#!/bin/bash -x

# Handle running OE images under qemu
#
# Copyright (C) 2006-2011 Linux Foundation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# Call setting:
#   QEMU_MEMORY (optional) - set the amount of memory in the emualted system.
#   SERIAL_LOGFILE (optional) - log the serial port output to a file
#   CROSSPATH - the path to any cross toolchain to use with distcc
#
# Image options:
#   MACHINE - the machine to run
#   FSTYPE - the image type to run
#   KERNEL - the kernel image file to use
#   ROOTFS - the disk image file to use
#


mem_size=-1

#Get rid of <> and get the contents of extra qemu running params
SCRIPT_QEMU_EXTRA_OPT=`echo $SCRIPT_QEMU_EXTRA_OPT | sed -e 's/<//' -e 's/>//'`
#if user set qemu memory, eg: -m 256 in qemu extra params, we need to do some 
# validation check
mem_set=`expr "$SCRIPT_QEMU_EXTRA_OPT" : '.*\(-m[[:space:]] *[0-9]*\)'`
if [ ! -z "$mem_set" ] ; then
#Get memory setting size from user input
  mem_size=`echo $mem_set | sed 's/-m[[:space:]] *//'`
else
    case "$MACHINE" in
        "qemux86")
            mem_size=128
            ;;
        "qemux86-64")
            mem_size=128
            ;;
        "qemuarm")
            mem_size=128
            ;;
        "qemumips")
            mem_size=128
            ;;
        "qemuppc")
            mem_size=128
            ;;
        *)
            mem_size=64
            ;;
    esac

fi

# QEMU_MEMORY has 'M' appended to mem_size
QEMU_MEMORY="$mem_size"M

# Bug 433: qemuarm cannot use > 128 MB RAM
if [ "$MACHINE" = "qemuarm" ]; then
    if [[ -z "$mem_size" || $mem_size -gt 128 ]]; then
        echo "WARNING: qemuarm does not support > 128M of RAM."
        echo "Changing QEMU_MEMORY to default of 128M."
        QEMU_MEMORY="128M"
        SCRIPT_QEMU_EXTRA_OPT=`echo $SCRIPT_QEMU_EXTRA_OPT | sed -e "s/$mem_set/-m 128/" `
    fi
fi

# We need to specify -m <mem_size> to overcome a bug in qemu 0.14.0
# https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/584480

if [ -z "$mem_set" ] ; then
  SCRIPT_QEMU_EXTRA_OPT="$SCRIPT_QEMU_EXTRA_OPT -m $mem_size"
fi
# This file is created when runqemu-gen-tapdevs creates a bank of tap
# devices, indicating that the user should not bring up new ones using
# sudo.
NOSUDO_FLAG="/etc/runqemu-nosudo"

QEMUIFUP=`which runqemu-ifup`
QEMUIFDOWN=`which runqemu-ifdown`

NFSRUNNING="false"

acquire_lock() {
    lockfile=$1
    if [ -z "$lockfile" ]; then
        echo "Error: missing lockfile arg passed to acquire_lock()"
        return 1
    fi

    if [ -e "$lockfile.lock" ]; then
        # Check that the lockfile is not stale
        ps=`ps -ewwo pid | grep $(cat $lockfile.lock)`
        if [ -z "$ps" ]; then
            echo "WARNING: Stale lock file detected, deleting $lockfile.lock."
            rm -f $lockfile.lock
            echo $$ > $lockfile.lock
        else
            return 1
        fi
    else
        echo $$ > $lockfile.lock
    fi

    return 0
}

release_lock() {
    lockfile=$1
    if [ -z "$lockfile" ]; then
        echo "Error: missing lockfile arg passed to release_lock()"
        return 1
    fi

    rm -f $lockfile.lock
}

LOCKDIR="/tmp/qemu-tap-locks"
if [ ! -d "$LOCKDIR" ]; then
    mkdir $LOCKDIR
    chmod 777 $LOCKDIR
fi

