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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 // |
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15 |
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16 #include <plat_priv.h> |
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17 #include <kernel/cache.h> |
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18 #include "mm.h" |
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19 #include "mmu.h" |
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20 #include "mrom.h" |
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21 #include "mpager.h" |
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22 #include "mmanager.h" |
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23 #include "mobject.h" |
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24 #include "mmapping.h" |
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25 #include "maddrcont.h" |
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26 #include "mptalloc.h" |
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27 #include "mlargemappings.h" |
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28 |
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29 #include "cache_maintenance.inl" |
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30 |
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31 |
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32 /** |
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33 Class representing the resources allocated for a ROM shadow page. |
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34 |
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35 A shadow page is a page of RAM which is mapped by the MMU to replace |
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36 a prior existing page at a particular virtual address. |
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37 */ |
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38 class DShadowPage : public DVirtualPinMapping |
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39 { |
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40 public: |
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41 /** |
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42 Create a new #DShadowPage to shadow a specified memory page. |
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43 |
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44 On success, #iOriginalPage holds the physical address of the original page |
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45 and #iNewPage the physical address of the newly allocated RAM page; the |
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46 contents of this are a copy of the original. |
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47 |
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48 No MMU entries for the shadow page are changed - it is the responsibility |
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49 of the caller to handle this. However, the new #DShadowPage object will |
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50 have pinned the page table used by \a aMapping which maps the page being |
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51 shadowed, prevent demand paging from discarding any modifications made to |
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52 this. |
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53 |
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54 @param aMemory The memory object whose memory is to be shadowed. |
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55 @param aIndex Page index, within the memory, of the page to shadow. |
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56 @param aMapping A memory mapping which currently maps the page to be |
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57 shadowed. |
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58 |
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59 @return The newly created DShadowPage or the null pointer if there was |
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60 insufficient memory. |
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61 */ |
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62 static DShadowPage* New(DMemoryObject* aMemory, TUint aIndex, DMemoryMappingBase* aMapping); |
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63 |
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64 /** |
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65 Free the allocated shadow page (#iNewPage) and unpin any pages table which |
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66 was pinned, then free this shadow page object. |
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67 |
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68 The called of this function must ensure that all references to the shadow |
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69 RAM page have been removed from any MMU mappings. |
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70 */ |
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71 void Destroy(); |
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72 |
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73 private: |
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74 DShadowPage(); |
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75 ~DShadowPage(); |
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76 |
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77 /** |
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78 Second phase constructor. For arguments, see #New. |
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79 */ |
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80 TInt Construct(DMemoryObject* aMemory, TUint aIndex, DMemoryMappingBase* aMapping); |
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81 |
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82 public: |
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83 /** |
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84 The physical address of the original page being shadowed. |
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85 */ |
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86 TPhysAddr iOriginalPage; |
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87 |
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88 /** |
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89 The physical address of the allocated shadow page. |
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90 */ |
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91 TPhysAddr iNewPage; |
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92 }; |
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93 |
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94 |
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95 /** |
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96 Specialised manager for the memory object representing the system ROM. |
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97 This handles demand paging of the ROM contents if it is not stored in a memory |
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98 device capable of execute-in-place random access. E.g. when stored in NAND |
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99 flash. |
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100 */ |
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101 class DRomMemoryManager : public DPagedMemoryManager |
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102 { |
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103 public: |
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104 DRomMemoryManager(); |
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105 |
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106 /** |
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107 Allocate a shadow page for the specified ROM address. |
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108 |
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109 Shadow pages are pages of RAM which are mapped by the MMU so that |
