# Maintainers: Parabola hackers <dev@lists.parabola.nu>

# WIP - Based on the linux-libre package.
#       this PKGBUILD includes a lot of cruft, to minimize the diff.
#       eventually, these chanegs can be merged into linux-libre
#       once parabola has an 'aarch64' build target and repos.


_replacesarchkernel=('linux%') # '%' gets replaced with kernel suffix
_replacesoldkernels=() # '%' gets replaced with kernel suffix
_replacesoldmodules=() # '%' gets replaced with kernel suffix

pkgbase=linux-libre-64
pkgver=5.18.5
pkgrel=1
pkgdesc="64bit Linux-libre for Parabola $CARCH"
rcnver=5.18.2
rcnrel=armv7-x6
url='https://linux-libre.fsfla.org/'
arch=(armv7h i686)
license=(GPL2)
makedepends=(
  bc libelf pahole cpio perl tar xz
  xmlto python-sphinx python-sphinx_rtd_theme graphviz imagemagick texlive-latexextra
)
makedepends_armv7h=(uboot-tools dtc) # required by linux-libre-chromebook
options=('!strip')
_srcname=linux-5.18
source=(
  "https://linux-libre.fsfla.org/pub/linux-libre/releases/${_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
  # Arch Linux patches
  0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
  0002-HID-apple-Properly-handle-function-keys-on-Keychron-.patch
)
source_i686=(
  # avoid using zstd compression in ultra mode (exhausts virtual memory)
  no-ultra-zstd.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 (for armv7h)
  0001-ARM-atags-add-support-for-Marvell-s-u-boot.patch
  0002-ARM-atags-fdt-retrieve-MAC-addresses-from-Marvell-bo.patch
  0003-fix-mvsdio-eMMC-timing.patch
  0004-net-smsc95xx-Allow-mac-address-to-be-set-as-a-parame.patch
  0005-set-default-cubietruck-led-triggers.patch
  0006-exynos4412-odroid-set-higher-minimum-buck2-regulator.patch
  0007-USB-Armory-MkII-support.patch
  # Arch Linux ARM patches (for aarch64)
  # ./0001-net-smsc95xx-Allow-mac-address-to-be-set-as-a-parame.patch
  0002-arm64-dts-rockchip-disable-pwm0-on-rk3399-firefly.patch
  # ChromiumOS patches
  0001-CHROMIUM-block-partitions-efi-Add-support-for-IGNORE.patch
)
source_armv7h+=(config.aarch64)
validpgpkeys=(
  '474402C8C582DAFBE389C427BCB7CF877E7D47A7' # Alexandre Oliva
  '6DB9C4B4F0D8C0DC432CF6E4227CA7C556B2BA78' # David P.
)
sha512sums=('13be3762fffd74c63eeb23b0d34b994a3e5198bfdbda4f013b38f8d3edd24b9bbebe5a4bfde0f5191aa1cf2678e4517f3b5540a40b30ebc05da1f6708cbb98bb'
            'SKIP'
            '9355c0f22606c0401e8a01d6e22f0fa6e97b69a9fce6d991235da6430907fb6a788fca30bd48e5cbb743cc4a211a40806c896f660db7432e7bc85ba7634b5d06'
            'SKIP'
            '13cb5bc42542e7b8bb104d5f68253f6609e463b6799800418af33eb0272cc269aaa36163c3e6f0aacbdaaa1d05e2827a4a7c4a08a029238439ed08b89c564bb3'
            'SKIP'
            '7a3716bfe3b9f546da309c7492f3e08f8f506813afeb1c737a474c83313d5c313cf4582b65215c2cfce3b74d9d1021c96e8badafe8f6e5b01fe28d2b5c61ae78'
            'SKIP'
            '267295aa0cea65684968420c68b32f1a66a22d018b9d2b2c1ef14267bcf4cb68aaf7099d073cbfefe6c25c8608bdcbbd45f7ac8893fdcecbf1e621abdfe9ecc1'
            'SKIP'
            'bcec71d3bd1daaa27bdf4c9a10f0b302b915e8236ef47b5e6d6eaf65bfd0b34644d8d3ff6c25d894ae21dedbece3c1f1ff152fbf8525b77100bc790d0541f3f1'
            'e141c387e8045030278d683a1294bfd3d13197bf3466a9c89c4f72a53aafed606acc8e42e528479527c638af895bce2303944b5d8b8a29040f5aae8a9581dd5a'
