kernels: add linux-libre-aarch64

Some System On a Chip (SOC) have 64bit ARM CPUs that are also
capable of running arm 32bit applications.

Since:
- Parabola doesn't have an aarch64 package repository yet
- The devicetree of devices using such System On a Chip
  are not compiled when using the armv7 defconfig
- Drivers or other platform support code for such hardware
  might also not be compiled in with the armv7 defconfig
- This approach has already been tested with the linux-libre-x86_64
  kenrel

It's then a good idea to add support for such devices by adding
an arrch64 kernel as the maintenance and work is minimal.

The downside is that the external kernel modules that are either
compiled against the kernel or using DKMS will not work by default.

It's however still possible to compile them by hand by using
ARCH= and CROSS_COMPILE= as it is done for this kernel, so it
should be relatively easy to add support for the non-dkms modules.

As for DKMS, someone would need to look into it to understand how
to pass it the make flags (ARCH= and CROSS_COMPILE=) that are
required to automatically build modules.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

1 files changed, 391 insertions, 0 deletions

diff --git a/kernels/linux-libre-arm64/PKGBUILD b/kernels/linux-libre-arm64/PKGBUILD
new file mode 100644
index 000000000..5616aaba3
--- /dev/null
+++ b/kernels/linux-libre-arm64/PKGBUILD
@@ -0,0 +1,391 @@
+# Maintainer: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
+# Feel free to push modifications or take over maintainership
+
+# Based on the linux-libre package
+
+_replacesarchkernel=('linux%') # '%' gets replaced with kernel suffix
+_replacesoldkernels=() # '%' gets replaced with kernel suffix
+_replacesoldmodules=() # '%' gets replaced with kernel suffix
+
+pkgbase=linux-libre-aarch64
+pkgver=5.4.8
+pkgrel=1
+pkgdesc='Linux-libre-aarch64'
+rcnver=5.4.5
+rcnrel=armv7-x13
+url='https://linux-libre.fsfla.org/'
+arch=(armv7h)
+license=(GPL2)
+makedepends=(
+  bc kmod libelf
+  xmlto python-sphinx python-sphinx_rtd_theme graphviz imagemagick
+)
+makedepends+=('aarch64-linux-gnu-gcc')
+options=('!strip')
+_srcname=linux-5.4
+source=(
+  "https://linux-libre.fsfla.org/pub/linux-libre/releases/${_srcname##*-}-gnu/linux-libre-${_srcname##*-}-gnu.tar.xz"{,.sign}
+  "https://linux-libre.fsfla.org/pub/linux-libre/releases/$pkgver-gnu/patch-${_srcname##*-}-gnu-$pkgver-gnu.xz"{,.sign}
+  "https://repo.parabola.nu/other/linux-libre/logos/logo_linux_"{clut224.ppm,vga16.ppm,mono.pbm}{,.sig}
+  config.i686 config.x86_64 config.armv7h    # the main kernel config files
+  linux-armv7h.preset                        # armv7h preset file for mkinitcpio ramdisk
+  "kernel"{.its,.keyblock,_data_key.vbprivk} # files for signing Chromebooks kernels
+
