NTSTATUS NTAPI MmCreateVirtualMappingUnsafe	(	PEPROCESS	Process,
		PVOID	Address,
		ULONG	flProtect,
		PPFN_NUMBER	Pages,
		ULONG	PageCount
	)
Definition at line 767 of file page.c.
{
    ULONG Attributes;
    PVOID Addr;
    ULONG i;
    ULONG oldPdeOffset, PdeOffset;
    PULONG Pt = NULL;
    ULONG Pte;
    DPRINT("MmCreateVirtualMappingUnsafe(%x, %x, %x, %x (%x), %d)\n",
           Process, Address, flProtect, Pages, *Pages, PageCount);

    ASSERT(((ULONG_PTR)Address % PAGE_SIZE) == 0);

    if (Process == NULL)
    {
        if (Address < MmSystemRangeStart)
        {
            DPRINT1("No process\n");
            KeBugCheck(MEMORY_MANAGEMENT);
        }
        if (PageCount > 0x10000 ||
            (ULONG_PTR) Address / PAGE_SIZE + PageCount > 0x100000)
        {
            DPRINT1("Page count too large\n");
            KeBugCheck(MEMORY_MANAGEMENT);
        }
    }
    else
    {
        if (Address >= MmSystemRangeStart)
        {
            DPRINT1("Setting kernel address with process context\n");
            KeBugCheck(MEMORY_MANAGEMENT);
        }
        if (PageCount > (ULONG_PTR)MmSystemRangeStart / PAGE_SIZE ||
            (ULONG_PTR) Address / PAGE_SIZE + PageCount >
            (ULONG_PTR)MmSystemRangeStart / PAGE_SIZE)
        {
            DPRINT1("Page Count too large\n");
            KeBugCheck(MEMORY_MANAGEMENT);
        }
    }

    Attributes = ProtectToPTE(flProtect);
    Attributes &= 0xfff;
    if (Address >= MmSystemRangeStart)
    {
        Attributes &= ~PA_USER;
    }
    else
    {
        Attributes |= PA_USER;
    }

    Addr = Address;
    /* MmGetPageTableForProcess should be called on the first run, so
     * let this trigger it */
    oldPdeOffset = ADDR_TO_PDE_OFFSET(Addr) + 1;
    for (i = 0; i < PageCount; i++, Addr = (PVOID)((ULONG_PTR)Addr + PAGE_SIZE))
    {
        if (!(Attributes & PA_PRESENT) && Pages[i] != 0)
        {
            DPRINT1("Setting physical address but not allowing access at address "
                    "0x%.8X with attributes %x/%x.\n",
                    Addr, Attributes, flProtect);
            KeBugCheck(MEMORY_MANAGEMENT);
        }
        PdeOffset = ADDR_TO_PDE_OFFSET(Addr);
        if (oldPdeOffset != PdeOffset)
        {
            if(Pt) MmUnmapPageTable(Pt);
            Pt = MmGetPageTableForProcess(Process, Addr, TRUE);
            if (Pt == NULL)
            {
                KeBugCheck(MEMORY_MANAGEMENT);
            }
        }
        else
        {
            Pt++;
        }
        oldPdeOffset = PdeOffset;

        Pte = InterlockedExchangePte(Pt, PFN_TO_PTE(Pages[i]) | Attributes);

        /* There should not be anything valid here */
        if (Pte != 0)
        {
            DPRINT1("Bad PTE %lx\n", Pte);
            KeBugCheck(MEMORY_MANAGEMENT);
        }

        /* We don't need to flush the TLB here because it only caches valid translations
         * and we're moving this PTE from invalid to valid so it can't be cached right now */

        if (Addr < MmSystemRangeStart)
        {
            /* Add PDE reference */
            Process->Vm.VmWorkingSetList->UsedPageTableEntries[MiGetPdeOffset(Addr)]++;
            ASSERT(Process->Vm.VmWorkingSetList->UsedPageTableEntries[MiGetPdeOffset(Addr)] <= PTE_COUNT);
        }
    }

    ASSERT(Addr > Address);
    MmUnmapPageTable(Pt);

    return(STATUS_SUCCESS);
}
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