section.c File Reference

#include <ntoskrnl.h>
#include <ntintsafe.h>
#include <debug.h>
#include <mm/ARM3/miarm.h>

Include dependency graph for section.c:

Go to the source code of this file.

Macros
#define	NDEBUG
#define	MODULE_INVOLVED_IN_ARM3

Functions
BOOLEAN NTAPI	MiIsProtectionCompatible (IN ULONG SectionPageProtection, IN ULONG NewSectionPageProtection)
ACCESS_MASK NTAPI	MiArm3GetCorrectFileAccessMask (IN ACCESS_MASK SectionPageProtection)
ULONG NTAPI	MiMakeProtectionMask (IN ULONG Protect)
BOOLEAN NTAPI	MiInitializeSystemSpaceMap (IN PMMSESSION InputSession OPTIONAL)
PVOID NTAPI	MiInsertInSystemSpace (IN PMMSESSION Session, IN ULONG Buckets, IN PCONTROL_AREA ControlArea)
NTSTATUS NTAPI	MiAddMappedPtes (IN PMMPTE FirstPte, IN PFN_NUMBER PteCount, IN PCONTROL_AREA ControlArea)
VOID NTAPI	MiFillSystemPageDirectory (IN PVOID Base, IN SIZE_T NumberOfBytes)
NTSTATUS NTAPI	MiCheckPurgeAndUpMapCount (IN PCONTROL_AREA ControlArea, IN BOOLEAN FailIfSystemViews)
PSUBSECTION NTAPI	MiLocateSubsection (IN PMMVAD Vad, IN ULONG_PTR Vpn)
VOID NTAPI	MiSegmentDelete (IN PSEGMENT Segment)
VOID NTAPI	MiCheckControlArea (IN PCONTROL_AREA ControlArea, IN KIRQL OldIrql)
VOID NTAPI	MiDereferenceControlArea (IN PCONTROL_AREA ControlArea)
VOID NTAPI	MiRemoveMappedView (IN PEPROCESS CurrentProcess, IN PMMVAD Vad)
NTSTATUS NTAPI	MiUnmapViewOfSection (IN PEPROCESS Process, IN PVOID BaseAddress, IN ULONG Flags)
NTSTATUS NTAPI	MiSessionCommitPageTables (IN PVOID StartVa, IN PVOID EndVa)
NTSTATUS NTAPI	MiMapViewInSystemSpace (IN PVOID Section, IN PMMSESSION Session, OUT PVOID *MappedBase, IN OUT PSIZE_T ViewSize)
VOID NTAPI	MiSetControlAreaSymbolsLoaded (IN PCONTROL_AREA ControlArea)
VOID NTAPI	MiLoadUserSymbols (IN PCONTROL_AREA ControlArea, IN PVOID BaseAddress, IN PEPROCESS Process)
NTSTATUS NTAPI	MiMapViewOfDataSection (IN PCONTROL_AREA ControlArea, IN PEPROCESS Process, IN PVOID *BaseAddress, IN PLARGE_INTEGER SectionOffset, IN PSIZE_T ViewSize, IN PSECTION Section, IN SECTION_INHERIT InheritDisposition, IN ULONG ProtectionMask, IN SIZE_T CommitSize, IN ULONG_PTR ZeroBits, IN ULONG AllocationType)
VOID NTAPI	MiSubsectionConsistent (IN PSUBSECTION Subsection)
NTSTATUS NTAPI	MiCreateDataFileMap (IN PFILE_OBJECT File, OUT PSEGMENT *Segment, IN PSIZE_T MaximumSize, IN ULONG SectionPageProtection, IN ULONG AllocationAttributes, IN ULONG IgnoreFileSizing)
NTSTATUS NTAPI	MiCreatePagingFileMap (OUT PSEGMENT *Segment, IN PSIZE_T MaximumSize, IN ULONG ProtectionMask, IN ULONG AllocationAttributes)
NTSTATUS NTAPI	MiGetFileObjectForSectionAddress (IN PVOID Address, OUT PFILE_OBJECT *FileObject)
PFILE_OBJECT NTAPI	MmGetFileObjectForSection (IN PVOID SectionObject)
static PFILE_OBJECT	MiGetFileObjectForVad (_In_ PMMVAD Vad)
VOID NTAPI	MmGetImageInformation (OUT PSECTION_IMAGE_INFORMATION ImageInformation)
NTSTATUS NTAPI	MmGetFileNameForFileObject (IN PFILE_OBJECT FileObject, OUT POBJECT_NAME_INFORMATION *ModuleName)
NTSTATUS NTAPI	MmGetFileNameForSection (IN PVOID Section, OUT POBJECT_NAME_INFORMATION *ModuleName)
NTSTATUS NTAPI	MmGetFileNameForAddress (IN PVOID Address, OUT PUNICODE_STRING ModuleName)
NTSTATUS NTAPI	MiQueryMemorySectionName (IN HANDLE ProcessHandle, IN PVOID BaseAddress, OUT PVOID MemoryInformation, IN SIZE_T MemoryInformationLength, OUT PSIZE_T ReturnLength)
VOID NTAPI	MiFlushTbAndCapture (IN PMMVAD FoundVad, IN PMMPTE PointerPte, IN ULONG ProtectionMask, IN PMMPFN Pfn1, IN BOOLEAN UpdateDirty)
NTSTATUS NTAPI	MiSetProtectionOnSection (IN PEPROCESS Process, IN PMMVAD FoundVad, IN PVOID StartingAddress, IN PVOID EndingAddress, IN ULONG NewProtect, OUT PULONG CapturedOldProtect, IN ULONG DontCharge, OUT PULONG Locked)
VOID NTAPI	MiRemoveMappedPtes (IN PVOID BaseAddress, IN ULONG NumberOfPtes, IN PCONTROL_AREA ControlArea, IN PMMSUPPORT Ws)
ULONG NTAPI	MiRemoveFromSystemSpace (IN PMMSESSION Session, IN PVOID Base, OUT PCONTROL_AREA *ControlArea)
NTSTATUS NTAPI	MiUnmapViewInSystemSpace (IN PMMSESSION Session, IN PVOID MappedBase)
NTSTATUS NTAPI	MmCreateArm3Section (OUT PVOID *SectionObject, IN ACCESS_MASK DesiredAccess, IN POBJECT_ATTRIBUTES ObjectAttributes OPTIONAL, IN PLARGE_INTEGER InputMaximumSize, IN ULONG SectionPageProtection, IN ULONG AllocationAttributes, IN HANDLE FileHandle OPTIONAL, IN PFILE_OBJECT FileObject OPTIONAL)
NTSTATUS NTAPI	MmMapViewOfArm3Section (IN PVOID SectionObject, IN PEPROCESS Process, IN OUT PVOID *BaseAddress, IN ULONG_PTR ZeroBits, IN SIZE_T CommitSize, IN OUT PLARGE_INTEGER SectionOffset OPTIONAL, IN OUT PSIZE_T ViewSize, IN SECTION_INHERIT InheritDisposition, IN ULONG AllocationType, IN ULONG Protect)
BOOLEAN NTAPI	MmDisableModifiedWriteOfSection (IN PSECTION_OBJECT_POINTERS SectionObjectPointer)
BOOLEAN NTAPI	MmForceSectionClosed (IN PSECTION_OBJECT_POINTERS SectionObjectPointer, IN BOOLEAN DelayClose)
NTSTATUS NTAPI	MmMapViewInSessionSpace (IN PVOID Section, OUT PVOID *MappedBase, IN OUT PSIZE_T ViewSize)
NTSTATUS NTAPI	MmUnmapViewInSessionSpace (IN PVOID MappedBase)
NTSTATUS NTAPI	MmUnmapViewOfSection (IN PEPROCESS Process, IN PVOID BaseAddress)
NTSTATUS NTAPI	MmUnmapViewInSystemSpace (IN PVOID MappedBase)
NTSTATUS NTAPI	MmCommitSessionMappedView (IN PVOID MappedBase, IN SIZE_T ViewSize)
VOID NTAPI	MiDeleteARM3Section (PVOID ObjectBody)
ULONG NTAPI	MmDoesFileHaveUserWritableReferences (IN PSECTION_OBJECT_POINTERS SectionPointer)
NTSTATUS NTAPI	NtAreMappedFilesTheSame (IN PVOID File1MappedAsAnImage, IN PVOID File2MappedAsFile)
NTSTATUS NTAPI	NtCreateSection (OUT PHANDLE SectionHandle, IN ACCESS_MASK DesiredAccess, IN POBJECT_ATTRIBUTES ObjectAttributes OPTIONAL, IN PLARGE_INTEGER MaximumSize OPTIONAL, IN ULONG SectionPageProtection OPTIONAL, IN ULONG AllocationAttributes, IN HANDLE FileHandle OPTIONAL)
NTSTATUS NTAPI	NtOpenSection (OUT PHANDLE SectionHandle, IN ACCESS_MASK DesiredAccess, IN POBJECT_ATTRIBUTES ObjectAttributes)
NTSTATUS NTAPI	NtMapViewOfSection (IN HANDLE SectionHandle, IN HANDLE ProcessHandle, IN OUT PVOID *BaseAddress, IN ULONG_PTR ZeroBits, IN SIZE_T CommitSize, IN OUT PLARGE_INTEGER SectionOffset OPTIONAL, IN OUT PSIZE_T ViewSize, IN SECTION_INHERIT InheritDisposition, IN ULONG AllocationType, IN ULONG Protect)
NTSTATUS NTAPI	NtUnmapViewOfSection (IN HANDLE ProcessHandle, IN PVOID BaseAddress)
NTSTATUS NTAPI	NtExtendSection (IN HANDLE SectionHandle, IN OUT PLARGE_INTEGER NewMaximumSize)

Variables
ACCESS_MASK	MmMakeSectionAccess [8]
ACCESS_MASK	MmMakeFileAccess [8]
CHAR	MmUserProtectionToMask1 [16]
CHAR	MmUserProtectionToMask2 [16]
ULONG	MmCompatibleProtectionMask [8]
MMSESSION	MmSession
KGUARDED_MUTEX	MmSectionCommitMutex
MM_AVL_TABLE	MmSectionBasedRoot
KGUARDED_MUTEX	MmSectionBasedMutex
PVOID	MmHighSectionBase

Macro Definition Documentation

MODULE_INVOLVED_IN_ARM3

#define MODULE_INVOLVED_IN_ARM3

Definition at line 16 of file section.c.

NDEBUG

#define NDEBUG

Definition at line 13 of file section.c.

Function Documentation

MiAddMappedPtes()

NTSTATUS NTAPI MiAddMappedPtes	(	IN PMMPTE	FirstPte,
		IN PFN_NUMBER	PteCount,
		IN PCONTROL_AREA	ControlArea
	)

Definition at line 418 of file section.c.

Referenced by MiMapViewInSystemSpace().

{
    MMPTE TempPte;
    PMMPTE PointerPte, ProtoPte, LastProtoPte, LastPte;
    PSUBSECTION Subsection;

    /* ARM3 doesn't support this yet */
    ASSERT(ControlArea->u.Flags.GlobalOnlyPerSession == 0);
    ASSERT(ControlArea->u.Flags.Rom == 0);
    ASSERT(ControlArea->FilePointer == NULL);

    /* Sanity checks */
    ASSERT(PteCount != 0);
    ASSERT(ControlArea->NumberOfMappedViews >= 1);
    ASSERT(ControlArea->NumberOfUserReferences >= 1);
    ASSERT(ControlArea->NumberOfSectionReferences != 0);
    ASSERT(ControlArea->u.Flags.BeingCreated == 0);
    ASSERT(ControlArea->u.Flags.BeingDeleted == 0);
    ASSERT(ControlArea->u.Flags.BeingPurged == 0);

    /* Get the PTEs for the actual mapping */
    PointerPte = FirstPte;
    LastPte = FirstPte + PteCount;

    /* Get the prototype PTEs that desribe the section mapping in the subsection */
    Subsection = (PSUBSECTION)(ControlArea + 1);
    ProtoPte = Subsection->SubsectionBase;
    LastProtoPte = &Subsection->SubsectionBase[Subsection->PtesInSubsection];

    /* Loop the PTEs for the mapping */
    while (PointerPte < LastPte)
    {
        /* We may have run out of prototype PTEs in this subsection */
        if (ProtoPte >= LastProtoPte)
        {
            /* But we don't handle this yet */
            ASSERT(FALSE);
        }

        /* The PTE should be completely clear */
        ASSERT(PointerPte->u.Long == 0);

        /* Build the prototype PTE and write it */
        MI_MAKE_PROTOTYPE_PTE(&TempPte, ProtoPte);
        MI_WRITE_INVALID_PTE(PointerPte, TempPte);

        /* Keep going */
        PointerPte++;
        ProtoPte++;
    }

    /* No failure path */
    return STATUS_SUCCESS;
}

MiArm3GetCorrectFileAccessMask()

ACCESS_MASK NTAPI MiArm3GetCorrectFileAccessMask

(

IN ACCESS_MASK

SectionPageProtection

)

Definition at line 141 of file section.c.

{
    ULONG ProtectionMask;

    /* Calculate the protection mask and make sure it's valid */
    ProtectionMask = MiMakeProtectionMask(SectionPageProtection);
    if (ProtectionMask == MM_INVALID_PROTECTION)
    {
        DPRINT1("Invalid protection mask\n");
        return STATUS_INVALID_PAGE_PROTECTION;
    }

    /* Now convert it to the required file access */
    return MmMakeFileAccess[ProtectionMask & 0x7];
}

MiCheckControlArea()

VOID NTAPI MiCheckControlArea	(	IN PCONTROL_AREA	ControlArea,
		IN KIRQL	OldIrql
	)

Definition at line 729 of file section.c.

Referenced by MiDeleteARM3Section(), MiDereferenceControlArea(), MiRemoveMappedPtes(), MiRemoveMappedView(), and MmCreateArm3Section().

{
    BOOLEAN DeleteSegment = FALSE;
    MI_ASSERT_PFN_LOCK_HELD();

    /* Check if this is the last reference or view */
    if (!(ControlArea->NumberOfMappedViews) &&
        !(ControlArea->NumberOfSectionReferences))
    {
        /* There should be no more user references either */
        ASSERT(ControlArea->NumberOfUserReferences == 0);

        /* Not yet supported */
        ASSERT(ControlArea->FilePointer == NULL);

        /* The control area is being destroyed */
        ControlArea->u.Flags.BeingDeleted = TRUE;
        DeleteSegment = TRUE;
    }

    /* Release the PFN lock */
    MiReleasePfnLock(OldIrql);

    /* Delete the segment if needed */
    if (DeleteSegment)
    {
        /* No more user write references at all */
        ASSERT(ControlArea->WritableUserReferences == 0);
        MiSegmentDelete(ControlArea->Segment);
    }
}

MiCheckPurgeAndUpMapCount()

NTSTATUS NTAPI MiCheckPurgeAndUpMapCount	(	IN PCONTROL_AREA	ControlArea,
		IN BOOLEAN	FailIfSystemViews
	)

Definition at line 545 of file section.c.

