# /usr/etc/rc - continued system initialization.

RANDOM_FILE=/usr/adm/random.dat
TCPISN_FILE=/usr/adm/tcpisn.dat
LOCAL_FILE=/usr/etc/rc.local

ARCH="`sysenv arch`"

if [ ! "$ARCH" ]
then    # Older kernels do not provide an arch sysenv variable.
        # We assume we are on x86 then, as existing systems with
        # kernel and userland (i.e. this script) unsynchronized
        # will be x86.
        ARCH=i386
fi

# Get $SERVICES_DIRS
. /etc/rc.conf

# Directories to find services in
if [ ! "$SERVICES_DIRS" ]
then	SERVICES_DIRS=/service
fi

# Booting from cd?
bootcd="`/bin/sysenv bootcd`"

case "$#:$1" in
1:start|1:stop)
    action=$1
    ;;
*)  echo >&2 "Usage: $0 [start|stop]"
    exit 1
esac

if [ -f "$LOCAL_FILE" ]
then	. "$LOCAL_FILE" $1
fi

disabled()
{
    ifs="$IFS"; IFS=,
    for skip in `sysenv disable`
    do 
        if [ "$skip" = "$1" ]
	then 	 
                IFS="$ifs"; unset ifs
		return 0
	fi
    done
    IFS="$ifs"; unset ifs
    return 1
}

daemonize()
{
    # Function to start a daemon, if it exists.
    local IFS=':'
    local name="$1"

    for dir in $PATH
    do
	if [ -f "$dir/$1" ]
	then

            # check if this service is disabled at the boot monitor.
            if disabled $name; then return; fi

	    echo -n " $name"
	    "$@" &
	    return
	fi
    done
}

up()
{
    # Function to dynamically start a system service
    opt=""
    prefix=$(expr "$1 " : '\(-\)')
    if [ "$prefix" = "-" ];
    then
         opt=$1
         shift
    fi
    service=$1
    shift

    # First check if this service is disabled at the boot monitor.
    if disabled $service; then return; fi

    # Service is not disabled. Try to bring it up.
    found=""
    for dir in $SERVICES_DIRS
    do	bin=$dir/$service
	if [ -x $bin -a -z "$found" ]
	then	minix-service $opt up $bin "$@" 
    		echo -n " $service"
		found=yes
	fi
    done
    if [ -z "$found" ]
    then	echo " ($service not found in $SERVICES_DIRS)"
    fi
}

# Print a list of labels of detected PCI ethernet hardware devices.
get_pci_eth_labels()
{
	# We need to match all PCI ethernet hardware devices against all
	# drivers.  For performance reasons, we construct a lookup table on the
	# fly here.  In order to do that, we need to give both a list of all
	# available network drivers with PCI device IDs (part 1 of the code
	# below) and a list of all actually present ethernet hardware devices
	# (part 2) to an awk script (part 3).  The awk script can tell the
	# difference between the list entries based on whether there is a
	# leading space on the line.  For part 2, we grab only devices that are
	# in PCI class 2 (network controller) subclass 0 (ethernet controller).

	# Part 1: collect all network drivers with supported PCI IDs
	(for dir in $SYSTEM_CONF_DIRS; do
		for f in $dir/$SYSTEM_CONF_SUBDIR/*; do
			if [ -f $f ]; then
				printconfig $f | grep ',type net.*,pci device'
			fi
		done
	done | sed 's/^service \([^,]*\),.*,pci device/ \1/g';
	# Part 2: grab all PCI IDs of ethernet hardware devices (class 2/0)
	cat /proc/pci | grep '^[^ ]* 2/0/' | cut -d' ' -f3) | awk '
	# Part 3: first construct a PCI-ID-to-driver table based on the lines
	# produced by part 1 (with leading space), which each contain one
	# driver name followed by one or more PCI IDs; then, go through all
	# the ethernet hardware devices found in part 2 (no leading space) and
	# if if there is a hit in the table, print the driver label to use.
	/^ / { for (i=2;i<=NF;i++) drivers[$(i)]=$1 }
	/^[^ ]/ {
		# There is a bit of a discrepancy between output formats of
		# /proc/pci and printconfig: the former uses
		# "vid:did:sub_vid:sub_did" whereas the latter uses
		# "vid:did/sub_vid:sub_did".  No problem; in the common case
		# (= no sub IDs used) we need to split the PCI ID anyway.
		if (split($1,id,":") >= 4) {
			# Try a full "vid:did:sub_vid:sub_did" match.
			name=drivers[id[1]":"id[2]"/"id[3]":"id[4]]
		}
		# No sub IDs or no match found?  Try a "vid:did" match.
		if (!name) name=drivers[id[1]":"id[2]]
		# If found, print the resulting label (<name>_<instance>)
		if (name) {
			print name"_"(instance[name]+0)
			instance[name]++
		}
	}
	'
}