IFCONFIG=`which ifconfig`
if [ -z "$IFCONFIG" ]; then
    IFCONFIG=/sbin/ifconfig
fi

POSSIBLE=`$IFCONFIG -a | grep '^tap' | awk '{print $1}'`
TAP=""
LOCKFILE=""
for tap in $POSSIBLE; do
    LOCKFILE="$LOCKDIR/$tap"
    echo "Acquiring lockfile for $tap..."
    acquire_lock $LOCKFILE
    if [ $? -eq 0 ]; then
        TAP=$tap
        break
    fi
done

if [ "$TAP" = "" ]; then
    if [ -e "$NOSUDO_FLAG" ]; then
        echo "Error: There are no available tap devices to use for networking,"
        echo "and I see $NOSUDO_FLAG exists, so I am not going to try creating"
        echo "a new one with sudo."
        exit 1
    fi

    GROUPID=`id -g`
    echo "Setting up tap interface under sudo"
    tap=`sudo $QEMUIFUP $GROUPID $OECORE_NATIVE_SYSROOT`
    if [ $? -ne 0 ]; then
        # Re-run standalone to see verbose errors
        sudo $QEMUIFUP $GROUPID $OECORE_NATIVE_SYSROOT
        return
    fi
    LOCKFILE="$LOCKDIR/$tap"
    echo "Acquiring lockfile for $tap..."
    acquire_lock $LOCKFILE
    if [ $? -eq 0 ]; then
        TAP=$tap
    fi 
else
    echo "Using preconfigured tap device '$TAP'"
fi

cleanup() {
    if [ ! -e "$NOSUDO_FLAG" ]; then
        sudo $QEMUIFDOWN $TAP $OECORE_NATIVE_SYSROOT
    fi
    echo "Releasing lockfile of preconfigured tap device '$TAP'"
    release_lock $LOCKFILE

    if [ "$NFSRUNNING" = "true" ]; then
        echo "Shutting down the userspace NFS server..."
        echo "runqemu-export-rootfs stop $ROOTFS"
        runqemu-export-rootfs stop $ROOTFS
    fi
    # If QEMU crashes or somehow tty properties are not restored
    # after qemu exits, we need to run stty sane
    stty sane
}

n1=$[ (`echo $TAP | sed 's/tap//'` * 2) + 1 ]
n2=$[ (`echo $TAP | sed 's/tap//'` * 2) + 2 ]

KERNEL_NETWORK_CMD="ip=192.168.7.$n2::192.168.7.$n1:255.255.255.0"
QEMU_TAP_CMD="-net tap,vlan=0,ifname=$TAP,script=no,downscript=no"
QEMU_NETWORK_CMD="-net nic,vlan=0 $QEMU_TAP_CMD"
KERNCMDLINE="mem=$QEMU_MEMORY"
QEMU_UI_OPTIONS="-show-cursor -usb -usbdevice wacom-tablet"

NFS_INSTANCE=`echo $TAP | sed 's/tap//'`
export NFS_INSTANCE

SERIALOPTS=""
if [ "x$SERIAL_LOGFILE" != "x" ]; then
    SERIALOPTS="-serial file:$SERIAL_LOGFILE"
fi

case "$MACHINE" in
    "qemuarm") ;;
    "qemumips") ;;
    "qemuppc") ;;
    "qemuarmv6") ;;
    "qemuarmv7") ;;
    "qemux86") ;;
    "qemux86-64") ;;
    "akita") ;;
    "spitz") ;;
    *)
        echo "Error: Unsupported machine type $MACHINE"
        return
    ;;
esac

if [ ! -f "$KERNEL" ]; then
    echo "Error: Kernel image file $KERNEL doesn't exist"
    cleanup
    return
fi

if [ "$FSTYPE" != "nfs" -a ! -f "$ROOTFS" ]; then
    echo "Error: Image file $ROOTFS doesn't exist"
    cleanup
    return
fi