Referenced by MiMapViewInSystemSpace(), and MiMapViewOfDataSection().

{
    KIRQL OldIrql;

    /* Flag not yet supported */
    ASSERT(FailIfSystemViews == FALSE);

    /* Lock the PFN database */
    OldIrql = MiAcquirePfnLock();

    /* State not yet supported */
    ASSERT(ControlArea->u.Flags.BeingPurged == 0);

    /* Increase the reference counts */
    ControlArea->NumberOfMappedViews++;
    ControlArea->NumberOfUserReferences++;
    ASSERT(ControlArea->NumberOfSectionReferences != 0);

    /* Release the PFN lock and return success */
    MiReleasePfnLock(OldIrql);
    return STATUS_SUCCESS;
}

MiCreateDataFileMap()

NTSTATUS NTAPI MiCreateDataFileMap	(	IN PFILE_OBJECT	File,
		OUT PSEGMENT *	Segment,
		IN PSIZE_T	MaximumSize,
		IN ULONG	SectionPageProtection,
		IN ULONG	AllocationAttributes,
		IN ULONG	IgnoreFileSizing
	)

Definition at line 1496 of file section.c.

Referenced by MmCreateArm3Section().

{
    /* Not yet implemented */
    ASSERT(FALSE);
    *Segment = NULL;
    return STATUS_NOT_IMPLEMENTED;
}

MiCreatePagingFileMap()

NTSTATUS NTAPI MiCreatePagingFileMap	(	OUT PSEGMENT *	Segment,
		IN PSIZE_T	MaximumSize,
		IN ULONG	ProtectionMask,
		IN ULONG	AllocationAttributes
	)

Definition at line 1511 of file section.c.

Referenced by MmCreateArm3Section().

{
    SIZE_T SizeLimit;
    PFN_COUNT PteCount;
    PMMPTE PointerPte;
    MMPTE TempPte;
    PCONTROL_AREA ControlArea;
    PSEGMENT NewSegment;
    PSUBSECTION Subsection;
    PAGED_CODE();

    /* No large pages in ARM3 yet */
    ASSERT((AllocationAttributes & SEC_LARGE_PAGES) == 0);

    /* Pagefile-backed sections need a known size */
    if (!(*MaximumSize)) return STATUS_INVALID_PARAMETER_4;

    /* Calculate the maximum size possible, given the Prototype PTEs we'll need */
    SizeLimit = MAXULONG_PTR - sizeof(SEGMENT);
    SizeLimit /= sizeof(MMPTE);
    SizeLimit <<= PAGE_SHIFT;

    /* Fail if this size is too big */
    if (*MaximumSize > SizeLimit) return STATUS_SECTION_TOO_BIG;

    /* Calculate how many Prototype PTEs will be needed */
    PteCount = (PFN_COUNT)((*MaximumSize + PAGE_SIZE - 1) >> PAGE_SHIFT);

    /* For commited memory, we must have a valid protection mask */
    if (AllocationAttributes & SEC_COMMIT) ASSERT(ProtectionMask != 0);

    /* The segment contains all the Prototype PTEs, allocate it in paged pool */
    NewSegment = ExAllocatePoolWithTag(PagedPool,
                                       sizeof(SEGMENT) +
                                       sizeof(MMPTE) * (PteCount - 1),
                                       'tSmM');
    ASSERT(NewSegment);
    *Segment = NewSegment;

    /* Now allocate the control area, which has the subsection structure */
    ControlArea = ExAllocatePoolWithTag(NonPagedPool,
                                        sizeof(CONTROL_AREA) + sizeof(SUBSECTION),
                                        'tCmM');
    ASSERT(ControlArea);

    /* And zero it out, filling the basic segmnet pointer and reference fields */
    RtlZeroMemory(ControlArea, sizeof(CONTROL_AREA) + sizeof(SUBSECTION));
    ControlArea->Segment = NewSegment;
    ControlArea->NumberOfSectionReferences = 1;
    ControlArea->NumberOfUserReferences = 1;

    /* Convert allocation attributes to control area flags */
    if (AllocationAttributes & SEC_BASED) ControlArea->u.Flags.Based = 1;
    if (AllocationAttributes & SEC_RESERVE) ControlArea->u.Flags.Reserve = 1;
    if (AllocationAttributes & SEC_COMMIT) ControlArea->u.Flags.Commit = 1;

    /* We just allocated it */
    ControlArea->u.Flags.BeingCreated = 1;

    /* The subsection follows, write the mask, PTE count and point back to the CA */
    Subsection = (PSUBSECTION)(ControlArea + 1);
    Subsection->ControlArea = ControlArea;
    Subsection->PtesInSubsection = PteCount;
    Subsection->u.SubsectionFlags.Protection = ProtectionMask;

    /* Zero out the segment's prototype PTEs, and link it with the control area */
    PointerPte = &NewSegment->ThePtes[0];
    RtlZeroMemory(NewSegment, sizeof(SEGMENT));
    NewSegment->PrototypePte = PointerPte;
    NewSegment->ControlArea = ControlArea;

    /* Save some extra accounting data for the segment as well */
    NewSegment->u1.CreatingProcess = PsGetCurrentProcess();
    NewSegment->SizeOfSegment = PteCount * PAGE_SIZE;
    NewSegment->TotalNumberOfPtes = PteCount;
    NewSegment->NonExtendedPtes = PteCount;

    /* The subsection's base address is the first Prototype PTE in the segment */
    Subsection->SubsectionBase = PointerPte;

    /* Start with an empty PTE, unless this is a commit operation */
    TempPte.u.Long = 0;
    if (AllocationAttributes & SEC_COMMIT)
    {
        /* In which case, write down the protection mask in the Prototype PTEs */
        TempPte.u.Soft.Protection = ProtectionMask;

        /* For accounting, also mark these pages as being committed */
        NewSegment->NumberOfCommittedPages = PteCount;
    }

    /* The template PTE itself for the segment should also have the mask set */
    NewSegment->SegmentPteTemplate.u.Soft.Protection = ProtectionMask;

    /* Write out the prototype PTEs, for now they're simply demand zero */
#ifdef _WIN64
    RtlFillMemoryUlonglong(PointerPte, PteCount * sizeof(MMPTE), TempPte.u.Long);
#else
    RtlFillMemoryUlong(PointerPte, PteCount * sizeof(MMPTE), TempPte.u.Long);
#endif
    return STATUS_SUCCESS;
}

MiDeleteARM3Section()

VOID NTAPI MiDeleteARM3Section

(

PVOID

ObjectBody

)

Definition at line 3247 of file section.c.

Referenced by MiQueryPageTableReferences(), and MmpDeleteSection().

{
    PSECTION SectionObject;
    PCONTROL_AREA ControlArea;
    KIRQL OldIrql;

    SectionObject = (PSECTION)ObjectBody;

    if (SectionObject->u.Flags.Based == 1)
    {
        /* Remove the node from the global section address tree */
        KeAcquireGuardedMutex(&MmSectionBasedMutex);
        MiRemoveNode(&SectionObject->Address, &MmSectionBasedRoot);
        KeReleaseGuardedMutex(&MmSectionBasedMutex);
    }

    /* Lock the PFN database */
    OldIrql = MiAcquirePfnLock();

    ASSERT(SectionObject->Segment);
    ASSERT(SectionObject->Segment->ControlArea);

    ControlArea = SectionObject->Segment->ControlArea;

    /* Dereference */
    ControlArea->NumberOfSectionReferences--;
    ControlArea->NumberOfUserReferences--;

    ASSERT(ControlArea->u.Flags.BeingDeleted == 0);

    /* Check it. It will delete it if there is no more reference to it */
    MiCheckControlArea(ControlArea, OldIrql);
}

MiDereferenceControlArea()

VOID NTAPI MiDereferenceControlArea

(

IN PCONTROL_AREA

ControlArea

)

Definition at line 764 of file section.c.

Referenced by MiMapViewInSystemSpace(), and MiMapViewOfDataSection().

{
    KIRQL OldIrql;

    /* Lock the PFN database */
    OldIrql = MiAcquirePfnLock();

    /* Drop reference counts */
    ControlArea->NumberOfMappedViews--;
    ControlArea->NumberOfUserReferences--;

    /* Check if it's time to delete the CA. This releases the lock */
    MiCheckControlArea(ControlArea, OldIrql);
}

MiFillSystemPageDirectory()

VOID NTAPI MiFillSystemPageDirectory	(	IN PVOID	Base,
		IN SIZE_T	NumberOfBytes
	)

Definition at line 477 of file section.c.

Referenced by MiMapViewInSystemSpace(), MmGetPageTableForProcess(), and ProtectToPTE().

{
    PMMPDE PointerPde, LastPde, SystemMapPde;
    MMPDE TempPde;
    PFN_NUMBER PageFrameIndex, ParentPage;
    KIRQL OldIrql;
    PAGED_CODE();

    /* Find the PDEs needed for this mapping */
    PointerPde = MiAddressToPde(Base);
    LastPde = MiAddressToPde((PVOID)((ULONG_PTR)Base + NumberOfBytes - 1));

#if (_MI_PAGING_LEVELS == 2)
    /* Find the system double-mapped PDE that describes this mapping */
    SystemMapPde = &MmSystemPagePtes[((ULONG_PTR)PointerPde & (SYSTEM_PD_SIZE - 1)) / sizeof(MMPTE)];
#else
    /* We don't have a double mapping */
    SystemMapPde = PointerPde;
#endif

    /* Use the PDE template and loop the PDEs */
    TempPde = ValidKernelPde;
    while (PointerPde <= LastPde)
    {
        /* Lock the PFN database */
        OldIrql = MiAcquirePfnLock();

        /* Check if we don't already have this PDE mapped */
        if (SystemMapPde->u.Hard.Valid == 0)
        {
            /* Grab a page for it */
            MI_SET_USAGE(MI_USAGE_PAGE_TABLE);
            MI_SET_PROCESS2(PsGetCurrentProcess()->ImageFileName);
            PageFrameIndex = MiRemoveZeroPage(MI_GET_NEXT_COLOR());
            ASSERT(PageFrameIndex);
            TempPde.u.Hard.PageFrameNumber = PageFrameIndex;

#if (_MI_PAGING_LEVELS == 2)
            ParentPage = MmSystemPageDirectory[(PointerPde - MiAddressToPde(NULL)) / PDE_COUNT];
#else
            ParentPage = MiPdeToPpe(PointerPde)->u.Hard.PageFrameNumber;
#endif
            /* Initialize its PFN entry, with the parent system page directory page table */
            MiInitializePfnForOtherProcess(PageFrameIndex,
                                           (PMMPTE)PointerPde,
                                           ParentPage);

            /* Make the system PDE entry valid */
            MI_WRITE_VALID_PDE(SystemMapPde, TempPde);

            /* The system PDE entry might be the PDE itself, so check for this */
            if (PointerPde->u.Hard.Valid == 0)
            {
                /* It's different, so make the real PDE valid too */
                MI_WRITE_VALID_PDE(PointerPde, TempPde);
            }
        }

        /* Release the lock and keep going with the next PDE */
        MiReleasePfnLock(OldIrql);
        SystemMapPde++;
        PointerPde++;
    }
}

MiFlushTbAndCapture()

VOID NTAPI MiFlushTbAndCapture	(	IN PMMVAD	FoundVad,
		IN PMMPTE	PointerPte,
		IN ULONG	ProtectionMask,
		IN PMMPFN	Pfn1,
		IN BOOLEAN	UpdateDirty
	)

Definition at line 1958 of file section.c.

Referenced by MiProtectVirtualMemory(), and MiSetProtectionOnSection().

{
    MMPTE TempPte, PreviousPte;
    KIRQL OldIrql;
    BOOLEAN RebuildPte = FALSE;

    //
    // User for sanity checking later on
    //
    PreviousPte = *PointerPte;

    //
    // Build the PTE and acquire the PFN lock
    //
    MI_MAKE_HARDWARE_PTE_USER(&TempPte,
                              PointerPte,
                              ProtectionMask,
                              PreviousPte.u.Hard.PageFrameNumber);
    OldIrql = MiAcquirePfnLock();

    //
    // We don't support I/O mappings in this path yet
    //
    ASSERT(Pfn1 != NULL);
    ASSERT(Pfn1->u3.e1.CacheAttribute != MiWriteCombined);

    //
    // Make sure new protection mask doesn't get in conflict and fix it if it does
    //
    if (Pfn1->u3.e1.CacheAttribute == MiCached)
    {
        //
        // This is a cached PFN
        //
        if (ProtectionMask & (MM_NOCACHE | MM_NOACCESS))
        {
            RebuildPte = TRUE;
            ProtectionMask &= ~(MM_NOCACHE | MM_NOACCESS);
        }
    }
    else if (Pfn1->u3.e1.CacheAttribute == MiNonCached)
    {
        //
        // This is a non-cached PFN
        //
        if ((ProtectionMask & (MM_NOCACHE | MM_NOACCESS)) != MM_NOCACHE)
        {
            RebuildPte = TRUE;
            ProtectionMask &= ~MM_NOACCESS;
            ProtectionMask |= MM_NOCACHE;
        }
    }

    if (RebuildPte)
    {
        MI_MAKE_HARDWARE_PTE_USER(&TempPte,
                                  PointerPte,
                                  ProtectionMask,
                                  PreviousPte.u.Hard.PageFrameNumber);
    }

    //
    // Write the new PTE, making sure we are only changing the bits
    //
    MI_UPDATE_VALID_PTE(PointerPte, TempPte);

    //
    // Flush the TLB
    //
    ASSERT(PreviousPte.u.Hard.Valid == 1);
    KeFlushCurrentTb();
    ASSERT(PreviousPte.u.Hard.Valid == 1);

    //
    // Windows updates the relevant PFN1 information, we currently don't.
    //
    if (UpdateDirty && PreviousPte.u.Hard.Dirty)
    {
        if (!Pfn1->u3.e1.Modified)
        {
            DPRINT1("FIXME: Mark PFN as dirty\n");
        }
    }

    //
    // Not supported in ARM3
    //
    ASSERT(FoundVad->u.VadFlags.VadType != VadWriteWatch);

    //
    // Release the PFN lock, we are done
    //
    MiReleasePfnLock(OldIrql);
}

MiGetFileObjectForSectionAddress()

NTSTATUS NTAPI MiGetFileObjectForSectionAddress	(	IN PVOID	Address,
		OUT PFILE_OBJECT *	FileObject
	)

Definition at line 1619 of file section.c.

