Virtual Memory

Introduction Virtual memory technique Logical address Vs physical address Address translation

Contd… Processor Virtual Adress Data MMU Physical address Cache Main Memory Disk MMU Data Virtual Adress Physical address DMA transfer

Address Translation PTBR Page Table address Virtual Page no. Offset + Page frame Control bits Page frame in mem

Look Up Virtual Page no. Offset Page frame =? Yes Hit No Miss VPN Control bits PF

Memory Management Requirements System Space Vs User Space Protection Sharing

Queries?

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