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ABB semaphore protection overhaul The ABB semaphone protection logic that came with TCS211 from TI was broken in several ways: * Some semaphore-protected functions were called from Application_Initialize() context. NU_Obtain_Semaphore() called with NU_SUSPEND fails with NU_INVALID_SUSPEND in this context, but the return value wasn't checked, and NU_Release_Semaphore() would be called unconditionally at the end. The latter call would increment the semaphore count past 1, making the semaphore no longer binary and thus no longer effective for resource protection. The fix is to check the return value from NU_Obtain_Semaphore() and skip the NU_Release_Semaphore() call if the semaphore wasn't properly obtained. * Some SPI hardware manipulation was being done before entering the semaphore- protected critical section. The fix is to reorder the code: first obtain the semaphore, then do everything else. * In the corner case of L1/DSP recovery, l1_abb_power_on() would call some non-semaphore-protected ABB & SPI init functions. The fix is to skip those calls in the case of recovery. * A few additional corner cases existed, all of which are fixed by making ABB semaphore protection 100% consistent for all ABB functions and code paths. There is still one remaining problem of priority inversion: suppose a low- priority task calls an ABB function, and some medium-priority task just happens to preempt right in the middle of that semaphore-protected ABB operation. Then the high-priority SPI task is locked out for a non-deterministic time until that medium-priority task finishes its work and goes back to sleep. This priority inversion problem remains outstanding for now.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Apr 2021 20:55:25 +0000
parents 4e78acac3d88
children
line wrap: on
line source

#!/bin/sh

help ()
{
  echo "Usage: $0 { -help|-gmake|-l <LABEL>|-clean|-exp|-unco}"
  exit 0
}

error ()
{
  grep "error " $err_file
  echo "Errors occurred! See $err_file for details."
  exit 1
}

if [ "$WINWORD" != "" ] ; then
# Windows environment
  OSENV=windows
  if [ "$CLEARCASE_PRIMARY_GROUP" == "" ] ; then
    HAVE_CC=0
  else
    cleartool lsview -cview >nul 2>&1
    if [ $? == 0 ] ; then
      HAVE_CC=1
    else
      HAVE_CC=0
    fi
  fi
else
  OSENV=`uname`
  cleartool lsview -cview >/dev/null 2>&1
  if [ $? == 0 ] ; then
    HAVE_CC=1
  else
    HAVE_CC=0
  fi
fi

if [ $HAVE_CC == 1 ] ; then
  M="clearmake -V -C gnu"
else
  if [ $OSENV == windows ] ; then
    M="gnumake -r"
  else
    M="make -r"
  fi
fi

name=CCD
name_small=ccd
err_file=../$name_small.err
ver=0
maketarget="colibs all"

if [ "$1" != "" ] ; then 

  case "$1" in
    -clean)
       maketarget=clean
       ;;
    -gmake)
       if [ $OSENV == windows ] ; then
         M="gnumake -r"
       else
         M="make -r"
       fi
       ;;
    -test)
       echo testing not yet implemented
       exit 0
       ;;
    -exp)
       maketarget="colibs all cilibs"
       ;;
    -l)
       echo labelling not yet implemented
       exit 0
       ;;
    -help)
       help
       ;;
    *) 
       echo Unknown option "$1"
       help
       ;;
  esac

fi

rm -f $err_file

if [ "$maketarget" == clean ] ; then
  echo "*** cleaning $name ***" | tee -a $err_file
elif [ "$maketarget" == "colibs all cilibs" ] ; then
  echo "*** making and checking in $name ***" | tee -a $err_file
else
  echo "*** making $name ***" | tee -a $err_file
fi

case "$OSENV" in
  windows)
	   echo "Use mall.bat to build under windows environments." >> $err_file
		 error
     ;;

  Linux)
     echo $M $maketarget TARGET=linuxpc DEBUG=0 TRACE=0 MEMSUPER=0 >> $err_file
     $M $maketarget TARGET=linuxpc DEBUG=0 TRACE=0 MEMSUPER=0 >> $err_file 2>&1
     if [ $? != 0 ] ; then error ; fi
     echo $M $maketarget TARGET=linuxpc DEBUG=1 TRACE=0 MEMSUPER=0 >> $err_file
     $M $maketarget TARGET=linuxpc DEBUG=1 TRACE=0 MEMSUPER=0 >> $err_file 2>&1
     if [ $? != 0 ] ; then error ; fi
     echo $M $maketarget TARGET=linuxpc DEBUG=1 TRACE=1 MEMSUPER=0 >> $err_file
     $M $maketarget TARGET=linuxpc DEBUG=1 TRACE=1 MEMSUPER=0 >> $err_file 2>&1
     if [ $? != 0 ] ; then error ; fi
     echo $M $maketarget TARGET=linuxarm DEBUG=0 TRACE=0 MEMSUPER=0 >> $err_file
     $M $maketarget TARGET=linuxarm DEBUG=0 TRACE=0 MEMSUPER=0 >> $err_file 2>&1
     if [ $? != 0 ] ; then error ; fi
     echo $M $maketarget TARGET=linuxarm DEBUG=1 TRACE=0 MEMSUPER=0 >> $err_file
     $M $maketarget TARGET=linuxarm DEBUG=1 TRACE=0 MEMSUPER=0 >> $err_file 2>&1
     if [ $? != 0 ] ; then error ; fi
     echo $M $maketarget TARGET=linuxarm DEBUG=1 TRACE=1 MEMSUPER=0 >> $err_file
     $M $maketarget TARGET=linuxarm DEBUG=1 TRACE=1 MEMSUPER=0 >> $err_file 2>&1
     if [ $? != 0 ] ; then error ; fi
     ;;
  Solaris)
     echo $M $maketarget TARGET=solsparc DEBUG=0 TRACE=0 MEMSUPER=0 >> $err_file
     $M $maketarget TARGET=solsparc DEBUG=0 TRACE=0 MEMSUPER=0 >> $err_file 2>&1
     if [ $? != 0 ] ; then error ; fi
     echo $M $maketarget TARGET=solsparc DEBUG=1 TRACE=0 MEMSUPER=0 >> $err_file
     $M $maketarget TARGET=solsparc DEBUG=1 TRACE=0 MEMSUPER=0 >> $err_file 2>&1
     if [ $? != 0 ] ; then error ; fi
     echo $M $maketarget TARGET=solsparc DEBUG=1 TRACE=1 MEMSUPER=0 >> $err_file
     $M $maketarget TARGET=solsparc DEBUG=1 TRACE=1 MEMSUPER=0 >> $err_file 2>&1
     if [ $? != 0 ] ; then error ; fi
     ;;
esac

exit 0