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110 they replace the original ROM memory. The contents of a shadow page |
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111 are initially the same as the ROM they replace, but may be modified with |
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112 #CopyToShadowMemory. |
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113 |
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114 @param aRomAddr An virtual address which lies within the ROM. |
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115 |
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116 @return KErrNone if successful, |
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117 KErrAlreadyExists if the specified address already has a show page, |
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118 otherwise one of the system wide error codes. |
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119 */ |
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120 TInt AllocShadowPage(TLinAddr aRomAddr); |
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121 |
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122 /** |
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123 Free a shadow page previously allocated with #AllocShadowPage. |
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124 |
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125 The original ROM memory page is again mapped at the specified address. |
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126 |
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127 @param aRomAddr An virtual address which lies within the ROM. |
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128 |
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129 @return KErrNone if successful, |
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130 otherwise one of the system wide error codes. |
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131 */ |
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132 TInt FreeShadowPage(TLinAddr aRomAddr); |
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133 |
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134 /** |
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135 Copy data into a shadow page, modifying its contents. |
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136 |
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137 @param aDst An virtual address which lies within the ROM for which a shadow |
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138 page has previously been allocated with #AllocShadowPage. |
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139 @param aSrc The start address of the data to copy to \a aDst. |
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140 @param aSize The size, in bytes, of the data to copy. |
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141 |
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142 @return KErrNone if successful, |
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143 KErrNotFound if the specified address didn't have a shadow page, |
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144 otherwise one of the system wide error codes. |
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145 */ |
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146 TInt CopyToShadowMemory(TLinAddr aDst, TLinAddr aSrc, TUint32 aSize); |
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147 |
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148 protected: |
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149 |
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150 // from DPagedMemoryManager... |
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151 virtual TInt PageInPinnedDone(DMemoryObject* aMemory, TUint aIndex, SPageInfo* aPageInfo, TPhysAddr* aPageArrayEntry, TPinArgs& aPinArgs); |
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152 |
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153 private: |
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154 // from DMemoryManager... |
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155 virtual void Destruct(DMemoryObject* aMemory); |
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156 virtual TInt HandleFault( DMemoryObject* aMemory, TUint aIndex, DMemoryMapping* aMapping, |
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157 TUint aMapInstanceCount, TUint aAccessPermissions); |
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158 virtual TInt Pin(DMemoryObject* aMemory, DMemoryMappingBase* aMapping, TPinArgs& aPinArgs); |
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159 virtual void Unpin(DMemoryObject* aMemory, DMemoryMappingBase* aMapping, TPinArgs& aPinArgs); |
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160 |
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161 // methods inherited from DPagedMemoryManager |
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162 |
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163 /** |
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164 @copydoc DPagedMemoryManager::Init3 |
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165 This acts as a second phase constructor for the manager which |
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166 creates the memory objects and mappings to represent the ROM. |
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167 */ |
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168 virtual void Init3(); |
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169 |
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170 virtual TInt InstallPagingDevice(DPagingDevice* aDevice); |
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171 virtual TInt AcquirePageReadRequest(DPageReadRequest*& aRequest, DMemoryObject* aMemory, TUint aIndex, TUint aCount); |
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172 virtual TInt ReadPages(DMemoryObject* aMemory, TUint aIndex, TUint aCount, TPhysAddr* aPages, DPageReadRequest* aRequest); |
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173 virtual TBool IsAllocated(DMemoryObject* aMemory, TUint aIndex, TUint aCount); |
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174 virtual void DoUnpin(DMemoryObject* aMemory, TUint aIndex, TUint aCount, DMemoryMappingBase* aMapping, TPinArgs& aPinArgs); |
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175 |
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176 /** |
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177 Acquire the mutex used to protect shadow page allocation. |
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178 */ |
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179 void ShadowLock(); |
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180 |
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181 /** |
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182 Release the mutex used to protect shadow page allocation. |
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183 */ |
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184 void ShadowUnlock(); |
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185 |
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186 private: |
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187 /** |
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188 The ROM paging device which was passed to #InstallPagingDevice. |
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189 */ |
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190 DPagingDevice* iDevice; |
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191 |
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192 /** |
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193 The memory object containing the ROM. |
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194 */ |
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195 DMemoryObject* iRomMemory; |
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196 |
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197 /** |
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198 The memory mapping which maps the ROM into a global visible virtual address. |