{
    PMMVAD Vad;
    PCONTROL_AREA ControlArea;

    /* Get the VAD */
    Vad = MiLocateAddress(Address);
    if (Vad == NULL)
    {
        /* Fail, the address does not exist */
        DPRINT1("Invalid address\n");
        return STATUS_INVALID_ADDRESS;
    }

    /* Check if this is a RosMm memory area */
    if (Vad->u.VadFlags.Spare != 0)
    {
        PMEMORY_AREA MemoryArea = (PMEMORY_AREA)Vad;
        PROS_SECTION_OBJECT Section;

        /* Check if it's a section view (RosMm section) */
        if (MemoryArea->Type == MEMORY_AREA_SECTION_VIEW)
        {
            /* Get the section pointer to the SECTION_OBJECT */
            Section = MemoryArea->Data.SectionData.Section;
            *FileObject = Section->FileObject;
        }
        else
        {
            ASSERT(MemoryArea->Type == MEMORY_AREA_CACHE);
            DPRINT1("Address is a cache section!\n");
            return STATUS_SECTION_NOT_IMAGE;
        }
    }
    else
    {
        /* Make sure it's not a VM VAD */
        if (Vad->u.VadFlags.PrivateMemory == 1)
        {
            DPRINT1("Address is not a section\n");
            return STATUS_SECTION_NOT_IMAGE;
        }

        /* Get the control area */
        ControlArea = Vad->ControlArea;
        if (!(ControlArea) || !(ControlArea->u.Flags.Image))
        {
            DPRINT1("Address is not a section\n");
            return STATUS_SECTION_NOT_IMAGE;
        }

        /* Get the file object */
        *FileObject = ControlArea->FilePointer;
    }

    /* Return success */
    return STATUS_SUCCESS;
}

MiGetFileObjectForVad()

static PFILE_OBJECT MiGetFileObjectForVad ( _In_ PMMVAD  Vad )

static

Definition at line 1702 of file section.c.

Referenced by MmGetFileNameForAddress(), and NtAreMappedFilesTheSame().

{
    PCONTROL_AREA ControlArea;
    PFILE_OBJECT FileObject;

    /* Check if this is a RosMm memory area */
    if (Vad->u.VadFlags.Spare != 0)
    {
        PMEMORY_AREA MemoryArea = (PMEMORY_AREA)Vad;
        PROS_SECTION_OBJECT Section;

        /* Check if it's a section view (RosMm section) */
        if (MemoryArea->Type == MEMORY_AREA_SECTION_VIEW)
        {
            /* Get the section pointer to the SECTION_OBJECT */
            Section = MemoryArea->Data.SectionData.Section;
            FileObject = Section->FileObject;
        }
        else
        {
            ASSERT(MemoryArea->Type == MEMORY_AREA_CACHE);
            DPRINT1("VAD is a cache section!\n");
            return NULL;
        }
    }
    else
    {
        /* Make sure it's not a VM VAD */
        if (Vad->u.VadFlags.PrivateMemory == 1)
        {
            DPRINT1("VAD is not a section\n");
            return NULL;
        }

        /* Get the control area */
        ControlArea = Vad->ControlArea;
        if ((ControlArea == NULL) || !ControlArea->u.Flags.Image)
        {
            DPRINT1("Address is not a section\n");
            return NULL;
        }

        /* Get the file object */
        FileObject = ControlArea->FilePointer;
    }

    /* Return the file object */
    return FileObject;
}

MiInitializeSystemSpaceMap()

BOOLEAN NTAPI MiInitializeSystemSpaceMap

(

IN PMMSESSION InputSession

OPTIONAL

)

Definition at line 241 of file section.c.

Referenced by MiBuildPagedPool(), MiQueryPageTableReferences(), and MiSessionCreateInternal().

{
    SIZE_T AllocSize, BitmapSize, Size;
    PVOID ViewStart;
    PMMSESSION Session;

    /* Check if this a session or system space */
    if (InputSession)
    {
        /* Use the input session */
        Session = InputSession;
        ViewStart = MiSessionViewStart;
        Size = MmSessionViewSize;
    }
    else
    {
        /* Use the system space "session" */
        Session = &MmSession;
        ViewStart = MiSystemViewStart;
        Size = MmSystemViewSize;
    }

    /* Initialize the system space lock */
    Session->SystemSpaceViewLockPointer = &Session->SystemSpaceViewLock;
    KeInitializeGuardedMutex(Session->SystemSpaceViewLockPointer);

    /* Set the start address */
    Session->SystemSpaceViewStart = ViewStart;

    /* Create a bitmap to describe system space */
    BitmapSize = sizeof(RTL_BITMAP) + ((((Size / MI_SYSTEM_VIEW_BUCKET_SIZE) + 31) / 32) * sizeof(ULONG));
    Session->SystemSpaceBitMap = ExAllocatePoolWithTag(NonPagedPool,
                                                       BitmapSize,
                                                       TAG_MM);
    ASSERT(Session->SystemSpaceBitMap);
    RtlInitializeBitMap(Session->SystemSpaceBitMap,
                        (PULONG)(Session->SystemSpaceBitMap + 1),
                        (ULONG)(Size / MI_SYSTEM_VIEW_BUCKET_SIZE));

    /* Set system space fully empty to begin with */
    RtlClearAllBits(Session->SystemSpaceBitMap);

    /* Set default hash flags */
    Session->SystemSpaceHashSize = 31;
    Session->SystemSpaceHashKey = Session->SystemSpaceHashSize - 1;
    Session->SystemSpaceHashEntries = 0;

    /* Calculate how much space for the hash views we'll need */
    AllocSize = sizeof(MMVIEW) * Session->SystemSpaceHashSize;
    ASSERT(AllocSize < PAGE_SIZE);

    /* Allocate and zero the view table */
    Session->SystemSpaceViewTable = ExAllocatePoolWithTag(Session == &MmSession ?
                                                          NonPagedPool :
                                                          PagedPool,
                                                          AllocSize,
                                                          TAG_MM);
    ASSERT(Session->SystemSpaceViewTable != NULL);
    RtlZeroMemory(Session->SystemSpaceViewTable, AllocSize);

    /* Success */
    return TRUE;
}

MiInsertInSystemSpace()

PVOID NTAPI MiInsertInSystemSpace	(	IN PMMSESSION	Session,
		IN ULONG	Buckets,
		IN PCONTROL_AREA	ControlArea
	)

Definition at line 307 of file section.c.

Referenced by MiMapViewInSystemSpace().

{
    PVOID Base;
    ULONG Entry, Hash, i, HashSize;
    PMMVIEW OldTable;
    PAGED_CODE();

    /* Stay within 4GB */
    ASSERT(Buckets < MI_SYSTEM_VIEW_BUCKET_SIZE);

    /* Lock system space */
    KeAcquireGuardedMutex(Session->SystemSpaceViewLockPointer);

    /* Check if we're going to exhaust hash entries */
    if ((Session->SystemSpaceHashEntries + 8) > Session->SystemSpaceHashSize)
    {
        /* Double the hash size */
        HashSize = Session->SystemSpaceHashSize * 2;

        /* Save the old table and allocate a new one */
        OldTable = Session->SystemSpaceViewTable;
        Session->SystemSpaceViewTable = ExAllocatePoolWithTag(Session ==
                                                              &MmSession ?
                                                              NonPagedPool :
                                                              PagedPool,
                                                              HashSize *
                                                              sizeof(MMVIEW),
                                                              TAG_MM);
        if (!Session->SystemSpaceViewTable)
        {
            /* Failed to allocate a new table, keep the old one for now */
            Session->SystemSpaceViewTable = OldTable;
        }
        else
        {
            /* Clear the new table and set the new ahsh and key */
            RtlZeroMemory(Session->SystemSpaceViewTable, HashSize * sizeof(MMVIEW));
            Session->SystemSpaceHashSize = HashSize;
            Session->SystemSpaceHashKey = Session->SystemSpaceHashSize - 1;

            /* Loop the old table */
            for (i = 0; i < Session->SystemSpaceHashSize / 2; i++)
            {
                /* Check if the entry was valid */
                if (OldTable[i].Entry)
                {
                    /* Re-hash the old entry and search for space in the new table */
                    Hash = (OldTable[i].Entry >> 16) % Session->SystemSpaceHashKey;
                    while (Session->SystemSpaceViewTable[Hash].Entry)
                    {
                        /* Loop back at the beginning if we had an overflow */
                        if (++Hash >= Session->SystemSpaceHashSize) Hash = 0;
                    }

                    /* Write the old entry in the new table */
                    Session->SystemSpaceViewTable[Hash] = OldTable[i];
                }
            }

            /* Free the old table */
            ExFreePool(OldTable);
        }
    }

    /* Check if we ran out */
    if (Session->SystemSpaceHashEntries == Session->SystemSpaceHashSize)
    {
        DPRINT1("Ran out of system view hash entries\n");
        KeReleaseGuardedMutex(Session->SystemSpaceViewLockPointer);
        return NULL;
    }

    /* Find space where to map this view */
    i = RtlFindClearBitsAndSet(Session->SystemSpaceBitMap, Buckets, 0);
    if (i == 0xFFFFFFFF)
    {
        /* Out of space, fail */
        Session->BitmapFailures++;
        DPRINT1("Out of system view space\n");
        KeReleaseGuardedMutex(Session->SystemSpaceViewLockPointer);
        return NULL;
    }

    /* Compute the base address */
    Base = (PVOID)((ULONG_PTR)Session->SystemSpaceViewStart + (i * MI_SYSTEM_VIEW_BUCKET_SIZE));

    /* Get the hash entry for this allocation */
    Entry = ((ULONG_PTR)Base & ~(MI_SYSTEM_VIEW_BUCKET_SIZE - 1)) + Buckets;
    Hash = (Entry >> 16) % Session->SystemSpaceHashKey;

    /* Loop hash entries until a free one is found */
    while (Session->SystemSpaceViewTable[Hash].Entry)
    {
        /* Unless we overflow, in which case loop back at hash o */
        if (++Hash >= Session->SystemSpaceHashSize) Hash = 0;
    }

    /* Add this entry into the hash table */
    Session->SystemSpaceViewTable[Hash].Entry = Entry;
    Session->SystemSpaceViewTable[Hash].ControlArea = ControlArea;

    /* Hash entry found, increment total and return the base address */
    Session->SystemSpaceHashEntries++;
    KeReleaseGuardedMutex(Session->SystemSpaceViewLockPointer);
    return Base;
}

MiIsProtectionCompatible()

BOOLEAN NTAPI MiIsProtectionCompatible	(	IN ULONG	SectionPageProtection,
		IN ULONG	NewSectionPageProtection
	)

Definition at line 118 of file section.c.

Referenced by MmMapViewOfArm3Section().

{
    ULONG ProtectionMask, CompatibleMask;

    /* Calculate the protection mask and make sure it's valid */
    ProtectionMask = MiMakeProtectionMask(SectionPageProtection);
    if (ProtectionMask == MM_INVALID_PROTECTION)
    {
        DPRINT1("Invalid protection mask\n");
        return FALSE;
    }

    /* Calculate the compatible mask */
    CompatibleMask = MmCompatibleProtectionMask[ProtectionMask & 0x7] |
                     PAGE_GUARD | PAGE_NOCACHE | PAGE_WRITECOMBINE;

    /* See if the mapping protection is compatible with the create protection */
    return ((CompatibleMask | NewSectionPageProtection) == CompatibleMask);
}

MiLoadUserSymbols()

VOID NTAPI MiLoadUserSymbols	(	IN PCONTROL_AREA	ControlArea,
		IN PVOID	BaseAddress,
		IN PEPROCESS	Process
	)

Definition at line 1159 of file section.c.

{
    NTSTATUS Status;
    ANSI_STRING FileNameA;
    PLIST_ENTRY NextEntry;
    PUNICODE_STRING FileName;
    PIMAGE_NT_HEADERS NtHeaders;
    PLDR_DATA_TABLE_ENTRY LdrEntry;

    FileName = &ControlArea->FilePointer->FileName;
    if (FileName->Length == 0)
    {
        return;
    }

    /* Acquire module list lock */
    KeEnterCriticalRegion();
    ExAcquireResourceExclusiveLite(&PsLoadedModuleResource, TRUE);

    /* Browse list to try to find current module */
    for (NextEntry = MmLoadedUserImageList.Flink;
         NextEntry != &MmLoadedUserImageList;
         NextEntry = NextEntry->Flink)
    {
        /* Get the entry */
        LdrEntry = CONTAINING_RECORD(NextEntry,
                                     LDR_DATA_TABLE_ENTRY,
                                     InLoadOrderLinks);

        /* If already in the list, increase load count */
        if (LdrEntry->DllBase == BaseAddress)
        {
            ++LdrEntry->LoadCount;
            break;
        }
    }

    /* Not in the list, we'll add it */
    if (NextEntry == &MmLoadedUserImageList)
    {
        /* Allocate our element, taking to the name string and its null char */
        LdrEntry = ExAllocatePoolWithTag(NonPagedPool, FileName->Length + sizeof(UNICODE_NULL) + sizeof(*LdrEntry), 'bDmM');
        if (LdrEntry)
        {
            memset(LdrEntry, 0, FileName->Length + sizeof(UNICODE_NULL) + sizeof(*LdrEntry));

            _SEH2_TRY
            {
                /* Get image checksum and size */
                NtHeaders = RtlImageNtHeader(BaseAddress);
                if (NtHeaders)
                {
                    LdrEntry->SizeOfImage = NtHeaders->OptionalHeader.SizeOfImage;
                    LdrEntry->CheckSum = NtHeaders->OptionalHeader.CheckSum;
                }
            }
            _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
            {
                ExFreePoolWithTag(LdrEntry, 'bDmM');
                _SEH2_YIELD(return);
            }
            _SEH2_END;

            /* Fill all the details */
            LdrEntry->DllBase = BaseAddress;
            LdrEntry->FullDllName.Buffer = (PVOID)((ULONG_PTR)LdrEntry + sizeof(*LdrEntry));
            LdrEntry->FullDllName.Length = FileName->Length;
            LdrEntry->FullDllName.MaximumLength = FileName->Length + sizeof(UNICODE_NULL);
            memcpy(LdrEntry->FullDllName.Buffer, FileName->Buffer, FileName->Length);
            LdrEntry->FullDllName.Buffer[LdrEntry->FullDllName.Length / sizeof(WCHAR)] = UNICODE_NULL;
            LdrEntry->LoadCount = 1;

            /* Insert! */
            InsertHeadList(&MmLoadedUserImageList, &LdrEntry->InLoadOrderLinks);
        }
    }

    /* Release locks */
    ExReleaseResourceLite(&PsLoadedModuleResource);
    KeLeaveCriticalRegion();

    /* Load symbols */
    Status = RtlUnicodeStringToAnsiString(&FileNameA, FileName, TRUE);
    if (NT_SUCCESS(Status))
    {
        DbgLoadImageSymbols(&FileNameA, BaseAddress, (ULONG_PTR)Process->UniqueProcessId);
        RtlFreeAnsiString(&FileNameA);
    }
}

MiLocateSubsection()

PSUBSECTION NTAPI MiLocateSubsection	(	IN PMMVAD	Vad,
		IN ULONG_PTR	Vpn
	)

Definition at line 571 of file section.c.

