poky/meta/classes-recipe/kernel.bbclass

#
# Copyright OpenEmbedded Contributors
#
# SPDX-License-Identifier: MIT
#

inherit linux-kernel-base kernel-module-split

COMPATIBLE_HOST = ".*-linux"

KERNEL_PACKAGE_NAME ??= "kernel"
KERNEL_DEPLOYSUBDIR ??= "${@ "" if (d.getVar("KERNEL_PACKAGE_NAME") == "kernel") else d.getVar("KERNEL_PACKAGE_NAME") }"

PROVIDES += "virtual/kernel"
DEPENDS += "virtual/${TARGET_PREFIX}binutils virtual/${TARGET_PREFIX}gcc kmod-native bc-native bison-native"
DEPENDS += "${@bb.utils.contains("INITRAMFS_FSTYPES", "cpio.lzo", "lzop-native", "", d)}"
DEPENDS += "${@bb.utils.contains("INITRAMFS_FSTYPES", "cpio.lz4", "lz4-native", "", d)}"
DEPENDS += "${@bb.utils.contains("INITRAMFS_FSTYPES", "cpio.zst", "zstd-native", "", d)}"
PACKAGE_WRITE_DEPS += "depmodwrapper-cross"

do_deploy[depends] += "depmodwrapper-cross:do_populate_sysroot gzip-native:do_populate_sysroot"
do_clean[depends] += "make-mod-scripts:do_clean"

CVE_PRODUCT ?= "linux_kernel"

S = "${STAGING_KERNEL_DIR}"
B = "${WORKDIR}/build"
KBUILD_OUTPUT = "${B}"
OE_TERMINAL_EXPORTS += "KBUILD_OUTPUT"

# we include gcc above, we dont need virtual/libc
INHIBIT_DEFAULT_DEPS = "1"

KERNEL_IMAGETYPE ?= "zImage"
INITRAMFS_IMAGE ?= ""
INITRAMFS_TASK ?= ""
INITRAMFS_IMAGE_BUNDLE ?= ""
INITRAMFS_DEPLOY_DIR_IMAGE ?= "${DEPLOY_DIR_IMAGE}"
INITRAMFS_MULTICONFIG ?= ""

# KERNEL_VERSION is extracted from source code. It is evaluated as
# None for the first parsing, since the code has not been fetched.
# After the code is fetched, it will be evaluated as real version
# number and cause kernel to be rebuilt. To avoid this, make
# KERNEL_VERSION_NAME and KERNEL_VERSION_PKG_NAME depend on
# LINUX_VERSION which is a constant.
KERNEL_VERSION_NAME = "${@d.getVar('KERNEL_VERSION') or ""}"
KERNEL_VERSION_NAME[vardepvalue] = "${LINUX_VERSION}"
KERNEL_VERSION_PKG_NAME = "${@legitimize_package_name(d.getVar('KERNEL_VERSION'))}"
KERNEL_VERSION_PKG_NAME[vardepvalue] = "${LINUX_VERSION}"

python __anonymous () {
    pn = d.getVar("PN")
    kpn = d.getVar("KERNEL_PACKAGE_NAME")

    # XXX Remove this after bug 11905 is resolved
    #  FILES:${KERNEL_PACKAGE_NAME}-dev doesn't expand correctly
    if kpn == pn:
        bb.warn("Some packages (E.g. *-dev) might be missing due to "
                "bug 11905 (variable KERNEL_PACKAGE_NAME == PN)")

    # The default kernel recipe builds in a shared location defined by
    # bitbake/distro confs: STAGING_KERNEL_DIR and STAGING_KERNEL_BUILDDIR.
    # Set these variables to directories under ${WORKDIR} in alternate
    # kernel recipes (I.e. where KERNEL_PACKAGE_NAME != kernel) so that they
    # may build in parallel with the default kernel without clobbering.
    if kpn != "kernel":
        workdir = d.getVar("WORKDIR")
        sourceDir = os.path.join(workdir, 'kernel-source')
        artifactsDir = os.path.join(workdir, 'kernel-build-artifacts')
        d.setVar("STAGING_KERNEL_DIR", sourceDir)
        d.setVar("STAGING_KERNEL_BUILDDIR", artifactsDir)

    # Merge KERNEL_IMAGETYPE and KERNEL_ALT_IMAGETYPE into KERNEL_IMAGETYPES
    type = d.getVar('KERNEL_IMAGETYPE') or ""
    alttype = d.getVar('KERNEL_ALT_IMAGETYPE') or ""
    types = d.getVar('KERNEL_IMAGETYPES') or ""
    if type not in types.split():
        types = (type + ' ' + types).strip()
    if alttype not in types.split():
        types = (alttype + ' ' + types).strip()
    d.setVar('KERNEL_IMAGETYPES', types)

    # KERNEL_IMAGETYPES may contain a mixture of image types supported directly
    # by the kernel build system and types which are created by post-processing
    # the output of the kernel build system (e.g. compressing vmlinux ->
    # vmlinux.gz in kernel_do_transform_kernel()).
    # KERNEL_IMAGETYPE_FOR_MAKE should contain only image types supported
    # directly by the kernel build system.
    if not d.getVar('KERNEL_IMAGETYPE_FOR_MAKE'):
        typeformake = set()
        for type in types.split():
            if type == 'vmlinux.gz':
                type = 'vmlinux'
            typeformake.add(type)

        d.setVar('KERNEL_IMAGETYPE_FOR_MAKE', ' '.join(sorted(typeformake)))

    kname = d.getVar('KERNEL_PACKAGE_NAME') or "kernel"
    imagedest = d.getVar('KERNEL_IMAGEDEST')

