Memory Management in Pentium Harshad Kasture (01D07033) Saurabh Goyal (01D07035)

Outline Pentium General Memory Management Pentium Paging Segmentation Pentium Segmentation

MMU in Pentium Logical to Physical Address Translation in Pentium

Segmentation

Pentium Segmentation I

Pentium Segmentation

Protection Levels in Pentium 1312 (16 bit Selector) Protection Bits

Pentium Paging Pages can be of 4 MB each. Directory entry directly point to a Page in this case.

Pentium General Memory Management Each segment can grow dynamically, so segments have to be paged

Segmentation with Paging: Another example Differs from pure segmentation in that the segment-table entry contains not the base address of the segment, but rather the base address of a page table for this segment

Linux on Pentium Systems Uses only 6 segments Uses 2 out of 4 modes of protection Linear Address in Linux Middle directory = 0 bits when used in Pentium

References Memory Systems and Pipelined Processors; Harvery G. Cragon; Narosa Publishing House Operating System Principles; Silberschatz, Galvin, Gagne; John Wiley and Sons slides/Day22_files/

References = ode/introduction.htm ode/protmode.htm

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