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Three Architectural Parameters
Virtual Address Size
Example: 32-bit Virtual Address, 30-bit Physical Address, 4-KB Page Size
Page Map Entry
Page Map Pointer
Page Table Caches
Final Example
How many pages does the page table occupy?
What is the physical address for virtual address hex 1804?
Example: TLB and Page Map Contents
Virtual Address Space of a Process: In virtual memory processes are represented by its virtual address space. It is contiguous addressable space (from address 0 to MAX_SIZE).a.out contains information about how to create the virtual address space.
Addressing the process (Memory Management Unit): To access process memory, the processor generates the corresponding virtual address. Memory Management Unit maps the virtual address V to a corresponding physical address P in RAM.
MMU Mapping: When a program begins to execute, the OS creates a page table in RAM. Virtual address comprises of two parts.
MMU mapping in 32 bit systems
Two Level Page Translation
Working of Virtual Memory: Working of Virtual Memory has been explained with example.
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