    for type in types.split():
        if bb.data.inherits_class('nopackages', d):
            continue
        typelower = type.lower()
        d.appendVar('PACKAGES', ' %s-image-%s' % (kname, typelower))
        d.setVar('FILES:' + kname + '-image-' + typelower, '/' + imagedest + '/' + type + '-${KERNEL_VERSION_NAME}' + ' /' + imagedest + '/' + type)
        d.appendVar('RDEPENDS:%s-image' % kname, ' %s-image-%s (= ${EXTENDPKGV})' % (kname, typelower))
        splitmods = d.getVar("KERNEL_SPLIT_MODULES")
        if splitmods != '1':
            d.appendVar('RDEPENDS:%s-image' % kname, ' %s-modules (= ${EXTENDPKGV})' % kname)
            d.appendVar('RDEPENDS:%s-image-%s' % (kname, typelower), ' %s-modules-${KERNEL_VERSION_PKG_NAME} (= ${EXTENDPKGV})' % kname)
            d.setVar('PKG:%s-modules' % kname, '%s-modules-${KERNEL_VERSION_PKG_NAME}' % kname)
            d.appendVar('RPROVIDES:%s-modules' % kname, '%s-modules-${KERNEL_VERSION_PKG_NAME}' % kname)

        d.setVar('PKG:%s-image-%s' % (kname,typelower), '%s-image-%s-${KERNEL_VERSION_PKG_NAME}' % (kname, typelower))
        d.setVar('ALLOW_EMPTY:%s-image-%s' % (kname, typelower), '1')
        d.prependVar('pkg_postinst:%s-image-%s' % (kname,typelower), """set +e
if [ -n "$D" ]; then
    ln -sf %s-${KERNEL_VERSION} $D/${KERNEL_IMAGEDEST}/%s > /dev/null 2>&1
else
    ln -sf %s-${KERNEL_VERSION} ${KERNEL_IMAGEDEST}/%s > /dev/null 2>&1
    if [ $? -ne 0 ]; then
        echo "Filesystem on ${KERNEL_IMAGEDEST}/ doesn't support symlinks, falling back to copied image (%s)."
        install -m 0644 ${KERNEL_IMAGEDEST}/%s-${KERNEL_VERSION} ${KERNEL_IMAGEDEST}/%s
    fi
fi
set -e
""" % (type, type, type, type, type, type, type))
        d.setVar('pkg_postrm:%s-image-%s' % (kname,typelower), """set +e
if [ -f "${KERNEL_IMAGEDEST}/%s" -o -L "${KERNEL_IMAGEDEST}/%s" ]; then
    rm -f ${KERNEL_IMAGEDEST}/%s  > /dev/null 2>&1
fi
set -e
""" % (type, type, type))


    image = d.getVar('INITRAMFS_IMAGE')
    # If the INTIRAMFS_IMAGE is set but the INITRAMFS_IMAGE_BUNDLE is set to 0,
    # the do_bundle_initramfs does nothing, but the INITRAMFS_IMAGE is built
    # standalone for use by wic and other tools.
    if image:
        if d.getVar('INITRAMFS_MULTICONFIG'):
            d.appendVarFlag('do_bundle_initramfs', 'mcdepends', ' mc::${INITRAMFS_MULTICONFIG}:${INITRAMFS_IMAGE}:do_image_complete')
        else:
            d.appendVarFlag('do_bundle_initramfs', 'depends', ' ${INITRAMFS_IMAGE}:do_image_complete')
    if image and bb.utils.to_boolean(d.getVar('INITRAMFS_IMAGE_BUNDLE')):
        bb.build.addtask('do_transform_bundled_initramfs', 'do_deploy', 'do_bundle_initramfs', d)

    # NOTE: setting INITRAMFS_TASK is for backward compatibility
    #       The preferred method is to set INITRAMFS_IMAGE, because
    #       this INITRAMFS_TASK has circular dependency problems
    #       if the initramfs requires kernel modules
    image_task = d.getVar('INITRAMFS_TASK')
    if image_task:
        d.appendVarFlag('do_configure', 'depends', ' ${INITRAMFS_TASK}')
}

# Here we pull in all various kernel image types which we support.
#
# In case you're wondering why kernel.bbclass inherits the other image
# types instead of the other way around, the reason for that is to
# maintain compatibility with various currently existing meta-layers.
# By pulling in the various kernel image types here, we retain the
# original behavior of kernel.bbclass, so no meta-layers should get
# broken.
#
# KERNEL_CLASSES by default pulls in kernel-uimage.bbclass, since this
# used to be the default behavior when only uImage was supported. This
# variable can be appended by users who implement support for new kernel
# image types.

KERNEL_CLASSES ?= " kernel-uimage "
inherit ${KERNEL_CLASSES}

# Old style kernels may set ${S} = ${WORKDIR}/git for example
# We need to move these over to STAGING_KERNEL_DIR. We can't just
# create the symlink in advance as the git fetcher can't cope with
# the symlink.
do_unpack[cleandirs] += " ${S} ${STAGING_KERNEL_DIR} ${B} ${STAGING_KERNEL_BUILDDIR}"
do_clean[cleandirs] += " ${S} ${STAGING_KERNEL_DIR} ${B} ${STAGING_KERNEL_BUILDDIR}"
python do_symlink_kernsrc () {
    s = d.getVar("S")
    if s[-1] == '/':
        # drop trailing slash, so that os.symlink(kernsrc, s) doesn't use s as directory name and fail
        s=s[:-1]
    kernsrc = d.getVar("STAGING_KERNEL_DIR")
    if s != kernsrc:
        bb.utils.mkdirhier(kernsrc)
        bb.utils.remove(kernsrc, recurse=True)
        if d.getVar("EXTERNALSRC"):
            # With EXTERNALSRC S will not be wiped so we can symlink to it
            os.symlink(s, kernsrc)
        else:
            import shutil
            shutil.move(s, kernsrc)
            os.symlink(kernsrc, s)
}
# do_patch is normally ordered before do_configure, but
# externalsrc.bbclass deletes do_patch, breaking the dependency of
# do_configure on do_symlink_kernsrc.
addtask symlink_kernsrc before do_patch do_configure after do_unpack

inherit kernel-arch deploy

PACKAGES_DYNAMIC += "^${KERNEL_PACKAGE_NAME}-module-.*"
PACKAGES_DYNAMIC += "^${KERNEL_PACKAGE_NAME}-image-.*"
PACKAGES_DYNAMIC += "^${KERNEL_PACKAGE_NAME}-firmware-.*"

export OS = "${TARGET_OS}"
export CROSS_COMPILE = "${TARGET_PREFIX}"