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199 */ |
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200 DMemoryMapping* iRomMapping; |
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201 |
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202 /** |
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203 The virtual address for the start of the ROM in the global memory region. |
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204 */ |
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205 TLinAddr iBase; |
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206 |
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207 /** |
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208 The size, in bytes, of the ROM image. |
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209 This may not be an exact multiple of a page size. |
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210 */ |
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211 TUint iSize; |
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212 |
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213 /** |
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214 The size, in pages, of the ROM image. |
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215 */ |
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216 TUint iSizeInPages; |
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217 |
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218 /** |
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219 The offset from the ROM start, in bytes, for the region of the |
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220 ROM which is demand paged. |
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221 */ |
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222 TUint iPagedStart; |
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223 |
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224 /** |
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225 The size, in bytes, for the region of the ROM which is demand paged. |
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226 */ |
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227 TUint iPagedSize; |
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228 |
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229 /** |
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230 The address within the ROM for the ROM page index. |
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231 @see TRomHeader::iRomPageIndex. |
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232 */ |
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233 SRomPageInfo* iRomPageIndex; |
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234 |
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235 /** |
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236 The mutex used to protect shadow page allocation. |
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237 */ |
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238 DMutex* iShadowLock; |
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239 |
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240 /** |
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241 Container for all allocated DShadowPage objects. |
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242 */ |
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243 RAddressedContainer iShadowPages; |
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244 |
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245 #ifdef __SUPPORT_DEMAND_PAGING_EMULATION__ |
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246 TInt iOriginalRomPageCount; |
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247 TPhysAddr* iOriginalRomPages; |
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248 friend void RomOriginalPages(TPhysAddr*& aPages, TUint& aPageCount); |
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249 #endif |
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250 |
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251 friend TBool IsUnpagedRom(TLinAddr aBase, TUint aSize); |
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252 |
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253 public: |
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254 /** |
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255 The single instance of this manager class. |
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256 */ |
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257 static DRomMemoryManager TheManager; |
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258 }; |
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259 |
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260 |
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261 DRomMemoryManager DRomMemoryManager::TheManager; |
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262 DPagedMemoryManager* TheRomMemoryManager = &DRomMemoryManager::TheManager; |
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263 |
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264 |
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265 const TInt KMutexOrdRomMemory = KMutexOrdPageIn+1; |
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266 |
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267 |
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268 #ifdef __SUPPORT_DEMAND_PAGING_EMULATION__ |
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269 /** |
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270 For use by the emulated paging device to get the location and size of the ROM. |
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271 |
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272 @param aPages A reference to store a pointer to an array of the physical addresses of each ROM page. |
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273 @param aPageCount A reference to store the number of rom pages. |
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274 */ |
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275 void RomOriginalPages(TPhysAddr*& aPages, TUint& aPageCount) |
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276 { |
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277 aPages = DRomMemoryManager::TheManager.iOriginalRomPages; |
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278 aPageCount = DRomMemoryManager::TheManager.iOriginalRomPageCount; |
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279 } |
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280 |
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281 #endif |
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282 |
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283 |
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284 TBool IsUnpagedRom(TLinAddr aBase, TUint aSize) |
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285 { |
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286 TUint offset = aBase-DRomMemoryManager::TheManager.iBase; |
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287 TUint limit = DRomMemoryManager::TheManager.iPagedStart; |
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288 if(offset>=limit) |
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289 return false; |
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290 offset += aSize; |
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291 if(offset>limit || offset<aSize) |
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292 return false; |
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293 return true; |
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294 } |
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295 |
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296 |
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297 TInt PagifyChunk(TLinAddr aAddress) |
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298 { |
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299 TRACE(("PagifyChunk(0x%08x)",aAddress)); |
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300 |