+  # maintain the TTY over USB disconnects
+  # http://www.coreboot.org/EHCI_Gadget_Debug
+  0001-usb-serial-gadget-no-TTY-hangup-on-USB-disconnect-WI.patch
+  # fix Atmel maXTouch touchscreen support
+  # https://labs.parabola.nu/issues/877
+  # http://www.fsfla.org/pipermail/linux-libre/2015-November/003202.html
+  0002-fix-Atmel-maXTouch-touchscreen-support.patch
+  # extracted patches from Arch Linux kernel sources
+  0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
+  0002-lib-devres-add-a-helper-function-for-ioremap_uc.patch
+  0003-mfd-intel-lpss-Use-devm_ioremap_uc-for-MMIO.patch
+  0004-PCI-pciehp-Do-not-disable-interrupt-twice-on-suspend.patch
+  0005-PCI-pciehp-Prevent-deadlock-on-disconnect.patch
+  0006-ACPI-PM-s2idle-Rework-ACPI-events-synchronization.patch
+  0007-iwlwifi-pcie-restore-support-for-Killer-Qu-C0-NICs.patch
+  0008-x86-intel-Disable-HPET-on-Intel-Ice-Lake-platforms.patch
+  0009-drm-i915-save-AUD_FREQ_CNTRL-state-at-audio-domain-s.patch
+  0010-drm-i915-Fix-audio-power-up-sequence-for-gen10-displ.patch
+  0011-drm-i915-extend-audio-CDCLK-2-BCLK-constraint-to-mor.patch
+  0012-drm-i915-gt-Detect-if-we-miss-WaIdleLiteRestore.patch
+  0013-pinctrl-sunrisepoint-Add-missing-Interrupt-Status-re.patch
+)
+source_armv7h=(
+  # RCN patch (CM3 firmware deblobbed and bloatware removed)
+  "https://repo.parabola.nu/other/rcn-libre/patches/$rcnver/rcn-libre-$rcnver-$rcnrel.patch"{,.sig}
+  # Arch Linux ARM patches
+  0001-ARM-atags-add-support-for-Marvell-s-u-boot.patch
+  0002-ARM-atags-fdt-retrieve-MAC-addresses-from-Marvell-bo.patch
+  0003-SMILE-Plug-device-tree-file.patch
+  0004-fix-mvsdio-eMMC-timing.patch
+  0005-net-smsc95xx-Allow-mac-address-to-be-set-as-a-parame.patch
+  0006-set-default-cubietruck-led-triggers.patch
+  0007-exynos4412-odroid-set-higher-minimum-buck2-regulator.patch
+  0008-ARM-dove-enable-ethernet-on-D3Plug.patch
+  0009-USB-Armory-MkII-support.patch
+)
+validpgpkeys=(
+  '474402C8C582DAFBE389C427BCB7CF877E7D47A7' # Alexandre Oliva
+  '6DB9C4B4F0D8C0DC432CF6E4227CA7C556B2BA78' # David P.
+)
+sha512sums=('0d0915133864eb031adfc6700066147dcf3e768a50a31c39754950c95ef4fd322dc701cd50af49c403ef0325adfcb07e354d5e46c1be3dcdd719a7a55c963f37'
+            'SKIP'
+            '6cf4a01741eec4763e6bbb9762aafad815716f61d43b522da294cf8b2d2a1fc5228fffd710aa5e19aa4ffaa8e59b4ea37cfb987cb49d2cff064b8899b0558fba'
+            'SKIP'
+            '13cb5bc42542e7b8bb104d5f68253f6609e463b6799800418af33eb0272cc269aaa36163c3e6f0aacbdaaa1d05e2827a4a7c4a08a029238439ed08b89c564bb3'
+            'SKIP'
+            '7a3716bfe3b9f546da309c7492f3e08f8f506813afeb1c737a474c83313d5c313cf4582b65215c2cfce3b74d9d1021c96e8badafe8f6e5b01fe28d2b5c61ae78'
+            'SKIP'
+            '267295aa0cea65684968420c68b32f1a66a22d018b9d2b2c1ef14267bcf4cb68aaf7099d073cbfefe6c25c8608bdcbbd45f7ac8893fdcecbf1e621abdfe9ecc1'