if [ "$FSTYPE" = "nfs" ]; then
    NFS_SERVER="192.168.7.1"
    NFS_DIR=`echo $ROOTFS | sed 's/^[^:]*:\(.*\)/\1/'`
    MOUNTD_PORT=$[ 21111 + $NFS_INSTANCE ]
    NFSD_PORT=$[ 11111 + $NFS_INSTANCE ]
    UNFS_OPTS="nfsvers=2,mountprog=$MOUNTD_PORT,nfsprog=$NFSD_PORT,udp"

    PSEUDO_LOCALSTATEDIR=~/.runqemu-sdk/pseudo
    export PSEUDO_LOCALSTATEDIR

    rpcbind_running=`ps ax | grep rpcbind | grep -v grep | wc -l`
    portmap_running=`ps ax | grep portmap | grep -v grep | wc -l`
    if [[ $rpcbind_running == 0 && $portmap_running == 0 ]]; then
        echo "You need to be running either rpcbind or portmap to continue"
        cleanup
        return
    fi

    # Start the userspace NFS server
    echo "runqemu-export-rootfs restart $ROOTFS"
    runqemu-export-rootfs restart $ROOTFS
    if [ $? != 0 ]; then
        cleanup
        return
    fi
    NFSRUNNING="true"
fi

if [ "$NFS_SERVER" = "" ]; then
    NFS_SERVER="192.168.7.1"
    NFS_DIR=$ROOTFS
fi

if [ "$MACHINE" = "qemuarm" -o "$MACHINE" = "qemuarmv6" -o "$MACHINE" = "qemuarmv7" ]; then
    QEMU=qemu-system-arm
    MACHINE_SUBTYPE=versatilepb
    QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS"
    # QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS -force-pointer"
    if [ "$FSTYPE" = "ext3" ]; then
        KERNCMDLINE="root=/dev/sda rw console=ttyAMA0,115200 console=tty $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY highres=off"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -M versatilepb -hda $ROOTFS -no-reboot $QEMU_UI_OPTIONS"
    fi
    if [ "$FSTYPE" = "nfs" ]; then
        if [ "$NFS_SERVER" = "192.168.7.1" -a ! -d "$NFS_DIR" ]; then
            echo "Error: NFS mount point $ROOTFS doesn't exist"
            cleanup
            return
        fi
        KERNCMDLINE="root=/dev/nfs nfsroot=$NFS_SERVER:$NFS_DIR,$UNFS_OPTS rw $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -M versatilepb --no-reboot $QEMU_UI_OPTIONS"
    fi
    if [ "$MACHINE" = "qemuarmv6" ]; then
        QEMUOPTIONS="$QEMUOPTIONS -cpu arm1136"
    fi
    if [ "$MACHINE" = "qemuarmv7" ]; then
        QEMUOPTIONS="$QEMUOPTIONS -cpu cortex-a8"
    fi
fi

if [ "$MACHINE" = "qemux86" ]; then
    QEMU=qemu
    QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS -vga vmware -enable-gl"
    if [ "$FSTYPE" = "ext3" ]; then
        KERNCMDLINE="vga=0 root=/dev/hda rw mem=$QEMU_MEMORY $KERNEL_NETWORK_CMD"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -hda $ROOTFS $QEMU_UI_OPTIONS"
    fi
    if [ "$FSTYPE" = "nfs" ]; then
        if [ "$NFS_SERVER" = "192.168.7.1" -a ! -d "$NFS_DIR" ]; then
            echo "Error: NFS mount point $ROOTFS doesn't exist."
            cleanup
            return
        fi
        KERNCMDLINE="root=/dev/nfs nfsroot=$NFS_SERVER:$NFS_DIR,$UNFS_OPTS rw $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD $QEMU_UI_OPTIONS"
    fi
    # Currently oprofile's event based interrupt mode doesn't work(Bug #828) in
    # qemux86 and qemux86-64. We can use timer interrupt mode for now.
    KERNCMDLINE="$KERNCMDLINE oprofile.timer=1"
fi

