                                       CR3

Control Register 3


Graphical Breakdown:

bits
      31                           11 10       5 4     3 2          0
      [  Page Directory Base Address | Reserved |PCD|PWT| Reserved  ]
                                                  |   |
                                                  |   |
                                                  |   |
                               Page Cache Disable *   |
                                   Page Write-Through *

(PCD & PWT were not implemented until 486)

CR3 "Page Directory Base Address Register".  Only effective if in protected mode
and you have paging turned on.  After Reset CR3 = 0.

CR3 is available on 386+ Processors.
