# Maintainer: graysky <graysky@archlinux.us>
# Maintainer: Kevin Mihelich <kevin@archlinuxarm.org>
# Maintainer: Oleg Rakhmanov <oleg@archlinuxarm.org>
# Maintainer: Dave Higham <pepedog@archlinuxarm.org>
# Contributer: Jan Alexander Steffens (heftig) <heftig@archlinux.org>

pkgbase=linux-rpi
_commit=655fc658a15ae7a6f37103754adb39ba52a9a14e
_srcname=linux-${_commit}
_kernelname=${pkgbase#linux}
_regen=
pkgver=6.1.47
pkgrel=1
pkgdesc='Linux'
url="http://www.kernel.org/"
arch=(armv7h aarch64)
license=(GPL2)
makedepends=(
  bc
  kmod
  inetutils
)
options=('!strip')
source_armv7h=('config' 'config.txt')
source_aarch64=('config8' 'config8.txt')
source=("linux-$pkgver-${_commit:0:10}.tar.gz::https://github.com/raspberrypi/linux/archive/${_commit}.tar.gz"
        cmdline.txt
        0001-Make-proc-cpuinfo-consistent-on-arm64-and-arm.patch
        linux.preset
        60-linux.hook
        90-linux.hook
        archarm.diffconfig
)
md5sums=('01e6c3157827bf17fe8097671a96d565'
         '3bab7426d8c8818dda8353da3892a41f'
         'f66a7ea3feb708d398ef57e4da4815e9'
         '86d4a35722b5410e3b29fc92dae15d4b'
         '0a5f16bfec6ad982a2f6782724cca8ba'
         '441ec084c47cddc53e592fb0cbce4edf'
         'c8f84694321e249492c80149833671d7')
md5sums_armv7h=('b7517575796de6d5d19003560b965b29'
                'a99311daa39248cfc9b6541a0a0a5f09')
md5sums_aarch64=('94f6a57768c36a88d8740c61bc44e698'
                 '7e4403dea857e40005bf76beda9927ff')

# setup vars
if [[ $CARCH == "armv7h" ]]; then
  _kernel=kernel7.img KARCH=arm _image=zImage _config=config _bconfig=config.txt
elif [[ $CARCH == "aarch64" ]]; then
  _kernel=kernel8.img KARCH=arm64 _image=Image _config=config8 _bconfig=config8.txt
fi

_make() {
  test -s version
  make KERNELRELEASE="$(<version)" "$@"
}

prepare() {
  cd "${srcdir}/${_srcname}"

  # consistent behavior of lscpu on arm/arm64
  patch -p1 -i ../0001-Make-proc-cpuinfo-consistent-on-arm64-and-arm.patch

  echo "Setting version..."
  echo "-$pkgrel" > localversion.10-pkgrel
  echo "${pkgbase#linux}" > localversion.20-pkgname

  if [[ $_regen -eq 1 ]]; then
    # useful on two point releases to keep shit straight
    echo "Applying custom shit to bcm2711_defconfig"
    make bcm2711_defconfig
    cat ../archarm.diffconfig >> .config
    make oldconfig
    if [[ $CARCH == "armv7h" ]]; then
      # https://archlinuxarm.org/forum/viewtopic.php?f=23&t=16373
      scripts/config --enable CONFIG_BCM2835_THERMAL
      # workaround OOM killer issue
      # https://github.com/raspberrypi/linux/issues/5395
      # https://archlinuxarm.org/forum/viewtopic.php?f=23&t=16377
      scripts/config --disable CONFIG_LRU_GEN_ENABLED
    fi
    sed '/^CONFIG_LOCALVERSION=/s,.*$,CONFIG_LOCALVERSION="-ARCH",' .config >$startdir/newconfig.$_config
    echo "verify that newconfig.$_config is fit for purpose then redefine $_config"
    exit
  else
    make bcm2711_defconfig
    make -s kernelrelease | sed 's/rpi-.*$/rpi-ARCH/' > version
    make mrproper
    echo "Setting config..."
    cp ../"$_config" .config
    _make olddefconfig
    diff -u ../"$_config" .config || :
    echo "Prepared $pkgbase version $(<version)"
  fi
}

build() {
  cd "${srcdir}/${_srcname}"