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301 aAddress &= ~KChunkMask; |
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302 TPde* pPde = Mmu::PageDirectoryEntry(KKernelOsAsid,aAddress); |
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303 |
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304 retry: |
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305 // check there is actually some memory mapped... |
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306 TPde pde = *pPde; |
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307 if(pde==KPdeUnallocatedEntry) |
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308 { |
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309 TRACE(("PagifyChunk returns %d",KErrNotFound)); |
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310 return KErrNotFound; |
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311 } |
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312 |
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313 // end if memory is not a section mapping... |
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314 TPhysAddr pdePhys = Mmu::PdePhysAddr(pde); |
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315 if(pdePhys==KPhysAddrInvalid) |
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316 { |
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317 TRACE(("PagifyChunk returns %d",KErrAlreadyExists)); |
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318 return KErrAlreadyExists; |
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319 } |
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320 |
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321 // get a new page table... |
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322 ::PageTables.Lock(); |
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323 TPte* pt = ::PageTables.Alloc(false); |
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324 if(!pt) |
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325 { |
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326 TRACE(("PagifyChunk returns %d",KErrNoMemory)); |
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327 ::PageTables.Unlock(); |
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328 return KErrNoMemory; |
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329 } |
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330 |
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331 // fill page table so it maps the same physical addresses as the section mapping... |
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332 TPte pte = Mmu::SectionToPageEntry(pde); |
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333 pte |= pdePhys; |
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334 TPte* pPte = pt; |
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335 do |
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336 { |
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337 TRACE2(("!PTE %x=%x",pPte,pte)); |
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338 *pPte++ = pte; |
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339 pte += KPageSize; |
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340 } |
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341 while(TLinAddr(pPte)&(KPageTableMask/sizeof(TPte)*sizeof(TPte))); |
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342 CacheMaintenance::MultiplePtesUpdated((TLinAddr)pt,KPageTableSize); |
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343 |
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344 // check memory not changed... |
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345 MmuLock::Lock(); |
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346 if(Mmu::PdePhysAddr(*pPde)!=pdePhys) |
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347 { |
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348 // pde was changed whilst we were creating a new page table, need to retry... |
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349 MmuLock::Unlock(); |
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350 ::PageTables.Free(pt); |
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351 ::PageTables.Unlock(); |
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352 goto retry; |
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353 } |
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354 |
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355 // update page counts... |
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356 SPageTableInfo* pti = SPageTableInfo::FromPtPtr(pt); |
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357 TUint count = pti->IncPageCount(KPageTableSize/sizeof(TPte)); |
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358 (void)count; |
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359 TRACE2(("pt %x page count=%d",pt,pti->PageCount())); |
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360 __NK_ASSERT_DEBUG(pti->CheckPageCount()); |
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361 |
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362 // swap pde entry to point to new page table... |
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363 pde |= Mmu::PageTablePhysAddr(pt); |
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364 TRACE2(("!PDE %x=%x",pPde,pde)); |
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365 *pPde = pde; |
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366 SinglePdeUpdated(pPde); |
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367 InvalidateTLB(); |
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368 |
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369 // done... |
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370 MmuLock::Unlock(); |
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371 ::PageTables.Unlock(); |
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372 TRACE(("PagifyChunk returns %d",KErrNone)); |
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373 return KErrNone; |
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374 } |
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375 |
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376 |
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377 void UnmapROM(TLinAddr aStart, TLinAddr aEnd) |
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378 { |
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379 TRACEB(("UnmapROM 0x%08x..0x%08x",aStart,aEnd)); |
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380 |
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381 TLinAddr p = aStart; |
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382 if(p>=aEnd) |
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383 return; |
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384 |
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385 PagifyChunk(p); |
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386 |
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387 MmuLock::Lock(); // hold MmuLock for long time, shouldn't matter as this is only done during boot |
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388 |
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389 TPte* pPte = Mmu::PtePtrFromLinAddr(p,KKernelOsAsid); |
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390 __NK_ASSERT_ALWAYS(pPte); |
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391 while(p<aEnd && p&KChunkMask) |
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392 { |
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393 *pPte++ = KPteUnallocatedEntry; |
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394 p += KPageSize; |
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395 } |
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396 |
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397 if(p<aEnd) |
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398 { |
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399 TPde* pPde = Mmu::PageDirectoryEntry(KKernelOsAsid,p); |
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400 while(p<aEnd) |