+            'SKIP'
+            '4f0c8068f2532a60f3368ecc2147f6c33b19f934540655390751629b0981b1bf208f2ec563f5fcfbcf3537140bafd9ed0993cdc8f5b0b71914939d601afc4c29'
+            'a923bb36ff24d3f2326b0b6bccb8cdfe2ed2ab2acdae17dfcaf9beb269995a52bfba751ad7e616544ef4b98dd9487a66fe04dae2ec2e7d724f8ac47382ee71bd'
+            'b0dbc53ec688eae4ea92181fb7658361c2647b8f6271f145e35b36a93e5170ddc285ebd78c1218e239b4f551b8a4c75b6a9a8beff7367250b302d5900ad0cff5'
+            'f01e7925b262d2874a8a991b1f27d057356a2a384d2012b61be5a631d4e4d7cf87461c8fb9e7f183831f5a829ad204897f1f0545a52df6288a0e04a5c2e31b96'
+            '167bc73c6c1c63931806238905dc44c7d87c5a5c0f6293159f2133dfe717fb44081018d810675716d1605ec7dff5e8333b87b19e09e2de21d0448e447437873b'
+            'bb6718984a7357c9b00c37e4788480e5b8b75018c172ecc1441bc3fc5d2d42444eb5d8c7f9d2e3a7d6fed6d03acb565e3c0559486e494c40a7fe6bd0570c9ede'
+            '143dea30c6da00e504c99984a98a0eb2411f558fcdd9dfa7f607d6c14e9e7dffff9cb00121d9317044b07e3e210808286598c785ee854084b993ec9cb14d8232'
+            '02af4dd2a007e41db0c63822c8ab3b80b5d25646af1906dc85d0ad9bb8bbf5236f8e381d7f91cf99ed4b0978c50aee37cb9567cdeef65b7ec3d91b882852b1af'
+            'b8fe56e14006ab866970ddbd501c054ae37186ddc065bb869cf7d18db8c0d455118d5bda3255fb66a0dde38b544655cfe9040ffe46e41d19830b47959b2fb168'
+            '19084ed74a127eaed636309d142fbac122a6593b2f10f42c70ef79663e318edd7d433fd268a88c036ce38545f7d2fb14a94fb903040ecbf16287b28073a59d32'
+            '1c5e6e98dbfc2ec9512967aa9c746d7396df0dcc3b8dff38106a6097528b4bfdb60dd9aee7cd189fb710780fb3593dc173e4c348076dd1ae25c7870d41d53286'
+            'dbd1a0dff6ac0f481b4879b44aef5cf6ca9d37383c95ec664094138261bcaab689b873f688f77a6df4f11145a4fb27a4b0676fae5eae16e0f3cbe1392acf1266'
+            '51b47890987eca1def8019464eb41d3c32038fc4158f6a8e4f06adc2cb6567599fadd1835cb35d5edc7b144749ccafed0ad4f8ce4996edf2cf60fa5a46725f20'
+            'a79a8900aae9ee2587cc7989b7e77215c63c0fc3bc75eb5ab0b50d378f6bb4072d46821514a97f81bd79498c6fb6ce97183110ccf7baa9b8434e560857f61611'
+            'c94cfe2b0c9e02c020955f0315b6b61be51125f612ce50dff15d8a3bd8de2976a98df56283d0198f977570974c12b15219c457d2682927f8a0fd9344b3e324b6'
+            '629012611c1100cc832121c1d53da9a414abfe638a8273488ca319229a66a706ad15d88cdfe3b1769a6176ba7df24fe585f794a502e20e9134730fcfe0341dc3'
+            '809461f3c3e3ec6019b0cde26cf69dfb8f171c49cf8a95c59d4bc84cc331aad0c7f5c313844fb7c655cc54381d2737fb9cbedd4cd047c68b0bd217c480d6f7b0'
+            '2165f7e671c61d43b7bb89c3edcf3cd4bf16a4e57eccd44f18eabeadeae250ed57fe0fd20efc101e11d49444edb3956db05f6fe7038b0ce1c3cca37f96795e1c'
+            'ff457ff06c3ea8e2a67346eb728540985f8a0dc172e818d381e88a97917b9c34d5b7938e49b08ce76692123c623f941714b31bd07c1b65e60beaa7e2b7ae5af9'