if [ "$MACHINE" = "qemux86-64" ]; then
    QEMU=qemu-system-x86_64
    QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS -vga vmware -enable-gl"
    if [ "$FSTYPE" = "ext3" ]; then
        KERNCMDLINE="vga=0 root=/dev/hda rw mem=$QEMU_MEMORY $KERNEL_NETWORK_CMD"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -hda $ROOTFS $QEMU_UI_OPTIONS"
    fi
    if [ "$FSTYPE" = "nfs" ]; then
        if [ "x$ROOTFS" = "x" ]; then
            ROOTFS=/srv/nfs/qemux86-64
        fi
        if [ ! -d "$ROOTFS" ]; then
            echo "Error: NFS mount point $ROOTFS doesn't exist."
            cleanup
            return
        fi
        KERNCMDLINE="root=/dev/nfs nfsroot=$NFS_SERVER:$NFS_DIR,$UNFS_OPTS rw $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD $QEMU_UI_OPTIONS"
    fi
    # Currently oprofile's event based interrupt mode doesn't work(Bug #828) in
    # qemux86 and qemux86-64. We can use timer interrupt mode for now.
    KERNCMDLINE="$KERNCMDLINE oprofile.timer=1"
fi

if [ "$MACHINE" = "spitz" ]; then
    QEMU=qemu-system-arm
    if [ "$FSTYPE" = "ext3" ]; then
        echo $ROOTFS
        ROOTFS=`readlink -f $ROOTFS`
        echo $ROOTFS
        if [ ! -e "$ROOTFS.qemudisk" ]; then
            echo "Adding a partition table to the ext3 image for use by QEMU, please wait..."
            runqemu-addptable2image $ROOTFS $ROOTFS.qemudisk
        fi
        QEMUOPTIONS="$QEMU_NETWORK_CMD -M spitz -hda $ROOTFS.qemudisk -portrait"
    fi
fi

if [ "$MACHINE" = "qemumips" ]; then
    QEMU=qemu-system-mips
    MACHINE_SUBTYPE=malta
    QEMU_UI_OPTIONS="-vga cirrus $QEMU_UI_OPTIONS"
    if [ "$FSTYPE" = "ext3" ]; then
        #KERNCMDLINE="root=/dev/hda console=ttyS0 console=tty0 $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        KERNCMDLINE="root=/dev/hda rw console=ttyS0 console=tty $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -M $MACHINE_SUBTYPE -hda $ROOTFS -no-reboot $QEMU_UI_OPTIONS"
    fi
    if [ "$FSTYPE" = "nfs" ]; then
        if [ "$NFS_SERVER" = "192.168.7.1" -a ! -d "$NFS_DIR" ]; then
            echo "Error: NFS mount point $ROOTFS doesn't exist"
            cleanup
            return
        fi
        KERNCMDLINE="root=/dev/nfs console=ttyS0 console=tty nfsroot=$NFS_SERVER:$NFS_DIR,$UNFS_OPTS rw $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -M $MACHINE_SUBTYPE -no-reboot $QEMU_UI_OPTIONS"
    fi
fi

