PVOID
MiMapPageToZeroInHyperSpace(
  IN  PFN_NUMBER PageFrameIndex
  );

Routine Description:

    This procedure maps the specified physical page into hyper space
    and returns the virtual address which maps the page.

    NOTE: it maps it into the same location reserved for zeroing operations.
    This is only to be used by the zeroing page thread.

Arguments:

    PageFrameIndex - Supplies the physical page number to map.

Return Value:

    Returns the virtual address where the specified physical page was
    mapped.

Environment:

    Must be holding the PFN lock.