virtual memory management

virtual memory address

VMA
|virtual page number n bits|virtual page offset mbits|

VPN is used as index to find an entry in the address table which contains the physical page number

………….
…………
…………
physical page number p bits
…………
…………

then PPN is concatencated with VPO to form the entire Physical Address

in fact, N bits in virtual address is transformed into P bits in physical address.

size of address table is : 2^N * (P+1) extra 1 bit indicating whether the page is loaded in memory