poky/meta/classes/kernel-fitimage.bbclass

inherit kernel-uboot kernel-artifact-names uboot-sign

python __anonymous () {
    kerneltypes = d.getVar('KERNEL_IMAGETYPES') or ""
    if 'fitImage' in kerneltypes.split():
        depends = d.getVar("DEPENDS")
        depends = "%s u-boot-tools-native dtc-native" % depends
        d.setVar("DEPENDS", depends)

        uarch = d.getVar("UBOOT_ARCH")
        if uarch == "arm64":
            replacementtype = "Image"
        elif uarch == "riscv":
            replacementtype = "Image"
        elif uarch == "mips":
            replacementtype = "vmlinuz.bin"
        elif uarch == "x86":
            replacementtype = "bzImage"
        elif uarch == "microblaze":
            replacementtype = "linux.bin"
        else:
            replacementtype = "zImage"

        # Override KERNEL_IMAGETYPE_FOR_MAKE variable, which is internal
        # to kernel.bbclass . We have to override it, since we pack zImage
        # (at least for now) into the fitImage .
        typeformake = d.getVar("KERNEL_IMAGETYPE_FOR_MAKE") or ""
        if 'fitImage' in typeformake.split():
            d.setVar('KERNEL_IMAGETYPE_FOR_MAKE', typeformake.replace('fitImage', replacementtype))

        image = d.getVar('INITRAMFS_IMAGE')
        if image:
            d.appendVarFlag('do_assemble_fitimage_initramfs', 'depends', ' ${INITRAMFS_IMAGE}:do_image_complete')

        #check if there are any dtb providers
        providerdtb = d.getVar("PREFERRED_PROVIDER_virtual/dtb")
        if providerdtb:
            d.appendVarFlag('do_assemble_fitimage', 'depends', ' virtual/dtb:do_populate_sysroot')
            d.appendVarFlag('do_assemble_fitimage_initramfs', 'depends', ' virtual/dtb:do_populate_sysroot')
            d.setVar('EXTERNAL_KERNEL_DEVICETREE', "${RECIPE_SYSROOT}/boot/devicetree")

        # Verified boot will sign the fitImage and append the public key to
        # U-Boot dtb. We ensure the U-Boot dtb is deployed before assembling
        # the fitImage:
        if d.getVar('UBOOT_SIGN_ENABLE') == "1" and d.getVar('UBOOT_DTB_BINARY'):
            uboot_pn = d.getVar('PREFERRED_PROVIDER_u-boot') or 'u-boot'
            d.appendVarFlag('do_assemble_fitimage', 'depends', ' %s:do_populate_sysroot' % uboot_pn)
}

# Options for the device tree compiler passed to mkimage '-D' feature:
UBOOT_MKIMAGE_DTCOPTS ??= ""

# fitImage Hash Algo
FIT_HASH_ALG ?= "sha256"

# fitImage Signature Algo
FIT_SIGN_ALG ?= "rsa2048"

# Generate keys for signing fitImage
FIT_GENERATE_KEYS ?= "0"

# Size of private key in number of bits
FIT_SIGN_NUMBITS ?= "2048"

# args to openssl genrsa (Default is just the public exponent)
FIT_KEY_GENRSA_ARGS ?= "-F4"

# args to openssl req (Default is -batch for non interactive mode and
# -new for new certificate)
FIT_KEY_REQ_ARGS ?= "-batch -new"

# Standard format for public key certificate
FIT_KEY_SIGN_PKCS ?= "-x509"

#
# Emit the fitImage ITS header
#
# $1 ... .its filename
fitimage_emit_fit_header() {
	cat << EOF >> ${1}
/dts-v1/;

/ {
        description = "U-Boot fitImage for ${DISTRO_NAME}/${PV}/${MACHINE}";
        #address-cells = <1>;
EOF
}

#
# Emit the fitImage section bits
#
# $1 ... .its filename
# $2 ... Section bit type: imagestart - image section start
#                          confstart  - configuration section start
#                          sectend    - section end
#                          fitend     - fitimage end
#
fitimage_emit_section_maint() {
	case $2 in
	imagestart)
		cat << EOF >> ${1}

        images {
EOF
	;;
	confstart)
		cat << EOF >> ${1}

        configurations {
EOF
	;;
	sectend)
		cat << EOF >> ${1}
	};
EOF
	;;
	fitend)
		cat << EOF >> ${1}
};
EOF
	;;
	esac
}

