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#! /bin/sh
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#
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# Prex configure script
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#
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# Required host commands: echo, pwd, expr, uname, tr, cat, cp
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#
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usage()
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{
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	if [ -n "$*" ]; then
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		echo "configure: $*"
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	fi
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	echo
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	echo "Usage: configure [options]"
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	echo "Options:"
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	echo "	--help			print this message"
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	echo "	--target=TARGET		use TARGET for target system"
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	echo "	--profile=PROFILE	use PROFILE for target profile"
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	echo "	--cross-prefix=PREFIX	use PREFIX for compile tools"
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	echo "	--cc=CC			use CC as C compiler"
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	echo "	--no-debug		disable all debug features"
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	exit 1
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}
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quit()
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{
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	echo "Error: $1"
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	exit 1
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}
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setdefaults()
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{
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	target=""
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	profile=""
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	prefix=""
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	srcdir=`pwd`
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	# Use GNU tools as default toolchain
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	cc="gcc"
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	cpp="cpp"
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	as="as"
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	ld="ld"
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	ar="ar"
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	objcopy="objcopy"
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	objdump="objdump"
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	strip="strip"
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}
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checkpath()
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{
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	# Input files
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	CONFIG_IN=$srcdir/conf/$arch/$platform$profile
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	SECURITY_IN=$srcdir/conf/etc/security
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	# Output files
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	CONFIG_MK=$srcdir/conf/config.mk
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	CONFIG_H=$srcdir/conf/config.h
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	CONFIG_LD=$srcdir/conf/config.ld
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	DRVTAB_H=$srcdir/conf/drvtab.h
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	DRVTAB_TMP=$srcdir/conf/drvtab.tmp
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	CAPTAB_H=$srcdir/conf/captab.h
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	if [ ! -f $CONFIG_IN ]; then
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		quit "Can not find $CONFIG_IN for '$target' target"
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	fi
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}
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parseargs()
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{
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	while [ -n "$1" ]; do
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		case $1 in
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		--*=*)
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			option=`expr "x$1" : 'x\([^=]*\)='`
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			optarg=`expr "x$1" : 'x[^=]*=\(.*\)'`
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			;;
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		--*)
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			option=$1
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			;;
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		*)
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			usage "unrecognized option $1"
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			;;
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		esac
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		case $option in
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		--help)
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			usage
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			;;
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		--target)
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			target=$optarg
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			;;
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		--profile)
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			profile="-$optarg"
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			;;
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		--cross-prefix)
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			prefix=$optarg
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			;;
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		--cc)
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			cc=$optarg
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			;;
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		--no-debug)
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			nodebug=1
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			;;
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		*)
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			usage "Unrecognized option $1"
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			;;
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		esac
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		shift
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	done
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}
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gettarget()
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{
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	if [ -z "$target" ]; then
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		echo "Warning: '--target' option was not specified"
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		echo "The target system was set to 'x86-pc'"
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		target="x86-pc"
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	fi
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	arch=`expr "x$target" : 'x\([^=]*\)-'`
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	platform=`expr "x$target" : 'x[^=]*-\(.*\)'`
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	case "$arch" in
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	x86|arm|ppc|sh|mips)
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		;;
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	*)
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		quit "Unkown target architecture: $arch"
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		;;
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	esac
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}
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gethost()
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{
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	# 'uname' command may be unavailable under Windows.
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	# So, we check MACHTYPE variable for cygwin/mingw at first.
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	case "$MACHTYPE" in
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	*-cygwin)
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		hostname="CYGWIN"
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		;;
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	*-msys)
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		hostname="MINGW"
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		;;
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	*)
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		hostname=`uname -s`
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		;;
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	esac
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}
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# Set the gcc option only when it's supported.