KERNEL_RELEASE ?= "${KERNEL_VERSION}"

# The directory where built kernel lies in the kernel tree
KERNEL_OUTPUT_DIR ?= "arch/${ARCH}/boot"
KERNEL_IMAGEDEST ?= "boot"
KERNEL_DTBDEST ?= "${KERNEL_IMAGEDEST}"
KERNEL_DTBVENDORED ?= "0"

#
# configuration
#
export CMDLINE_CONSOLE = "console=${@d.getVar("KERNEL_CONSOLE") or "ttyS0"}"

KERNEL_VERSION = "${@get_kernelversion_headers('${B}')}"

# kernels are generally machine specific
PACKAGE_ARCH = "${MACHINE_ARCH}"

# U-Boot support
UBOOT_ENTRYPOINT ?= "20008000"
UBOOT_LOADADDRESS ?= "${UBOOT_ENTRYPOINT}"

# Some Linux kernel configurations need additional parameters on the command line
KERNEL_EXTRA_ARGS ?= ""

EXTRA_OEMAKE += ' CC="${KERNEL_CC}" LD="${KERNEL_LD}" OBJCOPY="${KERNEL_OBJCOPY}"'
EXTRA_OEMAKE += ' HOSTCC="${BUILD_CC}" HOSTCFLAGS="${BUILD_CFLAGS}" HOSTLDFLAGS="${BUILD_LDFLAGS}" HOSTCPP="${BUILD_CPP}"'
EXTRA_OEMAKE += ' HOSTCXX="${BUILD_CXX}" HOSTCXXFLAGS="${BUILD_CXXFLAGS}"'

KERNEL_ALT_IMAGETYPE ??= ""

copy_initramfs() {
	echo "Copying initramfs into ./usr ..."
	# In case the directory is not created yet from the first pass compile:
	mkdir -p ${B}/usr
	# Find and use the first initramfs image archive type we find
	rm -f ${B}/usr/${INITRAMFS_IMAGE_NAME}.cpio
	for img in cpio cpio.gz cpio.lz4 cpio.lzo cpio.lzma cpio.xz cpio.zst; do
		if [ -e "${INITRAMFS_DEPLOY_DIR_IMAGE}/${INITRAMFS_IMAGE_NAME}.$img" ]; then
			cp ${INITRAMFS_DEPLOY_DIR_IMAGE}/${INITRAMFS_IMAGE_NAME}.$img ${B}/usr/.
			case $img in
			*gz)
				echo "gzip decompressing image"
				gunzip -f ${B}/usr/${INITRAMFS_IMAGE_NAME}.$img
				break
				;;
			*lz4)
				echo "lz4 decompressing image"
				lz4 -df ${B}/usr/${INITRAMFS_IMAGE_NAME}.$img ${B}/usr/${INITRAMFS_IMAGE_NAME}.cpio
				break
				;;
			*lzo)
				echo "lzo decompressing image"
				lzop -df ${B}/usr/${INITRAMFS_IMAGE_NAME}.$img
				break
				;;
			*lzma)
				echo "lzma decompressing image"
				lzma -df ${B}/usr/${INITRAMFS_IMAGE_NAME}.$img
				break
				;;
			*xz)
				echo "xz decompressing image"
				xz -df ${B}/usr/${INITRAMFS_IMAGE_NAME}.$img
				break
				;;
			*zst)
				echo "zst decompressing image"
				zstd -df ${B}/usr/${INITRAMFS_IMAGE_NAME}.$img
				break
				;;
			esac
			break
		fi
	done
	# Verify that the above loop found a initramfs, fail otherwise
	[ -f ${B}/usr/${INITRAMFS_IMAGE_NAME}.cpio ] && echo "Finished copy of initramfs into ./usr" || die "Could not find any ${INITRAMFS_DEPLOY_DIR_IMAGE}/${INITRAMFS_IMAGE_NAME}.cpio{.gz|.lz4|.lzo|.lzma|.xz|.zst) for bundling; INITRAMFS_IMAGE_NAME might be wrong."
}

do_bundle_initramfs () {
	if [ ! -z "${INITRAMFS_IMAGE}" -a x"${INITRAMFS_IMAGE_BUNDLE}" = x1 ]; then
		echo "Creating a kernel image with a bundled initramfs..."
		copy_initramfs
		# Backing up kernel image relies on its type(regular file or symbolic link)
		tmp_path=""
		for imageType in ${KERNEL_IMAGETYPE_FOR_MAKE} ; do
			if [ -h ${KERNEL_OUTPUT_DIR}/$imageType ] ; then
				linkpath=`readlink -n ${KERNEL_OUTPUT_DIR}/$imageType`
				realpath=`readlink -fn ${KERNEL_OUTPUT_DIR}/$imageType`
				mv -f $realpath $realpath.bak
				tmp_path=$tmp_path" "$imageType"#"$linkpath"#"$realpath
			elif [ -f ${KERNEL_OUTPUT_DIR}/$imageType ]; then
				mv -f ${KERNEL_OUTPUT_DIR}/$imageType ${KERNEL_OUTPUT_DIR}/$imageType.bak
				tmp_path=$tmp_path" "$imageType"##"
			fi
		done
		use_alternate_initrd=CONFIG_INITRAMFS_SOURCE=${B}/usr/${INITRAMFS_IMAGE_NAME}.cpio
		kernel_do_compile
		# Restoring kernel image
		for tp in $tmp_path ; do
			imageType=`echo $tp|cut -d "#" -f 1`
			linkpath=`echo $tp|cut -d "#" -f 2`
			realpath=`echo $tp|cut -d "#" -f 3`
			if [ -n "$realpath" ]; then
				mv -f $realpath $realpath.initramfs
				mv -f $realpath.bak $realpath
				ln -sf $linkpath.initramfs ${B}/${KERNEL_OUTPUT_DIR}/$imageType.initramfs
			else
				mv -f ${KERNEL_OUTPUT_DIR}/$imageType ${KERNEL_OUTPUT_DIR}/$imageType.initramfs
				mv -f ${KERNEL_OUTPUT_DIR}/$imageType.bak ${KERNEL_OUTPUT_DIR}/$imageType
			fi
		done
	fi
}
do_bundle_initramfs[dirs] = "${B}"