#
# Emit the fitImage ITS kernel section
#
# $1 ... .its filename
# $2 ... Image counter
# $3 ... Path to kernel image
# $4 ... Compression type
fitimage_emit_section_kernel() {

	kernel_csum="${FIT_HASH_ALG}"

	ENTRYPOINT="${UBOOT_ENTRYPOINT}"
	if [ -n "${UBOOT_ENTRYSYMBOL}" ]; then
		ENTRYPOINT=`${HOST_PREFIX}nm vmlinux | \
			awk '$3=="${UBOOT_ENTRYSYMBOL}" {print "0x"$1;exit}'`
	fi

	cat << EOF >> ${1}
                kernel@${2} {
                        description = "Linux kernel";
                        data = /incbin/("${3}");
                        type = "kernel";
                        arch = "${UBOOT_ARCH}";
                        os = "linux";
                        compression = "${4}";
                        load = <${UBOOT_LOADADDRESS}>;
                        entry = <${ENTRYPOINT}>;
                        hash@1 {
                                algo = "${kernel_csum}";
                        };
                };
EOF
}

#
# Emit the fitImage ITS DTB section
#
# $1 ... .its filename
# $2 ... Image counter
# $3 ... Path to DTB image
fitimage_emit_section_dtb() {

	dtb_csum="${FIT_HASH_ALG}"

	dtb_loadline=""
	dtb_ext=${DTB##*.}
	if [ "${dtb_ext}" = "dtbo" ]; then
		if [ -n "${UBOOT_DTBO_LOADADDRESS}" ]; then
			dtb_loadline="load = <${UBOOT_DTBO_LOADADDRESS}>;"
		fi
	elif [ -n "${UBOOT_DTB_LOADADDRESS}" ]; then
		dtb_loadline="load = <${UBOOT_DTB_LOADADDRESS}>;"
	fi
	cat << EOF >> ${1}
                fdt@${2} {
                        description = "Flattened Device Tree blob";
                        data = /incbin/("${3}");
                        type = "flat_dt";
                        arch = "${UBOOT_ARCH}";
                        compression = "none";
                        ${dtb_loadline}
                        hash@1 {
                                algo = "${dtb_csum}";
                        };
                };
EOF
}

#
# Emit the fitImage ITS setup section
#
# $1 ... .its filename
# $2 ... Image counter
# $3 ... Path to setup image
fitimage_emit_section_setup() {

	setup_csum="${FIT_HASH_ALG}"

	cat << EOF >> ${1}
                setup@${2} {
                        description = "Linux setup.bin";
                        data = /incbin/("${3}");
                        type = "x86_setup";
                        arch = "${UBOOT_ARCH}";
                        os = "linux";
                        compression = "none";
                        load = <0x00090000>;
                        entry = <0x00090000>;
                        hash@1 {
                                algo = "${setup_csum}";
                        };
                };
EOF
}

#
# Emit the fitImage ITS ramdisk section
#
# $1 ... .its filename
# $2 ... Image counter
# $3 ... Path to ramdisk image
fitimage_emit_section_ramdisk() {

	ramdisk_csum="${FIT_HASH_ALG}"
	ramdisk_loadline=""
	ramdisk_entryline=""

	if [ -n "${UBOOT_RD_LOADADDRESS}" ]; then
		ramdisk_loadline="load = <${UBOOT_RD_LOADADDRESS}>;"
	fi
	if [ -n "${UBOOT_RD_ENTRYPOINT}" ]; then
		ramdisk_entryline="entry = <${UBOOT_RD_ENTRYPOINT}>;"
	fi

	cat << EOF >> ${1}
                ramdisk@${2} {
                        description = "${INITRAMFS_IMAGE}";
                        data = /incbin/("${3}");
                        type = "ramdisk";
                        arch = "${UBOOT_ARCH}";
                        os = "linux";
                        compression = "none";
                        ${ramdisk_loadline}
                        ${ramdisk_entryline}
                        hash@1 {
                                algo = "${ramdisk_csum}";
                        };
                };
EOF
}

#
# Emit the fitImage ITS configuration section
#
# $1 ... .its filename
# $2 ... Linux kernel ID
# $3 ... DTB image name
# $4 ... ramdisk ID
# $5 ... config ID
# $6 ... default flag
fitimage_emit_section_config() {

	conf_csum="${FIT_HASH_ALG}"
	conf_sign_algo="${FIT_SIGN_ALG}"
	if [ -n "${UBOOT_SIGN_ENABLE}" ] ; then
		conf_sign_keyname="${UBOOT_SIGN_KEYNAME}"
	fi

