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1 // Copyright (c) 1994-2009 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\multiple\arm\xkernel.cpp |
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15 // |
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16 // |
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17 |
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18 #include "arm_mem.h" |
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19 |
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20 |
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21 /******************************************** |
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22 * Thread |
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23 ********************************************/ |
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24 |
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25 TInt DArmPlatThread::SetupContext(SThreadCreateInfo& aInfo) |
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26 { |
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27 switch(iThreadType) |
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28 { |
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29 case EThreadSupervisor: |
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30 case EThreadMinimalSupervisor: |
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31 case EThreadInitial: |
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32 case EThreadAPInitial: |
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33 break; |
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34 case EThreadUser: |
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35 #ifndef __SMP__ |
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36 iNThread.iSpare3 /*iUserContextType*/ = NThread::EContextUndefined; |
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37 #endif |
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38 break; |
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39 } |
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40 iNThread.SetAddressSpace(iOwningProcess); |
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41 iNThread.SetAttributes(KThreadAttAddressSpace); |
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42 iAliasPdePtr = &PageDirectory(((DMemModelProcess*)iOwningProcess)->iOsAsid)[KIPCAlias>>KChunkShift]; |
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43 return KErrNone; |
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44 } |
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45 |
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46 /******************************************** |
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47 * Process |
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48 ********************************************/ |
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49 |
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50 DArmPlatProcess::DArmPlatProcess() |
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51 { |
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52 iAddressCheckMaskR=0x000fffffu; // addresses<0xA0000000 OK |
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53 iAddressCheckMaskW=0x0000ffffu; // addresses<0x80000000 OK |
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54 } |
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55 |
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56 void FlushTLBs(); |
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57 DArmPlatProcess::~DArmPlatProcess() |
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58 { |
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59 __KTRACE_OPT(KMMU,Kern::Printf("DArmPlatProcess destruct")); |
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60 FlushTLBs(); |
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61 DMemModelProcess::Destruct(); |
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62 } |
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63 |
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64 TInt DArmPlatProcess::GetNewChunk(DMemModelChunk*& aChunk, SChunkCreateInfo& aInfo) |
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65 { |
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66 aChunk=NULL; |
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67 DArmPlatChunk* pC=new DArmPlatChunk; |
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68 if (!pC) |
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69 return KErrNoMemory; |
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70 aChunk=pC; |
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71 TChunkType type = aInfo.iType; |
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72 pC->iChunkType=type; |
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73 TInt r=pC->SetAttributes(aInfo); |
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74 if(r==KErrNone) |
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75 { |
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76 if(type==ESharedKernelSingle || type==ESharedKernelMultiple || type==ESharedIo) |
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77 { |
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78 DArmPlatChunk* pM=new DArmPlatChunk; |
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79 if (!pM) |
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80 return KErrNoMemory; |
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81 pC->iKernelMirror = pM; |
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82 pM->iChunkType = ESharedKernelMirror; |
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83 r=pM->SetAttributes(aInfo); |
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84 } |
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85 } |
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86 return r; |
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87 } |
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88 |
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89 TInt DArmPlatChunk::SetAttributes(SChunkCreateInfo& aInfo) |
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90 { |
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91 switch(iChunkType) |
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92 { |
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93 case EKernelData: |
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94 iAttributes = EAddressFixed|EMapTypeGlobal|EPrivate; |
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95 break; |
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96 case ERamDrive: |
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97 iAttributes = EAddressFixed|EMapTypeGlobal|EPrivate; |
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98 break; |
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99 case EKernelStack: |
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100 iAttributes = EAddressKernel|EMapTypeGlobal|EPrivate; |
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101 break; |
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102 case EKernelCode: |
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103 iAttributes = EAddressKernel|EMapTypeGlobal|EPrivate|ECode; |
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104 break; |
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105 case EDll: |
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106 case EUserCode: |
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107 if (aInfo.iGlobal) |
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108 iAttributes = EAddressUserGlobal|EMapTypeGlobal|ECode; |
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109 else |
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110 iAttributes = EAddressFixed|EMapTypeLocal|EPrivate|ECode; |
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111 break; |
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112 case EUserData: |
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113 if (aInfo.iGlobal) |
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114 iAttributes = EAddressShared|EMapTypeShared; |
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115 else |
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116 iAttributes = EAddressLocal|EMapTypeLocal|EPrivate; |
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117 break; |