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401 { |
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402 *pPde++ = KPdeUnallocatedEntry; |
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403 p += KChunkSize; |
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404 } |
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405 } |
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406 |
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407 MmuLock::Unlock(); |
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408 |
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409 __NK_ASSERT_DEBUG(p==aEnd); |
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410 } |
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411 |
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412 |
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413 DRomMemoryManager::DRomMemoryManager() |
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414 : iShadowPages(0,iShadowLock) |
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415 { |
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416 } |
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417 |
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418 |
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419 void DRomMemoryManager::Init3() |
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420 { |
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421 // get ROM info... |
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422 const TRomHeader& romHeader = TheRomHeader(); |
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423 iBase = (TLinAddr)&romHeader; |
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424 iSize = romHeader.iUncompressedSize; |
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425 iSizeInPages = MM::RoundToPageCount(iSize); |
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426 TUint chunkSize = ((iSize+KChunkMask)&~KChunkMask); |
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427 TUint committedSize = TheSuperPage().iTotalRomSize; // size of memory loaded by bootstrap |
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428 TRACEB(("DRomMemoryManager::Init3 rom=0x%08x+0x%x",iBase,iSize)); |
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429 |
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430 // get paged rom info... |
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431 if(romHeader.iRomPageIndex) |
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432 iRomPageIndex = (SRomPageInfo*)((TInt)&romHeader+romHeader.iRomPageIndex); |
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433 iPagedSize = romHeader.iPageableRomSize; |
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434 iPagedStart = iPagedSize ? romHeader.iPageableRomStart : 0; |
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435 if(iPagedStart) |
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436 { |
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437 TRACEB(("DRomMemoryManager::Init3() paged=0x%08x+0x%x",(TLinAddr)&romHeader+iPagedStart,iPagedSize)); |
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438 __NK_ASSERT_ALWAYS(iPagedStart<iSize && iPagedStart+iPagedSize>iPagedStart && iPagedStart+iPagedSize<=iSize); |
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439 |
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440 #ifdef __SUPPORT_DEMAND_PAGING_EMULATION__ |
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441 // get physical addresses of ROM pages... |
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442 iOriginalRomPageCount = iSizeInPages; |
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443 iOriginalRomPages = new TPhysAddr[iOriginalRomPageCount]; |
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444 __NK_ASSERT_ALWAYS(iOriginalRomPages); |
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445 MmuLock::Lock(); // hold MmuLock for long time, shouldn't matter as this is only done during boot |
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446 TInt i; |
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447 for(i=0; i<iOriginalRomPageCount; i++) |
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448 iOriginalRomPages[i] = Mmu::LinearToPhysical(iBase+i*KPageSize); |
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449 MmuLock::Unlock(); |
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450 |
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451 // unmap paged part of ROM as the bootstrap will have left it mapped. |
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452 // See CFG_SupportEmulatedRomPaging in the bootstrap code. |
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453 // todo: use FMM for this after memory object created |
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454 UnmapROM(iBase+iPagedStart,iBase+chunkSize); |
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455 committedSize = iPagedStart; |
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456 #endif |
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457 } |
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458 |
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459 if(iPagedStart && committedSize!=iPagedStart) |
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460 { |
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461 // unmap any paged ROM which the bootstrap mapped... |
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462 TRACEB(("DRomMemoryManager::Init3() unmapping unpaged ROM offsets 0x%x thru 0x%x",iPagedStart,committedSize)); |
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463 // todo: use FMM for this after memory object created |
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464 UnmapROM(iBase+iPagedStart,iBase+committedSize); |
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465 committedSize = iPagedStart; |
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466 } |
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467 |
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468 // create memory object for ROM... |
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469 TRACEB(("DRomMemoryManager::Init3() committed ROM memory 0x%x of 0x%x",committedSize,chunkSize)); |
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470 TMemoryCreateFlags flags = (TMemoryCreateFlags)(EMemoryCreateNoWipe | EMemoryCreateReadOnly | |
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471 EMemoryCreateDemandPaged | EMemoryCreateAllowExecution); |
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472 iRomMemory = DLargeMappedMemory::New(&DRomMemoryManager::TheManager,chunkSize>>KPageShift,EMemoryAttributeStandard,flags); |
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473 __NK_ASSERT_ALWAYS(iRomMemory); |
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474 TInt r = MM::MemoryClaimInitialPages(iRomMemory,iBase,committedSize,EUserExecute,false,true); |
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475 __NK_ASSERT_ALWAYS(r==KErrNone); |
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476 r = iRomMemory->iPages.Alloc(committedSize>>KPageShift,(chunkSize-committedSize)>>KPageShift); |
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477 __NK_ASSERT_ALWAYS(r==KErrNone); |
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478 |
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479 // create mapping for ROM... |
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480 r = MM::MappingNew(iRomMapping, iRomMemory, EUserExecute, KKernelOsAsid, EMappingCreateExactVirtual, iBase); |
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481 __NK_ASSERT_ALWAYS(r==KErrNone); |
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482 __NK_ASSERT_ALWAYS(iRomMapping->IsLarge()); |
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483 |
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484 // Set the paging device to be uninstalled, i.e. NULL. |
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485 iDevice = NULL; |
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486 |
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487 _LIT(KRomMemoryLockName,"RomMemory"); |
