Transcript RTEMSonDeos-v2

A Unique Approach to
FACE Conformance
DDC-I / OAR
Software and Systems Engineering
Safety Critical Software Solutions for Mission Critical Systems
Gary Gilliland
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Technical Marketing Manager at DDC-I
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25+ years experience in embedded design,
avionics and RTOS
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Electrical Engineering degree from University of
Texas
DDC-I, Inc.
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Leading provider of mission/safety-critical software
solutions for 30 years.
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Headquarters in Phoenix, AZ
• World-wide presence
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Primary market: Certifiable avionics software
Software and Systems Engineering
Safety Critical Software Solutions for Mission Critical Systems
Joel Sherrill, Ph.D.
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Director of Research and Development for OAR Corporation
RTEMS Project Lead
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30 years experience with real-time operating systems including the
design, development, and fielding of embedded applications in a
variety of commercial, research, and military domains
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BS Computer Science, University of Tennessee at Chattanooga
MS Computer Science, University of Alabama in Huntsville
Ph.D. Computer Science, University of Alabama in Huntsville
OAR Corporation
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Software and systems engineering for mission critical software
solutions for almost 40 years
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Headquarters in Huntsville Alabama
• World-wide customer base
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Primary market: Critical real-time embedded systems
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Original developers and constant maintainers of RTEMS
Software and Systems Engineering
Safety Critical Software Solutions for Mission Critical Systems
DDC-I Core Competencies
• Certifiable, safety-critical RTOS products
• Deos (ARINC-653, RMA, or hybrid)
• First certification in 1998
• Integrated Development Environment (IDE)
• Development, testing & analysis tools
• DO-178/ED-12 certification expertise
• First DO-178 DAL-A (Ada) product released in 1992
• We perform our own certification work
• We defend our certification artifacts during all audits
• We do not reverse engineer certification artifacts
Software and Systems Engineering
Safety Critical Software Solutions for Mission Critical Systems
OAR Core Competencies
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Real-Time Embedded Systems Development
Operating Systems Experts
Advisors, Consulting
Standards Development
Software Architectures & Software Engineering
DEFENSE SYSTEMS - We support the entire lifecycle of
today’s advanced weapon systems. Emphasis in design,
development, testing, and oversight of advanced technical
solutions for today’s and tomorrow military.
• COMMERCIAL SYSTEMS - We provide software
development and systems engineering services ranging
from simple device drivers to complex applications and
systems of systems.
Software and Systems Engineering
Safety Critical Software Solutions for Mission Critical Systems
Deos Highlights
• Pedigree – Unmatched record of deployment, support & certification
• >10,000 aircraft, >10 Million of flight hours, > 40 aircraft types, >100 certs
• Features
• Time, space & resource partitioning with ARINC 653 and/or RMA scheduling
• DAL-A Linker/loader for binary modularity - Enables reuse of software &
certification credits, and minimizes change impacts
• Data Distribution Service (IOI)
• TCP/IP, File system, ARINC 664/AFDX, ARINC-615 TDL, USB
• Performance
• Cache partitioning, low system tick overheads, linier API performance, etc.
• Slack scheduling & time budget transfer
• Multicore option
• Tooling
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Ethernet & FTP based development – with PC-based processor simulator
Compiler independent (i.e., current version)
All tooling applicable through V&V (and deployment in some cases)
Tooling to determine WCE for apps and target
Source/Object code coverage tool provided
Software and Systems Engineering
Safety Critical Software Solutions for Mission Critical Systems
RTEMS Highlights
• RTEMS is an Industrial Grade open source RTOS
• Twenty five year history of deployment on multiple planets,
unique instruments, automotive systems, and highly critical
industrial infrastructure
• High performance with deterministic behavior
