CS 140 Lecture Notes: Virtual Memory

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Presentation transcript:

CS 140 Lecture Notes: Virtual Memory Load-Time Relocation ∞ Operating System Process 3 Process 6 Process 1 CS 140 Lecture Notes: Virtual Memory

CS 140 Lecture Notes: Virtual Memory Base & Bounds Example Virtual Address Space 2000 1420 SP RETURN 140 ... 66 ... 62 CALL 140 CS 140 Lecture Notes: Virtual Memory

x86-64 Address Translation 64-bit Virtual Address 16 9 9 9 9 12 not used Page Table Page Directory (PML2) Page Directory Pointer Table (PML3) 40 12 PML4 Table Page Frame Offset 52-bit Physical Address PML4 Base CS 140 Lecture Notes: Virtual Memory

Accessing User Memory write(fd, buffer, length) Pages User Address Space (Virtual) OS Address Space (Physical) CS 140 Lecture Notes: Virtual Memory

OS and User in Same Address Space ∞ Operating System Stack Data Code CS 140 Lecture Notes: Virtual Memory

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