#!/bin/bash
#
# For some information about how to work with qemu for ARM, please
# refer: http://fedoraproject.org/wiki/Architectures/ARM/HowToQemu


platformconfig=selected_platformconfig
# fallback to platformconfig in the same dir as this script
if [ ! -e "$platformconfig" ]; then
	platformconfig=$(dirname $0)/platformconfig
fi

#
# we need information about the platform
#
if [ ! -e "$platformconfig" ]; then
	echo "error: selected_platformconfig does not exist"
	echo "       please use 'ptxdist platform ...' or 'ptxdist --platformconfig=...'"
	exit 1
fi

source $platformconfig

if [ -n "${PTXCONF_PLATFORM}" ]; then
	PTXDIST_PLATFORMDIR="./platform-${PTXCONF_PLATFORM}"
else
	PTXDIST_PLATFORMDIR="."
fi

if [ ! -e "${PTXDIST_PLATFORMDIR}/images/linuximage" ]; then
	echo "error: run 'ptxdist go' first"
	exit 1
fi

if [ ! -e "${PTXDIST_PLATFORMDIR}/images/hd.img" ]; then
	echo "error: run 'ptxdist images' first"
	exit 1
fi

# the emulator to run
QEMU_EXEC=qemu-system-${PTXCONF_ARCH_STRING}

# disable this, if you want to have some graphics output
QEMU_NOGRAPHIC=-nographic

# Machine to emulate: The default kernel is prepared to run on "versatile pb"
QEMU_MACHINE=pc

#
# 'user mode' network related settings
#
PLATFORM_IP="10.0.2.7"

# the port a 'telned' would connect to (in the emulated sysem)
TELNET_INTERNAL_PORT=23
# port QEMU opens at the host side to give access to the ${TELNET_INTERNAL_PORT}
TELNET_EXTERNAL_PORT=4444

if [ -z "${VDE_SOCKET}" ]; then
	for dir in $(ls -d /var/run/vde2/*.ctl 2>/dev/null); do
		if [ -r "${dir}" ]; then
			VDE_SOCKET="${dir}"
		fi
	done
fi
if [ -n "${VDE_SOCKET}" ]; then
	if ${QEMU_EXEC} --help | grep -q -- '-net vde'; then
		QEMU_NET="-net vde,vlan=1,sock=${VDE_SOCKET}"
	fi
fi
if [ -z "${QEMU_NET}" ]; then
	QEMU_NET="-net user,vlan=1"
fi

# use this to load a kernel directly without grub
QEMU_KERNEL=" \
	-kernel ${PTXDIST_PLATFORMDIR}/images/linuximage \
	-append \"root=/dev/sda1 console=ttyS0,115200 ro\" \
	"

# do the job
${QEMU_EXEC} ${QEMU_NOGRAPHIC} \
	-M ${QEMU_MACHINE} \
	-no-reboot \
	-net nic,vlan=1 \
	${QEMU_NET} \
	-redir tcp:${TELNET_EXTERNAL_PORT}:${PLATFORM_IP}:${TELNET_INTERNAL_PORT} \
	-watchdog i6300esb -watchdog-action poweroff \
	-hda ${PTXDIST_PLATFORMDIR}/images/hd.img