setdirty.c File Reference

#include "mi.h"

Go to the source code of this file.

Functions
VOID	MiSetDirtyBit (IN PVOID FaultingAddress, IN PMMPTE PointerPte, IN ULONG PfnHeld)

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Function Documentation

VOID MiSetDirtyBit (  IN PVOID  FaultingAddress, IN PMMPTE  PointerPte, IN ULONG  PfnHeld )

Definition at line 28 of file axp64/setdirty.c. References MI_GET_PAGE_FRAME_FROM_PTE, MI_PFN_ELEMENT, MI_SET_ACCESSED_IN_PTE, MiReleasePageFileSpace(), _MMPFN::OriginalPte, _MMPTE::u, and _MMPFN::u3. 00036 : 00037 00038 This routine sets dirty in the specified PTE and the modify bit in the 00039 correpsonding PFN element. If any page file space is allocated, it 00040 is deallocated. 00041 00042 Arguments: 00043 00044 FaultingAddress - Supplies the faulting address. 00045 00046 PointerPte - Supplies a pointer to the corresponding valid PTE. 00047 00048 PfnHeld - Supplies TRUE if the PFN mutex is already held. 00049 00050 Return Value: 00051 00052 None. 00053 00054 Environment: 00055 00056 Kernel mode, APC's disabled, Working set mutex held. 00057 00058 --*/ 00059 00060 { 00061 MMPTE TempPte; 00062 PFN_NUMBER PageFrameIndex; 00063 PMMPFN Pfn1; 00064 KIRQL OldIrql; 00065 00066 // 00067 // The TB entry must be flushed as the valid PTE with the dirty bit clear 00068 // has been fetched into the TB. If it isn't flushed, another fault 00069 // is generated as the dirty bit is not set in the cached TB entry. 00070 // 00071 00072 // KiFlushSingleDataTb( FaultingAddress ); 00073 __dtbis( FaultingAddress ); 00074 00075 // 00076 // The page is NOT copy on write, update the PTE setting both the 00077 // dirty bit and the accessed bit. Note, that as this PTE is in 00078 // the TB, the TB must be flushed. 00079 // 00080 00081 PageFrameIndex = MI_GET_PAGE_FRAME_FROM_PTE(PointerPte); 00082 Pfn1 = MI_PFN_ELEMENT (PageFrameIndex); 00083 00084 TempPte = *PointerPte; 00085 TempPte.u.Hard.FaultOnWrite = 0; 00086 MI_SET_ACCESSED_IN_PTE (&TempPte, 1); 00087 *PointerPte = TempPte; 00088 00089 // 00090 // If the PFN database lock is not held, then do not update the 00091 // PFN database. 00092 // 00093 00094 if( PfnHeld ){ 00095 00096 // 00097 // Set the modified field in the PFN database, also, if the physical 00098 // page is currently in a paging file, free up the page file space 00099 // as the contents are now worthless. 00100 // 00101 00102 if ( (Pfn1->OriginalPte.u.Soft.Prototype == 0) && 00103 (Pfn1->u3.e1.WriteInProgress == 0) ) { 00104 00105 // 00106 // This page is in page file format, deallocate the page file space. 00107 // 00108 00109 MiReleasePageFileSpace (Pfn1->OriginalPte); 00110 00111 // 00112 // Change original PTE to indicate no page file space is reserved, 00113 // otherwise the space will be deallocated when the PTE is 00114 // deleted. 00115 // 00116 00117 Pfn1->OriginalPte.u.Soft.PageFileHigh = 0; 00118 } 00119 00120 Pfn1->u3.e1.Modified = 1; 00121 00122 } 00123 00124 00125 return; 00126 } }

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