Virtual Memory Management and Address Translation Overview
Explore the concepts of virtual memory management, load-time relocation, base and bounds example, x86-64 address translation, and accessing user memory in operating systems. Learn about the interaction between user and operating system memory spaces, stack, data, and code organization.
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Presentation Transcript
Load-Time Relocation Operating System Process 3 Process 6 Process 1 0 CS 111 Lecture Notes: Virtual Memory Slide 1
Base & Bounds Example 2000 1420 SP Process Virtual Address Space RETURN 140 66 CALL 140 62 0 CS 111 Lecture Notes: Virtual Memory Slide 2
x86-64 Address Translation 64-bit Virtual Address 16 9 9 9 9 12 PML1 (Page Table) PML2 (Page Directory) PML3 (Page Directory Pointer Table) 40 12 PML4 Page Frame Offset PML4 Base 52-bit Physical Address CS 111 Lecture Notes: Virtual Memory Slide 3
Accessing User Memory write(fd, buffer, length) Pages User Address Space (Virtual) OS Address Space (Physical) CS 111 Lecture Notes: Virtual Memory Slide 4
OS and User in Same Address Space Operating System Stack Data Code 0 CS 111 Lecture Notes: Virtual Memory Slide 5