if [ "$MACHINE" = "qemuppc" ]; then
    QEMU=qemu-system-ppc
    MACHINE_SUBTYPE=prep
    CPU_SUBTYPE=603e
    BIOS=powerpc_rom.bin
    QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS -nographic"
    if [ "$FSTYPE" = "ext3" ]; then
        KERNCMDLINE="root=/dev/hda rw console=ttyS0 console=tty0 $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -cpu $CPU_SUBTYPE -M $MACHINE_SUBTYPE -bios $BIOS -hda $ROOTFS -no-reboot $QEMU_UI_OPTIONS"
    fi
    if [ "$FSTYPE" = "nfs" ]; then
        if [ "$NFS_SERVER" = "192.168.7.1" -a ! -d "$NFS_DIR" ]; then
            echo "Error: NFS mount point $ROOTFS doesn't exist"
            cleanup
            return
        fi
        KERNCMDLINE="root=/dev/nfs console=ttyS0 console=tty0 nfsroot=$NFS_SERVER:$NFS_DIR,$UNFS_OPTS rw $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -cpu $CPU_SUBTYPE -M $MACHINE_SUBTYPE -bios $BIOS -no-reboot $QEMU_UI_OPTIONS"
    fi
fi

if [ "$MACHINE" = "akita" ]; then
    QEMU=qemu-system-arm
    if [ "$FSTYPE" = "jffs2" ]; then
        ROOTFS=`readlink -f $ROOTFS`
        if [ ! -e "$ROOTFS.qemuflash" ]; then
            echo "Converting raw image into flash image format for use by QEMU, please wait..."
        raw2flash.akita < $ROOTFS > $ROOTFS.qemuflash
        fi
        QEMUOPTIONS="$QEMU_NETWORK_CMD -M akita -mtdblock $ROOTFS.qemuflash -portrait"
    fi
fi

if [ "x$QEMUOPTIONS" = "x" ]; then
    echo "Error: Unable to support this combination of options"
    cleanup
    return
fi

PATH=$CROSSPATH:$OECORE_NATIVE_SYSROOT/usr/bin:$PATH

QEMUBIN=`which $QEMU`
if [ ! -x "$QEMUBIN" ]; then
    echo "Error: No QEMU binary '$QEMU' could be found."
    cleanup
    return
fi

function _quit() {
    if [ -n "$PIDFILE" ]; then
        #echo kill `cat $PIDFILE`
        kill `cat $PIDFILE`
    fi
    cleanup
    return
}

DISTCCD=`which distccd`
PIDFILE=""

trap _quit INT TERM QUIT

if [ -x "$DISTCCD" ]; then
    echo "Starting distccd..."
    PIDFILE=`mktemp`
    $DISTCCD --allow 192.168.7.2 --daemon --pid-file $PIDFILE &
else
    echo "WARNING: distccd not present, no distcc support loaded."
fi

# qemu got segfault if linked with nVidia's libgl
GL_LD_PRELOAD=$LD_PRELOAD

if ldd $QEMUBIN | grep -i nvidia &> /dev/null
then
cat << EOM
WARNING: nVidia proprietary OpenGL libraries detected.
nVidia's OpenGL libraries are known to have compatibility issues with qemu,
resulting in a segfault. Please uninstall these drivers or ensure the mesa libGL
libraries precede nvidia's via LD_PRELOAD(Already do it on Ubuntu).
EOM

# Automatically use Ubuntu system's mesa libGL, other distro can add its own path
    if grep -i ubuntu /etc/lsb-release &> /dev/null
    then
        echo "Skip nVidia's libGL on Ubuntu!"
        GL_LD_PRELOAD="/usr/lib/libGL.so $LD_PRELOAD"
    fi
fi

echo "Running $QEMU..."
# -no-reboot is a mandatory option - see bug #100
echo $QEMUBIN -kernel $KERNEL $QEMUOPTIONS $SERIALOPTS -no-reboot $SCRIPT_QEMU_OPT $SCRIPT_QEMU_EXTRA_OPT --append '"'$KERNCMDLINE $SCRIPT_KERNEL_OPT'"'
LD_PRELOAD="$GL_LD_PRELOAD" $QEMUBIN -kernel $KERNEL $QEMUOPTIONS $SERIALOPTS -no-reboot $SCRIPT_QEMU_OPT $SCRIPT_QEMU_EXTRA_OPT --append "$KERNCMDLINE $SCRIPT_KERNEL_OPT"


cleanup

trap - INT TERM QUIT
return