Referenced by MiDeleteVirtualAddresses(), and MiQueryPageTableReferences().

{
    PSUBSECTION Subsection;
    PCONTROL_AREA ControlArea;
    ULONG_PTR PteOffset;

    /* Get the control area */
    ControlArea = Vad->ControlArea;
    ASSERT(ControlArea->u.Flags.Rom == 0);
    ASSERT(ControlArea->u.Flags.Image == 0);
    ASSERT(ControlArea->u.Flags.GlobalOnlyPerSession == 0);

    /* Get the subsection */
    Subsection = (PSUBSECTION)(ControlArea + 1);

    /* We only support single-subsection segments */
    ASSERT(Subsection->SubsectionBase != NULL);
    ASSERT(Vad->FirstPrototypePte >= Subsection->SubsectionBase);
    ASSERT(Vad->FirstPrototypePte < &Subsection->SubsectionBase[Subsection->PtesInSubsection]);

    /* Compute the PTE offset */
    PteOffset = Vpn - Vad->StartingVpn;
    PteOffset += Vad->FirstPrototypePte - Subsection->SubsectionBase;

    /* Again, we only support single-subsection segments */
    ASSERT(PteOffset < 0xF0000000);
    ASSERT(PteOffset < Subsection->PtesInSubsection);

    /* Return the subsection */
    return Subsection;
}

MiMakeProtectionMask()

ULONG NTAPI MiMakeProtectionMask

(

IN ULONG

Protect

)

Definition at line 159 of file section.c.

Referenced by MiArm3GetCorrectFileAccessMask(), MiIsProtectionCompatible(), MiProtectVirtualMemory(), MiQueryPageTableReferences(), MiSetProtectionOnSection(), MmCreateArm3Section(), MmCreateSection(), MmInsertMemoryArea(), MmLocateMemoryAreaByRegion(), MmMapViewOfArm3Section(), NtAllocateVirtualMemory(), and NtMapViewOfSection().

{
    ULONG Mask1, Mask2, ProtectMask;

    /* PAGE_EXECUTE_WRITECOMBINE is theoretically the maximum */
    if (Protect >= (PAGE_WRITECOMBINE * 2)) return MM_INVALID_PROTECTION;

    /*
     * Windows API protection mask can be understood as two bitfields, differing
     * by whether or not execute rights are being requested
     */
    Mask1 = Protect & 0xF;
    Mask2 = (Protect >> 4) & 0xF;

    /* Check which field is there */
    if (!Mask1)
    {
        /* Mask2 must be there, use it to determine the PTE protection */
        if (!Mask2) return MM_INVALID_PROTECTION;
        ProtectMask = MmUserProtectionToMask2[Mask2];
    }
    else
    {
        /* Mask2 should not be there, use Mask1 to determine the PTE mask */
        if (Mask2) return MM_INVALID_PROTECTION;
        ProtectMask = MmUserProtectionToMask1[Mask1];
    }

    /* Make sure the final mask is a valid one */
    if (ProtectMask == MM_INVALID_PROTECTION) return MM_INVALID_PROTECTION;

    /* Check for PAGE_GUARD option */
    if (Protect & PAGE_GUARD)
    {
        /* It's not valid on no-access, nocache, or writecombine pages */
        if ((ProtectMask == MM_NOACCESS) ||
            (Protect & (PAGE_NOCACHE | PAGE_WRITECOMBINE)))
        {
            /* Fail such requests */
            return MM_INVALID_PROTECTION;
        }

        /* This actually turns on guard page in this scenario! */
        ProtectMask |= MM_GUARDPAGE;
    }

    /* Check for nocache option */
    if (Protect & PAGE_NOCACHE)
    {
        /* The earlier check should've eliminated this possibility */
        ASSERT((Protect & PAGE_GUARD) == 0);

        /* Check for no-access page or write combine page */
        if ((ProtectMask == MM_NOACCESS) || (Protect & PAGE_WRITECOMBINE))
        {
            /* Such a request is invalid */
            return MM_INVALID_PROTECTION;
        }

        /* Add the PTE flag */
        ProtectMask |= MM_NOCACHE;
    }

    /* Check for write combine option */
    if (Protect & PAGE_WRITECOMBINE)
    {
        /* The two earlier scenarios should've caught this */
        ASSERT((Protect & (PAGE_GUARD | PAGE_NOACCESS)) == 0);

        /* Don't allow on no-access pages */
        if (ProtectMask == MM_NOACCESS) return MM_INVALID_PROTECTION;

        /* This actually turns on write-combine in this scenario! */
        ProtectMask |= MM_NOACCESS;
    }

    /* Return the final MM PTE protection mask */
    return ProtectMask;
}

MiMapViewInSystemSpace()

NTSTATUS NTAPI MiMapViewInSystemSpace	(	IN PVOID	Section,
		IN PMMSESSION	Session,
		OUT PVOID *	MappedBase,
		IN OUT PSIZE_T	ViewSize
	)

Definition at line 1053 of file section.c.

Referenced by MmMapViewInSessionSpace(), and MmMapViewInSystemSpace().

{
    PVOID Base;
    PCONTROL_AREA ControlArea;
    ULONG Buckets, SectionSize;
    NTSTATUS Status;
    PAGED_CODE();

    /* Get the control area, check for any flags ARM3 doesn't yet support */
    ControlArea = ((PSECTION)Section)->Segment->ControlArea;
    ASSERT(ControlArea->u.Flags.Image == 0);
    ASSERT(ControlArea->FilePointer == NULL);
    ASSERT(ControlArea->u.Flags.GlobalOnlyPerSession == 0);
    ASSERT(ControlArea->u.Flags.Rom == 0);
    ASSERT(ControlArea->u.Flags.WasPurged == 0);

    /* Increase the reference and map count on the control area, no purges yet */
    Status = MiCheckPurgeAndUpMapCount(ControlArea, FALSE);
    ASSERT(NT_SUCCESS(Status));

    /* Get the section size at creation time */
    SectionSize = ((PSECTION)Section)->SizeOfSection.LowPart;

    /* If the caller didn't specify a view size, assume the whole section */
    if (!(*ViewSize)) *ViewSize = SectionSize;

    /* Check if the caller wanted a larger section than the view */
    if (*ViewSize > SectionSize)
    {
        /* Fail */
        DPRINT1("View is too large\n");
        MiDereferenceControlArea(ControlArea);
        return STATUS_INVALID_VIEW_SIZE;
    }

    /* Get the number of 64K buckets required for this mapping */
    Buckets = (ULONG)(*ViewSize / MI_SYSTEM_VIEW_BUCKET_SIZE);
    if (*ViewSize & (MI_SYSTEM_VIEW_BUCKET_SIZE - 1)) Buckets++;

    /* Check if the view is more than 4GB large */
    if (Buckets >= MI_SYSTEM_VIEW_BUCKET_SIZE)
    {
        /* Fail */
        DPRINT1("View is too large\n");
        MiDereferenceControlArea(ControlArea);
        return STATUS_INVALID_VIEW_SIZE;
    }

    /* Insert this view into system space and get a base address for it */
    Base = MiInsertInSystemSpace(Session, Buckets, ControlArea);
    if (!Base)
    {
        /* Fail */
        DPRINT1("Out of system space\n");
        MiDereferenceControlArea(ControlArea);
        return STATUS_NO_MEMORY;
    }

    /* What's the underlying session? */
    if (Session == &MmSession)
    {
        /* Create the PDEs needed for this mapping, and double-map them if needed */
        MiFillSystemPageDirectory(Base, Buckets * MI_SYSTEM_VIEW_BUCKET_SIZE);
        Status = STATUS_SUCCESS;
    }
    else
    {
        /* Create the PDEs needed for this mapping */
        Status = MiSessionCommitPageTables(Base,
                                           (PVOID)((ULONG_PTR)Base +
                                           Buckets * MI_SYSTEM_VIEW_BUCKET_SIZE));
        ASSERT(NT_SUCCESS(Status));
    }

    /* Create the actual prototype PTEs for this mapping */
    Status = MiAddMappedPtes(MiAddressToPte(Base),
                             BYTES_TO_PAGES(*ViewSize),
                             ControlArea);
    ASSERT(NT_SUCCESS(Status));

    /* Return the base adress of the mapping and success */
    *MappedBase = Base;
    return STATUS_SUCCESS;
}

MiMapViewOfDataSection()

NTSTATUS NTAPI MiMapViewOfDataSection	(	IN PCONTROL_AREA	ControlArea,
		IN PEPROCESS	Process,
		IN PVOID *	BaseAddress,
		IN PLARGE_INTEGER	SectionOffset,
		IN PSIZE_T	ViewSize,
		IN PSECTION	Section,
		IN SECTION_INHERIT	InheritDisposition,
		IN ULONG	ProtectionMask,
		IN SIZE_T	CommitSize,
		IN ULONG_PTR	ZeroBits,
		IN ULONG	AllocationType
	)

Definition at line 1253 of file section.c.

Referenced by MmMapViewOfArm3Section().

{
    PMMVAD_LONG Vad;
    ULONG_PTR StartAddress;
    ULONG_PTR ViewSizeInPages;
    PSUBSECTION Subsection;
    PSEGMENT Segment;
    PFN_NUMBER PteOffset;
    NTSTATUS Status;
    ULONG QuotaCharge = 0, QuotaExcess = 0;
    PMMPTE PointerPte, LastPte;
    MMPTE TempPte;
    ULONG Granularity = MM_VIRTMEM_GRANULARITY;

    DPRINT("Mapping ARM3 data section\n");

    /* Get the segment for this section */
    Segment = ControlArea->Segment;

#ifdef _M_IX86
    /* ALlow being less restrictive on x86. */
    if (AllocationType & MEM_DOS_LIM)
        Granularity = PAGE_SIZE;
#endif

    /* One can only reserve a file-based mapping, not shared memory! */
    if ((AllocationType & MEM_RESERVE) && !(ControlArea->FilePointer))
    {
        return STATUS_INVALID_PARAMETER_9;
    }

    /* First, increase the map count. No purging is supported yet */
    Status = MiCheckPurgeAndUpMapCount(ControlArea, FALSE);
    if (!NT_SUCCESS(Status)) return Status;

    /* Check if the caller specified the view size */
    if (!(*ViewSize))
    {
        /* The caller did not, so pick a 64K aligned view size based on the offset */
        SectionOffset->LowPart &= ~(_64K - 1);
        *ViewSize = (SIZE_T)(Section->SizeOfSection.QuadPart - SectionOffset->QuadPart);
    }
    else
    {
        /* A size was specified, align it to a 64K boundary */
        *ViewSize += SectionOffset->LowPart & (_64K - 1);

        /* Align the offset as well to make this an aligned map */
        SectionOffset->LowPart &= ~((ULONG)_64K - 1);
    }

    /* We must be dealing with a 64KB aligned offset. This is a Windows ASSERT */
    ASSERT((SectionOffset->LowPart & ((ULONG)_64K - 1)) == 0);

    /* It's illegal to try to map more than overflows a LONG_PTR */
    if (*ViewSize >= MAXLONG_PTR)
    {
        MiDereferenceControlArea(ControlArea);
        return STATUS_INVALID_VIEW_SIZE;
    }

    /* Windows ASSERTs for this flag */
    ASSERT(ControlArea->u.Flags.GlobalOnlyPerSession == 0);

    /* Get the subsection. We don't support LARGE_CONTROL_AREA in ARM3 */
    ASSERT(ControlArea->u.Flags.Rom == 0);
    Subsection = (PSUBSECTION)(ControlArea + 1);

    /* Sections with extended segments are not supported in ARM3 */
    ASSERT(Segment->SegmentFlags.TotalNumberOfPtes4132 == 0);

    /* Within this section, figure out which PTEs will describe the view */
    PteOffset = (PFN_NUMBER)(SectionOffset->QuadPart >> PAGE_SHIFT);

    /* The offset must be in this segment's PTE chunk and it must be valid. Windows ASSERTs */
    ASSERT(PteOffset < Segment->TotalNumberOfPtes);
    ASSERT(((SectionOffset->QuadPart + *ViewSize + PAGE_SIZE - 1) >> PAGE_SHIFT) >= PteOffset);

    /* In ARM3, only one subsection is used for now. It must contain these PTEs */
    ASSERT(PteOffset < Subsection->PtesInSubsection);

    /* In ARM3, only page-file backed sections (shared memory) are supported now */
    ASSERT(ControlArea->FilePointer == NULL);

    /* Windows ASSERTs for this too -- there must be a subsection base address */
    ASSERT(Subsection->SubsectionBase != NULL);

    /* Compute how much commit space the segment will take */
    if ((CommitSize) && (Segment->NumberOfCommittedPages < Segment->TotalNumberOfPtes))
    {
        /* Charge for the maximum pages */
        QuotaCharge = BYTES_TO_PAGES(CommitSize);
    }

    /* ARM3 does not currently support large pages */
    ASSERT(Segment->SegmentFlags.LargePages == 0);

    /* Calculate how many pages the region spans */
    ViewSizeInPages = BYTES_TO_PAGES(*ViewSize);

    /* A VAD can now be allocated. Do so and zero it out */
    /* FIXME: we are allocating a LONG VAD for ReactOS compatibility only */
    ASSERT((AllocationType & MEM_RESERVE) == 0); /* ARM3 does not support this */
    Vad = ExAllocatePoolWithTag(NonPagedPool, sizeof(MMVAD_LONG), 'ldaV');
    if (!Vad)
    {
        MiDereferenceControlArea(ControlArea);
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    RtlZeroMemory(Vad, sizeof(MMVAD_LONG));
    Vad->u4.Banked = (PVOID)(ULONG_PTR)0xDEADBABEDEADBABEULL;