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488 r = K::MutexCreate(iShadowLock, KRomMemoryLockName, NULL, EFalse, KMutexOrdRomMemory); |
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489 __NK_ASSERT_ALWAYS(r==KErrNone); |
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490 MM::MemorySetLock(iRomMemory,iShadowLock); |
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491 } |
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492 |
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493 |
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494 TInt DRomMemoryManager::InstallPagingDevice(DPagingDevice* aDevice) |
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495 { |
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496 TRACEB(("DRomMemoryManager::InstallPagingDevice(0x%08x)",aDevice)); |
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497 |
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498 if(!iPagedStart) |
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499 { |
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500 TRACEB(("ROM is not paged")); |
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501 return KErrNone; |
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502 } |
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503 |
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504 TAny* null = 0; |
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505 if(!__e32_atomic_cas_ord_ptr(&iDevice, &null, aDevice)) // set iDevice=aDevice if it was originally 0 |
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506 { |
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507 // ROM paging device already registered... |
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508 TRACEB(("DRomMemoryManager::InstallPagingDevice returns ALREADY EXISTS!")); |
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509 return KErrAlreadyExists; |
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510 } |
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511 |
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512 __e32_atomic_ior_ord32(&K::MemModelAttributes, (TUint32)EMemModelAttrRomPaging); |
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513 |
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514 return KErrNone; |
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515 } |
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516 |
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517 |
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518 TInt DRomMemoryManager::AcquirePageReadRequest(DPageReadRequest*& aRequest, DMemoryObject* aMemory, TUint aIndex, TUint aCount) |
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519 { |
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520 aRequest = iDevice->iRequestPool->AcquirePageReadRequest(aMemory,aIndex,aCount); |
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521 return KErrNone; |
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522 } |
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523 |
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524 |
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525 void DRomMemoryManager::Destruct(DMemoryObject* aMemory) |
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526 { |
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527 __NK_ASSERT_DEBUG(0); |
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528 } |
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529 |
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530 |
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531 TInt DRomMemoryManager::ReadPages(DMemoryObject* aMemory, TUint aIndex, TUint aCount, TPhysAddr* aPages, DPageReadRequest* aRequest) |
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532 { |
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533 __NK_ASSERT_DEBUG(aRequest->CheckUse(aMemory,aIndex,aCount)); |
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534 |
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535 TLinAddr linAddr = aRequest->MapPages(aIndex,aCount,aPages); |
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536 TInt r = KErrNone; |
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537 |
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538 const TInt readUnitShift = iDevice->iReadUnitShift; |
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539 |
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540 for(; aCount; ++aIndex, --aCount, linAddr+=KPageSize) |
|
541 { |
|
542 START_PAGING_BENCHMARK; |
|
543 if(!iRomPageIndex) |
|
544 { |
|
545 // ROM not broken into pages, so just read it in directly. |
|
546 // KPageShift > readUnitShift so page size is exact multiple of read |
|
547 // units. Therefore it is ok to just shift offset and KPageSize |
|
548 // by readUnitShift. |
|
549 const TInt dataOffset = aIndex << KPageShift; |
|
550 START_PAGING_BENCHMARK; |
|
551 r = iDevice->Read( const_cast<TThreadMessage*>(&aRequest->iMessage), |
|
552 linAddr, dataOffset >> readUnitShift, |
|
553 KPageSize >> readUnitShift, DPagingDevice::EDriveRomPaging); |
|
554 __NK_ASSERT_DEBUG(r!=KErrNoMemory); // not allowed to allocated memory, therefore can't fail with KErrNoMemory |
|
555 END_PAGING_BENCHMARK(EPagingBmReadMedia); |
|
556 } |
|
557 else |
|
558 { |
|
559 // Work out where data for page is located |
|
560 SRomPageInfo* romPageInfo = iRomPageIndex + aIndex; |
|
561 const TInt dataOffset = romPageInfo->iDataStart; |
|
562 const TInt dataSize = romPageInfo->iDataSize; |
|
563 if(!dataSize) |
|
564 { |
|
565 // empty page, fill it with 0xff... |
|
566 memset((TAny*)linAddr, 0xff, KPageSize); |
|
567 r = KErrNone; |
|
568 } |
|
569 else |
|
570 { |
|
571 __NK_ASSERT_ALWAYS(romPageInfo->iPagingAttributes & SRomPageInfo::EPageable); |
|
572 |
|
573 // Read data for page... |
|
574 TThreadMessage* msg = const_cast<TThreadMessage*>(&aRequest->iMessage); |
|
575 const TLinAddr buffer = aRequest->iBuffer; |
|
576 const TUint readStart = dataOffset >> readUnitShift; |
|
577 const TUint readSize = ((dataOffset + dataSize - 1) >> readUnitShift) - readStart + 1; |
|
578 __NK_ASSERT_DEBUG((readSize << readUnitShift) <= (DPageReadRequest::EMaxPages << KPageShift)); |
|
579 START_PAGING_BENCHMARK; |
|
580 r = iDevice->Read(msg, buffer, readStart, readSize, DPagingDevice::EDriveRomPaging); |
|
581 __NK_ASSERT_DEBUG(r!=KErrNoMemory); // not allowed to allocated memory, therefore can't fail with KErrNoMemory |
|
582 END_PAGING_BENCHMARK(EPagingBmReadMedia); |
|
583 if(r==KErrNone) |
|
584 { |
|
585 // Decompress data, remembering that the data to decompress may be offset from |
|
586 // the start of the data just read in, due to reads having to be aligned by |
|
587 // readUnitShift. |
|
588 const TLinAddr data = buffer + dataOffset - (readStart << readUnitShift); |
|
589 __ASSERT_COMPILE(SRomPageInfo::ENoCompression==0); // decompress assumes this |
|
590 r = Decompress(romPageInfo->iCompressionType, linAddr, KPageSize, data, dataSize); |
|
591 if(r >= 0) |
|
592 { |
|
593 if (r != KPageSize) |
|
594 __KTRACE_OPT(KPANIC, Kern::Printf("DRomMemoryManager::ReadPage: error decompressing page at %08x + %x: %d", dataOffset, dataSize, r)); |
|
595 __NK_ASSERT_ALWAYS(r == KPageSize); |
|
596 r = KErrNone; |
|
597 } |
|
598 } |
|
599 else |
|
600 __KTRACE_OPT(KPANIC, Kern::Printf("DRomMemoryManager::ReadPage: error reading media at %08x + %x: %d", dataOffset, dataSize, r)); |
|
601 } |
|
602 } |
|
603 END_PAGING_BENCHMARK(EPagingBmReadRomPage); |
|
604 |
|
605 if(r!=KErrNone) |
|
606 break; |
|
607 } |
|
608 |
|
609 aRequest->UnmapPages(true); |
|
610 |
|
611 return r; |
|
612 } |
|
613 |
|
614 |
|
615 TBool DRomMemoryManager::IsAllocated(DMemoryObject* aMemory, TUint aIndex, TUint aCount) |
|
616 { |
|
617 // all pages in the ROM memory object are always allocated... |
|
618 return true; |
|
619 } |
|
620 |
|
621 |
|
622 TInt DRomMemoryManager::HandleFault(DMemoryObject* aMemory, TUint aIndex, DMemoryMapping* aMapping, |
|
623 TUint aMapInstanceCount, TUint aAccessPermissions) |
|
624 { |
|
625 __NK_ASSERT_DEBUG(aMemory==iRomMemory); |
