Page 55 - slides.dvi
P. 55

•
                                    •
               •
                             •
   Operating
                             First
                                    Page
               Results
                      Address
   Systems
                                                                                                               Example:
                                    size
   —
                      of
                             lookup
                                    4K
                             is
   Paging
                                                                                                               x86
                      page
                                    (or
                             in
               (normally)
               in
                             the
                                                                                                   L1
                                    4Mb).
               the
                      directory
                             page
                                                                                                   L2
                                                                     1024
                                                                  entries
                                                                                                      Virtual Address
                      stored
               address
                                                                                       20 bits
                                                                                  PTA
                      in
                                                                                                   Offset
               of
                             directory:
               a

               page
                      internal
                             index
                                                                                  IGN
                                                                                   P
                                                                                 S
                                                                                   Z
                                                                                 O
                             using
               table.
                                                                                 C
                                                                                   A
                                                                                   C
                                                                                 D
                                                                                             Page Directory (Level 1)
                      processor
                                                                                 T
                                                                                   W
                             most
                                                                                 S
                                                                                   U
                                                                                 W
                                                                                   R
                             10
                                                                                 D
                                                                                   V
                      register
                      (cr3).
                             significant




                             bits.







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