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Operating System Abstraction Layer Project

OSAL Logo by Michael Cudmore

The OS Abstraction Layer was originally devloped by the Flight Software Systems Branch at NASA Goddard Space Flight Center.

OS Abstraction Layer information:

This distribution contains:

  1. The OS Abstraction Layer Library
  2. Tests and example applications
  3. for the following targets:
    • Generic PPC running vxWorks 6.x ( Tested on vxWorks 6.4 )
    • Axiom m5235BCC Coldfire Evaluation board running the RTEMS 4.10 Operating System
    • A PC running Linux ( Tested on CentOS 5.x and 6.x 32 bit )
    • The sparc/sis simulator running RTEMS 4.10.2
  4. A directory structure and makefiles to manage it all.

Getting Started:

See the document doc/OSAL-Configuration-Guide.doc for complete details.

An easy way to get started is to use the Linux port:

  1. Set the OSAL_SRC environment variable to point to the OSAL source code.
    • Running setvars.sh will set the variable for you ($source ./setvars.sh)
  2. Edit the build/osal-config.mak file and set the following options:
    • BSP - Set this to the board you are running on. For a PC running linux, use pc-linux
    • OS - Set this to the OS you are running. For a PC running linux, use posix.

Buiding on a PC running linux:

export OSAL_SRC = /home/acudmore/osal/src

In build/osal-config.mak:

OS=posix
BSP=pc-linux

Now just type make from the build directory and it should build the OSAL core files, tests, and sample applications for you. The binary for each application is in its own directory (i.e. build/examples/tasking-example/tasking-example.bin) You can switch to that directory and run it. You can also debug it using GDB.

NOTE: Running on linux may require root or adjusting the posix message queue maximum sizes.

The Embedded targets take a little more work to run, because they must be cross compiled and booted on the board. By copying a target, you should be able to come up with a new target.

If you would like just the OSAL itself, just look in src/os/inc for the include files and src/os/ for the OSAL implementation.

The API documentation is in the doc directory.

Contact Information:

Alan Cudmore
NASA Goddard Space Flight Center
Code 582.0
Greenbelt, MD 20771
[email protected]

Copyright notice:

Copyright United States Government as represented by the Administrator of the National Aeronautics and Space Administration

License information:

This software is licensed under NASAs Open Source Agreement. The release of the software is conditional upon the recipients acceptance of the Open Source Agreement. Please see the file: NASA_Open_Source_Agreement_1_3-OS_AbstractionLayer.txt