Recap: Architecture Support in OS - Bowdoin Collegesbarker/teaching/courses/os/14fall/lectur… ·...
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Sean Barker Recap: Architecture Support in OS 1 OS Service Hardware Support Protection Kernel/user mode, protected instructions, base/limit registers Interrupts Interrupt vectors System calls Trap instructions and trap vectors I/O Interrupts Scheduling, error recovery, accounting Timer Synchronization Atomic instructions Virtual memory Translation look-aside buffers Sean Barker Today: OS Services and Structure ! System call implementation ! Organization and components of an OS 2
Transcript of Recap: Architecture Support in OS - Bowdoin Collegesbarker/teaching/courses/os/14fall/lectur… ·...
Sean Barker
Recap: Architecture Support in OS
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OS Service Hardware Support
Protection Kernel/user mode, protected 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
Today: OS Services and Structure
! System call implementation
! Organization and components of an OS
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Sean Barker
System Calls
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Sean Barker
Making a System Call
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user mode
kernel mode
Sean Barker
Example System Calls
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Sean Barker
System Call Implementation
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Sean Barker
OS Architecture: Mac OS X
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Sean Barker
OS Architecture: Windows 8
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Sean Barker
Monolithic Kernel Design
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Sean Barker
Layered OS Design
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User programs
Device drivers
Virtual memory
I/O channel
CPU scheduler
Hardware
Sean Barker
Microkernel Design
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Sean Barker
Mac OS X - hybrid approach
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Sean Barker
Modules
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Sean Barker
Summary
! System calls as interface to the OS
! OS design approaches• Monolithic• Layered• Microkernels• Modules
! Tradeoffs: simplicity vs. performance
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