# Print a list of labels of ethernet hardware devices that have been detected
# to be present on the system.  Each label has the format '<driver>_<instance>'
# where <driver> is the file name of the driver (in /service) and <instance> is
# a zero-based, per-driver instance number of the device.
get_eth_labels() {
	# For now, do autodetection only on platforms with (x86) PCI support.
	# For (x86) ISA drivers, a custom network setting script is required;
	# see below.  For ARM platforms, the driver (if any) is started based
	# on the board; there is no device autodetection.
	if [ -f /proc/pci ]; then
		get_pci_eth_labels
	fi

	# Add any network drivers manually configured in /usr/etc/rc.local by
	# the netconf(8) utility.
	if [ -n "$netdriver" ]; then
		echo "${netdriver}_0"
	fi
}

# Detect expansion boards on the BeagleBone and load the proper drivers.
capemgr() {

    # Probe each possible cape EEPROM slave address for a BeagleBone cape.
    for slave_addr in 54 55 56 57
    do

        # See if there is a readable EEPROM with address ${slave_addr}.
        eepromread -f /dev/i2c-3 -a 0x${slave_addr} > /dev/null 2>&1
        RESULT=$?
	if [ $RESULT -eq 0 ]
	then

	    # Found an alive EEPROM. Try reading the cape name.
            CAPE=`eepromread -i -f /dev/i2c-3 -a 0x${slave_addr} | \
	        sed -n 's/^PART_NUMBER     : \(.*\)$/\1/p' | \
		sed -e 's/\.*$//g'` # Strip trailing periods.

	    # Look for a cape specific RC script.
            if [ -x /etc/rc.capes/${CAPE} ]
	    then

	        # CAT24C256 EEPROM -- all capes have this chip.
		test -e /dev/eepromb3s${slave_addr} || \
		    (cd /dev && MAKEDEV eepromb3s${slave_addr})
		up cat24c256 -dev /dev/eepromb3s${slave_addr} \
		    -label cat24c256.3.${slave_addr} \
		    -args "bus=3 address=0x${slave_addr}"

                # Load the drivers for the cape and do any other configuration.
		. "/etc/rc.capes/${CAPE}"

	    else

		echo ""
	        echo "** UNSUPPORTED CAPE: ${CAPE}"
		echo ""

	    fi
	fi
    done
}

case $action in
start)
    # Select console font.
    test -f /etc/font && loadfont /etc/font </dev/console

    # Cleanup.
    rm -rf /tmp/* /usr/run/* /usr/spool/lpd/* /usr/spool/locks/*

    # Start servers and drivers set at the boot monitor.
    echo -n "Starting services:"
    up -n random -dev /dev/random -period 3HZ

    # load random number generator
    if [ -f $RANDOM_FILE ]
    then
    	cat < $RANDOM_FILE >/dev/random
    	# overwrite $RANDOM_FILE. We don't want to use this data again
    	dd if=/dev/random of=$RANDOM_FILE bs=1024 count=1 2> /dev/null
    else
	# We couldn't find the old state to restart from, so use a binary
	# file and the current date instead, even if this is less than ideal.
	cat /bin/sh >> /dev/urandom
	date >> /dev/urandom
    fi

