Function WritePhysicalAddress

Driver/core.cpp:99–117

MmMapIoSpaceEx limit is page 4096 byte

    //MmMapIoSpaceEx limit is page 4096 byte
    NTSTATUS WritePhysicalAddress(uint64_t TargetAddress, PVOID lpBuffer, SIZE_T Size, SIZE_T* BytesWritten)
    {
        if (!TargetAddress)
            return STATUS_UNSUCCESSFUL;

        PHYSICAL_ADDRESS AddrToWrite = { 0 };
        AddrToWrite.QuadPart = TargetAddress;

        PVOID pmapped_mem = MmMapIoSpaceEx(AddrToWrite, Size, PAGE_READWRITE);

        if (!pmapped_mem)
            return STATUS_UNSUCCESSFUL;

        memcpy(pmapped_mem, lpBuffer, Size);

        *BytesWritten = Size;
        MmUnmapIoSpace(pmapped_mem, Size);
        return STATUS_SUCCESS;
    }

#define PAGE_OFFSET_SIZE 12
    static const uint64_t PMASK = (~0xfull << 8) & 0xfffffffffull;