• Low overhead with predictable resource consumption
• TCP/IP, network services, multiple file systems, USB,
dynamic loading, SMP, RMA, pluggable schedulers, shell,
and much more
• Supports over a dozen CPU architectures
Software and Systems Engineering
8
Safety Critical Software Solutions for Mission Critical Systems
FACE Conformance Approach
• FACE Safety Base Conformance requires ARINC 653 and
POSIX interfaces
• Leverage strengths of both RTOSs to provide a complete
solution
• Deos provides the ARINC653 interfaces and 18 years of
certification experience
• RTEMS provides the POSIX interfaces and 27 years of
RTOS experience in the space and military domains
• The combination is a unique solution to the FACE OSS
for Safety Base profile
Software and Systems Engineering
Safety Critical Software Solutions for Mission Critical Systems
API Standards Supported by RTEMS
• POSIX 1003.1b a.k.a. Open Group Single Unix
Specification (http://www.opengroup.org)
• Within limits of single process environment
• ANSI C Standard Library
• RTEID/ORKID based Classic API
• C++ support via GCC including OpenMP
• Note that some “standards” imply others
• POSIX 1003.1b references ANSI C Library
• EL/IX references POSIX and BSD
Software and Systems Engineering
11
Safety Critical Software Solutions for Mission Critical Systems
ARINC 653 Conformance
• The Deos653 Runtime library conforms with the API
defined by AVIONICS APPLICATION SOFTWARE
STANDARD INTERFACE PART 1 - REQUIRED SERVICES
ARINC SPECIFICATION 653P1-3. ARINC. November 15,
2010
• The runtime provides ARINC 653 Part 2 – Extended
Services APIs
• File system services
• Sampling Port extension Services
• Memory Blocks
Software and Systems Engineering
Safety Critical Software Solutions for Mission Critical Systems
POSIX API’s Supported
• The RTEMS POSIX Runtime provides most of POSIX APIs
within constraint of a single process
• FACE Safety Base POSIX profile has 246 APIs
• Current deficiencies per Conformance Test Suite
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tzname is supported. CTS does not find it. Still to be investigated
pthread_condattr_[gs]setclock – Not yet supported
pthread_setschedprio - Not yet supported
pthread_[sg]etconcurrency- Not yet supported
mmap – To be provided as part of DEOS+RTEMS integration
shm_open - To be provided as part of DEOS+RTEMS integration
posix_devctl – Not yet supported
Networking methods – Could be provided by either DDC-I LWIP or
RTEMS FreeBSD TCP/IP stack
Software and Systems Engineering
Safety Critical Software Solutions for Mission Critical Systems
FACE Architecture
FACE Boundary
Operating
System
Segment
Portable Components Segment
TS
OS
ARINC-653
Runtime
Transport Services
Segment
OS
Platform-Specific Services Segment
POSIX
Runtime
OS
TS
IO
I/O Services Segment
TM
OS
Certifiable
Real-time
Operating
System
Health
Monitoring
Software and Systems Engineering
Device Driver
Device Driver
KEY
FACE Defined Interface
Safety Critical Software Solutions for Mission Critical Systems
System Architecture
RTEMS POSIX Partition
Deos 653 Partition
Deos RMA Process
POSIX User Executable
ARINC 653 User
Executable
Deos RMA User Executable
RTEMS POSIX
Thread Scheduler & POSIX
API Library
ARINC653 Process
Scheduler & 653 P1 API
Library
TCP/IP (LWIP)
RTEMS/Deos Adapter
IOI Lib
IOI Lib
Deos API Library
Shared
Memory
Shared
Memory
User Mode
Kernel Mode
Deos Kernel
PAL
Deos Registry with WAT
Target System Hardware and CPU
Software and Systems Engineering
Safety Critical Software Solutions for Mission Critical Systems
ARINC 653 and POSIX Scheduling
Major Frame
PA1
Partition
A
Partition
B
Partition
C
Partition
A
Partition
C
Partition
D
ARINC
653
ARINC
653
RTEMS POSIX
ARINC
653
RTEMS POSIX
RMA
Threads
PA2
PA3
PB1
PB2
TC1
TC2
TC3
PA1
PA2
T
TC1
C1
T
TC2
C2
PD1
TCP
/IP
PD2
• ARINC 653 Processes scheduled ARINC 653 partitions.
• POSIX threads scheduled by RTEMS in POSIX partitions.
• Deos kernel schedules partitions
Scheduling of 653 processes or POSIX threads
Scheduling of RMA threads
Scheduling of POSIX threads
Software and Systems Engineering
Safety Critical Software Solutions for Mission Critical Systems
Summary
• FACE Conformance requires ARINC 653 and
POSIX interfaces
• Deos has certified ARINC 653 support
• RTEMS has robust POSIX support
• Both have many years of successful fielded
applications
• Combining Deos and RTEMS leverages the
strengths of both to provide a FACE Safety
Base OSS solution
Software and Systems Engineering
Safety Critical Software Solutions for Mission Critical Systems
Thanks!
Contact Information
Gary Gilliland
[email protected]
Joel Sherrill
[email protected]
www.ddci.com
www.oarcorp.com/rtems
Software and Systems Engineering
Safety Critical Software Solutions for Mission Critical Systems