Sean Barker

OS Organization

1

kernel

Sean Barker

User and Kernel Mode

2

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System Calls

3

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Making a System Call

4

user mode

kernel mode

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Example System Calls

5

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System Call Implementation

6

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Traps

7

0: 0x00080000

1: 0x00100000

2: 0x00100480

3: 0x00123010

Illegal address

Memory violation

Division by zero

System call

Trap Vector

...

Memory Addresses

Sean Barker

Interrupts & I/O Control

8

0: 0x2ff080000

1: 0x2ff100000

2: 0x2ff100480

3: 0x2ff123010

keyboard

mouse

timer

disk 1

Interrupt Vector

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Hardware Timer

9

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OS Architecture: Mac OS X

10

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OS Architecture: Windows 8

11

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Monolithic Kernel Design

12

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Layered OS Design

13

User programs

Device drivers

Virtual memory

I/O channel

CPU scheduler

Hardware

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Microkernel Design

14

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Hybrid Design in Mac OS X

15

Sean Barker

Modular Kernel Design

16