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setgccoption()
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{
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	echo "checking $1"
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	if ${prefix}${cc} $1 -S -xc /dev/null -o /dev/null > /dev/null 2>&1; then
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		echo "GCCFLAGS+= $1" >> $CONFIG_MK
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	fi
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}
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checktools()
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{
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	#
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	# Check compiler version
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	#
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	case "$cc" in
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	*gcc*)
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		setgccoption "-fno-stack-protector"
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		;;
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	esac
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}
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settools()
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{
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	#
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	# Set host specific tool settings
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	#
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	case "$hostname" in
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	*BSD)
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		;;
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	SunOS)
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		# Solaris
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		as="gas"
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		ld="gld"
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		ar="gar"
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		strip="gstrip"
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		objcopy="gobjcopy"
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		objdump="gobjdump"
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		;;
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	CYGWIN*|MINGW*)
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		case "$arch" in
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		x86)
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			prefix="i386-elf-"
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			;;
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		ppc)
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			prefix="powerpc-elf-"
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			;;
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		*)
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			prefix="$arch-elf-"
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			;;
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		esac
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		;;
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	esac
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	#
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	# Set tools
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	#
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	case "$cc" in
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	*gcc*)
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		cc_type="_GNUC_"
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		;;
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	pcc)
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		cc_type="_PCC_"
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		;;
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	suncc)
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		cc_type="_SUNPRO_C_"
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		cc="suncc"
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		;;
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	*)
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		quit "Unkown compiler: $cc"
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		;;
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	esac
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}
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options()
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{
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	param=`expr "x$1" : 'x\([^= ]*\)'`
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	value=`expr "x$1" : 'x[^=]*=\([A-Za-z0-9\.]*\)'`
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	if [ "x$value" = x ] ; then
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		echo "CONFIG_${param}=y"
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		echo "CONFIG_${param}=y" >> $CONFIG_MK
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		echo "#define CONFIG_${param} y" >> $CONFIG_H
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	else
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		echo "CONFIG_${param}=${value}"
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		echo "CONFIG_${param}=${value}" >> $CONFIG_MK
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		echo "#define CONFIG_${param} ${value}" >> $CONFIG_H
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	fi
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}
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device()
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{
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	param=`echo $1 | tr '[a-z]' '[A-Z]'`
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	echo "CONFIG_${param}=y"
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	echo "CONFIG_${param}=y" >> $CONFIG_MK
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	echo "#define CONFIG_${param} y" >> $CONFIG_H
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	echo "extern struct driver $1_driver;" >> $DRVTAB_H
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	echo "	&$1_driver," >> $DRVTAB_TMP
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}
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capability()
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{
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	{
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		echo "{"
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		echo "	\"$1\","
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		shift 1
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		while [ "$1" != "" ] ; do
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			if [ "$2" != "" ] ; then
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				echo "	$1 |"
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			else
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				echo "	$1"
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			fi
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			shift 1
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		done
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		echo "},"
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	} >> $CAPTAB_H
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}
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memory()
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{
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	echo "CONFIG_$1=$2"
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	echo "CONFIG_$1=$2" >> $CONFIG_MK
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	echo "CONFIG_$1 = $2 ;" >> $CONFIG_LD
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	echo "#define CONFIG_$1 $2" >> $CONFIG_H
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}
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command()
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{
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	param=`echo $1 | tr '[a-z]' '[A-Z]'`
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	echo "CONFIG_CMD_${param}=y"
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	echo "CONFIG_CMD_${param}=y" >> $CONFIG_MK
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	echo "#define CONFIG_CMD_${param} y" >> $CONFIG_H
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}
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parseconfig()
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{
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	while read line; do
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		read cmd rest <<-END_OF_COMMAND
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			$line
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		END_OF_COMMAND
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		case "$cmd" in
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		options)
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			options $rest
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			;;
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		device)
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			device $rest
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			;;
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		capability)
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			capability $rest
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			;;
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		makeoptions)
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			echo "$rest"
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			echo "$rest" >> $CONFIG_MK
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			;;
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		memory)
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			memory $rest
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			;;
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		command)
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			command $rest
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			;;
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		esac
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	done < $1
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}
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main()
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{
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	[ -d conf ] ||
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		quit "configure must be run from the top source level"
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	#
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	# Process input arguments
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	#
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	setdefaults
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	parseargs "$@"
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	gettarget
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	checkpath
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	gethost
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	settools
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	echo "#" > $CONFIG_MK
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	echo "# Automatically generated file. Don't edit" >> $CONFIG_MK
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	echo "#" >> $CONFIG_MK
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	echo "_CONFIG_MK_=1" >> $CONFIG_MK
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	echo "/*" > $CONFIG_H
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	echo " * Automatically generated file. Don't edit" >> $CONFIG_H
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	echo " */" >> $CONFIG_H
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	cp $CONFIG_H $CONFIG_LD
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	cp $CONFIG_H $DRVTAB_H
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	cp $CONFIG_H $CAPTAB_H
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	echo "" > $DRVTAB_TMP
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	echo "struct driver *driver_table[] = {" >> $DRVTAB_TMP
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	echo "" >> $CAPTAB_H
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	echo "const struct cap_map cap_table[] = {" >> $CAPTAB_H
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	#
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	# Setup build settings
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	#
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	{
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		echo "ARCH=${arch}"
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		echo "PLATFORM=${platform}"
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		echo "PROFILE=${platform}${profile}"
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		if [ -n "${nodebug}" ]; then
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			echo "NDEBUG=1"
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		fi
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		echo "${cc_type}=1"
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		echo "CC=${prefix}${cc}"
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		echo "CPP=${prefix}${cpp}"
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		echo "AS=${prefix}${as}"
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		echo "LD=${prefix}${ld}"
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		echo "AR=${prefix}${ar}"
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		echo "OBJCOPY=${prefix}${objcopy}"
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		echo "OBJDUMP=${prefix}${objdump}"
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		echo "STRIP=${prefix}${strip}"
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	} >> $CONFIG_MK
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	#
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	# Adjust tool options
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	#
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	checktools
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	#
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	# Generate configuration parameters
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	#
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	echo "checking configuration files..."
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	echo "#define CONFIG_MACHINE ${target}" >> $CONFIG_H
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	echo "#define CONFIG_PROFILE ${profile}" >> $CONFIG_H
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	parseconfig $CONFIG_IN
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	parseconfig $SECURITY_IN
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	cat $DRVTAB_TMP >> $DRVTAB_H
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	echo "};" >> $DRVTAB_H
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	rm -f $DRVTAB_TMP
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	echo "{	NULL, 0 }" >> $CAPTAB_H
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	echo "};" >> $CAPTAB_H
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	echo
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	echo "Prex is now hopefully configured for your setup."
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	echo "Now you must run a make."
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}
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main "$@"