Load-Time Relocation Operating System Process 3 Process 6 - - PowerPoint PPT Presentation

▶

Nov 24, 2022 292 likes •351 views

Load-Time Relocation Operating System Process 3 Process 6 Process 1 0 CS 140 Lecture Notes: Virtual Memory Slide 1 Base & Bounds Example 2000 1420 SP Process Virtual RETURN Address Space 140 66 62 CALL

SLIDE 1

Load-Time Relocation

CS 140 Lecture Notes: Virtual Memory Slide 1

Process 1

∞

Process 3 Operating System Process 6

SLIDE 2

Base & Bounds Example

CS 140 Lecture Notes: Virtual Memory Slide 2

2000 1420 140 62 66 SP RETURN … … CALL 140 …

Process Virtual Address Space

SLIDE 3

x86-64 Address Translation

CS 140 Lecture Notes: Virtual Memory Slide 3

16 9 9 9 9 12 PML4 PML3 (Page Directory Pointer Table) Page Frame Offset PML4 Base

64-bit Virtual Address 52-bit Physical Address 40 12

PML2 (Page Directory) PML1 (Page Table)

SLIDE 4

Accessing User Memory

CS 140 Lecture Notes: Virtual Memory Slide 4

write(fd, buffer, length) Pages User Address Space (Virtual) OS Address Space (Physical)

SLIDE 5

OS and User in Same Address Space

CS 140 Lecture Notes: Virtual Memory Slide 5