+            '277a8f3e9b0b015690ac82ef4e9c531d8e1a1ef2cb173ec73f807c649844623d1505f7f82d6b97134d1398e4a197586126d3df6c4925f40aaed7a60ed10c7986'
+            '3499d257cce45e9abc6ae040bb8f38c76dce6f23c1986c4b753a44f32528671d7d24ddd230ab639eb23f9081624f986697c604e1bdb12a0e4b91ea60ce91ea01'
+            'b17d58ea538af2f250dd3587323cb36e96fbd8c0d406792e5b7dc828c6bce25fdf5834185cb42e327450b74cd0821260d1f53a84057a3d72b004394d9393e19d')
+sha512sums_armv7h=('bc449032f904b5ef5c4506124871230587dd72849f7fed1d7e9f6ab6f530c24415dfa0f29b27fa98191a671c9646b6066fbf163b5533774307dc68f610e3958f'
+                   'SKIP'
+                   'b576a9c40ba59485c350f71b9234d9e71f245e25b26382bd2f67019f3309c3b5705a6020eae0a9dfccacc763fb2056a5937c0a8ff4e64f99ba1d60f0b2acb03f'
+                   '85a13a274d4cbaca3ddbe8eaf883f1a1184765f8d09d6d40bb32defbe0876cb0153513e8db8671d7fc053e383ced793b74245ff29364a760e1a52bb36ebc8e85'
+                   'f9ce0bb4f06be6f742d8a31384e90fdab1a4686f14d5a8845e0c341dcfa62ae59db933237174223de9b32f9d91f99125c20ede7dff664755f1d42ea0cecdefdb'
+                   'b32623904f984118ebdd8ec31816885d73776ed80a68fa23925e67451f28a8f080dd8545307bb2f857435894adfa8b3db7c8a99aa02b8b3f2b5f8e3223d98a47'
+                   'd114f1e69504413e81dd67684f5b1ce69aa09d5bc768c7eee96a7d6b7ec47b32cd8f02593c878b0e9091475467de36a3d7c478e34a39148fa849548f53637b84'
+                   'bc0c6b1726679498393be8d4c417c62e1f356fe5c617c71ff23532652fdd5f314e5bfc6172eaca79cd4806b81031bf2f879d7d1a6050ad4c616c04e6bdf93c2a'
+                   'b13bea6412580325dba0d02cf0dc712e860f659569ffcb968aa4836fdb2882448cfee4659a675a70affccae02c8d2589d80b7239eef5ae7b615162aeaa76f3bb'
+                   'cff59f974651614587313674455a968ae5390a5ca825d204f0e2f8de2b422d577b007f5297a398e2afeb33ed0d324d34ad58ff4cd56e645bd4ca9a6bdc1354c5'
+                   '54adbec4b6b85cda901df7d2b3eb1f517f10d3528326e60c7afa4b49ccc7cfb43b0d1f574ceb5d7d03c94a0fbcc97c0ef785258292dd26ed46728355da27332c')
+
+_replacesarchkernel=("${_replacesarchkernel[@]/\%/${pkgbase#linux-libre}}")
+_replacesoldkernels=("${_replacesoldkernels[@]/\%/${pkgbase#linux-libre}}")
+_replacesoldmodules=("${_replacesoldmodules[@]/\%/${pkgbase#linux-libre}}")
+
+case "$CARCH" in
+  i686|x86_64) KARCH=x86;;
+  armv7h) KARCH=arm;;
+esac
+
+export KBUILD_BUILD_HOST=parabola
+export KBUILD_BUILD_USER=$pkgbase
+export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"
+
+prepare() {
+  cd $_srcname
+
+  if [ "${_srcname##*-}" != "$pkgver" ]; then
+    msg2 "Applying upstream patch..."
+    patch -Np1 -i ../patch-${_srcname##*-}-gnu-$pkgver-gnu
+  fi
+
+  msg2 "Adding freedo as boot logo..."
+  install -m644 -t drivers/video/logo \
+    ../logo_linux_{clut224.ppm,vga16.ppm,mono.pbm}
+
+  msg2 "Setting version..."