|
626 |
|
627 TUint offset = aIndex*KPageSize; |
|
628 if(offset<iPagedStart || offset>=iPagedStart+iPagedSize) |
|
629 return KErrAbort; |
|
630 |
|
631 return DPagedMemoryManager::HandleFault(aMemory, aIndex, aMapping, aMapInstanceCount, aAccessPermissions); |
|
632 } |
|
633 |
|
634 |
|
635 TInt DRomMemoryManager::Pin(DMemoryObject* aMemory, DMemoryMappingBase* aMapping, TPinArgs& aPinArgs) |
|
636 { |
|
637 TRACE(("DRomMemoryManager::Pin %08x %08x", aMemory, aMapping)); |
|
638 TUint index = aMapping->iStartIndex; |
|
639 TUint endIndex = index+aMapping->iSizeInPages; |
|
640 if(endIndex>iSizeInPages) |
|
641 return KErrNotFound; |
|
642 |
|
643 TInt r = KErrNone; |
|
644 TUint pagedIndex = iPagedStart>>KPageShift; |
|
645 if(pagedIndex && pagedIndex<endIndex) |
|
646 { |
|
647 TUint start = index; |
|
648 if(start<pagedIndex) |
|
649 start = pagedIndex; |
|
650 r = DoPin(aMemory,start,endIndex-start,aMapping,aPinArgs); |
|
651 } |
|
652 |
|
653 return r; |
|
654 } |
|
655 |
|
656 |
|
657 TInt DRomMemoryManager::PageInPinnedDone(DMemoryObject* aMemory, TUint aIndex, SPageInfo* aPageInfo, TPhysAddr* aPageArrayEntry, TPinArgs& aPinArgs) |
|
658 { |
|
659 TRACE(("DRomMemoryManager::PageInPinnedDone %08x %d", aMemory, aIndex)); |
|
660 |
|
661 // Only the paged part of rom should be pinned. |
|
662 __NK_ASSERT_DEBUG(aIndex >= iPagedStart >> KPageShift); |
|
663 |
|
664 TInt r = DoPageInDone(aMemory,aIndex,aPageInfo,aPageArrayEntry,true); |
|
665 |
|
666 // Rom page can't be decommitted so this must succeed. |
|
667 __NK_ASSERT_DEBUG(r >= 0); |
|
668 |
|
669 if (aPageInfo->Type() == SPageInfo::EShadow) |
|
670 {// The page is being shadowed so pin the original page. |
|
671 // This is safe as the original page was physically pinned when shadowed. |
|
672 __NK_ASSERT_DEBUG(RPageArray::IsPresent(*aPageArrayEntry)); |
|
673 aPageInfo = aPageInfo->GetOriginalPage(); |
|
674 } |
|
675 |
|
676 ThePager.PagedInPinned(aPageInfo,aPinArgs); |
|
677 |
|
678 // check page assigned correctly... |
|
679 #ifdef _DEBUG |
|
680 if(RPageArray::IsPresent(*aPageArrayEntry)) |
|
681 { |
|
682 SPageInfo* pi = SPageInfo::FromPhysAddr(*aPageArrayEntry); |
|
683 if (pi->Type() != SPageInfo::EShadow) |
|
684 { |
|
685 __NK_ASSERT_DEBUG(pi->Type() == SPageInfo::EManaged); |
|
686 __NK_ASSERT_DEBUG(pi->Owner()==aMemory); |
|
687 __NK_ASSERT_DEBUG(pi->Index()==aIndex); |
|
688 __NK_ASSERT_DEBUG(pi->PagedState()==SPageInfo::EPagedPinned); |
|
689 } |
|
690 } |
|
691 #endif |
|
692 return r; |
|
693 } |
|
694 |
|
695 |
|
696 void DRomMemoryManager::Unpin(DMemoryObject* aMemory, DMemoryMappingBase* aMapping, TPinArgs& aPinArgs) |
|
697 { |
|
698 TRACE(("DRomMemoryManager::Unpin %08x %08x", aMemory, aMapping)); |
|
699 |
|
700 __ASSERT_CRITICAL; |
|
701 TUint index = aMapping->iStartIndex; |
|
702 TUint endIndex = index+aMapping->iSizeInPages; |
|
703 __NK_ASSERT_DEBUG(endIndex<=iSizeInPages); // Pin() should have already ensured this |
|
704 |
|
705 TUint pagedIndex = iPagedStart>>KPageShift; |
|
706 if(pagedIndex && pagedIndex<endIndex) |
|
707 { |
|
708 TUint start = index; |
|
709 if(start<pagedIndex) |
|
710 start = pagedIndex; |
|
711 // unpin pages (but only if they were successfully pinned)... |
|
712 if(aMapping->Flags()&DMemoryMapping::EPagesPinned) |
|
713 DoUnpin(aMemory,start,endIndex-start,aMapping,aPinArgs); |
|
714 } |
|
715 |
|
716 __NK_ASSERT_DEBUG((aMapping->Flags()&DMemoryMapping::EPageUnmapVetoed)==0); // we shouldn't have tried to Free paged ROM |
|
717 } |
|
718 |
|
719 |
|
720 void DRomMemoryManager::DoUnpin(DMemoryObject* aMemory, TUint aIndex, TUint aCount, DMemoryMappingBase* aMapping, TPinArgs& aPinArgs) |
|
721 { |
|
722 TRACE(("DRomMemoryManager::DoUnpin(0x%08x,0x%08x,0x%08x,0x%08x,?)",aMemory, aIndex, aCount, aMapping)); |
|
723 |
|
724 // This should only be invoked on the paged part of rom. |
|
725 __NK_ASSERT_DEBUG(iPagedStart && aIndex >= (iPagedStart >> KPageShift)); |
|
726 |
|
727 MmuLock::Lock(); |
|
728 TUint endIndex = aIndex+aCount; |
|
729 for(TUint i = aIndex; i < endIndex; ++i) |
|
730 { |
|
731 TPhysAddr page = aMemory->iPages.Page(i); |
|
732 __NK_ASSERT_DEBUG(RPageArray::IsPresent(page)); |
|
733 SPageInfo* pi = SPageInfo::FromPhysAddr(page); |
|
734 if(pi->Type() == SPageInfo::EShadow) |
|
735 { |
|
736 pi = pi->GetOriginalPage(); |
|
737 } |
|
738 ThePager.Unpin(pi,aPinArgs); |
|
739 MmuLock::Flash(); |
|
740 } |
|
741 |
|
742 MmuLock::Unlock(); |
|
743 |
|
744 // clear EPagesPinned flag... |
|
745 __e32_atomic_and_ord8(&aMapping->Flags(), TUint8(~DMemoryMapping::EPagesPinned)); |
|
746 } |
|
747 |
|
748 |
|
749 void DRomMemoryManager::ShadowLock() |
|
750 { |
|
751 MM::MemoryLock(iRomMemory); |
|
752 } |
|
753 |
|
754 |
|
755 void DRomMemoryManager::ShadowUnlock() |
|
756 { |
|
757 MM::MemoryUnlock(iRomMemory); |
|
758 } |
|
759 |
|
760 |
|
761 TInt DRomMemoryManager::AllocShadowPage(TLinAddr aRomAddr) |
|
762 { |
|
763 TRACE(("DRomMemoryManager::AllocShadowPage %08x", aRomAddr)); |
|
764 |
|
765 TUint index = (aRomAddr-iBase)>>KPageShift; |
|
766 if (index >= iSizeInPages) |
|
767 return KErrArgument; |
|
768 __NK_ASSERT_DEBUG(iRomMemory->CheckRegion(index,1)); |
|
769 |
|
770 TInt r; |
|
771 |
|
772 ShadowLock(); |
|
773 |
|
774 DShadowPage* shadow = (DShadowPage*)iShadowPages.Find(index); |
|
775 if(shadow) |
|
776 r = KErrAlreadyExists; |
|
777 else |
|
778 { |
|
779 shadow = DShadowPage::New(iRomMemory,index,iRomMapping); |
|
780 if(!shadow) |
|
781 r = KErrNoMemory; |
|
782 else |
|
783 { |
|
784 r = iShadowPages.Add(index,shadow); |
|
785 if(r!=KErrNone) |
|
786 { |
|
787 shadow->Destroy(); |
|
788 } |
|
789 else |
|
790 { |
|
791 // Remap the shadowed rom page to the shadow page. Update the |
|
792 // page array entry for the page being shadowed, this ensures |
|
793 // that any page moving attempts will remap the shadow page when |
|
794 // they realise that the page is physically pinned. |
|
795 MmuLock::Lock(); |
|
796 TPhysAddr& pageEntry = *iRomMemory->iPages.PageEntry(index); |
|
797 TPhysAddr newPageAddr = shadow->iNewPage; |
|
798 pageEntry = (pageEntry & KPageMask) | newPageAddr; |
|
799 |
|
800 // Mark the SPageInfo of the shadow page with pointer to the original page's |
|
801 // SPageInfo, this is safe as we've physically pinned the original page |
|
802 // so it can't be freed or reused until this shadow page is destroyed. |
|
803 SPageInfo* origPi = SPageInfo::FromPhysAddr(shadow->iOriginalPage); |
|
804 SPageInfo* newPi = SPageInfo::FromPhysAddr(newPageAddr); |
|
805 newPi->SetOriginalPage(origPi); |
|
806 MmuLock::Unlock(); |
|
807 |
|
808 iRomMemory->RemapPage(pageEntry, index, ETrue); |
|
809 } |
|
810 } |
|
811 } |
|
812 |
|
813 ShadowUnlock(); |
|
814 |
|
815 return r; |
|
816 } |
|
817 |
|
818 |
|
819 TInt DRomMemoryManager::FreeShadowPage(TLinAddr aRomAddr) |
|
820 { |
|
821 TUint index = (aRomAddr-iBase)>>KPageShift; |
|
822 if(!iRomMemory->CheckRegion(index,1)) |
|
823 return KErrArgument; |
|
824 |
|
825 TInt r; |
|
826 |
|
827 ShadowLock(); |
|
828 |
|
829 DShadowPage* shadow = (DShadowPage*)iShadowPages.Remove(index); |
|
830 if(!shadow) |
|
831 { |
|
832 r = KErrNotFound; |
|
833 } |
|
834 else |
|
835 { |
|
836 // Remap the rom page and update the page array entry for the page |
|
837 // back to the original rom page. This is safe as the page is physically |
|
838 // pinned until shadow is destroyed. |
|
839 MmuLock::Lock(); |
|
840 TPhysAddr& pageEntry = *iRomMemory->iPages.PageEntry(index); |
|
841 pageEntry = (pageEntry & KPageMask) | shadow->iOriginalPage; |
|
842 MmuLock::Unlock(); |
|
843 |
|
844 iRomMemory->RemapPage(pageEntry, index, ETrue); |
|
845 |
|
846 shadow->Destroy(); |
|
847 r = KErrNone; |
|
848 } |
|
849 |
|
850 ShadowUnlock(); |
|
851 |
|
852 return r; |
|
853 } |
|
854 |
|
855 |
|
856 TInt DRomMemoryManager::CopyToShadowMemory(TLinAddr aDst, TLinAddr aSrc, TUint32 aSize) |
|
857 { |
|
858 TRACE(("DRomMemoryManager::CopyToShadowMemory(0x%08x,0x%08x,0x%x)",aDst,aSrc,aSize)); |
|
859 Mmu& m = TheMmu; |
|
860 TLinAddr offset = aDst-iBase; |
|
861 TLinAddr end = offset+aSize; |
|
862 if(end<offset || end>iSize) |
|
863 return KErrArgument; |
|
864 |
|
865 while(aSize) |
|
866 { |
|