	# Test if we have any DTBs at all
	sep=""
	conf_desc=""
	conf_node="conf@"
	kernel_line=""
	fdt_line=""
	ramdisk_line=""
	setup_line=""
	default_line=""

	# conf node name is selected based on dtb ID if it is present,
	# otherwise its selected based on kernel ID
	if [ -n "${3}" ]; then
		conf_node=$conf_node${3}
	else
		conf_node=$conf_node${2}
	fi

	if [ -n "${2}" ]; then
		conf_desc="Linux kernel"
		sep=", "
		kernel_line="kernel = \"kernel@${2}\";"
	fi

	if [ -n "${3}" ]; then
		conf_desc="${conf_desc}${sep}FDT blob"
		sep=", "
		fdt_line="fdt = \"fdt@${3}\";"
	fi

	if [ -n "${4}" ]; then
		conf_desc="${conf_desc}${sep}ramdisk"
		sep=", "
		ramdisk_line="ramdisk = \"ramdisk@${4}\";"
	fi

	if [ -n "${5}" ]; then
		conf_desc="${conf_desc}${sep}setup"
		setup_line="setup = \"setup@${5}\";"
	fi

	if [ "${6}" = "1" ]; then
		# default node is selected based on dtb ID if it is present,
		# otherwise its selected based on kernel ID
		if [ -n "${3}" ]; then
			default_line="default = \"conf@${3}\";"
		else
			default_line="default = \"conf@${2}\";"
		fi
	fi

	cat << EOF >> ${1}
                ${default_line}
                $conf_node {
			description = "${6} ${conf_desc}";
			${kernel_line}
			${fdt_line}
			${ramdisk_line}
			${setup_line}
                        hash@1 {
                                algo = "${conf_csum}";
                        };
EOF

	if [ ! -z "${conf_sign_keyname}" ] ; then

		sign_line="sign-images = "
		sep=""

		if [ -n "${2}" ]; then
			sign_line="${sign_line}${sep}\"kernel\""
			sep=", "
		fi

		if [ -n "${3}" ]; then
			sign_line="${sign_line}${sep}\"fdt\""
			sep=", "
		fi

		if [ -n "${4}" ]; then
			sign_line="${sign_line}${sep}\"ramdisk\""
			sep=", "
		fi

		if [ -n "${5}" ]; then
			sign_line="${sign_line}${sep}\"setup\""
		fi

		sign_line="${sign_line};"

		cat << EOF >> ${1}
                        signature@1 {
                                algo = "${conf_csum},${conf_sign_algo}";
                                key-name-hint = "${conf_sign_keyname}";
				${sign_line}
                        };
EOF
	fi

	cat << EOF >> ${1}
                };
EOF
}

#
# Assemble fitImage
#
# $1 ... .its filename
# $2 ... fitImage name
# $3 ... include ramdisk
fitimage_assemble() {
	kernelcount=1
	dtbcount=""
	DTBS=""
	ramdiskcount=${3}
	setupcount=""
	rm -f ${1} arch/${ARCH}/boot/${2}

	fitimage_emit_fit_header ${1}

	#
	# Step 1: Prepare a kernel image section.
	#
	fitimage_emit_section_maint ${1} imagestart

	uboot_prep_kimage
	fitimage_emit_section_kernel ${1} "${kernelcount}" linux.bin "${linux_comp}"

	#
	# Step 2: Prepare a DTB image section
	#

	if [ -z "${EXTERNAL_KERNEL_DEVICETREE}" ] && [ -n "${KERNEL_DEVICETREE}" ]; then
		dtbcount=1
		for DTB in ${KERNEL_DEVICETREE}; do
			if echo ${DTB} | grep -q '/dts/'; then
				bbwarn "${DTB} contains the full path to the the dts file, but only the dtb name should be used."
				DTB=`basename ${DTB} | sed 's,\.dts$,.dtb,g'`
			fi
			DTB_PATH="arch/${ARCH}/boot/dts/${DTB}"
			if [ ! -e "${DTB_PATH}" ]; then
				DTB_PATH="arch/${ARCH}/boot/${DTB}"
			fi