+  scripts/setlocalversion --save-scmversion
+  echo "-$pkgrel" > localversion.10-pkgrel
+  echo "${pkgbase#linux-libre}" > localversion.20-pkgname
+
+  if [ "$CARCH" = "armv7h" ]; then
+    local src_armv7h
+    for src_armv7h in "${source_armv7h[@]}"; do
+      src_armv7h="${src_armv7h%%::*}"
+      src_armv7h="${src_armv7h##*/}"
+      [[ $src_armv7h = *.patch ]] || continue
+      msg2 "Applying patch $src_armv7h..."
+      patch -Np1 < "../$src_armv7h"
+    done
+  fi
+
+  local src
+  for src in "${source[@]}"; do
+    src="${src%%::*}"
+    src="${src##*/}"
+    [[ $src = *.patch ]] || continue
+    msg2 "Applying patch $src..."
+    patch -Np1 < "../$src"
+  done
+
+  msg2 "Setting config..."
+  cp ../config.aarch64 .config
+  make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- olddefconfig
+
+  make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -s kernelrelease > version
+  msg2 "Prepared %s version %s" "$pkgbase" "$(<version)"
+}
+
+build() {
+  cd $_srcname
+  make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- zImage modules htmldocs
+}
+
+_package() {
+  pkgdesc="The $pkgdesc kernel and modules"
+  depends=(coreutils kmod initramfs)
+  optdepends=('crda: to set the correct wireless channels of your country'
+              'linux-libre-firmware: firmware images needed for some devices')
+  provides=("${_replacesarchkernel[@]/%/=$pkgver}" "LINUX-ABI_VERSION=$pkgver")
+  conflicts=("${_replacesarchkernel[@]}" "${_replacesoldkernels[@]}" "${_replacesoldmodules[@]}")
+  replaces=("${_replacesarchkernel[@]}" "${_replacesoldkernels[@]}" "${_replacesoldmodules[@]}")
+
+  cd $_srcname
+  local kernver="$(<version)"
+  local modulesdir="$pkgdir/usr/lib/modules/$kernver"
+
+  msg2 "Installing boot image..."
+  if [ "$CARCH" = "armv7h" ]; then
+    make INSTALL_DTBS_PATH="$pkgdir/boot/dtbs/$pkgbase" dtbs_install
+  fi
+  # systemd expects to find the kernel here to allow hibernation
+  # https://github.com/systemd/systemd/commit/edda44605f06a41fb86b7ab8128dcf99161d2344
+  install -Dm644 "$(make -s image_name)" "$modulesdir/vmlinuz"
+
+  # Used by mkinitcpio to name the kernel
+  echo "$pkgbase" | install -Dm644 /dev/stdin "$modulesdir/pkgbase"
+
+  msg2 "Installing modules..."
+  make INSTALL_MOD_PATH="$pkgdir/usr" modules_install
+
+  # remove build and source links
+  rm "$modulesdir"/{source,build}
+
+  # armv7h presets only work with ALL_kver=$kernver
+  if [ "$CARCH" = "armv7h" ]; then
+    backup=("etc/mkinitcpio.d/$pkgbase.preset")
+
+    msg2 "Installing mkinitcpio preset..."
+    sed "s|%PKGBASE%|$pkgbase|g;s|%KERNVER%|$kernver|g" ../linux-armv7h.preset \
+      | install -Dm644 /dev/stdin "$pkgdir/etc/mkinitcpio.d/$pkgbase.preset"
+  fi
+
+  msg2 "Fixing permissions..."
+  chmod -Rc u=rwX,go=rX "$pkgdir"
+}
+
+_package-headers() {
+  pkgdesc="Headers and scripts for building modules for the $pkgdesc kernel"
+  provides=("${_replacesarchkernel[@]/%/-headers=$pkgver}")
+  conflicts=("${_replacesarchkernel[@]/%/-headers}" "${_replacesoldkernels[@]/%/-headers}")
+  replaces=("${_replacesarchkernel[@]/%/-headers}" "${_replacesoldkernels[@]/%/-headers}")
+
+  cd $_srcname
+  local builddir="$pkgdir/usr/lib/modules/$(<version)/build"
+
+  msg2 "Installing build files..."