  _make "$_image" modules dtbs
}

_package() {
  pkgdesc="RPi Foundation patched Linux kernel and modules"
  depends=(
    coreutils
    firmware-raspberrypi
    kmod
    linux-firmware
    'mkinitcpio>=0.7'
  )
  optdepends=(
    'wireless-regdb: to set the correct wireless channels of your country'
  )
  provides=(
    linux="${pkgver}"
    WIREGUARD-MODULE
  )
  conflicts=(
    linux
    uboot-raspberrypi
  )
  replaces=(
    linux-raspberrypi-latest
    linux-raspberrypi4
  )
  install=${pkgname}.install
  backup=(
    boot/config.txt
    boot/cmdline.txt
  )

  cd "${srcdir}/${_srcname}"
  local modulesdir="$pkgdir/usr/lib/modules/$(<version)"

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

  echo "Installing modules..."
  _make INSTALL_MOD_PATH="$pkgdir/usr" INSTALL_MOD_STRIP=1 \
    DEPMOD=/doesnt/exist modules_install  # Suppress depmod

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

  echo "Installing Arch ARM specific stuff..."
  mkdir -p "${pkgdir}"/boot
  make INSTALL_DTBS_PATH="${pkgdir}/boot" dtbs_install

  if [[ $CARCH == "aarch64" ]]; then
    # drop hard-coded devicetree=foo.dtb in /boot/config.txt for
    # autodetected load of supported of models at boot
    find "${pkgdir}/boot/broadcom" -type f -print0 | xargs -0 mv -t "${pkgdir}/boot"
    rmdir "${pkgdir}/boot/broadcom"
  fi

  cp arch/$KARCH/boot/$_image "${pkgdir}/boot/$_kernel"
  cp arch/$KARCH/boot/dts/overlays/README "${pkgdir}/boot/overlays"
  install -m644 ../$_bconfig "${pkgdir}/boot/config.txt"
  install -m644 ../cmdline.txt "${pkgdir}/boot"

  # sed expression for following substitutions
  local _subst="
    s|%PKGBASE%|${pkgbase}|g
    s|%KERNVER%|$(<version)|g
  "

  # install mkinitcpio preset file
  sed "${_subst}" ../linux.preset |
    install -Dm644 /dev/stdin "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"

  # install pacman hooks
  sed "${_subst}" ../60-linux.hook |
    install -Dm644 /dev/stdin "${pkgdir}/usr/share/libalpm/hooks/60-${pkgbase}.hook"
  sed "${_subst}" ../90-linux.hook |
    install -Dm644 /dev/stdin "${pkgdir}/usr/share/libalpm/hooks/90-${pkgbase}.hook"
}

_package-headers() {
  pkgdesc="RPi Foundation header and scripts for building modules for Linux kernel"
  provides=("linux-headers=${pkgver}")
  conflicts=('linux-headers')
  replaces=('linux-raspberrypi-latest-headers' 'linux-raspberrypi4-headers')

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

  echo "Installing build files..."
  install -Dt "$builddir" -m644 .config Makefile Module.symvers System.map \
    localversion.* version
  install -Dt "$builddir/kernel" -m644 kernel/Makefile
  install -Dt "$builddir/arch/$KARCH" -m644 "arch/$KARCH/Makefile"
  cp -t "$builddir" -a scripts

  # add xfs and shmem for aufs building
  mkdir -p "$builddir"/{fs/xfs,mm}

  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
    if [[ $CARCH == "aarch64" ]]; then
      [[ $_arch = */"$KARCH"/ || $_arch == */arm/ ]] && continue
    else
      [[ $_arch = */"$KARCH"/ ]] && continue
    fi
    echo "Removing $(basename "$_arch")"
    rm -r "$_arch"
  done

  echo "Symlinking common aliases..."
  # https://archlinuxarm.org/forum/viewtopic.php?f=60&t=16354
  ln -sr arm "$builddir/arch/armv7h"
  ln -sr arm "$builddir/arch/armv7l"
  ln -sr arm64 "$builddir/arch/aarch64"

  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 "$(file -Sib "$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)

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

pkgname=("${pkgbase}" "${pkgbase}-headers")
for _p in ${pkgname[@]}; do
  eval "package_${_p}() {
    _package${_p#${pkgbase}}
  }"
done