kernel_do_transform_bundled_initramfs() {
        # vmlinux.gz is not built by kernel
	if (echo "${KERNEL_IMAGETYPES}" | grep -wq "vmlinux\.gz"); then
		gzip -9cn < ${KERNEL_OUTPUT_DIR}/vmlinux.initramfs > ${KERNEL_OUTPUT_DIR}/vmlinux.gz.initramfs
        fi
}
do_transform_bundled_initramfs[dirs] = "${B}"

python do_devshell:prepend () {
    os.environ["LDFLAGS"] = ''
}

addtask bundle_initramfs after do_install before do_deploy

KERNEL_DEBUG_TIMESTAMPS ??= "0"

kernel_do_compile() {
	unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS MACHINE

	# setup native pkg-config variables (kconfig scripts call pkg-config directly, cannot generically be overriden to pkg-config-native)
	export PKG_CONFIG_DIR="${STAGING_DIR_NATIVE}${libdir_native}/pkgconfig"
	export PKG_CONFIG_PATH="$PKG_CONFIG_DIR:${STAGING_DATADIR_NATIVE}/pkgconfig"
	export PKG_CONFIG_LIBDIR="$PKG_CONFIG_DIR"
	export PKG_CONFIG_SYSROOT_DIR=""

	if [ "${KERNEL_DEBUG_TIMESTAMPS}" != "1" ]; then
		# kernel sources do not use do_unpack, so SOURCE_DATE_EPOCH may not
		# be set....
		if [ "${SOURCE_DATE_EPOCH}" = "" -o "${SOURCE_DATE_EPOCH}" = "0" ]; then
			# The source directory is not necessarily a git repository, so we
			# specify the git-dir to ensure that git does not query a
			# repository in any parent directory.
			SOURCE_DATE_EPOCH=`git --git-dir="${S}/.git" log -1 --pretty=%ct 2>/dev/null || echo "${REPRODUCIBLE_TIMESTAMP_ROOTFS}"`
		fi

		ts=`LC_ALL=C date -d @$SOURCE_DATE_EPOCH`
		export KBUILD_BUILD_TIMESTAMP="$ts"
		export KCONFIG_NOTIMESTAMP=1
		bbnote "KBUILD_BUILD_TIMESTAMP: $ts"
	else
		ts=`LC_ALL=C date`
		export KBUILD_BUILD_TIMESTAMP="$ts"
		bbnote "KBUILD_BUILD_TIMESTAMP: $ts"
	fi
	# The $use_alternate_initrd is only set from
	# do_bundle_initramfs() This variable is specifically for the
	# case where we are making a second pass at the kernel
	# compilation and we want to force the kernel build to use a
	# different initramfs image.  The way to do that in the kernel
	# is to specify:
	# make ...args... CONFIG_INITRAMFS_SOURCE=some_other_initramfs.cpio
	if [ "$use_alternate_initrd" = "" ] && [ "${INITRAMFS_TASK}" != "" ] ; then
		# The old style way of copying an prebuilt image and building it
		# is turned on via INTIRAMFS_TASK != ""
		copy_initramfs
		use_alternate_initrd=CONFIG_INITRAMFS_SOURCE=${B}/usr/${INITRAMFS_IMAGE_NAME}.cpio
	fi
	for typeformake in ${KERNEL_IMAGETYPE_FOR_MAKE} ; do
		oe_runmake ${PARALLEL_MAKE} ${typeformake} ${KERNEL_EXTRA_ARGS} $use_alternate_initrd
	done
}

kernel_do_transform_kernel() {
	# vmlinux.gz is not built by kernel
	if (echo "${KERNEL_IMAGETYPES}" | grep -wq "vmlinux\.gz"); then
		mkdir -p "${KERNEL_OUTPUT_DIR}"
		gzip -9cn < ${B}/vmlinux > "${KERNEL_OUTPUT_DIR}/vmlinux.gz"
	fi
}
do_transform_kernel[dirs] = "${B}"
addtask transform_kernel after do_compile before do_install

do_compile_kernelmodules() {
	unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS MACHINE
	if [ "${KERNEL_DEBUG_TIMESTAMPS}" != "1" ]; then
		# kernel sources do not use do_unpack, so SOURCE_DATE_EPOCH may not
		# be set....
		if [ "${SOURCE_DATE_EPOCH}" = "" -o "${SOURCE_DATE_EPOCH}" = "0" ]; then
			# The source directory is not necessarily a git repository, so we
			# specify the git-dir to ensure that git does not query a
			# repository in any parent directory.
			SOURCE_DATE_EPOCH=`git --git-dir="${S}/.git" log -1 --pretty=%ct 2>/dev/null || echo "${REPRODUCIBLE_TIMESTAMP_ROOTFS}"`
		fi

		ts=`LC_ALL=C date -d @$SOURCE_DATE_EPOCH`
		export KBUILD_BUILD_TIMESTAMP="$ts"
		export KCONFIG_NOTIMESTAMP=1
		bbnote "KBUILD_BUILD_TIMESTAMP: $ts"
	else
		ts=`LC_ALL=C date`
		export KBUILD_BUILD_TIMESTAMP="$ts"
		bbnote "KBUILD_BUILD_TIMESTAMP: $ts"
	fi
	if (grep -q -i -e '^CONFIG_MODULES=y$' ${B}/.config); then
		oe_runmake -C ${B} ${PARALLEL_MAKE} modules ${KERNEL_EXTRA_ARGS}

