#!/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)}]
}

##
#
#
proc board_qemu_args { } {

	set qemu_args_file [file join "board" [board] "qemu_args"]

	set repo [repository_contains $qemu_args_file]

	if {$repo == ""} {
		return ""
	}

	set fh [open [file join $repo $qemu_args_file] "RDONLY"]
	set file_content [read $fh]
	close $fh

	##
	# Each line is appended to qemu_args.
	#
	set qemu_args ""
	foreach line [split $file_content "\n"] {
			# general arguments
			append qemu_args " $line"
	}

	return $qemu_args
}

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

	# save original qemu_args to support retrying
	set original_qemu_args $qemu_args

	#
	# 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" }
	if {[have_spec riscv]}  { set qemu "qemu-system-riscv64" }

	#
	# 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_board 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
		}
	}

	# on x86, we support booting via pxe or iso/disk image
	if {[have_board pc]} {

		if {[regexp -- {-m\s+} $qemu_args dummy]} {
			# can be -m 1024 or -m 1024G or -m size=1024G
			set qemu_ram [regexp -inline {\-m\s+\S+} $qemu_args]
			if {![regexp {([0-9]+)([MG]?)} $qemu_ram dummy qemu_ram ram_unit]} {
				puts "Cannot parse memory argument ($qemu_ram)\n"
				exit 1
			}

			if { $ram_unit == "G" } {
				set qemu_ram [expr {$qemu_ram*1024}] }

			if {[have_spec okl4]} {
				if {$qemu_ram < 800} {
					puts "Configured memory ($qemu_ram) for OKL4 on Qemu must be at least 800M\n"
					exit 1
				}
			}
		} else {
			##
			# append memory argument if not present, 800M is a sane default because:
			# - 800M is minimum for OKL4
			# - 768M is required for certain test cases (#3387)
			#
			append qemu_args " -m 800 "
		}

		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
		} } } }
	}

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

	set board_qemu_args [board_qemu_args]

	##
	# remove any -m arguments from qemu args if specified by board_qemu_args
	# note, that we must not match/remove -machine, but allow -m size=1G,slots=3,maxmem=4G
	if {[regexp -- {-m\s+} $board_qemu_args dummy]} {
		regsub -all {\-m\s+\S+} $qemu_args "" qemu_args }

	##
	# let user override any netdev
	#
	if {[regexp -- {-netdev\s+user,id=(\w+)} $qemu_args dummy netdev]} {
		regsub -all "\\-netdev\\s+user,id=$netdev\\S*" $board_qemu_args "" board_qemu_args }

	# append custom board-specific qemu_args
	append qemu_args " $board_qemu_args"

	eval spawn $qemu $qemu_args
	set qemu_spawn_id $spawn_id

	# restore original qemu_args to support retrying
	set qemu_args $original_qemu_args

	return true
}