+  install -Dt "$builddir" -m644 .config Makefile Module.symvers System.map \
+    localversion.* version vmlinux
+  install -Dt "$builddir/kernel" -m644 kernel/Makefile
+  install -Dt "$builddir/arch/$KARCH" -m644 arch/$KARCH/Makefile
+  if [[ $CARCH = i686 ]]; then
+    install -Dt "$builddir/arch/$KARCH" -m644 arch/$KARCH/Makefile_32.cpu
+  fi
+  cp -t "$builddir" -a scripts
+
+  # add objtool for external module building and enabled VALIDATION_STACK option
+  if [[ -e tools/objtool/objtool ]]; then
+    install -Dt "$builddir/tools/objtool" tools/objtool/objtool
+  fi
+
+  # add xfs and shmem for aufs building
+  mkdir -p "$builddir"/{fs/xfs,mm}
+
+  msg2 "Installing headers..."
+  cp -t "$builddir" -a include
+  cp -t "$builddir/arch/$KARCH" -a arch/$KARCH/include
+  install -Dt "$builddir/arch/$KARCH/kernel" -m644 arch/$KARCH/kernel/asm-offsets.s
+
+  install -Dt "$builddir/drivers/md" -m644 drivers/md/*.h
+  install -Dt "$builddir/net/mac80211" -m644 net/mac80211/*.h
+
+  # http://bugs.archlinux.org/task/13146
+  install -Dt "$builddir/drivers/media/i2c" -m644 drivers/media/i2c/msp3400-driver.h
+
+  # http://bugs.archlinux.org/task/20402
+  install -Dt "$builddir/drivers/media/usb/dvb-usb" -m644 drivers/media/usb/dvb-usb/*.h
+  install -Dt "$builddir/drivers/media/dvb-frontends" -m644 drivers/media/dvb-frontends/*.h
+  install -Dt "$builddir/drivers/media/tuners" -m644 drivers/media/tuners/*.h
+
+  msg2 "Installing KConfig files..."
+  find . -name 'Kconfig*' -exec install -Dm644 {} "$builddir/{}" \;
+
+  msg2 "Removing unneeded architectures..."
+  local arch
+  for arch in "$builddir"/arch/*/; do
+    [[ $arch = */$KARCH/ ]] && continue
+    echo "Removing $(basename "$arch")"
+    rm -r "$arch"
+  done
+
+  msg2 "Removing documentation..."
+  rm -r "$builddir/Documentation"
+
+  # Parabola changes
+  # 
+  # since we don't want to diverge too much from Arch's PKGBUILD, we'll
+  # start marking our changes as such
+  if [ "$CARCH" = "armv7h" ]; then
+    for i in dove exynos omap2; do
+      mkdir -p "$pkgdir/usr/lib/modules/$kernver/build/arch/$KARCH/mach-$i"
+      cp -a arch/$KARCH/mach-$i/include "$pkgdir/usr/lib/modules/$kernver/build/arch/$KARCH/mach-$i/"
+    done
+    for i in omap orion samsung versatile; do
+      mkdir -p "$pkgdir/usr/lib/modules/$kernver/build/arch/$KARCH/plat-$i"
+      cp -a arch/$KARCH/plat-$i/include "$pkgdir/usr/lib/modules/$kernver/build/arch/$KARCH/plat-$i/"
+    done
+  fi
+  # end of Parabola changes
+
+  msg2 "Removing broken symlinks..."
+  find -L "$builddir" -type l -printf 'Removing %P\n' -delete
+
+  msg2 "Removing loose objects..."
+  find "$builddir" -type f -name '*.o' -printf 'Removing %P\n' -delete
+
+  msg2 "Stripping build tools..."
