#!/usr/bin/expect

##
# Reset the target machine or rather run the scenario with Qemu
#

proc check_version {qemu_version qemu_min qemu_max} {
	set version_min_list [split $qemu_min ".-"]
	set version_min_list_len [llength $version_min_list]

	set version_max_list [split $qemu_max ".-"]
	set version_max_list_len [llength $version_max_list]

	set version_list [split $qemu_version ".-"]
	set version_list_len [llength $version_list]

	set cmp 0
	set cmp_min 0
	set cmp_max 0
	set i 0

	foreach number $version_list {
		set min 0
		set max 0
		if { $i < $version_min_list_len } { set min [lindex $version_min_list $i] }
		if { $i < $version_max_list_len } { set max [lindex $version_max_list $i] }

		set cmp     [expr {$cmp  + $number * pow(1000, $version_list_len - $i) }]
		set cmp_min [expr {$cmp_min + $min * pow(1000, $version_list_len - $i) }]
		set cmp_max [expr {$cmp_max + $max * pow(1000, $version_list_len - $i) }]

		incr i
	}

	return [expr {($cmp_min < $cmp) && ($cmp < $cmp_max)}]
}

##
# Execute scenario using Qemu
#
proc run_power_on { } {
	global qemu_args
	global qemu
	global qemu_spawn_id

	#
	# Back out on platforms w/o Qemu support
	#
	if {![is_qemu_available]} { return 0 }

	if {[have_spec x86_32]} { set qemu "qemu-system-i386" }
	if {[have_spec x86_64]} { set qemu "qemu-system-x86_64" }
	if {[have_spec arm]}    { set qemu "qemu-system-arm" }
	if {[have_spec arm_64]} { set qemu "qemu-system-aarch64" }

	#
	# Only the x86_64 variant of Qemu provides the emulation of hardware
	# virtualization features used by NOVA. So let's always stick to this
	# variant of Qemu when working with NOVA even when operating in 32bit.
	#
	if {[have_spec nova]} { set qemu "qemu-system-x86_64" }

	#
	# Redirect serial output to stdio, but only when no explicit configuration
	# of serial interfaces is specified in the run script.
	# The 'mon' prefix enables the access to the qemu console.
	#
	if {![regexp -- {-serial} $qemu_args dummy]} {

		#
		# In the raspi3 model the first UART is never used as
		# log output, but the second
		#
		if {[have_spec rpi3]} { append qemu_args " -serial null " }
		append qemu_args " -serial mon:stdio "
	}

	# SVM virtualization is broken after $qemu_good_old and until before $qemu_good_new
	# We use "-cpu phenom" when using VMs in Qemu
	if {[regexp -- {-cpu phenom} $qemu_args dummy]} {
		catch {exec $qemu --version} qemu_version
		set qemu_version [regexp -inline {version[ ][0-9]+\.[0-9]+[\.0-9]*} $qemu_version]
		set qemu_version [regexp -inline {[0-9]+\.[0-9]+[\.0-9]*} $qemu_version]

		set qemu_good_old "2.4.1"
		set qemu_good_new "2.8.1"

		if {[check_version $qemu_version $qemu_good_old $qemu_good_new]} {
			puts "\nYour Qemu version '$qemu_version' is not working with AMD SVM virtualisation"
			puts "Known good Qemu versions are until $qemu_good_old and starting with $qemu_good_new\n"
			exit 1
		}
	}

	# tweak emulated platform for specific platforms
	if {[have_spec pbxa9]}  {
		#
		# For PBXA9 qemu adjusts provided RAM chips to the -m arg. Thus we
		# filter user values and force value that enables all chips that Genode
		# expects to be available. Not doing so leads to inexplicable errors.
		#
		regsub -all {\-m ([0-9])+} $qemu_args "" qemu_args
		append qemu_args " -m 768"
		append qemu_args " -M realview-pbx-a9"
	}
	if {[have_spec vpb926]} { append qemu_args " -M versatilepb     -m 128 " }
	if {[have_spec zynq_qemu]}   { append qemu_args " -M xilinx-zynq-a9 -cpu cortex-a9 -m 256 " }
	if {[have_spec rpi3]}   { append qemu_args " -M raspi3 -m 512 " }

	if {[have_spec virt_qemu]} {
		append qemu_args " -M virt,virtualization=true"
		if {[have_spec arm_v8a]} {
			append qemu_args ",gic-version=3 -cpu cortex-a53 -smp 4"
		}
		if {[have_spec arm_v7a]} {
			append qemu_args " -cpu cortex-a15 -smp 2"
		}
		append qemu_args " -m 2048"
	}

	# on x86, we support booting via pxe or iso/disk image
	if {[have_spec x86]} {
		if {![regexp -- {-m} $qemu_args dummy]} {
			if {[have_spec okl4]} {
				# okl4 system integration specifies RAM from 32 to 800 MiB
				append qemu_args " -m 800 "
			} else {
				append qemu_args " -m 512 "
			}
		}
		if {[have_include "load/tftp"]} {
			append qemu_args " -boot n -tftp [run_dir] -bootp boot/pulsar -no-reboot -no-shutdown "
		} else {
		if {[have_include "image/iso"]} {
			append qemu_args " -cdrom [run_dir].iso "
		} else {
		if {[have_include "image/disk"]} {
			append qemu_args " -drive format=raw,file=[run_dir].img "
		} else {
		if {[have_include "image/uefi"]} {
			set uefi_firmware "/usr/share/ovmf/OVMF.fd"
			if {![file exists $uefi_firmware]} {
				puts "'$uefi_firmware' uefi image missing. Please install a ovmf package matching your qemu version."
				exit -3
			}
			append qemu_args " --bios $uefi_firmware -net none -drive format=raw,file=[run_dir].img "

			# limit boot resolution in Qemu to 1920x1080
			append qemu_args " -device VGA,vgamem_mb=8 "
		} else {
			puts "Aborting, cannot execute Qemu without a ISO or disk image"
			exit -4
		} } } }

		append qemu_args " -machine q35 "
	}

	# on ARM, we supply the boot image as kernel
	if {[have_spec arm] || [have_spec arm_v8]} { append qemu_args " -kernel [run_dir]/boot/image.elf " }

	eval spawn $qemu $qemu_args
	set qemu_spawn_id $spawn_id

	return true
}