		# Module.symvers gets updated during the 
		# building of the kernel modules. We need to
		# update this in the shared workdir since some
		# external kernel modules has a dependency on
		# other kernel modules and will look at this
		# file to do symbol lookups
		cp ${B}/Module.symvers ${STAGING_KERNEL_BUILDDIR}/
		# 5.10+ kernels have module.lds that we need to copy for external module builds
		if [ -e "${B}/scripts/module.lds" ]; then
			install -Dm 0644 ${B}/scripts/module.lds ${STAGING_KERNEL_BUILDDIR}/scripts/module.lds
		fi
	else
		bbnote "no modules to compile"
	fi
}
addtask compile_kernelmodules after do_compile before do_strip

kernel_do_install() {
	#
	# First install the modules
	#
	unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS MACHINE
	if (grep -q -i -e '^CONFIG_MODULES=y$' .config); then
		oe_runmake DEPMOD=echo MODLIB=${D}${nonarch_base_libdir}/modules/${KERNEL_VERSION} INSTALL_FW_PATH=${D}${nonarch_base_libdir}/firmware modules_install
		rm "${D}${nonarch_base_libdir}/modules/${KERNEL_VERSION}/build"
		rm "${D}${nonarch_base_libdir}/modules/${KERNEL_VERSION}/source"
		# Remove empty module directories to prevent QA issues
		find "${D}${nonarch_base_libdir}/modules/${KERNEL_VERSION}/kernel" -type d -empty -delete
	else
		bbnote "no modules to install"
	fi

	#
	# Install various kernel output (zImage, map file, config, module support files)
	#
	install -d ${D}/${KERNEL_IMAGEDEST}

	#
	# When including an initramfs bundle inside a FIT image, the fitImage is created after the install task
	# by do_assemble_fitimage_initramfs.
	# This happens after the generation of the initramfs bundle (done by do_bundle_initramfs).
	# So, at the level of the install task we should not try to install the fitImage. fitImage is still not
	# generated yet.
	# After the generation of the fitImage, the deploy task copies the fitImage from the build directory to
	# the deploy folder.
	#

	for imageType in ${KERNEL_IMAGETYPES} ; do
		if [ $imageType != "fitImage" ] || [ "${INITRAMFS_IMAGE_BUNDLE}" != "1" ] ; then
			install -m 0644 ${KERNEL_OUTPUT_DIR}/$imageType ${D}/${KERNEL_IMAGEDEST}/$imageType-${KERNEL_VERSION}
		fi
	done

	install -m 0644 System.map ${D}/${KERNEL_IMAGEDEST}/System.map-${KERNEL_VERSION}
	install -m 0644 .config ${D}/${KERNEL_IMAGEDEST}/config-${KERNEL_VERSION}
	install -m 0644 vmlinux ${D}/${KERNEL_IMAGEDEST}/vmlinux-${KERNEL_VERSION}
	[ -e Module.symvers ] && install -m 0644 Module.symvers ${D}/${KERNEL_IMAGEDEST}/Module.symvers-${KERNEL_VERSION}
	install -d ${D}${sysconfdir}/modules-load.d
	install -d ${D}${sysconfdir}/modprobe.d
}

# Must be ran no earlier than after do_kernel_checkout or else Makefile won't be in ${S}/Makefile
do_kernel_version_sanity_check() {
	if [ "x${KERNEL_VERSION_SANITY_SKIP}" = "x1" ]; then
		exit 0
	fi

	# The Makefile determines the kernel version shown at runtime
	# Don't use KERNEL_VERSION because the headers it grabs the version from aren't generated until do_compile
	VERSION=$(grep "^VERSION =" ${S}/Makefile | sed s/.*=\ *//)
	PATCHLEVEL=$(grep "^PATCHLEVEL =" ${S}/Makefile | sed s/.*=\ *//)
	SUBLEVEL=$(grep "^SUBLEVEL =" ${S}/Makefile | sed s/.*=\ *//)
	EXTRAVERSION=$(grep "^EXTRAVERSION =" ${S}/Makefile | sed s/.*=\ *//)

	# Build a string for regex and a plain version string
	reg="^${VERSION}\.${PATCHLEVEL}"
	vers="${VERSION}.${PATCHLEVEL}"
	if [ -n "${SUBLEVEL}" ]; then
		# Ignoring a SUBLEVEL of zero is fine
		if [ "${SUBLEVEL}" = "0" ]; then
			reg="${reg}(\.${SUBLEVEL})?"
		else
			reg="${reg}\.${SUBLEVEL}"
			vers="${vers}.${SUBLEVEL}"
		fi
	fi
	vers="${vers}${EXTRAVERSION}"
	reg="${reg}${EXTRAVERSION}"

	if [ -z `echo ${PV} | grep -E "${reg}"` ]; then
		bbfatal "Package Version (${PV}) does not match of kernel being built (${vers}). Please update the PV variable to match the kernel source or set KERNEL_VERSION_SANITY_SKIP=\"1\" in your recipe."
	fi
	exit 0
}

addtask shared_workdir after do_compile before do_compile_kernelmodules
addtask shared_workdir_setscene

do_shared_workdir_setscene () {
	exit 1
}

emit_depmod_pkgdata() {
	# Stash data for depmod
	install -d ${PKGDESTWORK}/${KERNEL_PACKAGE_NAME}-depmod/
	echo "${KERNEL_VERSION}" > ${PKGDESTWORK}/${KERNEL_PACKAGE_NAME}-depmod/${KERNEL_PACKAGE_NAME}-abiversion
	cp ${B}/System.map ${PKGDESTWORK}/${KERNEL_PACKAGE_NAME}-depmod/System.map-${KERNEL_VERSION}
}

