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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 08ecd0bd517d
children
line wrap: on
line source

#!/bin/sh

if [ $# -lt 1 -o $# -gt 2 ]
then
	echo "usage: $0 component-lib [flavor]" 1>&2
	exit 1
fi

LIBNAME="$1"

if [ -n "$2" ]
then
	recipe_file="components/$1-$2"
else
	recipe_file="components/$1"
fi

if [ ! -f "$recipe_file" ]
then
	echo "Error: $recipe_file not found" 1>&2
	exit 1
fi

if [ -z "$BUILD_DIR" ]
then
	echo "Error: BUILD_DIR= must be passed via environment" 1>&2
	exit 1
fi

set -e

mkdir -p $BUILD_DIR/$LIBNAME

# beginning of the Makefile
echo "all:	$LIBNAME.lib" > $BUILD_DIR/$LIBNAME/Makefile
echo >> $BUILD_DIR/$LIBNAME/Makefile

# shell functions to be used in the recipes

make_version() {
	case $# in
	    1)
		echo "$1_version.c:" >> $BUILD_DIR/$LIBNAME/Makefile
		echo "	../../scripts/make-version.sh $1 > $1_version.c" \
			>> $BUILD_DIR/$LIBNAME/Makefile
		;;
	    2)
		echo "$2_version.c:" >> $BUILD_DIR/$LIBNAME/Makefile
		echo "	../../scripts/make-version.sh $1 > $2_version.c" \
			>> $BUILD_DIR/$LIBNAME/Makefile
		;;
	    *)
		echo "Error: make_version takes 1 or 2 arguments" 1>&2
		exit 1
		;;
	esac
	echo >> $BUILD_DIR/$LIBNAME/Makefile
}

asm_file() {
	if [ $# != 1 ]
	then
		echo "Error: asm_file takes 1 argument" 1>&2
		exit 1
	fi
	objname=`basename "$1" .s`.obj
	helpers/makeline dep $objname "$1" >> $BUILD_DIR/$LIBNAME/Makefile
	helpers/makeline cmd ../../toolwrap/asm470 ${ASMFLAGS} "$1" '$@' \
		>> $BUILD_DIR/$LIBNAME/Makefile
	echo >> $BUILD_DIR/$LIBNAME/Makefile
	OBJS="$OBJS $objname"
}

cfile_plain() {
	if [ $# != 1 ]
	then
		echo "Error: cfile_plain takes 1 argument" 1>&2
		exit 1
	fi
	objname=`basename "$1" .c`.obj
	helpers/makeline dep $objname "$1" >> $BUILD_DIR/$LIBNAME/Makefile
	case "$objname" in
		*[A-Z]*)
			helpers/makeline cmd rm -f '$@' \
				>> $BUILD_DIR/$LIBNAME/Makefile
			;;
	esac
	helpers/makeline cmd ../../toolwrap/cl470 -q -c ${CFLAGS} ${CPPFLAGS} \
		"$1" >> $BUILD_DIR/$LIBNAME/Makefile
	case "$objname" in
		*[A-Z]*)
			objname_lc=`echo $objname | tr A-Z a-z`
			helpers/makeline cmd mv $objname_lc $objname \
				>> $BUILD_DIR/$LIBNAME/Makefile
			;;
	esac
	echo >> $BUILD_DIR/$LIBNAME/Makefile
	OBJS="$OBJS $objname"
}

cfile_str2ind() {
	if [ $# != 1 ]
	then
		echo "Error: cfile_str2ind takes 1 argument" 1>&2
		exit 1
	fi
	if [ "$USE_STR2IND" = 1 ]
	then
		objname=`basename "$1" .c`.obj
		pp_name=`echo $1 | sed -e 's/\.c$/.pp/' | tr A-Z a-z`
		pp__name=`echo $1 | sed -e 's/\.c$/.pp_/' | tr A-Z a-z`
		helpers/makeline dep $objname "$1" \
			>> $BUILD_DIR/$LIBNAME/Makefile
		case "$objname" in
			*[A-Z]*)
				helpers/makeline cmd rm -f '$@' \
					>> $BUILD_DIR/$LIBNAME/Makefile
				;;
		esac
		helpers/makeline cmd ../../toolwrap/cl470 -q -po -p? -x \
			${CPPFLAGS} "$1" >> $BUILD_DIR/$LIBNAME/Makefile
		helpers/makeline cmd ../../toolwrap/str2ind -a \
			-t ../str2ind.tab -l ../str2ind.log \
			-f "$pp_name" >> $BUILD_DIR/$LIBNAME/Makefile
		helpers/makeline cmd ../../toolwrap/cl470 -q -c ${CFLAGS} \
			"$pp__name" >> $BUILD_DIR/$LIBNAME/Makefile
		helpers/makeline cmd @rm -f "$pp_name" \
			>> $BUILD_DIR/$LIBNAME/Makefile
		helpers/makeline cmd @rm -f "$pp__name" \
			>> $BUILD_DIR/$LIBNAME/Makefile
		case "$objname" in
			*[A-Z]*)
				objname_lc=`echo $objname | tr A-Z a-z`
				helpers/makeline cmd mv $objname_lc $objname \
					>> $BUILD_DIR/$LIBNAME/Makefile
				;;
		esac
		echo >> $BUILD_DIR/$LIBNAME/Makefile
		OBJS="$OBJS $objname"
	else
		cfile_plain "$1"
	fi
}

cfile_symlink() {
	if [ $# != 1 ]
	then
		echo "Error: cfile_symlink takes 1 argument" 1>&2
		exit 1
	fi
	localcopy=`basename "$1"`
	echo "$localcopy:" >> $BUILD_DIR/$LIBNAME/Makefile
	echo "	ln -s $1 ." >> $BUILD_DIR/$LIBNAME/Makefile
	echo >> $BUILD_DIR/$LIBNAME/Makefile
	cfile_plain $localcopy
}

# invoke the recipe

SRC=../../src
OBJS=
. "$recipe_file"

# finish the Makefile

helpers/makeline dep $LIBNAME.lib ${OBJS} >> $BUILD_DIR/$LIBNAME/Makefile
echo '	../../toolwrap/ar470 r $@ $^' >> $BUILD_DIR/$LIBNAME/Makefile
echo >> $BUILD_DIR/$LIBNAME/Makefile
echo 'clean:' >> $BUILD_DIR/$LIBNAME/Makefile
echo '	rm -f *.obj *.lib *.c' >> $BUILD_DIR/$LIBNAME/Makefile