    # start network driver instances for all detected ethernet devices
    for label in $(get_eth_labels); do
        driver=$(echo $label | sed 's/\(.*\)_.*/\1/')
        instance=$(echo $label | sed 's/.*_//')
        eval arg=\$${driver}_arg
        if [ ! -z "$arg" ]; then arg=" $arg"; fi
        arg="-args \"instance=$instance$arg\""
        eval up $driver -label $label $arg -period 5HZ
    done

    # pty needs to know the "tty" group ID
    up pty -dev /dev/ptmx -args "gid=`stat -f '%g' /dev/ptmx`"

    # Start the LWIP service.
    up lwip -dev /dev/bpf -script /etc/rs.lwip

    # Load stable seed for TCP Initial Sequence Number generation (RFC 6528).
    # The idea here is that (especially) after a system crash, the seed stays
    # the same, so as to make it unlikely that incoming packets for connections
    # from before the crash are accepted on connections after the crash.
    TCPISN_LEN=$(sysctl -n net.inet.tcp.isn_secret | awk '{print length/2}')
    if [ ! -f $TCPISN_FILE ]; then
	# If the /usr file system is read-only, we cannot create the file.  In
	# that case, we draw a temporary secret from the random service.
	if grep ' \/usr .*rw.*' /etc/mtab >/dev/null; then
	    dd if=/dev/random of=$TCPISN_FILE bs=$TCPISN_LEN count=1 2>/dev/null
	else
	    TCPISN_FILE=/dev/random
	fi
    fi
    sysctl -qw net.inet.tcp.isn_secret=`dd if=$TCPISN_FILE bs=$TCPISN_LEN \
	count=1 2>/dev/null | hexdump -v -e '/1 "%02x"'` 2>/dev/null

    # LWIP does not block until all network drivers have fully initialized and
    # reported back to LWIP.  That may prevent proper configuration of the
    # corresponding interfaces a bit later.  Sleep up to five seconds waiting
    # for all registered network drivers to initialize and report to LWIP.
    for i in 1 2 3 4 5; do
	[ $(sysctl -n minix.lwip.drivers.pending) -gt 0 ] && sleep 1
    done

    up uds

    up -n ipc

    up log -dev /dev/klog

    if [ $ARCH = i386 ]
    then
	up -n printer -dev /dev/lp -period 10HZ
	# start VirtualBox time sync driver if the device is there
	if grep '^[^ ]* [^ ]* 80EE:CAFE[^ ]* ' /proc/pci >/dev/null; then
		up -n vbox -period 10HZ
	fi
    fi

    echo .

    echo -n "Starting daemons:"
    daemonize update

    # Ugly error message when starting cron from CD.
    # (and cron unnecessary then so..)
    if [ ! -f /CD ]
    then	daemonize cron
    else	mkdir /tmp/log
    		rm -f /var/log || true
		ln -s /tmp/log /var/log || true
		. /etc/rc.cd
    fi

    echo .

    # i2c only supported on ARM at the moment
    if [ $ARCH = earm ]
    then
	echo -n "Starting i2c subsystem: "
	for bus in 1 2 3
	do
		test -e /dev/i2c-${bus} || (cd /dev && MAKEDEV i2c-${bus})
		up i2c -dev /dev/i2c-${bus} -label i2c.${bus} \
			-args instance=${bus}
	done
	echo .