PACKAGEFUNCS += "emit_depmod_pkgdata"

do_shared_workdir[cleandirs] += " ${STAGING_KERNEL_BUILDDIR}"
do_shared_workdir () {
	cd ${B}

	kerneldir=${STAGING_KERNEL_BUILDDIR}
	install -d $kerneldir

	#
	# Store the kernel version in sysroots for module-base.bbclass
	#

	echo "${KERNEL_VERSION}" > $kerneldir/${KERNEL_PACKAGE_NAME}-abiversion

	# Copy files required for module builds
	cp System.map $kerneldir/System.map-${KERNEL_VERSION}
	[ -e Module.symvers ] && cp Module.symvers $kerneldir/
	cp .config $kerneldir/
	mkdir -p $kerneldir/include/config
	cp include/config/kernel.release $kerneldir/include/config/kernel.release
	if [ -e certs/signing_key.x509 ]; then
		# The signing_key.* files are stored in the certs/ dir in
		# newer Linux kernels
		mkdir -p $kerneldir/certs
		cp certs/signing_key.* $kerneldir/certs/
	elif [ -e signing_key.priv ]; then
		cp signing_key.* $kerneldir/
	fi

	# We can also copy over all the generated files and avoid special cases
	# like version.h, but we've opted to keep this small until file creep starts
	# to happen
	if [ -e include/linux/version.h ]; then
		mkdir -p $kerneldir/include/linux
		cp include/linux/version.h $kerneldir/include/linux/version.h
	fi

	# As of Linux kernel version 3.0.1, the clean target removes
	# arch/powerpc/lib/crtsavres.o which is present in
	# KBUILD_LDFLAGS_MODULE, making it required to build external modules.
	if [ ${ARCH} = "powerpc" ]; then
		if [ -e arch/powerpc/lib/crtsavres.o ]; then
			mkdir -p $kerneldir/arch/powerpc/lib/
			cp arch/powerpc/lib/crtsavres.o $kerneldir/arch/powerpc/lib/crtsavres.o
		fi
	fi

	if [ -d include/generated ]; then
		mkdir -p $kerneldir/include/generated/
		cp -fR include/generated/* $kerneldir/include/generated/
	fi

	if [ -d arch/${ARCH}/include/generated ]; then
		mkdir -p $kerneldir/arch/${ARCH}/include/generated/
		cp -fR arch/${ARCH}/include/generated/* $kerneldir/arch/${ARCH}/include/generated/
	fi

	if (grep -q -i -e '^CONFIG_UNWINDER_ORC=y$' $kerneldir/.config); then
		# With CONFIG_UNWINDER_ORC (the default in 4.14), objtool is required for
		# out-of-tree modules to be able to generate object files.
		if [ -x tools/objtool/objtool ]; then
			mkdir -p ${kerneldir}/tools/objtool
			cp tools/objtool/objtool ${kerneldir}/tools/objtool/
		fi
	fi

	# When building with CONFIG_MODVERSIONS=y and CONFIG_RANDSTRUCT=y we need
	# to copy the build assets generated for the randstruct seed to
	# STAGING_KERNEL_BUILDDIR, otherwise the out-of-tree modules build will
	# generate those assets which will result in a different
	# RANDSTRUCT_HASHED_SEED
	if [ -d scripts/basic ]; then
		mkdir -p ${kerneldir}/scripts
		cp -r scripts/basic ${kerneldir}/scripts
	fi

	if [ -d scripts/gcc-plugins ]; then
		mkdir -p ${kerneldir}/scripts
		cp -r scripts/gcc-plugins ${kerneldir}/scripts
	fi

}

# We don't need to stage anything, not the modules/firmware since those would clash with linux-firmware
SYSROOT_DIRS = ""

KERNEL_LOCALVERSION ??= ""
KERNEL_CONFIG_COMMAND ?= "oe_runmake_call -C ${S} O=${B} olddefconfig || oe_runmake -C ${S} O=${B} oldnoconfig"

python check_oldest_kernel() {
    oldest_kernel = d.getVar('OLDEST_KERNEL')
    kernel_version = d.getVar('KERNEL_VERSION')
    tclibc = d.getVar('TCLIBC')
    if tclibc == 'glibc':
        kernel_version = kernel_version.split('-', 1)[0]
        if oldest_kernel and kernel_version:
            if bb.utils.vercmp_string(kernel_version, oldest_kernel) < 0:
                bb.warn('%s: OLDEST_KERNEL is "%s" but the version of the kernel you are building is "%s" - therefore %s as built may not be compatible with this kernel. Either set OLDEST_KERNEL to an older version, or build a newer kernel.' % (d.getVar('PN'), oldest_kernel, kernel_version, tclibc))
}

check_oldest_kernel[vardepsexclude] += "OLDEST_KERNEL KERNEL_VERSION"
do_configure[prefuncs] += "check_oldest_kernel"

kernel_do_configure() {
	# fixes extra + in /lib/modules/2.6.37+
	# $ scripts/setlocalversion . => +
	# $ make kernelversion => 2.6.37
	# $ make kernelrelease => 2.6.37+
	if [ ! -e ${B}/.scmversion -a ! -e ${S}/.scmversion ]; then
		echo ${KERNEL_LOCALVERSION} > ${B}/.scmversion
		echo ${KERNEL_LOCALVERSION} > ${S}/.scmversion
	fi

	if [ "${S}" != "${B}" ] && [ -f "${S}/.config" ] && [ ! -f "${B}/.config" ]; then
		mv "${S}/.config" "${B}/.config"
	fi

	# Copy defconfig to .config if .config does not exist. This allows
	# recipes to manage the .config themselves in do_configure:prepend().
	if [ -f "${WORKDIR}/defconfig" ] && [ ! -f "${B}/.config" ]; then
		cp "${WORKDIR}/defconfig" "${B}/.config"
	fi