			DTB=$(echo "${DTB}" | tr '/' '_')
			DTBS="${DTBS} ${DTB}"
			fitimage_emit_section_dtb ${1} ${DTB} ${DTB_PATH}
		done
	fi

	if [ -n "${EXTERNAL_KERNEL_DEVICETREE}" ]; then
		dtbcount=1
		for DTB in $(find "${EXTERNAL_KERNEL_DEVICETREE}" \( -name '*.dtb' -o -name '*.dtbo' \) -printf '%P\n' | sort); do
			DTB=$(echo "${DTB}" | tr '/' '_')
			DTBS="${DTBS} ${DTB}"
			fitimage_emit_section_dtb ${1} ${DTB} "${EXTERNAL_KERNEL_DEVICETREE}/${DTB}"
		done
	fi

	#
	# Step 3: Prepare a setup section. (For x86)
	#
	if [ -e arch/${ARCH}/boot/setup.bin ]; then
		setupcount=1
		fitimage_emit_section_setup ${1} "${setupcount}" arch/${ARCH}/boot/setup.bin
	fi

	#
	# Step 4: Prepare a ramdisk section.
	#
	if [ "x${ramdiskcount}" = "x1" ] ; then
		# Find and use the first initramfs image archive type we find
		for img in cpio.lz4 cpio.lzo cpio.lzma cpio.xz cpio.gz ext2.gz cpio; do
			initramfs_path="${DEPLOY_DIR_IMAGE}/${INITRAMFS_IMAGE_NAME}.${img}"
			echo "Using $initramfs_path"
			if [ -e "${initramfs_path}" ]; then
				fitimage_emit_section_ramdisk ${1} "${ramdiskcount}" "${initramfs_path}"
				break
			fi
		done
	fi

	fitimage_emit_section_maint ${1} sectend

	# Force the first Kernel and DTB in the default config
	kernelcount=1
	if [ -n "${dtbcount}" ]; then
		dtbcount=1
	fi

	#
	# Step 5: Prepare a configurations section
	#
	fitimage_emit_section_maint ${1} confstart

	# kernel-fitimage.bbclass currently only supports a single kernel (no less or
	# more) to be added to the FIT image along with 0 or more device trees and
	# 0 or 1 ramdisk.
	# If a device tree is to be part of the FIT image, then select
	# the default configuration to be used is based on the dtbcount. If there is
	# no dtb present than select the default configuation to be based on
	# the kernelcount.
	if [ -n "${DTBS}" ]; then
		i=1
		for DTB in ${DTBS}; do
			dtb_ext=${DTB##*.}
			if [ "${dtb_ext}" = "dtbo" ]; then
				fitimage_emit_section_config ${1} "" "${DTB}" "" "" "`expr ${i} = ${dtbcount}`"
			else
				fitimage_emit_section_config ${1} "${kernelcount}" "${DTB}" "${ramdiskcount}" "${setupcount}" "`expr ${i} = ${dtbcount}`"
			fi
			i=`expr ${i} + 1`
		done
	else
		defaultconfigcount=1
		fitimage_emit_section_config ${1} "${kernelcount}" "" "${ramdiskcount}" "${setupcount}" "${defaultconfigcount}"
	fi

	fitimage_emit_section_maint ${1} sectend

	fitimage_emit_section_maint ${1} fitend

	#
	# Step 6: Assemble the image
	#
	uboot-mkimage \
		${@'-D "${UBOOT_MKIMAGE_DTCOPTS}"' if len('${UBOOT_MKIMAGE_DTCOPTS}') else ''} \
		-f ${1} \
		arch/${ARCH}/boot/${2}

	#
	# Step 7: Sign the image and add public key to U-Boot dtb
	#
	if [ "x${UBOOT_SIGN_ENABLE}" = "x1" ] ; then
		add_key_to_u_boot=""
		if [ -n "${UBOOT_DTB_BINARY}" ]; then
			# The u-boot.dtb is a symlink to UBOOT_DTB_IMAGE, so we need copy
			# both of them, and don't dereference the symlink.
			cp -P ${STAGING_DATADIR}/u-boot*.dtb ${B}
			add_key_to_u_boot="-K ${B}/${UBOOT_DTB_BINARY}"
		fi
		uboot-mkimage \
			${@'-D "${UBOOT_MKIMAGE_DTCOPTS}"' if len('${UBOOT_MKIMAGE_DTCOPTS}') else ''} \
			-F -k "${UBOOT_SIGN_KEYDIR}" \
			$add_key_to_u_boot \
			-r arch/${ARCH}/boot/${2}
	fi
}