            '47d16ffc94510d4a8773146a46cfb35aca8cfdae38d17283334cd62d92de36250fbec90e9892357033398ecc7d970127b1a41b703a8372972422ca4af7c90c70'
            '53103bf55b957b657039510527df0df01279dec59cda115a4d6454e4135025d4546167fa30bdc99107f232561c1e096d8328609ab5a876cf7017176f92ad3e0b'
            'f10af02f0cb2d31259d9633e1ba845f555f525789f750fc2ddc51bd18c5ff64fcdd242dae801623887f5ce5cdb5528bce890459f0fab9fd31a28868bb7f6bba5'
            'bb6718984a7357c9b00c37e4788480e5b8b75018c172ecc1441bc3fc5d2d42444eb5d8c7f9d2e3a7d6fed6d03acb565e3c0559486e494c40a7fe6bd0570c9ede'
            '143dea30c6da00e504c99984a98a0eb2411f558fcdd9dfa7f607d6c14e9e7dffff9cb00121d9317044b07e3e210808286598c785ee854084b993ec9cb14d8232'
            '02af4dd2a007e41db0c63822c8ab3b80b5d25646af1906dc85d0ad9bb8bbf5236f8e381d7f91cf99ed4b0978c50aee37cb9567cdeef65b7ec3d91b882852b1af'
            'b8fe56e14006ab866970ddbd501c054ae37186ddc065bb869cf7d18db8c0d455118d5bda3255fb66a0dde38b544655cfe9040ffe46e41d19830b47959b2fb168'
            '1b6c3108d5628ca6db20c2bc3431e560ab2a274aaf863e7a796f1931a35982d175247f47cbfbb7d643ffc6b742442806755bb10339e5b0577c3f232b38288891'
            'bf6d9a66be49c2cc67b0a0f3cfb61734adf7a3b032b5ed133e1e0afbf4a6ddbd3e8231e4b85fef2e3aeb7274a60f7572a4469c057ff13d81134613f01767d3b2')
sha512sums_i686=('bca15cc96f64c38adcd13a46752866b5b30555ac21e19b3f7afcd20fcb7ec585c9d990fe8f842f44d5f69d477d72867fe6a9102729f26f93f5a80b372e41ce85')
sha512sums_armv7h=('5a75b12dd386940a0bf1be630d45a514ef3c32289ec5976988764baa8483b254e5dcc879337556bfa041b6dbf9ac16debbe4b57bf86db30089661e9536ffaa0a'
                   'SKIP'
                   '8da996a42249672893fa532ccbd096347580a0dc1698c45e9c865646e2765789553b1bb42793e721de30aea70340fdc116d2e4a50580fef999ca5fc627aaf4c3'
                   '0e6ddc24011d77a2e422b642c4507317fc2d26b20f5649818a2f11acac165ccab2cf2e64ab50d44ce7affcfe12c2ef5158790e499058831e7995400b2087df78'
                   '5d2f228151148358b07744a9c09cf6e2420c4284735d4ce7dc925a1deb3970298cc95dd766ee13e094e2853847b016c3ebc2d61bb423e370b4bc33938367ebda'
                   'a206c3dc678839831d72eefee997cbe1bb877af7f6f90dfe5cab0bd7d9686a3b13a2aba74c8fbe5533872e12306ac9ea1b5eede18ef3cf10b8d01361afd67e9c'
                   'a1072dd808c63592178cc01ea3c36de946f277fb451b13c34f51a5ac134cde4a8a4d57487132af1c6d7b5820842cdda9dc4edb3da85d33bd02bf87a032c3263a'
                   '85b2e16a930b8066990c42f973d386dc3c6d62fdf3d1289bbb51df3df296c26f30051162fba49a42d38f71f05de926aa8c065097f14bd8e9f8e28a52949ead00'
                   '2e99582d8b670b6c6b27add14b60e957cbcf9cd6aae40491bd9dea6ac455c0ade0bbee21e3bdfb5e06ce83ad27c5a788404b05bf7ac93831ca18d2e60a67017c'
                   '4224779106cc520dc2c431322d9693cc968476706854ae9630611cf2896c48a34ca11bf31a4c3995573a128cf5838a6763bac86eb4cbaf509ade9b6a83a24369'
                   '5b77c587cf2ffb60acf1d9eb43330983548c7e81a53e0ffd2b04962a99441a0000d631ff77c245c7062afc2c8368d996a2456496d42dcb658f330e5083e5e029'
                   'bc7b70863929737346fe6757373897391b43af36bb6884d5351a95aca0f9120f2d2cf9b9c2c6426a440c6b394e9fb334c280711d64081563322a834ecdfb2ba6')
_replacesarchkernel=("${_replacesarchkernel[@]/\%/${pkgbase#linux-libre}}")
_replacesoldkernels=("${_replacesoldkernels[@]/\%/${pkgbase#linux-libre}}")
_replacesoldmodules=("${_replacesoldmodules[@]/\%/${pkgbase#linux-libre}}")

case "$CARCH" in
  i686) KARCH=x86;CROSS_COMPILE=x86_64-pc-linux-gnu-;;
  armv7h) KARCH=arm64;CROSS_COMPILE=aarch64-linux-gnu-;;
esac

export STRIP=${CROSS_COMPILE}strip
export KBUILD_BUILD_HOST=parabola
export KBUILD_BUILD_USER=$pkgbase
export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"

prepare() {
  cd $_srcname

  if [ "${_srcname##*-}" != "$pkgver" ]; then
    echo "Applying upstream patch..."
    patch -Np1 < "../patch-${_srcname##*-}-gnu-$pkgver-gnu"
  fi

  echo "Adding freedo as boot logo..."
  install -m644 -t drivers/video/logo \
    ../logo_linux_{clut224.ppm,vga16.ppm,mono.pbm}

  echo "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
      echo "Applying patch $src_armv7h..."
      patch -Np1 < "../$src_armv7h"
    done
  fi

  if [ "$CARCH" = "i686" ]; then
    local src_i686
    for src_i686 in "${source_i686[@]}"; do
      src_i686="${src_i686%%::*}"
      src_i686="${src_i686##*/}"
      [[ $src_i686 = *.patch ]] || continue
      echo "Applying patch $src_i686..."
      patch -Np1 < "../$src_i686"
    done
  fi

  local src
  for src in "${source[@]}"; do
    src="${src%%::*}"
    src="${src##*/}"
    [[ $src = *.patch ]] || continue
    echo "Applying patch $src..."
    patch -Np1 < "../$src"
  done

  echo "Setting config..."
  case "$CARCH" in
  i686) cp ../config.x86_64 .config;;
  # config.aarch64 comes straight from Arch Linux ARM and doesn't have the
  # compatibility for 32bit rootfs enabled. This makes maintenance faster than
  # having to modify the configuration file by hand at each new kernel release.
  armv7h) cp ../config.aarch64 .config;echo 'CONFIG_COMPAT=y' >> .config;;
  esac
  make ARCH=$KARCH CROSS_COMPILE=$CROSS_COMPILE olddefconfig

  make ARCH=$KARCH CROSS_COMPILE=$CROSS_COMPILE -s kernelrelease > version
  echo "Prepared $pkgbase version $(<version)"
}

build() {
  cd $_srcname
  make ARCH=$KARCH CROSS_COMPILE=$CROSS_COMPILE all
  make ARCH=$KARCH CROSS_COMPILE=$CROSS_COMPILE htmldocs
}

_package() {
  pkgdesc="The $pkgdesc kernel and modules"
  depends=(coreutils kmod initramfs)
  optdepends=('wireless-regdb: to set the correct wireless channels of your country'
              'linux-libre-firmware: firmware images needed for some devices')
  provides=(VIRTUALBOX-GUEST-MODULES WIREGUARD-MODULE)
  replaces=(virtualbox-guest-modules-arch wireguard-arch)
  provides+=("${_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"

  echo "Installing boot image..."
  # systemd expects to find the kernel here to allow hibernation
  # https://github.com/systemd/systemd/commit/edda44605f06a41fb86b7ab8128dcf99161d2344
  # The default image target is Image.gz on arm64 but some u-boot
  # configurations and/or versions don't support that, so we use Image instead.
  if [ "$KARCH" = "arm64" ]; then
    install -Dm644 arch/$KARCH/boot/Image "$modulesdir/vmlinuz"
  else
    install -Dm644 "$(make ARCH=$KARCH CROSS_COMPILE=$CROSS_COMPILE -s image_name)" "$modulesdir/vmlinuz"
  fi

  # Used by mkinitcpio to name the kernel
  echo "$pkgbase" | install -Dm644 /dev/stdin "$modulesdir/pkgbase"

  echo "Installing modules..."
  make ARCH=$KARCH CROSS_COMPILE=$CROSS_COMPILE INSTALL_MOD_PATH="$pkgdir/usr" INSTALL_MOD_STRIP=1 modules_install

  # remove build and source links
  rm "$modulesdir"/{source,build}

  if [ "$CARCH" = "armv7h" ]; then
    echo "Installing device tree binaries..."
    make ARCH=$KARCH CROSS_COMPILE=$CROSS_COMPILE INSTALL_DTBS_PATH="$pkgdir/boot/dtbs/$pkgbase" dtbs_install