	${KERNEL_CONFIG_COMMAND}
}

do_savedefconfig() {
	bbplain "Saving defconfig to:\n${B}/defconfig"
	oe_runmake -C ${B} savedefconfig
}
do_savedefconfig[nostamp] = "1"
addtask savedefconfig after do_configure

inherit cml1 pkgconfig

# Need LD, HOSTLDFLAGS and more for config operations
KCONFIG_CONFIG_COMMAND:append = " ${EXTRA_OEMAKE}"

EXPORT_FUNCTIONS do_compile do_transform_kernel do_transform_bundled_initramfs do_install do_configure

# kernel-base becomes kernel-${KERNEL_VERSION}
# kernel-image becomes kernel-image-${KERNEL_VERSION}
PACKAGES = "${KERNEL_PACKAGE_NAME} ${KERNEL_PACKAGE_NAME}-base ${KERNEL_PACKAGE_NAME}-vmlinux ${KERNEL_PACKAGE_NAME}-image ${KERNEL_PACKAGE_NAME}-dev ${KERNEL_PACKAGE_NAME}-modules ${KERNEL_PACKAGE_NAME}-dbg"
FILES:${PN} = ""
FILES:${KERNEL_PACKAGE_NAME}-base = "${nonarch_base_libdir}/modules/${KERNEL_VERSION}/modules.order ${nonarch_base_libdir}/modules/${KERNEL_VERSION}/modules.builtin ${nonarch_base_libdir}/modules/${KERNEL_VERSION}/modules.builtin.modinfo"
FILES:${KERNEL_PACKAGE_NAME}-image = ""
FILES:${KERNEL_PACKAGE_NAME}-dev = "/${KERNEL_IMAGEDEST}/System.map* /${KERNEL_IMAGEDEST}/Module.symvers* /${KERNEL_IMAGEDEST}/config* ${KERNEL_SRC_PATH} ${nonarch_base_libdir}/modules/${KERNEL_VERSION}/build"
FILES:${KERNEL_PACKAGE_NAME}-vmlinux = "/${KERNEL_IMAGEDEST}/vmlinux-${KERNEL_VERSION_NAME}"
FILES:${KERNEL_PACKAGE_NAME}-modules = ""
FILES:${KERNEL_PACKAGE_NAME}-dbg = "/usr/lib/debug /usr/src/debug"
RDEPENDS:${KERNEL_PACKAGE_NAME} = "${KERNEL_PACKAGE_NAME}-base (= ${EXTENDPKGV})"
# Allow machines to override this dependency if kernel image files are
# not wanted in images as standard
RRECOMMENDS:${KERNEL_PACKAGE_NAME}-base ?= "${KERNEL_PACKAGE_NAME}-image (= ${EXTENDPKGV})"
PKG:${KERNEL_PACKAGE_NAME}-image = "${KERNEL_PACKAGE_NAME}-image-${@legitimize_package_name(d.getVar('KERNEL_VERSION'))}"
RDEPENDS:${KERNEL_PACKAGE_NAME}-image += "${@oe.utils.conditional('KERNEL_IMAGETYPE', 'vmlinux', '${KERNEL_PACKAGE_NAME}-vmlinux (= ${EXTENDPKGV})', '', d)}"
PKG:${KERNEL_PACKAGE_NAME}-base = "${KERNEL_PACKAGE_NAME}-${@legitimize_package_name(d.getVar('KERNEL_VERSION'))}"
RPROVIDES:${KERNEL_PACKAGE_NAME}-base += "${KERNEL_PACKAGE_NAME}-${KERNEL_VERSION}"
ALLOW_EMPTY:${KERNEL_PACKAGE_NAME} = "1"
ALLOW_EMPTY:${KERNEL_PACKAGE_NAME}-base = "1"
ALLOW_EMPTY:${KERNEL_PACKAGE_NAME}-image = "1"
ALLOW_EMPTY:${KERNEL_PACKAGE_NAME}-modules = "1"
DESCRIPTION:${KERNEL_PACKAGE_NAME}-modules = "Kernel modules meta package"

pkg_postinst:${KERNEL_PACKAGE_NAME}-base () {
	if [ ! -e "$D/lib/modules/${KERNEL_VERSION}" ]; then
		mkdir -p $D/lib/modules/${KERNEL_VERSION}
	fi
	if [ -n "$D" ]; then
		depmodwrapper -a -b $D ${KERNEL_VERSION} ${KERNEL_PACKAGE_NAME}
	else
		depmod -a ${KERNEL_VERSION}
	fi
}

PACKAGESPLITFUNCS =+ "split_kernel_packages"

python split_kernel_packages () {
    do_split_packages(d, root='${nonarch_base_libdir}/firmware', file_regex=r'^(.*)\.(bin|fw|cis|csp|dsp)$', output_pattern='${KERNEL_PACKAGE_NAME}-firmware-%s', description='Firmware for %s', recursive=True, extra_depends='')
}

# Many scripts want to look in arch/$arch/boot for the bootable
# image. This poses a problem for vmlinux and vmlinuz based
# booting. This task arranges to have vmlinux and vmlinuz appear
# in the normalized directory location.
do_kernel_link_images() {
	if [ ! -d "${B}/arch/${ARCH}/boot" ]; then
		mkdir ${B}/arch/${ARCH}/boot
	fi
	cd ${B}/arch/${ARCH}/boot
	ln -sf ../../../vmlinux
	if [ -f ../../../vmlinuz ]; then
		ln -sf ../../../vmlinuz
	fi
	if [ -f ../../../vmlinuz.bin ]; then
		ln -sf ../../../vmlinuz.bin
	fi
	if [ -f ../../../vmlinux.64 ]; then
		ln -sf ../../../vmlinux.64
	fi
}
addtask kernel_link_images after do_compile before do_strip