    /* Write all the data required in the VAD for handling a fault */
    Vad->ControlArea = ControlArea;
    Vad->u.VadFlags.CommitCharge = 0;
    Vad->u.VadFlags.Protection = ProtectionMask;
    Vad->u2.VadFlags2.FileOffset = (ULONG)(SectionOffset->QuadPart >> 16);
    Vad->u2.VadFlags2.Inherit = (InheritDisposition == ViewShare);
    if ((AllocationType & SEC_NO_CHANGE) || (Section->u.Flags.NoChange))
    {
        /* This isn't really implemented yet, but handle setting the flag */
        Vad->u.VadFlags.NoChange = 1;
        Vad->u2.VadFlags2.SecNoChange = 1;
    }

    /* Finally, write down the first and last prototype PTE */
    Vad->FirstPrototypePte = &Subsection->SubsectionBase[PteOffset];
    PteOffset += ViewSizeInPages - 1;
    ASSERT(PteOffset < Subsection->PtesInSubsection);
    Vad->LastContiguousPte = &Subsection->SubsectionBase[PteOffset];

    /* Make sure the prototype PTE ranges make sense, this is a Windows ASSERT */
    ASSERT(Vad->FirstPrototypePte <= Vad->LastContiguousPte);

    /* FIXME: Should setup VAD bitmap */
    Status = STATUS_SUCCESS;

    /* Check if anything was committed */
    if (QuotaCharge)
    {
        /* Set the start and end PTE addresses, and pick the template PTE */
        PointerPte = Vad->FirstPrototypePte;
        LastPte = PointerPte + BYTES_TO_PAGES(CommitSize);
        TempPte = Segment->SegmentPteTemplate;

        /* Acquire the commit lock and loop all prototype PTEs to be committed */
        KeAcquireGuardedMutex(&MmSectionCommitMutex);
        while (PointerPte < LastPte)
        {
            /* Make sure the PTE is already invalid */
            if (PointerPte->u.Long == 0)
            {
                /* And write the invalid PTE */
                MI_WRITE_INVALID_PTE(PointerPte, TempPte);
            }
            else
            {
                /* The PTE is valid, so skip it */
                QuotaExcess++;
            }

            /* Move to the next PTE */
            PointerPte++;
        }

        /* Now check how many pages exactly we committed, and update accounting */
        ASSERT(QuotaCharge >= QuotaExcess);
        QuotaCharge -= QuotaExcess;
        Segment->NumberOfCommittedPages += QuotaCharge;
        ASSERT(Segment->NumberOfCommittedPages <= Segment->TotalNumberOfPtes);

        /* Now that we're done, release the lock */
        KeReleaseGuardedMutex(&MmSectionCommitMutex);
    }

    /* Is it SEC_BASED, or did the caller manually specify an address? */
    if (*BaseAddress != NULL)
    {
        /* Just align what the caller gave us */
        StartAddress = ALIGN_DOWN_BY((ULONG_PTR)*BaseAddress, Granularity);
    }
    else if (Section->Address.StartingVpn != 0)
    {
        /* It is a SEC_BASED mapping, use the address that was generated */
        StartAddress = Section->Address.StartingVpn + SectionOffset->LowPart;
    }
    else
    {
        StartAddress = 0;
    }

    /* Insert the VAD */
    Status = MiInsertVadEx((PMMVAD)Vad,
                           &StartAddress,
                           ViewSizeInPages * PAGE_SIZE,
                           MAXULONG_PTR >> ZeroBits,
                           Granularity,
                           AllocationType);
    if (!NT_SUCCESS(Status))
    {
        return Status;
    }

    /* Windows stores this for accounting purposes, do so as well */
    if (!Segment->u2.FirstMappedVa) Segment->u2.FirstMappedVa = (PVOID)StartAddress;

    /* Finally, let the caller know where, and for what size, the view was mapped */
    *ViewSize = ViewSizeInPages * PAGE_SIZE;
    *BaseAddress = (PVOID)StartAddress;
    DPRINT("Start and region: 0x%p, 0x%p\n", *BaseAddress, *ViewSize);
    return STATUS_SUCCESS;
}

MiQueryMemorySectionName()

NTSTATUS NTAPI MiQueryMemorySectionName	(	IN HANDLE	ProcessHandle,
		IN PVOID	BaseAddress,
		OUT PVOID	MemoryInformation,
		IN SIZE_T	MemoryInformationLength,
		OUT PSIZE_T	ReturnLength
	)

Definition at line 1893 of file section.c.

Referenced by MiQueryPageTableReferences(), and NtQueryVirtualMemory().

{
    PEPROCESS Process;
    NTSTATUS Status;
    WCHAR ModuleFileNameBuffer[MAX_PATH] = {0};
    UNICODE_STRING ModuleFileName;
    PMEMORY_SECTION_NAME SectionName = NULL;
    KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();

    Status = ObReferenceObjectByHandle(ProcessHandle,
                                       PROCESS_QUERY_INFORMATION,
                                       NULL,
                                       PreviousMode,
                                       (PVOID*)(&Process),
                                       NULL);

    if (!NT_SUCCESS(Status))
    {
        DPRINT("MiQueryMemorySectionName: ObReferenceObjectByHandle returned %x\n",Status);
        return Status;
    }

    RtlInitEmptyUnicodeString(&ModuleFileName, ModuleFileNameBuffer, sizeof(ModuleFileNameBuffer));
    Status = MmGetFileNameForAddress(BaseAddress, &ModuleFileName);

    if (NT_SUCCESS(Status))
    {
        SectionName = MemoryInformation;
        if (PreviousMode != KernelMode)
        {
            _SEH2_TRY
            {
                RtlInitUnicodeString(&SectionName->SectionFileName, SectionName->NameBuffer);
                SectionName->SectionFileName.MaximumLength = (USHORT)MemoryInformationLength;
                RtlCopyUnicodeString(&SectionName->SectionFileName, &ModuleFileName);

                if (ReturnLength) *ReturnLength = ModuleFileName.Length;

            }
            _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
            {
                Status = _SEH2_GetExceptionCode();
            }
            _SEH2_END;
        }
        else
        {
            RtlInitUnicodeString(&SectionName->SectionFileName, SectionName->NameBuffer);
            SectionName->SectionFileName.MaximumLength = (USHORT)MemoryInformationLength;
            RtlCopyUnicodeString(&SectionName->SectionFileName, &ModuleFileName);

            if (ReturnLength) *ReturnLength = ModuleFileName.Length;

        }
    }
    ObDereferenceObject(Process);
    return Status;
}

MiRemoveFromSystemSpace()

ULONG NTAPI MiRemoveFromSystemSpace	(	IN PMMSESSION	Session,
		IN PVOID	Base,
		OUT PCONTROL_AREA *	ControlArea
	)

Definition at line 2333 of file section.c.

Referenced by MiUnmapViewInSystemSpace().

{
    ULONG Hash, Size, Count = 0;
    ULONG_PTR Entry;
    PAGED_CODE();

    /* Compute the hash for this entry and loop trying to find it */
    Entry = (ULONG_PTR)Base >> 16;
    Hash = Entry % Session->SystemSpaceHashKey;
    while ((Session->SystemSpaceViewTable[Hash].Entry >> 16) != Entry)
    {
        /* Check if we overflew past the end of the hash table */
        if (++Hash >= Session->SystemSpaceHashSize)
        {
            /* Reset the hash to zero and keep searching from the bottom */
            Hash = 0;
            if (++Count == 2)
            {
                /* But if we overflew twice, then this is not a real mapping */
                KeBugCheckEx(DRIVER_UNMAPPING_INVALID_VIEW,
                             (ULONG_PTR)Base,
                             1,
                             0,
                             0);
            }
        }
    }

    /* One less entry */
    Session->SystemSpaceHashEntries--;

    /* Extract the size and clear the entry */
    Size = Session->SystemSpaceViewTable[Hash].Entry & 0xFFFF;
    Session->SystemSpaceViewTable[Hash].Entry = 0;

    /* Return the control area and the size */
    *ControlArea = Session->SystemSpaceViewTable[Hash].ControlArea;
    return Size;
}

MiRemoveMappedPtes()

VOID NTAPI MiRemoveMappedPtes	(	IN PVOID	BaseAddress,
		IN ULONG	NumberOfPtes,
		IN PCONTROL_AREA	ControlArea,
		IN PMMSUPPORT	Ws
	)

Definition at line 2231 of file section.c.

Referenced by MiUnmapViewInSystemSpace().

{
    PMMPTE PointerPte, ProtoPte;//, FirstPte;
    PMMPDE PointerPde, SystemMapPde;
    PMMPFN Pfn1, Pfn2;
    MMPTE PteContents;
    KIRQL OldIrql;
    DPRINT("Removing mapped view at: 0x%p\n", BaseAddress);

    ASSERT(Ws == NULL);

    /* Get the PTE and loop each one */
    PointerPte = MiAddressToPte(BaseAddress);
    //FirstPte = PointerPte;
    while (NumberOfPtes)
    {
        /* Check if the PTE is already valid */
        PteContents = *PointerPte;
        if (PteContents.u.Hard.Valid == 1)
        {
            /* Get the PFN entry */
            Pfn1 = MiGetPfnEntry(PFN_FROM_PTE(&PteContents));

            /* Get the PTE */
            PointerPde = MiPteToPde(PointerPte);

            /* Lock the PFN database and make sure this isn't a mapped file */
            OldIrql = MiAcquirePfnLock();
            ASSERT(((Pfn1->u3.e1.PrototypePte) && (Pfn1->OriginalPte.u.Soft.Prototype)) == 0);

            /* Mark the page as modified accordingly */
            if (MI_IS_PAGE_DIRTY(&PteContents))
                Pfn1->u3.e1.Modified = 1;

            /* Was the PDE invalid */
            if (PointerPde->u.Long == 0)
            {
#if (_MI_PAGING_LEVELS == 2)
                /* Find the system double-mapped PDE that describes this mapping */
                SystemMapPde = &MmSystemPagePtes[((ULONG_PTR)PointerPde & (SYSTEM_PD_SIZE - 1)) / sizeof(MMPTE)];

                /* Make it valid */
                ASSERT(SystemMapPde->u.Hard.Valid == 1);
                MI_WRITE_VALID_PDE(PointerPde, *SystemMapPde);
#else
                DBG_UNREFERENCED_LOCAL_VARIABLE(SystemMapPde);
                ASSERT(FALSE);
#endif
            }

            /* Dereference the PDE and the PTE */
            Pfn2 = MiGetPfnEntry(PFN_FROM_PTE(PointerPde));
            MiDecrementShareCount(Pfn2, PFN_FROM_PTE(PointerPde));
            DBG_UNREFERENCED_LOCAL_VARIABLE(Pfn2);
            MiDecrementShareCount(Pfn1, PFN_FROM_PTE(&PteContents));

            /* Release the PFN lock */
            MiReleasePfnLock(OldIrql);
        }
        else
        {
            /* Windows ASSERT */
            ASSERT((PteContents.u.Long == 0) || (PteContents.u.Soft.Prototype == 1));

            /* Check if this is a prototype pointer PTE */
            if (PteContents.u.Soft.Prototype == 1)
            {
                /* Get the prototype PTE */
                ProtoPte = MiProtoPteToPte(&PteContents);

                /* We don't support anything else atm */
                ASSERT(ProtoPte->u.Long == 0);
            }
        }

        /* Make the PTE into a zero PTE */
        PointerPte->u.Long = 0;

        /* Move to the next PTE */
        PointerPte++;
        NumberOfPtes--;
    }

    /* Flush the TLB */
    KeFlushCurrentTb();

    /* Acquire the PFN lock */
    OldIrql = MiAcquirePfnLock();

    /* Decrement the accounting counters */
    ControlArea->NumberOfUserReferences--;
    ControlArea->NumberOfMappedViews--;

    /* Check if we should destroy the CA and release the lock */
    MiCheckControlArea(ControlArea, OldIrql);
}

MiRemoveMappedView()

VOID NTAPI MiRemoveMappedView	(	IN PEPROCESS	CurrentProcess,
		IN PMMVAD	Vad
	)

Definition at line 781 of file section.c.

Referenced by MiQueryPageTableReferences(), MiUnmapViewOfSection(), and MmCleanProcessAddressSpace().

{
    KIRQL OldIrql;
    PCONTROL_AREA ControlArea;
    PETHREAD CurrentThread = PsGetCurrentThread();

    /* Get the control area */
    ControlArea = Vad->ControlArea;

    /* We only support non-extendable, non-image, pagefile-backed regular sections */
    ASSERT(Vad->u.VadFlags.VadType == VadNone);
    ASSERT(Vad->u2.VadFlags2.ExtendableFile == FALSE);
    ASSERT(ControlArea);
    ASSERT(ControlArea->FilePointer == NULL);

    /* Delete the actual virtual memory pages */
    MiDeleteVirtualAddresses(Vad->StartingVpn << PAGE_SHIFT,
                             (Vad->EndingVpn << PAGE_SHIFT) | (PAGE_SIZE - 1),
                             Vad);

    /* Release the working set */
    MiUnlockProcessWorkingSetUnsafe(CurrentProcess, CurrentThread);

    /* Lock the PFN database */
    OldIrql = MiAcquirePfnLock();

    /* Remove references */
    ControlArea->NumberOfMappedViews--;
    ControlArea->NumberOfUserReferences--;

    /* Check if it should be destroyed */
    MiCheckControlArea(ControlArea, OldIrql);
}

MiSegmentDelete()

VOID NTAPI MiSegmentDelete

(

IN PSEGMENT

Segment

)

Definition at line 606 of file section.c.

Referenced by MiCheckControlArea().

{
    PCONTROL_AREA ControlArea;
    SEGMENT_FLAGS SegmentFlags;
    PSUBSECTION Subsection;
    PMMPTE PointerPte, LastPte, PteForProto;
    PMMPFN Pfn1;
    PFN_NUMBER PageFrameIndex;
    MMPTE TempPte;
    KIRQL OldIrql;

    /* Capture data */
    SegmentFlags = Segment->SegmentFlags;
    ControlArea = Segment->ControlArea;

    /* Make sure control area is on the right delete path */
    ASSERT(ControlArea->u.Flags.BeingDeleted == 1);
    ASSERT(ControlArea->WritableUserReferences == 0);

    /* These things are not supported yet */
    ASSERT(ControlArea->DereferenceList.Flink == NULL);
    ASSERT(!(ControlArea->u.Flags.Image) && !(ControlArea->u.Flags.File));
    ASSERT(ControlArea->u.Flags.GlobalOnlyPerSession == 0);
    ASSERT(ControlArea->u.Flags.Rom == 0);

    /* Get the subsection and PTEs for this segment */
    Subsection = (PSUBSECTION)(ControlArea + 1);
    PointerPte = Subsection->SubsectionBase;
    LastPte = PointerPte + Segment->NonExtendedPtes;

    /* Lock the PFN database */
    OldIrql = MiAcquirePfnLock();

    /* Check if the master PTE is invalid */
    PteForProto = MiAddressToPte(PointerPte);
    if (!PteForProto->u.Hard.Valid)
    {
        /* Fault it in */
        MiMakeSystemAddressValidPfn(PointerPte, OldIrql);
    }

    /* Loop all the segment PTEs */
    while (PointerPte < LastPte)
    {
        /* Check if it's time to switch master PTEs if we passed a PDE boundary */
        if (!((ULONG_PTR)PointerPte & (PD_SIZE - 1)) &&
            (PointerPte != Subsection->SubsectionBase))
        {
            /* Check if the master PTE is invalid */
            PteForProto = MiAddressToPte(PointerPte);
            if (!PteForProto->u.Hard.Valid)
            {
                /* Fault it in */
                MiMakeSystemAddressValidPfn(PointerPte, OldIrql);
            }
        }

        /* This should be a prototype PTE */
        TempPte = *PointerPte;
        ASSERT(SegmentFlags.LargePages == 0);
        ASSERT(TempPte.u.Hard.Valid == 0);

        /* See if we should clean things up */
        if (!(ControlArea->u.Flags.Image) && !(ControlArea->u.Flags.File))
        {
            /*
             * This is a section backed by the pagefile. Now that it doesn't exist anymore,
             * we can give everything back to the system.
             */
            ASSERT(TempPte.u.Soft.Prototype == 0);

            if (TempPte.u.Soft.Transition == 1)
            {
                /* We can give the page back for other use */
                DPRINT("Releasing page for transition PTE %p\n", PointerPte);
                PageFrameIndex = PFN_FROM_PTE(&TempPte);
                Pfn1 = MI_PFN_ELEMENT(PageFrameIndex);

                /* As this is a paged-backed section, nobody should reference it anymore (no cache or whatever) */
                ASSERT(Pfn1->u3.ReferenceCount == 0);

                /* And it should be in standby or modified list */
                ASSERT((Pfn1->u3.e1.PageLocation == ModifiedPageList) || (Pfn1->u3.e1.PageLocation == StandbyPageList));

                /* Unlink it and put it back in free list */
                MiUnlinkPageFromList(Pfn1);

                /* Temporarily mark this as active and make it free again */
                Pfn1->u3.e1.PageLocation = ActiveAndValid;
                MI_SET_PFN_DELETED(Pfn1);

                MiInsertPageInFreeList(PageFrameIndex);
            }
            else if (TempPte.u.Soft.PageFileHigh != 0)
            {
                /* Should not happen for now */
                ASSERT(FALSE);
            }
        }
        else
        {
            /* unsupported for now */
            ASSERT(FALSE);

            /* File-backed section must have prototype PTEs */
            ASSERT(TempPte.u.Soft.Prototype == 1);
        }

        /* Zero the PTE and keep going */
        PointerPte->u.Long = 0;
        PointerPte++;
    }

    /* Release the PFN lock */
    MiReleasePfnLock(OldIrql);

    /* Free the structures */
    ExFreePool(ControlArea);
    ExFreePool(Segment);
}

MiSessionCommitPageTables()

NTSTATUS NTAPI MiSessionCommitPageTables	(	IN PVOID	StartVa,
		IN PVOID	EndVa
	)

Definition at line 936 of file section.c.

Referenced by MiMapViewInSystemSpace(), and MiQueryPageTableReferences().

{
    KIRQL OldIrql;
    ULONG Color, Index;
    PMMPDE StartPde, EndPde;
    MMPDE TempPde = ValidKernelPdeLocal;
    PMMPFN Pfn1;
    PFN_NUMBER PageCount = 0, ActualPages = 0, PageFrameNumber;

    /* Windows sanity checks */
    ASSERT(StartVa >= (PVOID)MmSessionBase);
    ASSERT(EndVa < (PVOID)MiSessionSpaceEnd);
    ASSERT(PAGE_ALIGN(EndVa) == EndVa);

    /* Get the start and end PDE, then loop each one */
    StartPde = MiAddressToPde(StartVa);
    EndPde = MiAddressToPde((PVOID)((ULONG_PTR)EndVa - 1));
    Index = ((ULONG_PTR)StartVa - (ULONG_PTR)MmSessionBase) >> 22;
    while (StartPde <= EndPde)
    {
#ifndef _M_AMD64
        /* If we don't already have a page table for it, increment count */
        if (MmSessionSpace->PageTables[Index].u.Long == 0) PageCount++;
#endif
        /* Move to the next one */
        StartPde++;
        Index++;
    }

    /* If there's no page tables to create, bail out */
    if (PageCount == 0) return STATUS_SUCCESS;

    /* Reset the start PDE and index */
    StartPde = MiAddressToPde(StartVa);
    Index = ((ULONG_PTR)StartVa - (ULONG_PTR)MmSessionBase) >> 22;

    /* Loop each PDE while holding the working set lock */
//  MiLockWorkingSet(PsGetCurrentThread(),
//                   &MmSessionSpace->GlobalVirtualAddress->Vm);
#ifdef _M_AMD64
_WARN("MiSessionCommitPageTables halfplemented for amd64")
    DBG_UNREFERENCED_LOCAL_VARIABLE(OldIrql);
    DBG_UNREFERENCED_LOCAL_VARIABLE(Color);
    DBG_UNREFERENCED_LOCAL_VARIABLE(TempPde);
    DBG_UNREFERENCED_LOCAL_VARIABLE(Pfn1);
    DBG_UNREFERENCED_LOCAL_VARIABLE(PageFrameNumber);
    ASSERT(FALSE);
#else
    while (StartPde <= EndPde)
    {
        /* Check if we already have a page table */
        if (MmSessionSpace->PageTables[Index].u.Long == 0)
        {
            /* We don't, so the PDE shouldn't be ready yet */
            ASSERT(StartPde->u.Hard.Valid == 0);

            /* ReactOS check to avoid MiEnsureAvailablePageOrWait */
            ASSERT(MmAvailablePages >= 32);

            /* Acquire the PFN lock and grab a zero page */
            OldIrql = MiAcquirePfnLock();
            MI_SET_USAGE(MI_USAGE_PAGE_TABLE);
            MI_SET_PROCESS2(PsGetCurrentProcess()->ImageFileName);
            Color = (++MmSessionSpace->Color) & MmSecondaryColorMask;
            PageFrameNumber = MiRemoveZeroPage(Color);
            TempPde.u.Hard.PageFrameNumber = PageFrameNumber;
            MI_WRITE_VALID_PDE(StartPde, TempPde);

            /* Write the page table in session space structure */
            ASSERT(MmSessionSpace->PageTables[Index].u.Long == 0);
            MmSessionSpace->PageTables[Index] = TempPde;

            /* Initialize the PFN */
            MiInitializePfnForOtherProcess(PageFrameNumber,
                                           StartPde,
                                           MmSessionSpace->SessionPageDirectoryIndex);

            /* And now release the lock */
            MiReleasePfnLock(OldIrql);

            /* Get the PFN entry and make sure there's no event for it */
            Pfn1 = MI_PFN_ELEMENT(PageFrameNumber);
            ASSERT(Pfn1->u1.Event == NULL);

            /* Increment the number of pages */
            ActualPages++;
        }

        /* Move to the next PDE */
        StartPde++;
        Index++;
    }
#endif

    /* Make sure we didn't do more pages than expected */
    ASSERT(ActualPages <= PageCount);

    /* Release the working set lock */
//  MiUnlockWorkingSet(PsGetCurrentThread(),
//                     &MmSessionSpace->GlobalVirtualAddress->Vm);


    /* If we did at least one page... */
    if (ActualPages)
    {
        /* Update the performance counters! */
        InterlockedExchangeAddSizeT(&MmSessionSpace->NonPageablePages, ActualPages);
        InterlockedExchangeAddSizeT(&MmSessionSpace->CommittedPages, ActualPages);
    }

    /* Return status */
    return STATUS_SUCCESS;
}

MiSetControlAreaSymbolsLoaded()

VOID NTAPI MiSetControlAreaSymbolsLoaded

(

IN PCONTROL_AREA

ControlArea

)

Definition at line 1143 of file section.c.

{
    KIRQL OldIrql;

    ASSERT(KeGetCurrentIrql() <= APC_LEVEL);

    OldIrql = MiAcquirePfnLock();
    ControlArea->u.Flags.DebugSymbolsLoaded |= 1;

    ASSERT(OldIrql <= APC_LEVEL);
    MiReleasePfnLock(OldIrql);
    ASSERT(KeGetCurrentIrql() <= APC_LEVEL);
}

MiSetProtectionOnSection()

NTSTATUS NTAPI MiSetProtectionOnSection	(	IN PEPROCESS	Process,
		IN PMMVAD	FoundVad,
		IN PVOID	StartingAddress,
		IN PVOID	EndingAddress,
		IN ULONG	NewProtect,
		OUT PULONG	CapturedOldProtect,
		IN ULONG	DontCharge,
		OUT PULONG	Locked
	)

Definition at line 2062 of file section.c.

{
    PMMPTE PointerPte, LastPte;
    MMPTE TempPte, PteContents;
    PMMPDE PointerPde;
    PMMPFN Pfn1;
    ULONG ProtectionMask, QuotaCharge = 0;
    PETHREAD Thread = PsGetCurrentThread();
    PAGED_CODE();

    //
    // Tell caller nothing is being locked
    //
    *Locked = FALSE;

    //
    // This function should only be used for section VADs. Windows ASSERT */
    //
    ASSERT(FoundVad->u.VadFlags.PrivateMemory == 0);

    //
    // We don't support these features in ARM3
    //
    ASSERT(FoundVad->u.VadFlags.VadType != VadImageMap);
    ASSERT(FoundVad->u2.VadFlags2.CopyOnWrite == 0);

    //
    // Convert and validate the protection mask
    //
    ProtectionMask = MiMakeProtectionMask(NewProtect);
    if (ProtectionMask == MM_INVALID_PROTECTION)
    {
        DPRINT1("Invalid section protect\n");
        return STATUS_INVALID_PAGE_PROTECTION;
    }

    //
    // Get the PTE and PDE for the address, as well as the final PTE
    //
    MiLockProcessWorkingSetUnsafe(Process, Thread);
    PointerPde = MiAddressToPde(StartingAddress);
    PointerPte = MiAddressToPte(StartingAddress);
    LastPte = MiAddressToPte(EndingAddress);

    //
    // Make the PDE valid, and check the status of the first PTE
    //
    MiMakePdeExistAndMakeValid(PointerPde, Process, MM_NOIRQL);
    if (PointerPte->u.Long)
    {
        //
        // Not supported in ARM3
        //
        ASSERT(FoundVad->u.VadFlags.VadType != VadRotatePhysical);

        //
        // Capture the page protection and make the PDE valid
        //
        *CapturedOldProtect = MiGetPageProtection(PointerPte);
        MiMakePdeExistAndMakeValid(PointerPde, Process, MM_NOIRQL);
    }
    else
    {
        //
        // Only pagefile-backed section VADs are supported for now
        //
        ASSERT(FoundVad->u.VadFlags.VadType != VadImageMap);

        //
        // Grab the old protection from the VAD itself
        //
        *CapturedOldProtect = MmProtectToValue[FoundVad->u.VadFlags.Protection];
    }

    //
    // Loop all the PTEs now
    //
    MiMakePdeExistAndMakeValid(PointerPde, Process, MM_NOIRQL);
    while (PointerPte <= LastPte)
    {
        //
        // Check if we've crossed a PDE boundary and make the new PDE valid too
        //
        if ((((ULONG_PTR)PointerPte) & (SYSTEM_PD_SIZE - 1)) == 0)
        {
            PointerPde = MiPteToPde(PointerPte);
            MiMakePdeExistAndMakeValid(PointerPde, Process, MM_NOIRQL);
        }

        //
        // Capture the PTE and see what we're dealing with
        //
        PteContents = *PointerPte;
        if (PteContents.u.Long == 0)
        {
            //
            // This used to be a zero PTE and it no longer is, so we must add a
            // reference to the pagetable.
            //
            MiIncrementPageTableReferences(MiPteToAddress(PointerPte));

            //
            // Create the demand-zero prototype PTE
            //
            TempPte = PrototypePte;
            TempPte.u.Soft.Protection = ProtectionMask;
            MI_WRITE_INVALID_PTE(PointerPte, TempPte);
        }
        else if (PteContents.u.Hard.Valid == 1)
        {
            //
            // Get the PFN entry
            //
            Pfn1 = MiGetPfnEntry(PFN_FROM_PTE(&PteContents));

            //
            // We don't support these yet
            //
            ASSERT((NewProtect & (PAGE_NOACCESS | PAGE_GUARD)) == 0);
            ASSERT(Pfn1->u3.e1.PrototypePte == 0);

            //
            // Write the protection mask and write it with a TLB flush
            //
            Pfn1->OriginalPte.u.Soft.Protection = ProtectionMask;
            MiFlushTbAndCapture(FoundVad,
                                PointerPte,
                                ProtectionMask,
                                Pfn1,
                                TRUE);
        }
        else
        {
            //
            // We don't support these cases yet
            //
            ASSERT(PteContents.u.Soft.Prototype == 0);
            ASSERT(PteContents.u.Soft.Transition == 0);

            //
            // The PTE is already demand-zero, just update the protection mask
            //
            PointerPte->u.Soft.Protection = ProtectionMask;
        }

        PointerPte++;
    }

    //
    // Unlock the working set and update quota charges if needed, then return
    //
    MiUnlockProcessWorkingSetUnsafe(Process, Thread);
    if ((QuotaCharge > 0) && (!DontCharge))
    {
        FoundVad->u.VadFlags.CommitCharge -= QuotaCharge;
        Process->CommitCharge -= QuotaCharge;
    }
    return STATUS_SUCCESS;
}

MiSubsectionConsistent()

VOID NTAPI MiSubsectionConsistent

(

IN PSUBSECTION

Subsection

)

Definition at line 1479 of file section.c.

{
    /* ReactOS only supports systems with 4K pages and 4K sectors */
    ASSERT(Subsection->u.SubsectionFlags.SectorEndOffset == 0);

    /* Therefore, then number of PTEs should be equal to the number of sectors */
    if (Subsection->NumberOfFullSectors != Subsection->PtesInSubsection)
    {
        /* Break and warn if this is inconsistent */
        DPRINT1("Mm: Subsection inconsistent (%x vs %x)\n",
                Subsection->NumberOfFullSectors, Subsection->PtesInSubsection);
        DbgBreakPoint();
    }
}

MiUnmapViewInSystemSpace()

NTSTATUS NTAPI MiUnmapViewInSystemSpace	(	IN PMMSESSION	Session,
		IN PVOID	MappedBase
	)

Definition at line 2377 of file section.c.

Referenced by MmUnmapViewInSessionSpace(), and MmUnmapViewInSystemSpace().

{
    ULONG Size;
    PCONTROL_AREA ControlArea;
    PAGED_CODE();

    /* Remove this mapping */
    KeAcquireGuardedMutex(Session->SystemSpaceViewLockPointer);
    Size = MiRemoveFromSystemSpace(Session, MappedBase, &ControlArea);

    /* Clear the bits for this mapping */
    RtlClearBits(Session->SystemSpaceBitMap,
                 (ULONG)(((ULONG_PTR)MappedBase - (ULONG_PTR)Session->SystemSpaceViewStart) >> 16),
                 Size);

    /* Convert the size from a bit size into the actual size */
    Size = Size * (_64K >> PAGE_SHIFT);

    /* Remove the PTEs now */
    MiRemoveMappedPtes(MappedBase, Size, ControlArea, NULL);
    KeReleaseGuardedMutex(Session->SystemSpaceViewLockPointer);

    /* Return success */
    return STATUS_SUCCESS;
}

MiUnmapViewOfSection()

NTSTATUS NTAPI MiUnmapViewOfSection	(	IN PEPROCESS	Process,
		IN PVOID	BaseAddress,
		IN ULONG	Flags
	)

Definition at line 818 of file section.c.

Referenced by MiQueryPageTableReferences(), MmUnmapViewOfSection(), and NtUnmapViewOfSection().

{
    PMEMORY_AREA MemoryArea;
    BOOLEAN Attached = FALSE;
    KAPC_STATE ApcState;
    PMMVAD Vad;
    PVOID DbgBase = NULL;
    SIZE_T RegionSize;
    NTSTATUS Status;
    PETHREAD CurrentThread = PsGetCurrentThread();
    PEPROCESS CurrentProcess = PsGetCurrentProcess();
    PAGED_CODE();

    /* Check for Mm Region */
    MemoryArea = MmLocateMemoryAreaByAddress(&Process->Vm, BaseAddress);
    if ((MemoryArea) && (MemoryArea->Type != MEMORY_AREA_OWNED_BY_ARM3))
    {
        /* Call Mm API */
        return MiRosUnmapViewOfSection(Process, BaseAddress, Process->ProcessExiting);
    }

    /* Check if we should attach to the process */
    if (CurrentProcess != Process)
    {
        /* The process is different, do an attach */
        KeStackAttachProcess(&Process->Pcb, &ApcState);
        Attached = TRUE;
    }

    /* Check if we need to lock the address space */
    if (!Flags) MmLockAddressSpace(&Process->Vm);

    /* Check if the process is already daed */
    if (Process->VmDeleted)
    {
        /* Fail the call */
        DPRINT1("Process died!\n");
        if (!Flags) MmUnlockAddressSpace(&Process->Vm);
        Status = STATUS_PROCESS_IS_TERMINATING;
        goto Quickie;
    }

    /* Find the VAD for the address and make sure it's a section VAD */
    Vad = MiLocateAddress(BaseAddress);
    if (!(Vad) || (Vad->u.VadFlags.PrivateMemory))
    {
        /* Couldn't find it, or invalid VAD, fail */
        DPRINT1("No VAD or invalid VAD\n");
        if (!Flags) MmUnlockAddressSpace(&Process->Vm);
        Status = STATUS_NOT_MAPPED_VIEW;
        goto Quickie;
    }

    /* We should be attached */
    ASSERT(Process == PsGetCurrentProcess());

    /* We need the base address for the debugger message on image-backed VADs */
    if (Vad->u.VadFlags.VadType == VadImageMap)
    {
        DbgBase = (PVOID)(Vad->StartingVpn >> PAGE_SHIFT);
    }

    /* Compute the size of the VAD region */
    RegionSize = PAGE_SIZE + ((Vad->EndingVpn - Vad->StartingVpn) << PAGE_SHIFT);

    /* For SEC_NO_CHANGE sections, we need some extra checks */
    if (Vad->u.VadFlags.NoChange == 1)
    {
        /* Are we allowed to mess with this VAD? */
        Status = MiCheckSecuredVad(Vad,
                                   (PVOID)(Vad->StartingVpn >> PAGE_SHIFT),
                                   RegionSize,
                                   MM_DELETE_CHECK);
        if (!NT_SUCCESS(Status))
        {
            /* We failed */
            DPRINT1("Trying to unmap protected VAD!\n");
            if (!Flags) MmUnlockAddressSpace(&Process->Vm);
            goto Quickie;
        }
    }

    /* Not currently supported */
    ASSERT(Vad->u.VadFlags.VadType != VadRotatePhysical);

    /* FIXME: Remove VAD charges */

    /* Lock the working set */
    MiLockProcessWorkingSetUnsafe(Process, CurrentThread);

    /* Remove the VAD */
    ASSERT(Process->VadRoot.NumberGenericTableElements >= 1);
    MiRemoveNode((PMMADDRESS_NODE)Vad, &Process->VadRoot);

    /* Remove the PTEs for this view, which also releases the working set lock */
    MiRemoveMappedView(Process, Vad);

    /* FIXME: Remove commitment */

    /* Update performance counter and release the lock */
    Process->VirtualSize -= RegionSize;
    if (!Flags) MmUnlockAddressSpace(&Process->Vm);

    /* Destroy the VAD and return success */
    ExFreePool(Vad);
    Status = STATUS_SUCCESS;

    /* Failure and success case -- send debugger message, detach, and return */
Quickie:
    if (DbgBase) DbgkUnMapViewOfSection(DbgBase);
    if (Attached) KeUnstackDetachProcess(&ApcState);
    return Status;
}

MmCommitSessionMappedView()

NTSTATUS NTAPI MmCommitSessionMappedView	(	IN PVOID	MappedBase,
		IN SIZE_T	ViewSize
	)

Definition at line 3084 of file section.c.

{
    ULONG_PTR StartAddress, EndingAddress, Base;
    ULONG Hash, Count = 0, Size, QuotaCharge;
    PMMSESSION Session;
    PMMPTE LastProtoPte, PointerPte, ProtoPte;
    PCONTROL_AREA ControlArea;
    PSEGMENT Segment;
    PSUBSECTION Subsection;
    MMPTE TempPte;
    PAGED_CODE();

    /* Make sure the base isn't past the session view range */
    if ((MappedBase < MiSessionViewStart) ||
        (MappedBase >= (PVOID)((ULONG_PTR)MiSessionViewStart + MmSessionViewSize)))
    {
        DPRINT1("Base outside of valid range\n");
        return STATUS_INVALID_PARAMETER_1;
    }

    /* Make sure the size isn't past the session view range */
    if (((ULONG_PTR)MiSessionViewStart + MmSessionViewSize -
        (ULONG_PTR)MappedBase) < ViewSize)
    {
        DPRINT1("Size outside of valid range\n");
        return STATUS_INVALID_PARAMETER_2;
    }

    /* Sanity check */
    ASSERT(ViewSize != 0);

    /* Process must be in a session */
    if (PsGetCurrentProcess()->ProcessInSession == FALSE)
    {
        DPRINT1("Process is not in session\n");
        return STATUS_NOT_MAPPED_VIEW;
    }

    /* Compute the correctly aligned base and end addresses */
    StartAddress = (ULONG_PTR)PAGE_ALIGN(MappedBase);
    EndingAddress = ((ULONG_PTR)MappedBase + ViewSize - 1) | (PAGE_SIZE - 1);

    /* Sanity check and grab the session */
    ASSERT(MmIsAddressValid(MmSessionSpace) == TRUE);
    Session = &MmSessionSpace->Session;

    /* Get the hash entry for this allocation */
    Hash = (StartAddress >> 16) % Session->SystemSpaceHashKey;

    /* Lock system space */
    KeAcquireGuardedMutex(Session->SystemSpaceViewLockPointer);

    /* Loop twice so we can try rolling over if needed */
    while (TRUE)
    {
        /* Extract the size and base addresses from the entry */
        Base = Session->SystemSpaceViewTable[Hash].Entry & ~0xFFFF;
        Size = Session->SystemSpaceViewTable[Hash].Entry & 0xFFFF;

        /* Convert the size to bucket chunks */
        Size *= MI_SYSTEM_VIEW_BUCKET_SIZE;

        /* Bail out if this entry fits in here */
        if ((StartAddress >= Base) && (EndingAddress < (Base + Size))) break;

        /* Check if we overflew past the end of the hash table */
        if (++Hash >= Session->SystemSpaceHashSize)
        {
            /* Reset the hash to zero and keep searching from the bottom */
            Hash = 0;
            if (++Count == 2)
            {
                /* But if we overflew twice, then this is not a real mapping */
                KeBugCheckEx(DRIVER_UNMAPPING_INVALID_VIEW,
                             Base,
                             2,
                             0,
                             0);
            }
        }
    }

    /* Make sure the view being mapped is not file-based */
    ControlArea = Session->SystemSpaceViewTable[Hash].ControlArea;
    if (ControlArea->FilePointer != NULL)
    {
        /* It is, so we have to bail out */
        DPRINT1("Only page-filed backed sections can be commited\n");
        KeReleaseGuardedMutex(Session->SystemSpaceViewLockPointer);
        return STATUS_ALREADY_COMMITTED;
    }

    /* Get the subsection. We don't support LARGE_CONTROL_AREA in ARM3 */
    ASSERT(ControlArea->u.Flags.GlobalOnlyPerSession == 0);
    ASSERT(ControlArea->u.Flags.Rom == 0);
    Subsection = (PSUBSECTION)(ControlArea + 1);

    /* Get the start and end PTEs -- make sure the end PTE isn't past the end */
    ProtoPte = Subsection->SubsectionBase + ((StartAddress - Base) >> PAGE_SHIFT);
    QuotaCharge = MiAddressToPte(EndingAddress) - MiAddressToPte(StartAddress) + 1;
    LastProtoPte = ProtoPte + QuotaCharge;
    if (LastProtoPte >= Subsection->SubsectionBase + Subsection->PtesInSubsection)
    {
        DPRINT1("PTE is out of bounds\n");
        KeReleaseGuardedMutex(Session->SystemSpaceViewLockPointer);
        return STATUS_INVALID_PARAMETER_2;
    }

    /* Acquire the commit lock and count all the non-committed PTEs */
    KeAcquireGuardedMutexUnsafe(&MmSectionCommitMutex);
    PointerPte = ProtoPte;
    while (PointerPte < LastProtoPte)
    {
        if (PointerPte->u.Long) QuotaCharge--;
        PointerPte++;
    }

    /* Was everything committed already? */
    if (!QuotaCharge)
    {
        /* Nothing to do! */
        KeReleaseGuardedMutexUnsafe(&MmSectionCommitMutex);
        KeReleaseGuardedMutex(Session->SystemSpaceViewLockPointer);
        return STATUS_SUCCESS;
    }

    /* Pick the segment and template PTE */
    Segment = ControlArea->Segment;
    TempPte = Segment->SegmentPteTemplate;
    ASSERT(TempPte.u.Long != 0);

    /* Loop all prototype PTEs to be committed */
    PointerPte = ProtoPte;
    while (PointerPte < LastProtoPte)
    {
        /* Make sure the PTE is already invalid */
        if (PointerPte->u.Long == 0)
        {
            /* And write the invalid PTE */
            MI_WRITE_INVALID_PTE(PointerPte, TempPte);
        }

        /* Move to the next PTE */
        PointerPte++;
    }

    /* Check if we had at least one page charged */
    if (QuotaCharge)
    {
        /* Update the accounting data */
        Segment->NumberOfCommittedPages += QuotaCharge;
        InterlockedExchangeAddSizeT(&MmSharedCommit, QuotaCharge);
    }

    /* Release all */
    KeReleaseGuardedMutexUnsafe(&MmSectionCommitMutex);
    KeReleaseGuardedMutex(Session->SystemSpaceViewLockPointer);
    return STATUS_SUCCESS;
}

MmCreateArm3Section()

NTSTATUS NTAPI MmCreateArm3Section	(	OUT PVOID *	SectionObject,
		IN ACCESS_MASK	DesiredAccess,
		IN POBJECT_ATTRIBUTES ObjectAttributes	OPTIONAL,
		IN PLARGE_INTEGER	InputMaximumSize,
		IN ULONG	SectionPageProtection,
		IN ULONG	AllocationAttributes,
		IN HANDLE FileHandle	OPTIONAL,
		IN PFILE_OBJECT FileObject	OPTIONAL
	)

Definition at line 2411 of file section.c.

Referenced by MmCreateSection().

{
    SECTION Section;
    PSECTION NewSection;
    PSUBSECTION Subsection;
    PSEGMENT NewSegment, Segment;
    NTSTATUS Status;
    PCONTROL_AREA ControlArea;
    ULONG ProtectionMask, ControlAreaSize, Size, NonPagedCharge, PagedCharge;
    KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
    BOOLEAN FileLock = FALSE, KernelCall = FALSE;
    KIRQL OldIrql;
    PFILE_OBJECT File;
    BOOLEAN UserRefIncremented = FALSE;
    PVOID PreviousSectionPointer;

    /* Make the same sanity checks that the Nt interface should've validated */
    ASSERT((AllocationAttributes & ~(SEC_COMMIT | SEC_RESERVE | SEC_BASED |
                                     SEC_LARGE_PAGES | SEC_IMAGE | SEC_NOCACHE |
                                     SEC_NO_CHANGE)) == 0);
    ASSERT((AllocationAttributes & (SEC_COMMIT | SEC_RESERVE | SEC_IMAGE)) != 0);
    ASSERT(!((AllocationAttributes & SEC_IMAGE) &&
             (AllocationAttributes & (SEC_COMMIT | SEC_RESERVE |
                                      SEC_NOCACHE | SEC_NO_CHANGE))));
    ASSERT(!((AllocationAttributes & SEC_COMMIT) && (AllocationAttributes & SEC_RESERVE)));
    ASSERT(!((SectionPageProtection & PAGE_NOCACHE) ||
             (SectionPageProtection & PAGE_WRITECOMBINE) ||
             (SectionPageProtection & PAGE_GUARD) ||
             (SectionPageProtection & PAGE_NOACCESS)));

    /* Convert section flag to page flag */
    if (AllocationAttributes & SEC_NOCACHE) SectionPageProtection |= PAGE_NOCACHE;

    /* Check to make sure the protection is correct. Nt* does this already */
    ProtectionMask = MiMakeProtectionMask(SectionPageProtection);
    if (ProtectionMask == MM_INVALID_PROTECTION) return STATUS_INVALID_PAGE_PROTECTION;

    /* Check if this is going to be a data or image backed file section */
    if ((FileHandle) || (FileObject))
    {
        /* These cannot be mapped with large pages */
        if (AllocationAttributes & SEC_LARGE_PAGES) return STATUS_INVALID_PARAMETER_6;

        /* For now, only support the mechanism through a file handle */
        ASSERT(FileObject == NULL);

        /* Reference the file handle to get the object */
        Status = ObReferenceObjectByHandle(FileHandle,
                                           MmMakeFileAccess[ProtectionMask],
                                           IoFileObjectType,
                                           PreviousMode,
                                           (PVOID*)&File,
                                           NULL);
        if (!NT_SUCCESS(Status)) return Status;

        /* Make sure Cc has been doing its job */
        if (!File->SectionObjectPointer)
        {
            /* This is not a valid file system-based file, fail */
            ObDereferenceObject(File);
            return STATUS_INVALID_FILE_FOR_SECTION;
        }

        /* Image-file backed sections are not yet supported */
        ASSERT((AllocationAttributes & SEC_IMAGE) == 0);

        /* Compute the size of the control area, and allocate it */
        ControlAreaSize = sizeof(CONTROL_AREA) + sizeof(MSUBSECTION);
        ControlArea = ExAllocatePoolWithTag(NonPagedPool, ControlAreaSize, 'aCmM');
        if (!ControlArea)
        {
            ObDereferenceObject(File);
            return STATUS_INSUFFICIENT_RESOURCES;
        }

        /* Zero it out */
        RtlZeroMemory(ControlArea, ControlAreaSize);

        /* Did we get a handle, or an object? */
        if (FileHandle)
        {
            /* We got a file handle so we have to lock down the file */
#if 0
            Status = FsRtlAcquireToCreateMappedSection(File, SectionPageProtection);
            if (!NT_SUCCESS(Status))
            {
                ExFreePool(ControlArea);
                ObDereferenceObject(File);
                return Status;
            }
#else
            /* ReactOS doesn't support this API yet, so do nothing */
            Status = STATUS_SUCCESS;
#endif
            /* Update the top-level IRP so that drivers know what's happening */
            IoSetTopLevelIrp((PIRP)FSRTL_FSP_TOP_LEVEL_IRP);
            FileLock = TRUE;
        }

        /* Lock the PFN database while we play with the section pointers */
        OldIrql = MiAcquirePfnLock();

        /* Image-file backed sections are not yet supported */
        ASSERT((AllocationAttributes & SEC_IMAGE) == 0);

        /* There should not already be a control area for this file */
        ASSERT(File->SectionObjectPointer->DataSectionObject == NULL);
        NewSegment = NULL;

        /* Write down that this CA is being created, and set it */
        ControlArea->u.Flags.BeingCreated = TRUE;
        ASSERT((AllocationAttributes & SEC_IMAGE) == 0);
        PreviousSectionPointer = File->SectionObjectPointer;
        File->SectionObjectPointer->DataSectionObject = ControlArea;

        /* We can release the PFN lock now */
        MiReleasePfnLock(OldIrql);

        /* We don't support previously-mapped file */
        ASSERT(NewSegment == NULL);

        /* Image-file backed sections are not yet supported */
        ASSERT((AllocationAttributes & SEC_IMAGE) == 0);

        /* So we always create a data file map */
        Status = MiCreateDataFileMap(File,
                                     &Segment,
                                     (PSIZE_T)InputMaximumSize,
                                     SectionPageProtection,
                                     AllocationAttributes,
                                     KernelCall);
        if (!NT_SUCCESS(Status))
        {
            /* Lock the PFN database while we play with the section pointers */
            OldIrql = MiAcquirePfnLock();

            /* Reset the waiting-for-deletion event */
            ASSERT(ControlArea->WaitingForDeletion == NULL);
            ControlArea->WaitingForDeletion = NULL;

            /* Set the file pointer NULL flag */
            ASSERT(ControlArea->u.Flags.FilePointerNull == 0);
            ControlArea->u.Flags.FilePointerNull = TRUE;

            /* Delete the data section object */
            ASSERT((AllocationAttributes & SEC_IMAGE) == 0);
            File->SectionObjectPointer->DataSectionObject = NULL;

            /* No longer being created */
            ControlArea->u.Flags.BeingCreated = FALSE;

            /* We can release the PFN lock now */
            MiReleasePfnLock(OldIrql);

            /* Check if we locked and set the IRP */
            if (FileLock)
            {
                /* Undo */
                IoSetTopLevelIrp(NULL);
                //FsRtlReleaseFile(File);
            }

            /* Free the control area and de-ref the file object */
            ExFreePool(ControlArea);
            ObDereferenceObject(File);

            /* All done */
            return Status;
        }

        /* On success, we expect this */
        ASSERT(PreviousSectionPointer == File->SectionObjectPointer);

        /* Check if a maximum size was specified */
        if (!InputMaximumSize->QuadPart)
        {
            /* Nope, use the segment size */
            Section.SizeOfSection.QuadPart = (LONGLONG)Segment->SizeOfSegment;
        }
        else
        {
            /* Yep, use the entered size */
            Section.SizeOfSection.QuadPart = InputMaximumSize->QuadPart;
        }
    }
    else
    {
        /* A handle must be supplied with SEC_IMAGE, as this is the no-handle path */
        if (AllocationAttributes & SEC_IMAGE) return STATUS_INVALID_FILE_FOR_SECTION;

        /* Not yet supported */
        ASSERT((AllocationAttributes & SEC_LARGE_PAGES) == 0);

        /* So this must be a pagefile-backed section, create the mappings needed */
        Status = MiCreatePagingFileMap(&NewSegment,
                                       (PSIZE_T)InputMaximumSize,
                                       ProtectionMask,
                                       AllocationAttributes);
        if (!NT_SUCCESS(Status)) return Status;

        /* Set the size here, and read the control area */
        Section.SizeOfSection.QuadPart = NewSegment->SizeOfSegment;
        ControlArea = NewSegment->ControlArea;

        /* MiCreatePagingFileMap increments user references */
        UserRefIncremented = TRUE;
    }

    /* Did we already have a segment? */
    if (!NewSegment)
    {
        /* This must be the file path and we created a segment */
        NewSegment = Segment;
        ASSERT(File != NULL);

        /* Acquire the PFN lock while we set control area flags */
        OldIrql = MiAcquirePfnLock();

        /* We don't support this race condition yet, so assume no waiters */
        ASSERT(ControlArea->WaitingForDeletion == NULL);
        ControlArea->WaitingForDeletion = NULL;

        /* Image-file backed sections are not yet supported, nor ROM images */
        ASSERT((AllocationAttributes & SEC_IMAGE) == 0);
        ASSERT(Segment->ControlArea->u.Flags.Rom == 0);

        /* Take off the being created flag, and then release the lock */
        ControlArea->u.Flags.BeingCreated = FALSE;
        MiReleasePfnLock(OldIrql);
    }

    /* Check if we locked the file earlier */
    if (FileLock)
    {
        /* Reset the top-level IRP and release the lock */
        IoSetTopLevelIrp(NULL);
        //FsRtlReleaseFile(File);
        FileLock = FALSE;
    }

    /* Set the initial section object data */
    Section.InitialPageProtection = SectionPageProtection;

    /* The mapping created a control area and segment, save the flags */
    Section.Segment = NewSegment;
    Section.u.LongFlags = ControlArea->u.LongFlags;

    /* Check if this is a user-mode read-write non-image file mapping */
    if (!(FileObject) &&
        (SectionPageProtection & (PAGE_READWRITE | PAGE_EXECUTE_READWRITE)) &&
        !(ControlArea->u.Flags.Image) &&
        (ControlArea->FilePointer))
    {
        /* Add a reference and set the flag */
        Section.u.Flags.UserWritable = TRUE;
        InterlockedIncrement((volatile LONG*)&ControlArea->WritableUserReferences);
    }

    /* Check for image mappings or page file mappings */
    if ((ControlArea->u.Flags.Image) || !(ControlArea->FilePointer))
    {
        /* Charge the segment size, and allocate a subsection */
        PagedCharge = sizeof(SECTION) + NewSegment->TotalNumberOfPtes * sizeof(MMPTE);
        Size = sizeof(SUBSECTION);
    }
    else
    {
        /* Charge nothing, and allocate a mapped subsection */
        PagedCharge = 0;
        Size = sizeof(MSUBSECTION);
    }

    /* Check if this is a normal CA */
    ASSERT(ControlArea->u.Flags.GlobalOnlyPerSession == 0);
    ASSERT(ControlArea->u.Flags.Rom == 0);

    /* Charge only a CA, and the subsection is right after */
    NonPagedCharge = sizeof(CONTROL_AREA);
    Subsection = (PSUBSECTION)(ControlArea + 1);

    /* We only support single-subsection mappings */
    NonPagedCharge += Size;
    ASSERT(Subsection->NextSubsection == NULL);

    /* Create the actual section object, with enough space for the prototype PTEs */
    Status = ObCreateObject(PreviousMode,
                            MmSectionObjectType,
                            ObjectAttributes,
                            PreviousMode,
                            NULL,
                            sizeof(SECTION),
                            PagedCharge,
                            NonPagedCharge,
                            (PVOID*)&NewSection);
    if (!NT_SUCCESS(Status))
    {
        /* Check if this is a user-mode read-write non-image file mapping */
        if (!(FileObject) &&
            (SectionPageProtection & (PAGE_READWRITE | PAGE_EXECUTE_READWRITE)) &&
            !(ControlArea->u.Flags.Image) &&
            (ControlArea->FilePointer))
        {
            /* Remove a reference and check the flag */
            ASSERT(Section.u.Flags.UserWritable == 1);
            InterlockedDecrement((volatile LONG*)&ControlArea->WritableUserReferences);
        }

        /* Check if a user reference was added */
        if (UserRefIncremented)
        {
            /* Acquire the PFN lock while we change counters */
            OldIrql = MiAcquirePfnLock();

            /* Decrement the accounting counters */
            ControlArea->NumberOfSectionReferences--;
            ASSERT((LONG)ControlArea->NumberOfUserReferences > 0);
            ControlArea->NumberOfUserReferences--;

            /* Check if we should destroy the CA and release the lock */
            MiCheckControlArea(ControlArea, OldIrql);
        }

        /* Return the failure code */
        return Status;
    }

    /* NOTE: Past this point, all failures will be handled by Ob upon ref->0 */

    /* Now copy the local section object from the stack into this new object */
    RtlCopyMemory(NewSection, &Section, sizeof(SECTION));
    NewSection->Address.StartingVpn = 0;

    /* For now, only user calls are supported */
    ASSERT(KernelCall == FALSE);
    NewSection->u.Flags.UserReference = TRUE;

    /* Is this a "based" allocation, in which all mappings are identical? */
    if (AllocationAttributes & SEC_BASED)
    {
        /* Lock the VAD tree during the search */
        KeAcquireGuardedMutex(&MmSectionBasedMutex);

        /* Is it a brand new ControArea ? */
        if (ControlArea->u.Flags.BeingCreated == 1)
        {
            ASSERT(ControlArea->u.Flags.Based == 1);
            /* Then we must find a global address, top-down */
            Status = MiFindEmptyAddressRangeDownBasedTree((SIZE_T)ControlArea->Segment->SizeOfSegment,
                                                          (ULONG_PTR)MmHighSectionBase,
                                                          _64K,
                                                          &MmSectionBasedRoot,
                                                          (ULONG_PTR*)&ControlArea->Segment->BasedAddress);

            if (!NT_SUCCESS(Status))
            {
                /* No way to find a valid range. */
                KeReleaseGuardedMutex(&MmSectionBasedMutex);
                ControlArea->u.Flags.Based = 0;
                NewSection->u.Flags.Based = 0;
                ObDereferenceObject(NewSection);
                return Status;
            }

            /* Compute the ending address and insert it into the VAD tree */
            NewSection->Address.StartingVpn = (ULONG_PTR)ControlArea->Segment->BasedAddress;
            NewSection->Address.EndingVpn = NewSection->Address.StartingVpn + NewSection->SizeOfSection.LowPart - 1;
            MiInsertBasedSection(NewSection);
        }
        else
        {
            /* FIXME : Should we deny section creation if SEC_BASED is not set ? Can we have two different section objects on the same based address ? Investigate !*/
            ASSERT(FALSE);
        }

        KeReleaseGuardedMutex(&MmSectionBasedMutex);
    }

    /* The control area is not being created anymore */
    if (ControlArea->u.Flags.BeingCreated == 1)
    {
        /* Acquire the PFN lock while we set control area flags */
        OldIrql = MiAcquirePfnLock();

        /* Take off the being created flag, and then release the lock */
        ControlArea->u.Flags.BeingCreated = 0;
        NewSection->u.Flags.BeingCreated = 0;

        MiReleasePfnLock(OldIrql);
    }

    /* Migrate the attribute into a flag */
    if (AllocationAttributes & SEC_NO_CHANGE) NewSection->u.Flags.NoChange = TRUE;

    /* If R/W access is not requested, this might eventually become a CoW mapping */
    if (!(SectionPageProtection & (PAGE_READWRITE | PAGE_EXECUTE_READWRITE)))
    {
        NewSection->u.Flags.CopyOnWrite = TRUE;
    }

    /* Write down if this was a kernel call */
    ControlArea->u.Flags.WasPurged |= KernelCall;
    ASSERT(ControlArea->u.Flags.WasPurged == FALSE);

    /* Make sure the segment and the section are the same size, or the section is smaller */
    ASSERT((ULONG64)NewSection->SizeOfSection.QuadPart <= NewSection->Segment->SizeOfSegment);

    /* Return the object and the creation status */
    *SectionObject = (PVOID)NewSection;
    return Status;
}