	BOARD_NAME=`sysenv board`
	case "${BOARD_NAME}" in

		ARM-ARMV7-TI-BB-WHITE)
			echo "Running on a BeagleBone"
			echo -n "Starting i2c device drivers: "

			# start EEPROM driver for reading board info
			test -e /dev/eepromb1s50 || \
				(cd /dev && MAKEDEV eepromb1s50)
			up cat24c256 -dev /dev/eepromb1s50 \
				-label cat24c256.1.50 \
				-args 'bus=1 address=0x50'

			# Start TPS65217 driver for power management.
			up tps65217 -label tps65217.1.24 \
			        -args 'bus=1 address=0x24'

			# Start ethernet driver.
			up lan8710a -label lan8710a_0 -args 'instance=0'

			# check for the presence of a display
			eepromread -f /dev/i2c-2 -n > /dev/null 2>&1
			RESULT=$?
			if [ $RESULT -eq 0 ]
			then
				# start eeprom driver for reading EDID.
				test -e /dev/eepromb2s50 || \
					(cd /dev && MAKEDEV eepromb2s50)
				up cat24c256 -dev /dev/eepromb2s50 \
					-label cat24c256.2.50 \
					-args 'bus=2 address=0x50'

				# start frame buffer
				#up fb -dev /dev/fb0 -args edid.0=cat24c256.2.50
				# fb hasn't been ported to AM335X yet.
			fi

			if [ -e /service/usbd ]
			then
				echo "Starting USBD"
				up usbd
			fi
			# Detect expansion boards and start drivers.
			capemgr

			;;

		ARM-ARMV7-TI-BB-BLACK)
			echo "Running on a BeagleBone Black"
			echo -n "Starting i2c device drivers: "

			# start EEPROM driver for reading board info
			test -e /dev/eepromb1s50 || \
				(cd /dev && MAKEDEV eepromb1s50)
			up cat24c256 -dev /dev/eepromb1s50 \
				-label cat24c256.1.50 \
				-args 'bus=1 address=0x50'

			# Start TPS65217 driver for power management.
			up tps65217 -label tps65217.1.24 \
			        -args 'bus=1 address=0x24'

			# Start TDA19988 driver for reading EDID.
			up tda19988 -label tda19988.1.3470 -args \
				'cec_bus=1 cec_address=0x34 hdmi_bus=1 hdmi_address=0x70'

			# Start ethernet driver.
			up lan8710a -label lan8710a_0 -args 'instance=0'

			# start frame buffer
			#up fb -dev /dev/fb0 -args edid.0=tda19988.1.3470
			# fb hasn't been ported to AM335X yet.

			if [ -e /service/usbd ]
			then
				echo "Starting USBD"
				up usbd
			fi
			# Detect expansion boards and start drivers.
			capemgr

			;;

		ARM-ARMV7-TI-BBXM-GENERIC)
			echo "Running on a BeagleBoard-xM"
			echo -n "Starting i2c device drivers: "

			# Start TPS65950 driver for power management.
			up tps65950 -label tps65950.1.48 \
				-args 'bus=1 address=0x48'

			# Set the system time to the time in the TPS65950's RTC
			readclock

			# check for the presence of a display
			eepromread -f /dev/i2c-3 -n > /dev/null 2>&1
			RESULT=$?
			if [ $RESULT -eq 0 ]
			then
				# start eeprom driver for reading edid
				test -e /dev/eepromb3s50 || \
					(cd /dev && MAKEDEV eepromb3s50)
				up cat24c256 -dev /dev/eepromb3s50 \
					-label cat24c256.3.50 \
					-args 'bus=3 address=0x50'

				# start frame buffer
				up fb -dev /dev/fb0 -args edid.0=cat24c256.3.50
			fi

			;;
	esac

	echo .
    fi

    # Load the stored hostname into the sysctl database.
    test -r /etc/hostname.file && hostname $(cat /etc/hostname.file)

    # Recover files being edited when the system crashed.
    test -f /usr/bin/elvprsv && elvprsv /usr/tmp/elv*

    # Run the daily cleanup on systems that are not on at night.
    test -f /usr/etc/daily && sh /usr/etc/daily boot &
;;
stop)
    	# Save random data, if /usr is mounted rw.
	if grep ' \/usr .*rw.*' /etc/mtab >/dev/null
	then
	  if dd if=/dev/random of=$RANDOM_FILE.new bs=1024 count=1 2>/dev/null
    	  then
    		mv $RANDOM_FILE.new $RANDOM_FILE
	  else
		echo 'Failed to save random data.'
	  fi
	fi
esac