867 TUint size = KPageSize-(offset&KPageMask); // bytes left in page at 'offset' |
|
868 if(size>aSize) |
|
869 size = aSize; |
|
870 |
|
871 TInt r; |
|
872 |
|
873 ShadowLock(); |
|
874 |
|
875 DShadowPage* shadow = (DShadowPage*)iShadowPages.Find(offset>>KPageShift); |
|
876 if(!shadow) |
|
877 { |
|
878 r = KErrNotFound; |
|
879 } |
|
880 else |
|
881 { |
|
882 RamAllocLock::Lock(); |
|
883 TLinAddr dst = m.MapTemp(shadow->iNewPage,offset>>KPageShift); |
|
884 dst += offset&KPageMask; |
|
885 memcpy((TAny*)dst,(TAny*)aSrc,size); |
|
886 m.UnmapTemp(); |
|
887 RamAllocLock::Unlock(); |
|
888 |
|
889 r = KErrNone; |
|
890 } |
|
891 |
|
892 ShadowUnlock(); |
|
893 |
|
894 if(r!=KErrNone) |
|
895 return r; |
|
896 |
|
897 offset += size; |
|
898 aSrc += size; |
|
899 aSize -= size; |
|
900 } |
|
901 |
|
902 return KErrNone; |
|
903 } |
|
904 |
|
905 |
|
906 // |
|
907 // DShadowPage |
|
908 // |
|
909 |
|
910 DShadowPage* DShadowPage::New(DMemoryObject* aMemory, TUint aIndex, DMemoryMappingBase* aMapping) |
|
911 { |
|
912 TRACE(("DShadowPage::New(0x%08x,0x%x,0x%08x)",aMemory, aIndex, aMapping)); |
|
913 __NK_ASSERT_DEBUG(MemoryObjectLock::IsHeld(aMemory)); |
|
914 |
|
915 DShadowPage* self = new DShadowPage; |
|
916 if(self) |
|
917 if(self->Construct(aMemory,aIndex,aMapping)!=KErrNone) |
|
918 { |
|
919 self->Destroy(); |
|
920 self = 0; |
|
921 } |
|
922 |
|
923 TRACE(("DShadowPage::New(0x%08x,0x%x,0x%08x) returns 0x%08x",aMemory, aIndex, aMapping, self)); |
|
924 return self; |
|
925 } |
|
926 |
|
927 |
|
928 DShadowPage::DShadowPage() |
|
929 : iOriginalPage(KPhysAddrInvalid), iNewPage(KPhysAddrInvalid) |
|
930 { |
|
931 // Set flag so that the rom page that is being shadowed can't be moved, |
|
932 // otherwise iOriginalPage will become invalid if the page is moved. |
|
933 Flags() |= EPhysicalPinningMapping; |
|
934 } |
|
935 |
|
936 |
|
937 |
|
938 |
|
939 TInt DShadowPage::Construct(DMemoryObject* aMemory, TUint aIndex, DMemoryMappingBase* aMapping) |
|
940 { |
|
941 __NK_ASSERT_DEBUG(MemoryObjectLock::IsHeld(aMemory)); |
|
942 |
|
943 // Pin the page. It is ok to get the mapping instance count here without |
|
944 // MmuLock as there is only one permenant mapping used for the ROM. |
|
945 TInt r = Pin(aMemory,aIndex,1,EUserReadOnly,aMapping,aMapping->MapInstanceCount()); |
|
946 if(r!=KErrNone) |
|
947 return r; |
|
948 |
|
949 r = PhysAddr(0,1,iOriginalPage,0); |
|
950 __NK_ASSERT_DEBUG(r>=0); |
|
951 if(r<0) |
|
952 return r; |
|
953 |
|
954 RamAllocLock::Lock(); |
|
955 |
|
956 Mmu& m = TheMmu; |
|
957 r = m.AllocRam(&iNewPage, 1, aMemory->RamAllocFlags(), EPageFixed); |
|
958 if(r==KErrNone) |
|
959 { |
|
960 TLinAddr dst = m.MapTemp(iNewPage,aIndex,0); |
|
961 TLinAddr src = m.MapTemp(iOriginalPage,aIndex,1); |
|
962 pagecpy((TAny*)dst,(TAny*)src); |
|
963 CacheMaintenance::CodeChanged(dst,KPageSize); // IMB not needed, just clean to PoU (but we don't have a function to do that) |
|
964 |
|
965 m.UnmapTemp(0); |
|
966 m.UnmapTemp(1); |
|
967 MmuLock::Lock(); |
|
968 SPageInfo::FromPhysAddr(iNewPage)->SetShadow(aIndex,aMemory->PageInfoFlags()); |
|
969 MmuLock::Unlock(); |
|
970 } |
|
971 |
|
972 RamAllocLock::Unlock(); |
|
973 |
|
974 if(r!=KErrNone) |
|
975 return r; |
|
976 |
|
977 return r; |
|
978 } |
|
979 |
|
980 |
|
981 DShadowPage::~DShadowPage() |
|
982 { |
|
983 } |
|
984 |
|
985 |
|
986 void DShadowPage::Destroy() |
|
987 { |
|
988 TRACE2(("DShadowPage[%x]::Destroy()",this)); |
|
989 if(iNewPage!=KPhysAddrInvalid) |
|
990 { |
|
991 RamAllocLock::Lock(); |
|
992 TheMmu.FreeRam(&iNewPage, 1, EPageFixed); |
|
993 RamAllocLock::Unlock(); |
|
994 } |
|
995 if(IsAttached()) |
|
996 Unpin(); |
|
997 Close(); |
|
998 } |
|
999 |
|
1000 |
|
1001 /** |
|
1002 Replace a page of the system's execute-in-place (XIP) ROM image with a page of |
|
1003 RAM having the same contents. This RAM can subsequently be written to in order |
|
1004 to apply patches to the XIP ROM or to insert software breakpoints for debugging |
|
1005 purposes. |
|
1006 Call Epoc::FreeShadowPage() when you wish to revert to the original ROM page. |
|
1007 |
|
1008 @param aRomAddr The virtual address of the ROM page to be replaced. |
|
1009 @return KErrNone if the operation completed successfully. |
|
1010 KErrArgument if the specified address is not a valid XIP ROM address. |
|
1011 KErrNoMemory if the operation failed due to insufficient free RAM. |
|
1012 KErrAlreadyExists if the XIP ROM page at the specified address has |
|
1013 already been shadowed by a RAM page. |
|
1014 |
|
1015 @pre Calling thread must be in a critical section. |
|
1016 @pre Interrupts must be enabled. |
|
1017 @pre Kernel must be unlocked. |
|
1018 @pre No fast mutex can be held. |
|
1019 @pre Call in a thread context. |
|
1020 */ |
|
1021 EXPORT_C TInt Epoc::AllocShadowPage(TLinAddr aRomAddr) |
|
1022 { |
|
1023 CHECK_PRECONDITIONS(MASK_THREAD_CRITICAL,"Epoc::AllocShadowPage"); |
|
1024 return DRomMemoryManager::TheManager.AllocShadowPage(aRomAddr); |
|
1025 } |
|
1026 |
|
1027 |
|
1028 /** |
|
1029 Copies data into shadow memory. Source data is presumed to be in Kernel memory. |
|
1030 |
|
1031 @param aSrc Data to copy from. |
|
1032 @param aDest Address to copy into. |
|
1033 @param aLength Number of bytes to copy. Maximum of 32 bytes of data can be copied. |
|
1034 |
|
1035 @return KErrNone if the operation completed successfully. |
|
1036 KErrArgument if any part of destination region is not shadow page or |
|
1037 if aLength is greater then 32 bytes. |
|
1038 |
|
1039 @pre Calling thread must be in a critical section. |
|
1040 @pre Interrupts must be enabled. |
|
1041 @pre Kernel must be unlocked. |
|
1042 @pre No fast mutex can be held. |
|
1043 @pre Call in a thread context. |
|
1044 */ |
|
1045 EXPORT_C TInt Epoc::CopyToShadowMemory(TLinAddr aDest, TLinAddr aSrc, TUint32 aLength) |
|
1046 { |
|
1047 CHECK_PRECONDITIONS(MASK_THREAD_CRITICAL,"Epoc::CopyToShadowMemory"); |
|
1048 return DRomMemoryManager::TheManager.CopyToShadowMemory(aDest,aSrc,aLength); |
|
1049 } |
|
1050 |
|
1051 |
|
1052 /** |
|
1053 Revert an XIP ROM address which has previously been shadowed to the original |
|
1054 page of ROM. |
|
1055 |
|
1056 @param aRomAddr The virtual address of the ROM page to be reverted. |
|
1057 @return KErrNone if the operation completed successfully. |
|
1058 KErrArgument if the specified address is not a valid XIP ROM address. |
|
1059 KErrGeneral if the specified address has not previously been shadowed |
|
1060 using Epoc::AllocShadowPage(). |
|
1061 |
|
1062 @pre Calling thread must be in a critical section. |
|
1063 @pre Interrupts must be enabled. |
|
1064 @pre Kernel must be unlocked. |
|
1065 @pre No fast mutex can be held. |
|
1066 @pre Call in a thread context. |
|
1067 */ |
|
1068 EXPORT_C TInt Epoc::FreeShadowPage(TLinAddr aRomAddr) |
|
1069 { |
|
1070 return DRomMemoryManager::TheManager.FreeShadowPage(aRomAddr); |
|
1071 } |
|
1072 |
|
1073 |
|
1074 /** |
|
1075 Change the permissions on an XIP ROM address which has previously been shadowed |
|
1076 by a RAM page so that the RAM page may no longer be written to. |
|
1077 |
|
1078 Note: Shadow page on the latest platforms (that use the reduced set of access permissions: |
|
1079 arm11mpcore, arm1176, cortex) is implemented with read only permissions. Therefore, calling |
|
1080 this function in not necessary, as shadow page is already created as 'frozen'. |
|
1081 |
|
1082 @param aRomAddr The virtual address of the shadow RAM page to be frozen. |
|
1083 @return KErrNone if the operation completed successfully. |
|
1084 KErrArgument if the specified address is not a valid XIP ROM address. |
|
1085 KErrGeneral if the specified address has not previously been shadowed |
|
1086 using Epoc::AllocShadowPage(). |
|
1087 |
|
1088 @pre Calling thread must be in a critical section. |
|
1089 @pre Interrupts must be enabled. |
|
1090 @pre Kernel must be unlocked. |
|
1091 @pre No fast mutex can be held. |
|
1092 @pre Call in a thread context. |
|
1093 */ |
|
1094 EXPORT_C TInt Epoc::FreezeShadowPage(TLinAddr aRomAddr) |
|
1095 { |
|
1096 // Null operation for flexible memory model... |
|
1097 return KErrNone; |
|
1098 } |
|
1099 |
|
1100 |