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VxWorks Fall 2005 Final Project CS 450: Operating Systems Section 1

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.

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VxWorks Fall 2005 Final Project CS 450: Operating Systems Section 1

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  1. VxWorksFall 2005 Final ProjectCS 450: Operating SystemsSection 1 Kenneth White Josh Houck Karl Ridgeway Mike Ripley Morgan Serene

  2. Overview • Environment Used • Real-Time Operating System (RTOS) • Examples of Environments: • Home use Modems • Traffic Control Systems • NASA Pathfinder

  3. 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

  4. 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

  5. 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) Platforms General Purpose Automotive Devices Consumer Devices Network Equipment Industrial Devices Safety Critical ARINC 653 Safety Critical DO-178B

  6. Threads Multi-threaded or Multitasking Preemptive Priority

  7. Mars Pathfinder Bus Management Task (high Priority) Meteorological data-gathering (low priority) Communication task (medium priority)

  8. 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

  9. 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

  10. Processor States Design Considerations of a Real Time OS Fully Customizable: Process Based User Mode Can also run in fully Supervisor Mode Why?

  11. 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

  12. Feature Highlights • Supports up to 20 CPUs • Binary and counting semaphores • Shared memory pools and partitions All geared towards performance

  13. Questions about VxWorks

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