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118 case EDllData: |
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119 iAttributes = EAddressFixed|EMapTypeLocal|EPrivate; |
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120 break; |
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121 case EUserSelfModCode: |
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122 if (aInfo.iGlobal) |
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123 iAttributes = EAddressShared|EMapTypeShared|ECode; |
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124 else |
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125 iAttributes = EAddressLocal|EMapTypeLocal|EPrivate|ECode; |
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126 break; |
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127 case ESharedKernelSingle: |
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128 case ESharedKernelMultiple: |
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129 case ESharedIo: |
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130 iAttributes = EAddressShared|EMapTypeShared; |
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131 break; |
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132 case ESharedKernelMirror: |
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133 iAttributes = EAddressKernel|EMapTypeGlobal|EPrivate; |
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134 break; |
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135 case EKernelMessage: |
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136 iAttributes = EAddressKernel|EMapTypeGlobal|EPrivate; |
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137 break; |
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138 default: |
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139 FAULT(); |
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140 } |
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141 return KErrNone; |
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142 } |
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143 |
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144 /******************************************** |
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145 * Chunk |
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146 ********************************************/ |
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147 |
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148 DArmPlatChunk::DArmPlatChunk() |
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149 {} |
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150 |
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151 DArmPlatChunk::~DArmPlatChunk() |
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152 { |
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153 DMemModelChunk::Destruct(); |
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154 } |
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155 |
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156 TInt DArmPlatChunk::SetupPermissions() |
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157 { |
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158 Mmu& m=Mmu::Get(); |
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159 if(iChunkType==ESharedKernelSingle || iChunkType==ESharedKernelMultiple || iChunkType==ESharedIo || iChunkType==ESharedKernelMirror) |
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160 { |
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161 // override map attributes for shared kernel chunks |
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162 TUint ma = (iMapAttr &~ EMapAttrAccessMask) | (iChunkType==ESharedKernelMirror?EMapAttrSupRw:EMapAttrUserRw); |
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163 TInt r = m.PdePtePermissions(ma, iPdePermissions, iPtePermissions); |
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164 if (r != KErrNone) |
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165 return r; |
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166 iMapAttr = ma; |
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167 } |
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168 else |
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169 { |
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170 iPtePermissions=m.PtePermissions(iChunkType); |
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171 iPdePermissions=m.PdePermissions(iChunkType,EFalse); |
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172 } |
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173 |
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174 __KTRACE_OPT(KMMU,Kern::Printf("Chunk permissions PTE=%08x PDE=%08x",iPtePermissions,iPdePermissions)); |
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175 return KErrNone; |
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176 } |
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177 |
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178 TIpcExcTrap::TExcLocation TIpcExcTrap::ExcLocation(DThread* aThread, TAny* aContext) |
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179 { |
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180 TArmExcInfo& info=*(TArmExcInfo*)aContext; |
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181 if (info.iExcCode==EArmExceptionDataAbort) |
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182 { |
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183 TLinAddr va=(TLinAddr)info.iFaultAddress; |
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184 |
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185 TLinAddr aliasAddr = ((DMemModelThread*)aThread)->iAliasLinAddr; |
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186 TBool remoteError; |
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187 if(aliasAddr) |
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188 remoteError = TUint(va^aliasAddr)<TUint(KPageSize); |
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189 else |
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190 // The second clause in the statement below was "va < iRemoteBase + iSize". |
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191 // iRemoteBase + iSize might conceivably wrap round. |
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192 // The usual fix for this is to change |
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193 // va >= base && va < base + size |
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194 // to va >= base && (va - base) < size |
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195 // but this requires the first clause (va >= base) so that va-base doesn't wrap negative. |
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196 // Since the first clause in this expression is va >= (iRemoteBase & ~3) |
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197 // we have to re-write the expression as follows: |
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198 // Let base' = iRemoteBase & ~3 |
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199 // so base = base' + (base & 3) |
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200 // then we have va >= base' && va < base' + (base & 3) + iSize |
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201 // (effectively the & ~3 on the first clause extends the range downwards by base & 3) |
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202 remoteError = va>=(iRemoteBase&~3) && |
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203 (va - (iRemoteBase & ~3)) < iSize + (iRemoteBase & 3); |
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204 if (remoteError) |
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205 return EExcRemote; |
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206 |
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207 // Third clause was va < iLocalBase + iSize, fixed as in the "remoteError =" line above |
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208 if (iLocalBase && va>=(iLocalBase&~3) && |
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209 (va - (iLocalBase & ~3)) < iSize + (iLocalBase & 3)) |
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210 return EExcLocal; |
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211 } |
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212 return EExcUnknown; |
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213 } |