Function MapTitleEsramPages

projects/WinDurango.KernelX/src/kernelx.cpp:545–587

        !VirtualAddress || !VirtualQuery(VirtualAddress, &mbi, sizeof(mbi)) || mbi.State == MEM_FREE)
    {
        VirtualAddress = EraVirtualAlloc(VirtualAddress, NumberOfPages * PAGE_SIZE_64K, MEM_RESERVE | flAllocationType,
                                         PAGE_NOACCESS);

        if (!VirtualAddress)
        {
            return nullptr;
        }
    }

    for (ULONG_PTR i = 0; i < NumberOfPages; i += RegionSize)
    {
        ULONG_PTR PhysicalOffset = PAGE_SIZE_64K * PageArray[i];
        PVOID PageVirtualAddress = (PVOID)((ULONG_PTR)VirtualAddress + i * PAGE_SIZE_64K);
        UnmapViewOfFile2(GetCurrentProcess(), PageVirtualAddress, MEM_PRESERVE_PLACEHOLDER);
        MapViewOfFile3(XwpPhysicalMemory, nullptr, PageVirtualAddress, PhysicalOffset, dwPageSize,
                       MEM_REPLACE_PLACEHOLDER, PAGE_READWRITE, nullptr, 0);
        VirtualAlloc2(nullptr, PageVirtualAddress, dwPageSize, MEM_COMMIT, flProtect & PAGE_MASK, nullptr, 0);
    }

    SetLastError(ERROR_SUCCESS);
    return VirtualAddress;
}

EXTERN_C HRESULT __stdcall MapTitleEsramPages(PVOID VirtualAddress, UINT NumberOfPages, DWORD flAllocationType,
                                              UINT const *PageArray)
{
    if (!VirtualAddress || (flAllocationType & (MEM_LARGE_PAGES | MEM_4MB_PAGES)) == 0 ||
        (flAllocationType & (MEM_LARGE_PAGES | MEM_4MB_PAGES)) == (MEM_LARGE_PAGES | MEM_4MB_PAGES))
    {
        return E_INVALIDARG;
    }

    SIZE_T dwPageSize = (flAllocationType & MEM_LARGE_PAGES) ? PAGE_SIZE_64K : PAGE_SIZE_4MB;

    if (NumberOfPages * dwPageSize > MEM_ESRAM_SIZE)
        return E_INVALIDARG;

    if ((ULONG_PTR)VirtualAddress & (dwPageSize - 1))
        return E_INVALIDARG;

    if (!PageArray)
    {
        for (ULONG_PTR dwOffset = 0; dwOffset < NumberOfPages * dwPageSize; dwOffset += dwPageSize)
        {
            PVOID PageAddress = (PVOID)((ULONG_PTR)VirtualAddress + dwOffset);
            UnmapViewOfFile2(GetCurrentProcess(), PageAddress, MEM_PRESERVE_PLACEHOLDER);