Transcript VxWorks-by-Morgan-Serene-Karl-Ridgeway-Ken-White-Josh

VxWorks
Fall 2005 Final Project
CS 450: Operating Systems
Section 1
Kenneth White
Josh Houck
Karl Ridgeway
Mike Ripley
Morgan Serene
Overview
• Environment Used
– Real-Time Operating System (RTOS)
– Examples of Environments:
• Home use Modems
• Traffic Control Systems
• NASA Pathfinder
Overview (2)
• Commercial Success
– 6 incrementally improved Releases
– 350 billion devices
• Most Widely used RTOS available today
• Cost of Programming
– Normally, $50.00 to $1,000.00 per line of code
for Government Certification
– $3.00 per line of code for Migration of a new
OS
3 Configurations
Configuration #1 – Self Contained (closed, validated systems)
-Real-time process partitioning, protecting applications from each other, and
protecting the kernel from applications.
-Error management
-Test and diagnostics to allow dynamic debugging and post-deployment
modifications
-Wind River Workbench (integrated, Eclipse-based development suite) for code
compiling, analysis, editing, and debugging
Configuration #2 – Network
-Validated solutions to secure resource availability
-IPsec and IKE
-SNMP
-Wireless LAN driver and security protocols
-Firewall
3 Configurations
Configuration #3 – Safety Critical
-Suitable for the highest levels of safety and security requirements,
as mandated by law
-Platform for Safety Critical ARINC 653
-Platform for Safety Critical DO-178B
-XML Configuration Tool Suite for IMA implementations
-Support for Common Criteria requirements
-POSIX Real-Time Profile PSE52 and PSE54 (conformance by spring
2006)
General Purpose
Consumer Devices
Industrial Devices
Safety Critical DO-178B
Platforms
Automotive Devices
Network Equipment
Safety Critical ARINC 653
Threads
Multi-threaded or Multitasking
Preemptive
Priority
Mars Pathfinder
Bus Management Task (high Priority)
Meteorological data-gathering (low priority)
Communication task (medium priority)
VxWorks Disk Usage
• VxWorks has libraries available for FAT
(DOS) and HPFS (Mac)
• If permanent storage is required, VxWorks
can use flash memory
• VxWorks can be loaded from flash at boot,
then run from RAM
FAT Library Details
• Two main configuration parameters
– Maximum RAM usage
– Block calling application until RAM allocation
succeeds
• File allocation table is rebuilt on boot
• Deleted files are only marked as deleted,
not actually erased
• Deleted files are added to the file table on
reboot to keep the table accurate
Processor States
Design Considerations of a Real
Time OS
Fully Customizable:
•Process Based User Mode
•Can also run in fully Supervisor
Mode
Why?
A Multiprocessor OS
• Used to be uniprocessor, but have since
added support for Symmetric
multiprocessing facilities (VxMP)
• Supported targets
– Motorola 68K/CPU32, PowerPC, MIPS, Intel
Architecture
Feature Highlights
• Supports up to 20 CPUs
• Binary and counting semaphores
• Shared memory pools and partitions
All geared towards performance
Questions about VxWorks