+  local file
+  while read -rd '' file; do
+    case "$(file -bi "$file")" in
+      application/x-sharedlib\;*)      # Libraries (.so)
+        strip -v $STRIP_SHARED "$file" ;;
+      application/x-archive\;*)        # Libraries (.a)
+        strip -v $STRIP_STATIC "$file" ;;
+      application/x-executable\;*)     # Binaries
+        strip -v $STRIP_BINARIES "$file" ;;
+      application/x-pie-executable\;*) # Relocatable binaries
+        strip -v $STRIP_SHARED "$file" ;;
+    esac
+  done < <(find "$builddir" -type f -perm -u+x ! -name vmlinux -print0)
+
+  msg2 "Adding symlink..."
+  mkdir -p "$pkgdir/usr/src"
+  ln -sr "$builddir" "$pkgdir/usr/src/$pkgbase"
+
+  msg2 "Fixing permissions..."
+  chmod -Rc u=rwX,go=rX "$pkgdir"
+}
+
+_package-docs() {
+  pkgdesc="Documentation for the $pkgdesc kernel"
+  provides=("${_replacesarchkernel[@]/%/-docs=$pkgver}")
+  conflicts=("${_replacesarchkernel[@]/%/-docs}" "${_replacesoldkernels[@]/%/-docs}")
+  replaces=("${_replacesarchkernel[@]/%/-docs}" "${_replacesoldkernels[@]/%/-docs}")
+
+  cd $_srcname
+  local builddir="$pkgdir/usr/lib/modules/$(<version)/build"
+
+  msg2 "Installing documentation..."
+  local src dst
+  while read -rd '' src; do
+    dst="${src#Documentation/}"
+    dst="$builddir/Documentation/${dst#output/}"
+    install -Dm644 "$src" "$dst"
+  done < <(find Documentation -name '.*' -prune -o ! -type d -print0)
+
+  msg2 "Adding symlink..."
+  mkdir -p "$pkgdir/usr/share/doc"
+  ln -sr "$builddir/Documentation" "$pkgdir/usr/share/doc/$pkgbase"
+
+  msg2 "Fixing permissions..."
+  chmod -Rc u=rwX,go=rX "$pkgdir"
+}
+
+_package-chromebook() {
+  pkgdesc="Kernel image sign for $pkgdesc - Chromebooks"
+  depends=(linux-libre=$pkgver)
+  provides=("${_replacesarchkernel[@]/%/-armv7-chromebook=$pkgver}")
+  conflicts=("${_replacesarchkernel[@]/%/-armv7-chromebook}" "${_replacesoldkernels[@]/%/-armv7-chromebook}")
+  replaces=("${_replacesarchkernel[@]/%/-armv7-chromebook}" "${_replacesoldkernels[@]/%/-armv7-chromebook}")
+  install=linux-chromebook.install
+
+  cd $_srcname
+
+  cp ../kernel.its .
+  mkimage -D "-I dts -O dtb -p 2048" -f kernel.its kernel.itb
+  dd if=/dev/zero of=bootloader.bin bs=512 count=1
+  echo 'console=tty0 init=/sbin/init root=PARTUUID=%U/PARTNROFF=1 rootwait rw noinitrd' > cmdline
+
+  msg2 "Creating kernel sign..."
+  vbutil_kernel \
+    --pack vmlinux.kpart \
+    --version 1 \
+    --vmlinuz kernel.itb \
+    --arch arm \
+    --keyblock ../kernel.keyblock \
+    --signprivate ../kernel_data_key.vbprivk \
+    --config cmdline \
+    --bootloader bootloader.bin
+
+  msg2 "Installing kernel sign..."
+  mkdir -p "$pkgdir/boot"
+  cp vmlinux.kpart "$pkgdir/boot"
+}
+
+pkgname=("$pkgbase" "$pkgbase-headers" "$pkgbase-docs")
+[[ $CARCH = armv7h ]] && pkgname+=("$pkgbase-chromebook")
+for _p in "${pkgname[@]}"; do
+  eval "package_$_p() {
+    $(declare -f "_package${_p#$pkgbase}")
+    _package${_p#$pkgbase}
+  }"
+done
+
+# vim:set ts=8 sts=2 sw=2 et: