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jkloetzkejkloetzke
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Merge pull request #92 from sixtyfourktec/linux
Linux
2 parents f5207a8 + 0a82b89 commit e4019ad

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‎aliases/virtual/kernel/linux.yaml‎

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multiPackage:
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image: ${CONFIG_SELECT_LINUX:-kernel::linux}-image
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modules: ${CONFIG_SELECT_LINUX:-kernel::linux}-modules
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dtbs: ${CONFIG_SELECT_LINUX:-kernel::linux}-dtbs
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kmod-dist: ${CONFIG_SELECT_LINUX:-kernel::linux}-kmod-dist
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headers: ${CONFIG_SELECT_LINUX:-kernel::linux}-headers

‎classes/linux.yaml‎

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# Convenience methods for creating a Linux kernel
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#
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# Here we define helper methods for building the linux kernel and everything
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# around it. This means the kernel modules, any dtb's and dev targets like the
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# headers or an kmod-dist for building out-of-tree kernel modules.
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#
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# In its simplest form the usage looks something like the following. Note, that
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# the kernel is downloaded into the "linux" directory and that the
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# configuration files are put into the "conf" directory. Obviously you are free
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# to arrange this somehow differently. Of course you only need to implement the
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# targets required by your other recipes:
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#
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# inherit: [linux]
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#
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# ...
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#
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# metaEnvironment:
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# PKG_VERSION: 6.1.114
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#
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# checkoutSCM:
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# - scm: url
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# url: ${KERNEL_MIRROR}/linux/kernel/v6.x/linux-${PKG_VERSION}.tar.xz
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# digestSHA1: 72f98a7aa831dba4d56b6c28b1a5333b04fbae35
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# stripComponents: 1
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# dir: linux
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# - scm: import
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# url: src/linux
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# dir: conf
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#
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# buildScript: |
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# linuxConfig $1/linux $1/conf/linux.config
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#
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# multiPackage:
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# "":
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# buildScript: linuxBuild
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#
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# multiPackage:
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# image:
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# inherit: [linux::image]
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# packageScript: linuxInstallImage $1
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#
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# modules:
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# inherit: [linux::modules]
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# packageScript: linuxInstallModules $1
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#
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# kmod-dist:
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# inherit: [linux::kmod-dist]
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# packageScript: linuxInstallKmodDist $1
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#
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# dtbs:
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# inherit: [linux::dtbs]
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# buildScript: linuxBuildDtbs
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# packageScript: linuxInstallDtbs $1
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#
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# headers:
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# inherit: [linux::headers]
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# buildScript: linuxBuildHeaders
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# packageScript: linuxInstallHeaders $1
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#
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inherit: [cpackage, make, pkg-config]
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depends:
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- tools:
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target-toolchain: host-compat-toolchain
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depends:
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- libs::elfutils-libelf-dev
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- libs::openssl-dev
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- name: kernel::kmod
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use: [tools]
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privateEnvironment:
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LINUX_ARCH: "$(if-then-else,$(or,$(eq,${ARCH},i386),$(eq,${ARCH},x86_64)),x86,$(if-then-else,\
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$(or,$(eq,${ARCH},sh),$(eq,${ARCH},sh64)),sh,$(if-then-else,$(or,$(eq,${ARCH},sparc32),\
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$(eq,${ARCH},sparc64)),sparc,$ARCH)))"
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checkoutSCM:
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# Always download a script for extracting the files required to build
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# external kernel modules. If the kernel itself doesn't have one, we will
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# use this one.
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scm: url
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url: https://raw.githubusercontent.com/torvalds/linux/refs/tags/v6.11/scripts/package/install-extmod-build
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digestSHA1: 47eb760cf215cb3a15752186a18715fb04d9ab95
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dir: kmod-script
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buildVars: [LINUX_ARCH, ARCH, CROSS_COMPILE, CC]
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buildTools: [m4, bison, flex, target-toolchain, host-toolchain]
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buildSetup: |
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# make sure we find our kmod-dist script in the package step
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ln -sf $1/kmod-script .
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# Build the initial linux config. This will be used by all other steps.
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#
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# $1: linux kernel source directory
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# $2: defconfig (optional)
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# - if this is an actual file, use it as the config
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# - if this is not a file, check if a defconfig for the target arch by
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# that name exists and if yes, use that one
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linuxConfig()
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{
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DEF_CFG=${2:-$1/arch/${LINUX_ARCH}/configs/defconfig}
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if [[ -f "$1/arch/${LINUX_ARCH}/configs/${DEF_CFG}" ]] ; then
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DEF_CFG=$1/arch/${LINUX_ARCH}/configs/${DEF_CFG}
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fi
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# check if the defconfig file exists
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if [[ ! -f "$DEF_CFG" ]]; then
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>&2 echo "Don't know how to use '$DEF_CFG' as linux kernel config!"
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false
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fi
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# check if the source file is newer than .config
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if [[ -f .config && .config -nt $DEF_CFG ]]; then
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return 0
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fi
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# redo the .config file
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cp -u "$DEF_CFG" .config
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makeSequential -C $1 O=$PWD \
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olddefconfig
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}
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# Build the actual target linux image and all configured modules
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linuxBuild()
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{
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makeParallel \
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CC="$CC" \
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$(basename $(make -s image_name)) modules
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}

‎classes/linux/dtbs.yaml‎

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inherit: [linux]
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buildTools: [target-toolchain]
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buildVars: [CROSS_COMPILE]
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buildSetup: |
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# Build the device tree files.
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#
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# $1: device tree file(s) (optional)
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# - if this isn't provided, all default dtb's in the kernel directory
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# are build
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linuxBuildDtbs()
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{
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makeParallel ${1:-dtbs} "${@:2}"
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}
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packageSetup: |
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# Install the device tree files.
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#
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# $1: linux kernel build directory
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# $2: device tree file(s) (optional)
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# - if this isn't provided, all default dtb's in the kernel directory
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# are installed
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linuxInstallDtbs()
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{
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if [[ -n "${2:-}" ]]; then
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if [[ -d "$1/arch/$LINUX_ARCH/boot/dts" ]] ; then
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make -C "$1" INSTALL_DTBS_PATH="$PWD" dtbs_install
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fi
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else
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for i in "${@:2}" ; do
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cp "$1/arch/${LINUX_ARCH}/boot/dts/$i" "$PWD"
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done
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fi
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}

‎classes/linux/headers.yaml‎

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inherit: [linux]
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buildSetup: |
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# Build the linux kernel headers.
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linuxBuildHeaders()
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{
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make headers_install
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}
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packageSetup: |
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# Install the linux kernel headers.
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#
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# $1: linux kernel build directory
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linuxInstallHeaders()
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{
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cp -a $1/usr .
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}

‎classes/linux/image.yaml‎

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inherit: [linux]
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packageVars: [BASEMENT_DEBUG]
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packageSetup: |
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# Install the linux kernel image, the system.map and the .config used to
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# build the kernel.
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#
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# $1: linux kernel build directory
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# $2: destination image name (optional)
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linuxInstallImage()
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{
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src_img_name=$(make -s -C "$1" image_name)
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dst_img_name=${2:-$(basename $src_img_name)}
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cp "$1/$src_img_name" "${dst_img_name}"
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cp "$1/System.map" "${dst_img_name}-System.map"
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cp "$1/.config" "${dst_img_name}-config"
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if [[ ${BASEMENT_DEBUG:-0} != "0" ]] ; then
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mkdir -p .debug
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cp "$1/$src_img_name" ".debug/${dst_img_name}"
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fi
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}

‎classes/linux/kmod-dist.yaml‎

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inherit: [linux]
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packageSetup: |
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_SCRIPT_DIR=$1/kmod-script
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# Install the linux kernel modules distribution for building out-of-tree
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# kernel modules.
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#
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# $1: linux kernel build directory
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linuxInstallKmodDist()
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{
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OUT=$PWD
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# If the kernel itself provides a script for extracting the files required to
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# build external kernel modules, use that, otherwise use the downloaded fixed
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# version.
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# Default is kernel built-in script:
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SCRIPT=$1/source/scripts/package/install-extmod-build
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if [[ ! -e $SCRIPT ]]; then
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SCRIPT=$_SCRIPT_DIR/install-extmod-build
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fi
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pushd $1
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MAKE=make HOSTCC=gcc SRCARCH=$LINUX_ARCH srctree=$1/source KCONFIG_CONFIG=$1/.config \
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sh "$SCRIPT" "$OUT"
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popd
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}

‎classes/linux/menuconfig.yaml‎

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inherit: [linux]
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depends:
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- tools:
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target-toolchain: host-compat-toolchain
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depends:
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- libs::ncurses-dev
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buildSetup: |
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# Calls the linux savedefconfig target
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#
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# Especially in the sandbox this can be tricky. Provide some convenience method.
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linuxSavedefconfig()
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{
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makeParallel savedefconfig
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}
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# Calls the linux menuconfig target
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#
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# Especially in the sandbox this can be tricky. Provide some convenience method.
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linuxMenuconfig()
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{
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NCDEP=${BOB_DEP_PATHS[libs::ncurses-dev]}
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makeParallel \
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HOSTCC="gcc" \
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HOSTCFLAGS="-I${NCDEP}/usr/include -DCURSES_LOC=\"<ncurses.h>\" -DLOCALE" \
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HOSTLDLIBS="-L$(gcc --print-sysroot)/usr/lib -L${NCDEP}/usr/lib -lncurses -ltinfo" \
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menuconfig
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# Always save a defconfig
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linuxSavedefconfig
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}

‎classes/linux/modules.yaml‎

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inherit: [linux]
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packageToolsWeak: [kmod]
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packageVars: [BASEMENT_DEBUG, OBJCOPY]
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packageSetup: |
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# Install the built-in linux kernel modules.
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#
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# $1: linux kernel build directory
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linuxInstallModules()
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{
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make -C "$1" \
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INSTALL_MOD_PATH="$PWD" modules_install
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rm lib/modules/*/build
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# Strip all modules. Shamelessly ripped from builddeb...
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for module in $(find lib/modules/ -name *.ko -printf '%P\n'); do
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module=lib/modules/$module
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mkdir -p $(dirname lib/debug/$module)
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# only keep debug symbols in the debug file
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if [[ ${BASEMENT_DEBUG:-0} != "0" ]] ; then
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$OBJCOPY --only-keep-debug $module lib/debug/$module
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fi
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# strip original module from debug symbols
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$OBJCOPY --strip-debug $module
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# then add a link to those
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if [[ ${BASEMENT_DEBUG:-0} != "0" ]] ; then
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$OBJCOPY --add-gnu-debuglink=lib/debug/$module $module
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fi
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done
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}

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