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1 // Copyright (c) 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 <memmodel.h> |
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17 #include <ramalloc.h> |
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18 #include "mm.h" |
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19 #include "mmu.h" |
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20 #include "mmanager.h" |
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21 #include "mobject.h" |
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22 #include "mpager.h" |
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23 #include "mmapping.h" |
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24 |
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25 |
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26 TInt M::RamDefragFault(TAny* /*aExceptionInfo*/) |
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27 {// Defag faults are handled by Mmu::HandlePageFault() on the flexible memory model. |
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28 return KErrAbort; |
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29 } |
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30 |
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31 |
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32 EXPORT_C TInt Epoc::MovePhysicalPage(TPhysAddr aOld, TPhysAddr& aNew, TRamDefragPageToMove aPageToMove) |
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33 { |
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34 CHECK_PRECONDITIONS(MASK_THREAD_CRITICAL,"Epoc::MovePhysicalPage"); |
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35 __KTRACE_OPT(KMMU,Kern::Printf("Epoc::MovePhysicalPage() old=%08x pageToMove=%d",aOld,aPageToMove)); |
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36 // Mark aNew as invalid if a page is moved then this will be updated. |
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37 // However, if the page couldn't be moved or is discarded then it must be invalid. |
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38 aNew = KPhysAddrInvalid; |
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39 |
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40 TInt r = KErrNotFound; |
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41 |
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42 switch (aPageToMove) |
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43 { |
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44 case ERamDefragPage_Physical : |
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45 break; |
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46 |
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47 case ERamDefragPage_PageTable : |
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48 { |
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49 // Assume aOld is a linear address in current thread and get the physical |
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50 // address of the page table that maps it and move that. |
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51 TLinAddr linAddr = (TLinAddr) aOld; |
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52 DMemModelThread* thread = (DMemModelThread*)TheCurrentThread; |
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53 // Get the os asid of current thread's process so no need to open reference on it. |
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54 TUint osAsid = ((DMemModelProcess*)thread->iOwningProcess)->OsAsid(); |
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55 TUint offsetInMapping; |
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56 TUint mapInstanceCount; |
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57 DMemoryMapping* mapping = MM::FindMappingInAddressSpace(osAsid,linAddr,1,offsetInMapping,mapInstanceCount); |
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58 if (!mapping) |
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59 return r; |
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60 MmuLock::Lock(); |
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61 TUint memoryIndex = (offsetInMapping >> KPageShift)+ mapping->iStartIndex; |
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62 TPte* pte = mapping->FindPageTable(linAddr, memoryIndex); |
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63 if (mapInstanceCount != mapping->MapInstanceCount() || !pte) |
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64 { |
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65 MmuLock::Unlock(); |
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66 mapping->Close(); |
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67 return r; |
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68 } |
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69 TPhysAddr physAddr = TheMmu.LinearToPhysical((TLinAddr)pte, KKernelOsAsid); |
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70 __NK_ASSERT_DEBUG(physAddr != KPhysAddrInvalid); |
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71 aOld = physAddr; // Have physical address of page table page so move it. |
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72 MmuLock::Unlock(); |
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73 mapping->Close(); |
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74 break; |
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75 } |
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76 |
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77 case ERamDefragPage_PageTableInfo : |
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78 { |
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79 // Assume aOld is a linear address in current thread and get physical |
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80 // address of the page table info of the page table that maps it |
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81 // and move that. |
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82 TLinAddr linAddr = (TLinAddr) aOld; |
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83 DMemModelThread* thread = (DMemModelThread*)TheCurrentThread; |
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84 // Get the os asid of current thread's process so no need to open reference on it. |
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85 TUint osAsid = ((DMemModelProcess*)thread->iOwningProcess)->OsAsid(); |
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86 TUint offsetInMapping; |
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87 TUint mapInstanceCount; |
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88 DMemoryMapping* mapping = MM::FindMappingInAddressSpace(osAsid,linAddr,1,offsetInMapping,mapInstanceCount); |
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89 if (!mapping) |
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90 return r; |
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91 MmuLock::Lock(); |
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92 TUint memoryIndex = (offsetInMapping >> KPageShift)+ mapping->iStartIndex; |
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93 TPte* pte = mapping->FindPageTable(linAddr, memoryIndex); |
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94 if (mapInstanceCount != mapping->MapInstanceCount() || !pte) |
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95 { |
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96 MmuLock::Unlock(); |
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97 mapping->Close(); |
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98 return r; |
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99 } |
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100 |
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101 SPageTableInfo* pti = SPageTableInfo::FromPtPtr(pte); |
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102 TPhysAddr physAddr = TheMmu.LinearToPhysical((TLinAddr)pti, KKernelOsAsid); |
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103 __NK_ASSERT_DEBUG(physAddr != KPhysAddrInvalid); |
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104 aOld = physAddr; // Have physical address of page table info page so move it. |
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105 MmuLock::Unlock(); |
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106 mapping->Close(); |
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107 break; |
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108 } |
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109 |
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110 default : |
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111 r = KErrNotSupported; |
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112 return r; |
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113 } |
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114 |
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115 RamAllocLock::Lock(); |
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116 |
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117 // Move the page to any RAM zone. |
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118 r = M::MovePage(aOld, aNew, KRamZoneInvalidId, EFalse); |
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119 |
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120 RamAllocLock::Unlock(); |
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121 return r; |
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122 } |
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123 |
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124 |
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125 TInt M::MovePage(TPhysAddr aOld, TPhysAddr& aNew, TUint aBlockZoneId, TBool aBlockRest) |
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126 { |
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127 TInt r; |
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128 |
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129 // get memory object corresponding to the page... |
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130 DMemoryObject* memory = 0; |
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131 MmuLock::Lock(); |
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132 SPageInfo* pi = SPageInfo::SafeFromPhysAddr(aOld&~KPageMask); |
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133 if(pi) |
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134 { |
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135 if (pi->PagedState() != SPageInfo::EUnpaged) |
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136 {// The page is paged so let the pager handle it. |
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137 return ThePager.DiscardPage(pi, aBlockZoneId, aBlockRest); |
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138 } |
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139 if (pi->Type()==SPageInfo::EManaged) |
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140 memory = pi->Owner(); |
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141 } |
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142 MmuLock::Unlock(); |
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143 |
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144 // Note, whilst we hold the RamAllocLock the page can't change it's use |
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145 // and we can safely assume that it still belongs to the memory object |
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146 // at a fixed page index. |
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147 // Also, as memory objects can't be destroyed whilst they still own pages |
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148 // we can safely access this object without taking an explicit referernce, |
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149 // i.e. we don't need to Open() the memory object. |
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150 if (!pi) |
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151 {// page info for aOld not found so aOld is not a RAM page... |
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152 r = KErrArgument; |
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153 } |
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154 else if(!memory) |
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155 { |
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156 // page does not have a memory manager, so we can't move it... |
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157 r = KErrNotSupported; |
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158 } |
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159 else |
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160 { |
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161 // move page... |
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162 r = memory->iManager->MovePage(memory, pi, aNew, aBlockZoneId, aBlockRest); |
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163 } |
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164 return r; |
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165 } |