(i).iDataOffset) & readUnitMask; // start of page in buffer |
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152 TInt bufferOffset = 0; |
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153 while (remain > 0) |
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154 { |
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155 if (i >= Count()) |
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156 return KErrArgument; |
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157 |
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158 const SExtent& extent = Extent(i); |
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159 TInt blockStartOffset = dataOffset - extent.iDataOffset; |
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160 TInt blockNumber = extent.iBlockNumber + (blockStartOffset >> aReadUnitShift); |
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161 TInt nextExtentStart = i == Count() - 1 ? iDataLength : Extent(i + 1).iDataOffset; |
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162 TInt dataSize = Min(remain, nextExtentStart - dataOffset); |
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163 TInt blockCount = (dataSize + (blockStartOffset & readUnitMask) + readUnitMask) >> aReadUnitShift; |
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164 |
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165 TInt r = aReadFunc(aArg1, aArg2, aBuffer + bufferOffset, blockNumber, blockCount); |
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166 if (r != KErrNone) |
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167 { |
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168 TRACE_FATAL(Printf("TBlockMap::Read: error reading media at %08x + %x: %d", blockNumber << aReadUnitShift, blockCount << aReadUnitShift, r)); |
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169 return r; |
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170 } |
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171 |
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172 bufferOffset += blockCount << aReadUnitShift; |
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173 dataOffset += dataSize; |
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174 remain -= dataSize; |
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175 ++i; |
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176 } |
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177 |
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178 return bufferStart; |
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179 } |
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180 |
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181 #ifdef _DEBUG |
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182 |
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183 void TBlockMap::Dump() const |
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184 { |
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185 TRACECLASS::Printf("TBlockMap:"); |
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186 for (TInt i = 0 ; i < Count() ; ++i) |
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187 { |
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188 TInt nextExtentStart = i == Count() - 1 ? iDataLength : Extent(i + 1).iDataOffset; |
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189 TRACECLASS::Printf(" %d: %08x -> %08x: %08x", i, Extent(i).iDataOffset, nextExtentStart, Extent(i).iBlockNumber); |
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190 } |
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191 } |
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192 |
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193 #endif |