do_assemble_fitimage() {
	if echo ${KERNEL_IMAGETYPES} | grep -wq "fitImage"; then
		cd ${B}
		fitimage_assemble fit-image.its fitImage
	fi
}

addtask assemble_fitimage before do_install after do_compile

do_assemble_fitimage_initramfs() {
	if echo ${KERNEL_IMAGETYPES} | grep -wq "fitImage" && \
		test -n "${INITRAMFS_IMAGE}" ; then
		cd ${B}
		fitimage_assemble fit-image-${INITRAMFS_IMAGE}.its fitImage-${INITRAMFS_IMAGE} 1
	fi
}

addtask assemble_fitimage_initramfs before do_deploy after do_bundle_initramfs

do_generate_rsa_keys() {
	if [ "${UBOOT_SIGN_ENABLE}" = "0" ] && [ "${FIT_GENERATE_KEYS}" = "1" ]; then
		bbwarn "FIT_GENERATE_KEYS is set to 1 eventhough UBOOT_SIGN_ENABLE is set to 0. The keys will not be generated as they won't be used."
	fi

	if [ "${UBOOT_SIGN_ENABLE}" = "1" ] && [ "${FIT_GENERATE_KEYS}" = "1" ]; then

		# Generate keys only if they don't already exist
		if [ ! -f "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".key ] || \
			[ ! -f "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".crt]; then

			# make directory if it does not already exist
			mkdir -p "${UBOOT_SIGN_KEYDIR}"

			echo "Generating RSA private key for signing fitImage"
			openssl genrsa ${FIT_KEY_GENRSA_ARGS} -out \
				"${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".key \
				"${FIT_SIGN_NUMBITS}"

			echo "Generating certificate for signing fitImage"
			openssl req ${FIT_KEY_REQ_ARGS} "${FIT_KEY_SIGN_PKCS}" \
				-key "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".key \
				-out "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".crt
		fi
	fi
}

addtask generate_rsa_keys before do_assemble_fitimage after do_compile

kernel_do_deploy[vardepsexclude] = "DATETIME"
kernel_do_deploy_append() {
	# Update deploy directory
	if echo ${KERNEL_IMAGETYPES} | grep -wq "fitImage"; then
		echo "Copying fit-image.its source file..."
		install -m 0644 ${B}/fit-image.its "$deployDir/fitImage-its-${KERNEL_FIT_NAME}.its"
		ln -snf fitImage-its-${KERNEL_FIT_NAME}.its "$deployDir/fitImage-its-${KERNEL_FIT_LINK_NAME}"

		echo "Copying linux.bin file..."
		install -m 0644 ${B}/linux.bin $deployDir/fitImage-linux.bin-${KERNEL_FIT_NAME}.bin
		ln -snf fitImage-linux.bin-${KERNEL_FIT_NAME}.bin "$deployDir/fitImage-linux.bin-${KERNEL_FIT_LINK_NAME}"

		if [ -n "${INITRAMFS_IMAGE}" ]; then
			echo "Copying fit-image-${INITRAMFS_IMAGE}.its source file..."
			install -m 0644 ${B}/fit-image-${INITRAMFS_IMAGE}.its "$deployDir/fitImage-its-${INITRAMFS_IMAGE_NAME}-${KERNEL_FIT_NAME}.its"
			ln -snf fitImage-its-${INITRAMFS_IMAGE_NAME}-${KERNEL_FIT_NAME}.its "$deployDir/fitImage-its-${INITRAMFS_IMAGE_NAME}-${KERNEL_FIT_LINK_NAME}"

			echo "Copying fitImage-${INITRAMFS_IMAGE} file..."
			install -m 0644 ${B}/arch/${ARCH}/boot/fitImage-${INITRAMFS_IMAGE} "$deployDir/fitImage-${INITRAMFS_IMAGE_NAME}-${KERNEL_FIT_NAME}.bin"
			ln -snf fitImage-${INITRAMFS_IMAGE_NAME}-${KERNEL_FIT_NAME}.bin "$deployDir/fitImage-${INITRAMFS_IMAGE_NAME}-${KERNEL_FIT_LINK_NAME}"
		fi
		if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_BINARY}" ] ; then
			# UBOOT_DTB_IMAGE is a realfile, but we can't use
			# ${UBOOT_DTB_IMAGE} since it contains ${PV} which is aimed
			# for u-boot, but we are in kernel env now.
			install -m 0644 ${B}/u-boot-${MACHINE}*.dtb "$deployDir/"
		fi
	fi
}