Sean Barker

Recap: Architecture Support for OS

1

OS Service Hardware Support

Protection Kernel/user mode, privileged instructions, base/limit registers

Interrupts Interrupt vectors

System calls Trap instructions and trap vectors

I/O InterruptsScheduling, error recovery,

accounting Timer

Synchronization Atomic instructions

Virtual memory Translation look-aside buffers

Sean Barker

System Calls

2

Sean Barker

Making a System Call

3

user mode

kernel mode

Sean Barker

Example System Calls

4

Sean Barker

System Call Implementation

5

Sean Barker

OS Architecture: Mac OS X

6

Sean Barker

OS Architecture: Windows 8

7

Sean Barker

Monolithic Kernel Design

8

Sean Barker

Layered OS Design

9

User programs

Device drivers

Virtual memory

I/O channel

CPU scheduler

Hardware

Sean Barker

Microkernel Design

10

Sean Barker

Hybrid Design in Mac OS X

11

Sean Barker

Modular Design

12