python do_strip() {
    import shutil

    strip = d.getVar('STRIP')
    extra_sections = d.getVar('KERNEL_IMAGE_STRIP_EXTRA_SECTIONS')
    kernel_image = d.getVar('B') + "/" + d.getVar('KERNEL_OUTPUT_DIR') + "/vmlinux"

    if (extra_sections and kernel_image.find(d.getVar('KERNEL_IMAGEDEST') + '/vmlinux') != -1):
        kernel_image_stripped = kernel_image + ".stripped"
        shutil.copy2(kernel_image, kernel_image_stripped)
        oe.package.runstrip((kernel_image_stripped, 8, strip, extra_sections))
        bb.debug(1, "KERNEL_IMAGE_STRIP_EXTRA_SECTIONS is set, stripping sections: " + \
            extra_sections)
}
do_strip[dirs] = "${B}"

addtask strip before do_sizecheck after do_kernel_link_images

# Support checking the kernel size since some kernels need to reside in partitions
# with a fixed length or there is a limit in transferring the kernel to memory.
# If more than one image type is enabled, warn on any that don't fit but only fail
# if none fit.
do_sizecheck() {
	if [ ! -z "${KERNEL_IMAGE_MAXSIZE}" ]; then
		invalid=`echo ${KERNEL_IMAGE_MAXSIZE} | sed 's/[0-9]//g'`
		if [ -n "$invalid" ]; then
			die "Invalid KERNEL_IMAGE_MAXSIZE: ${KERNEL_IMAGE_MAXSIZE}, should be an integer (The unit is Kbytes)"
		fi
		at_least_one_fits=
		for imageType in ${KERNEL_IMAGETYPES} ; do
			size=`du -ks ${B}/${KERNEL_OUTPUT_DIR}/$imageType | awk '{print $1}'`
			if [ $size -gt ${KERNEL_IMAGE_MAXSIZE} ]; then
				bbwarn "This kernel $imageType (size=$size(K) > ${KERNEL_IMAGE_MAXSIZE}(K)) is too big for your device."
			else
				at_least_one_fits=y
			fi
		done
		if [ -z "$at_least_one_fits" ]; then
			die "All kernel images are too big for your device. Please reduce the size of the kernel by making more of it modular."
		fi
	fi
}
do_sizecheck[dirs] = "${B}"

addtask sizecheck before do_install after do_strip

inherit kernel-artifact-names

kernel_do_deploy() {
	deployDir="${DEPLOYDIR}"
	if [ -n "${KERNEL_DEPLOYSUBDIR}" ]; then
		deployDir="${DEPLOYDIR}/${KERNEL_DEPLOYSUBDIR}"
		mkdir "$deployDir"
	fi

	for imageType in ${KERNEL_IMAGETYPES} ; do
		baseName=$imageType-${KERNEL_IMAGE_NAME}

		if [ -s ${KERNEL_OUTPUT_DIR}/$imageType.stripped ] ; then
			install -m 0644 ${KERNEL_OUTPUT_DIR}/$imageType.stripped $deployDir/$baseName${KERNEL_IMAGE_BIN_EXT}
		else
			install -m 0644 ${KERNEL_OUTPUT_DIR}/$imageType $deployDir/$baseName${KERNEL_IMAGE_BIN_EXT}
		fi
		if [ -n "${KERNEL_IMAGE_LINK_NAME}" ] ; then
			ln -sf $baseName${KERNEL_IMAGE_BIN_EXT} $deployDir/$imageType-${KERNEL_IMAGE_LINK_NAME}${KERNEL_IMAGE_BIN_EXT}
		fi
		if [ "${KERNEL_IMAGETYPE_SYMLINK}" = "1" ] ; then
			ln -sf $baseName${KERNEL_IMAGE_BIN_EXT} $deployDir/$imageType
		fi
	done

	if [ ${MODULE_TARBALL_DEPLOY} = "1" ] && (grep -q -i -e '^CONFIG_MODULES=y$' .config); then
		mkdir -p ${D}${root_prefix}/lib
		if [ -n "${SOURCE_DATE_EPOCH}" ]; then
			TAR_ARGS="--sort=name --clamp-mtime --mtime=@${SOURCE_DATE_EPOCH}"
		else
			TAR_ARGS=""
		fi
		TAR_ARGS="$TAR_ARGS --owner=0 --group=0"
		tar $TAR_ARGS -cv -C ${D}${root_prefix} lib | gzip -9n > $deployDir/modules-${MODULE_TARBALL_NAME}.tgz

		if [ -n "${MODULE_TARBALL_LINK_NAME}" ] ; then
			ln -sf modules-${MODULE_TARBALL_NAME}.tgz $deployDir/modules-${MODULE_TARBALL_LINK_NAME}.tgz
		fi
	fi

	if [ ! -z "${INITRAMFS_IMAGE}" -a x"${INITRAMFS_IMAGE_BUNDLE}" = x1 ]; then
		for imageType in ${KERNEL_IMAGETYPES} ; do
			if [ "$imageType" = "fitImage" ] ; then
				continue
			fi
			initramfsBaseName=$imageType-${INITRAMFS_NAME}
			install -m 0644 ${KERNEL_OUTPUT_DIR}/$imageType.initramfs $deployDir/$initramfsBaseName${KERNEL_IMAGE_BIN_EXT}
			if [ -n "${INITRAMFS_LINK_NAME}" ] ; then
				ln -sf $initramfsBaseName${KERNEL_IMAGE_BIN_EXT} $deployDir/$imageType-${INITRAMFS_LINK_NAME}${KERNEL_IMAGE_BIN_EXT}
			fi
		done
	fi
}

# We deploy to filenames that include PKGV and PKGR, read the saved data to
# ensure we get the right values for both
do_deploy[prefuncs] += "read_subpackage_metadata"

addtask deploy after do_populate_sysroot do_packagedata

EXPORT_FUNCTIONS do_deploy

# Add using Device Tree support
inherit kernel-devicetree