Introduction to the Pentium’s support for “virtual” memory

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Presentation transcript:

Introduction to the Pentium’s support for “virtual” memory IA32 Paging Scheme Introduction to the Pentium’s support for “virtual” memory

Two-Level Translation Scheme PAGE TABLES PAGE DIRECTORY PAGE FRAMES CR3

Format of a Page-Table entry 31 12 11 10 9 8 7 6 5 4 3 2 1 0 PAGE-FRAME BASE ADDRESS AVAIL D A P C D P W T U W P LEGEND P = Present (1=yes, 0=no) W = Writable (1 = yes, 0 = no) U = User (1 = yes, 0 = no) A = Accessed (1 = yes, 0 = no) D = Dirty (1 = yes, 0 = no) PWT = Page Write-Through (1=yes, 0 = no) PCD = Page Cache-Disable (1 = yes, 0 = no)

Format of a Page-Directory entry 31 12 11 10 9 8 7 6 5 4 3 2 1 0 PAGE-TABLE BASE ADDRESS AVAIL P S A P C D P W T U W P LEGEND P = Present (1=yes, 0=no) W = Writable (1 = yes, 0 = no) U = User (1 = yes, 0 = no) A = Accessed (1 = yes, 0 = no) PS = Page-Size (0=4KB, 1 = 4MB) PWT = Page Write-Through (1=yes, 0 = no) PCD = Page Cache-Disable (1 = yes, 0 = no)