/INVALID_PFN [=option]

    The /INVALID_PFN qualifier, which is valid only on platforms that
    supply an I/O memory map, causes SDA to display only page table
    entries that map to PFNs that are not in the system's private
    memory or in Galaxy-shared memory, and which are not I/O access
    pages. Use of /INVALID_PFN implies /PAGE_TABLES.

    The /INVALID_PFN qualifier allows two optional keywords, READONLY
    and WRITABLE. If neither keyword is given, all relevant pages
    are displayed. If you specify READONLY, only pages marked for no
    write access are displayed. If you specify WRITABLE, only pages
    that allow write access are displayed. For example, SHOW PROCESS
    ALL/PAGE_TABLE=ALL/INVALID_PFN=WRITABLE would display all process
    pages (for all processes) whose protection allows write, but
    which map to PFNs that do not belong to this system.