CS 140 Lecture Notes: Virtual Memory

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Presentation transcript:

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

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

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

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 Code Data Stack Operating System ∞ CS 140 Lecture Notes: Virtual Memory

CS 140 Lecture Notes: Virtual Memory

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