    # armv7h presets only work with ALL_kver=$kernver
    backup=("etc/mkinitcpio.d/$pkgbase.preset")
    echo "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
}

_package-headers() {
  pkgdesc="Headers and scripts for building modules for the $pkgdesc kernel"
  depends=(pahole)
  provides=("${_replacesarchkernel[@]/%/-headers=$pkgver}")
  conflicts=("${_replacesarchkernel[@]/%/-headers}" "${_replacesoldkernels[@]/%/-headers}")
  replaces=("${_replacesarchkernel[@]/%/-headers}" "${_replacesoldkernels[@]/%/-headers}")

  cd $_srcname
  local builddir="$pkgdir/usr/lib/modules/$(<version)/build"

  echo "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

  # required when STACK_VALIDATION is enabled
  if [[ -e tools/objtool/objtool ]]; then
    install -Dt "$builddir/tools/objtool" tools/objtool/objtool
  fi

  # required when DEBUG_INFO_BTF_MODULES is enabled
  if [[ -e tools/bpf/resolve_btfids/resolve_btfids ]]; then
    install -Dt "$builddir/tools/bpf/resolve_btfids" tools/bpf/resolve_btfids/resolve_btfids
  fi

  echo "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

  # https://bugs.archlinux.org/task/13146
  install -Dt "$builddir/drivers/media/i2c" -m644 drivers/media/i2c/msp3400-driver.h

  # https://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

  # https://bugs.archlinux.org/task/71392
  install -Dt "$builddir/drivers/iio/common/hid-sensors" -m644 drivers/iio/common/hid-sensors/*.h

  echo "Installing KConfig files..."
  find . -name 'Kconfig*' -exec install -Dm644 {} "$builddir/{}" \;

  echo "Removing unneeded architectures..."
  local arch
  for arch in "$builddir"/arch/*/; do
    [[ $arch = */$KARCH/ ]] && continue
    echo "Removing $(basename "$arch")"
    rm -r "$arch"
  done

  echo "Removing documentation..."
  rm -r "$builddir/Documentation"

  echo "Removing broken symlinks..."
  find -L "$builddir" -type l -printf 'Removing %P\n' -delete

  echo "Removing loose objects..."
  find "$builddir" -type f -name '*.o' -printf 'Removing %P\n' -delete

  echo "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)

  echo "Stripping vmlinux..."
  ${STRIP} -v $STRIP_STATIC "$builddir/vmlinux"

  echo "Adding symlink..."
  mkdir -p "$pkgdir/usr/src"
  ln -sr "$builddir" "$pkgdir/usr/src/$pkgbase"
}

_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"

  echo "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)

  echo "Adding symlink..."
  mkdir -p "$pkgdir/usr/share/doc"
  ln -sr "$builddir/Documentation" "$pkgdir/usr/share/doc/$pkgbase"
}

_package-chromebook() {
  pkgdesc="Experimental $pkgdesc kernel sign for Veyron Chromebooks"
  depends=(linux-libre-64=$pkgver)
  provides+=("linux-libre-chromebook=$pkgver") # TODO: these provides, conflicts, repalces,
  conflicts+=('linux-libre-chromebook')        #       will not needed once parabola has
  replaces+=('linux-libre-chromebook')         #       an 'aarch64' build target and repos
  install=linux-libre-chromebook.install

  cd $_srcname

  cp ../kernel.its .
  mkimage -D "-I dts -O dtb -p 2048" -f kernel.its kernel.signed
  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

  echo "Creating kernel sign..."
  vbutil_kernel \
    --pack vmlinux.kpart \
    --version 1 \
    --vmlinuz kernel.signed \
    --arch aarch64 \
    --keyblock ../kernel.keyblock \
    --signprivate ../kernel_data_key.vbprivk \
    --config cmdline \
    --bootloader bootloader.bin

  echo "Installing kernel sign..."
  mkdir -p "$pkgdir/boot"
  cp vmlinux.kpart "$pkgdir/boot"
}

pkgname=("$pkgbase" "$pkgbase-headers" "$pkgbase-docs")
# The chromebook package is disabled until the following error is fixed:
# |  ==> Starting package_linux-libre-64-chromebook()...
# |  FATAL ERROR: Couldn't open "arch/arm/boot/zImage": No such file or directory
# |  mkimage: Can't read kernel.signed.tmp: Invalid argument
# [[ $CARCH = armv7h ]] && pkgname+=("$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: