NTSTATUS NTAPI MmGrowKernelStackEx	(	IN PVOID	StackPointer,
		IN ULONG	GrowSize
	)
Definition at line 427 of file procsup.c.
Referenced by MmGrowKernelStack().
{
    PKTHREAD Thread = KeGetCurrentThread();
    PMMPTE LimitPte, NewLimitPte, LastPte;
    KIRQL OldIrql;
    MMPTE TempPte, InvalidPte;
    PFN_NUMBER PageFrameIndex;

    //
    // Make sure the stack did not overflow
    //
    ASSERT(((ULONG_PTR)Thread->StackBase - (ULONG_PTR)Thread->StackLimit) <=
           (KERNEL_LARGE_STACK_SIZE + PAGE_SIZE));

    //
    // Get the current stack limit
    //
    LimitPte = MiAddressToPte(Thread->StackLimit);
    ASSERT(LimitPte->u.Hard.Valid == 1);

    //
    // Get the new one and make sure this isn't a retarded request
    //
    NewLimitPte = MiAddressToPte((PVOID)((ULONG_PTR)StackPointer - GrowSize));
    if (NewLimitPte == LimitPte) return STATUS_SUCCESS;

    //
    // Now make sure you're not going past the reserved space
    //
    LastPte = MiAddressToPte((PVOID)((ULONG_PTR)Thread->StackBase -
                                     KERNEL_LARGE_STACK_SIZE));
    if (NewLimitPte < LastPte)
    {
        //
        // Sorry!
        //
        DPRINT1("Thread wants too much stack\n");
        return STATUS_STACK_OVERFLOW;
    }

    //
    // Calculate the number of new pages
    //
    LimitPte--;

    /* Setup the temporary invalid PTE */
    MI_MAKE_SOFTWARE_PTE(&InvalidPte, MM_NOACCESS);

    //
    // Acquire the PFN DB lock
    //
    OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);

    //
    // Loop each stack page
    //
    while (LimitPte >= NewLimitPte)
    {
        /* Get a page and write the current invalid PTE */
        MI_SET_USAGE(MI_USAGE_KERNEL_STACK_EXPANSION);
        MI_SET_PROCESS2(PsGetCurrentProcess()->ImageFileName);
        PageFrameIndex = MiRemoveAnyPage(MI_GET_NEXT_COLOR());
        MI_WRITE_INVALID_PTE(LimitPte, InvalidPte);

        /* Initialize the PFN entry for this page */
        MiInitializePfn(PageFrameIndex, LimitPte, 1);

        /* Setup the template stack PTE */
        MI_MAKE_HARDWARE_PTE_KERNEL(&TempPte, LimitPte, MM_READWRITE, PageFrameIndex);

        /* Write the valid PTE */
        MI_WRITE_VALID_PTE(LimitPte--, TempPte);
    }

    //
    // Release the PFN lock
    //
    KeReleaseQueuedSpinLock(LockQueuePfnLock, OldIrql);

    //
    // Set the new limit
    //
    Thread->StackLimit = (ULONG_PTR)MiPteToAddress(NewLimitPte);
    return STATUS_SUCCESS;
}
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