# Maintainer: graysky <graysky AT archlinux DOT us>
# Contributor: Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>

### BUILD OPTIONS
# Set these variables to ANYTHING that is not null to enable them

# Tweak kernel options prior to a build via nconfig
_makenconfig=

# Optionally select a sub architecture by number if building in a clean chroot
# Leaving this entry blank will require user interaction during the build
# which will cause a failure to build if using makechrootpkg. Note that the
# generic (default) option is 32.
#
# Note - the march=native option is unavailable by this method, use the nconfig
# and manually select it.
#
#  1. AMD Opteron/Athlon64/Hammer/K8 (MK8)
#  2. AMD Opteron/Athlon64/Hammer/K8 with SSE3 (MK8SSE3)
#  3. AMD 61xx/7x50/PhenomX3/X4/II/K10 (MK10)
#  4. AMD Barcelona (MBARCELONA)
#  5. AMD Bobcat (MBOBCAT)
#  6. AMD Jaguar (MJAGUAR)
#  7. AMD Bulldozer (MBULLDOZER)
#  8. AMD Piledriver (MPILEDRIVER)
#  9. AMD Steamroller (MSTEAMROLLER)
#  10. AMD Excavator (MEXCAVATOR)
#  11. AMD Zen (MZEN)
#  12. AMD Zen 2 (MZEN2)
#  13. Intel P4 / older Netburst based Xeon (MPSC)
#  14. Intel Atom (MATOM)
#  15. Intel Core 2 (MCORE2)
#  16. Intel Nehalem (MNEHALEM)
#  17. Intel Westmere (MWESTMERE)
#  18. Intel Silvermont (MSILVERMONT)
#  19. Intel Goldmont (MGOLDMONT)
#  20. Intel Goldmont Plus (MGOLDMONTPLUS)
#  21. Intel Sandy Bridge (MSANDYBRIDGE)
#  22. Intel Ivy Bridge (MIVYBRIDGE)
#  23. Intel Haswell (MHASWELL)
#  24. Intel Broadwell (MBROADWELL)
#  25. Intel Skylake (MSKYLAKE)
#  26. Intel Skylake X (MSKYLAKEX)
#  27. Intel Cannon Lake (MCANNONLAKE)
#  28. Intel Ice Lake (MICELAKE)
#  29. Intel Cascade Lake (MCASCADELAKE)
#  30. Intel Cooper Lake (MCOOPERLAKE)
#  31. Intel Tiger Lake (MTIGERLAKE)
#  32. Generic-x86-64 (GENERIC_CPU)
#  33. Native optimizations autodetected by GCC (MNATIVE)

_subarch=

# Compile ONLY used modules to VASTLYreduce the number of modules built
# and the build time.
#
# To keep track of which modules are needed for your specific system/hardware,
# give module_db script a try: https://aur.archlinux.org/packages/modprobed-db
# This PKGBUILD read the database kept if it exists
#
# More at this wiki page ---> https://wiki.archlinux.org/index.php/Modprobed-db
_localmodcfg=

### IMPORTANT: Do no edit below this line unless you know what you're doing

pkgbase=linux-ck
pkgver=5.10.4
pkgrel=4
_ckpatchversion=1
arch=(x86_64)
url="https://wiki.archlinux.org/index.php/Linux-ck"
license=(GPL2)
makedepends=(
  bc kmod libelf        cpio perl tar xz
)
options=('!strip')
_ckpatch="patch-5.10-ck${_ckpatchversion}"
_gcc_more_v='20201113'
source=(
  "https://www.kernel.org/pub/linux/kernel/v5.x/linux-$pkgver.tar".{xz,sign}
  config         # the main kernel config file
  "enable_additional_cpu_optimizations-$_gcc_more_v.tar.gz::https://github.com/graysky2/kernel_gcc_patch/archive/$_gcc_more_v.tar.gz"
  "http://ck.kolivas.org/patches/5.0/5.10/5.10-ck${_ckpatchversion}/$_ckpatch.xz"
  0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
  0002-Bluetooth-Fix-attempting-to-set-RPA-timeout-when-uns.patch
  0003-HID-quirks-Add-Apple-Magic-Trackpad-2-to-hid_have_sp.patch
  0004-drm-amd-display-Add-get_dig_frontend-implementation-.patch
  0005-btrfs-Fix-500-2000-performance-regression-w-5.10.patch
  0006-iwlwifi-Fix-regression-from-UDP-segmentation-support.patch
  0007-ALSA-hda-hdmi-fix-locking-in-silent_stream_disable.patch
)
validpgpkeys=(
  'ABAF11C65A2970B130ABE3C479BE3E4300411886'  # Linus Torvalds
  '647F28654894E3BD457199BE38DBBDC86092693E'  # Greg Kroah-Hartman
)
b2sums=('57f6d719451aacfd298452703ae02e6188885500e8cdf18fffa6b9967b0934a23cd378ab4c49b76ccb2f7a9012d6aa7ff1349d488cb31e40924be2f27b244cec'
        'SKIP'
        'cb3a58e4eef8395b75887d94a84bba25f05fbec8f576a791623057a190a1d51b412a19ecf1b600ac3f9f6c46968eb0e130d571743e61afc231a97146ee4b52d0'
        '7f1eb5938472f57748216bd00e0c875feab99fc1c5cb89babfea467ee30ca5c8e9fc5a691efe2e602bef1ea79820c5383822d7cec354b48d23321ccda8ee8127'
        '067f3389124fdd937ca69e9e9568b1b3194791960a093e81037051eb6d25e80b40bf7f60c61373ac9e92bff9db760766009b1e6f9ee8429a883bb7fce2d60f8a'
        '7d2ef86a15ead6c946051c117a8ed97056e92a25a274455c5cc62ec65ff92bda7a50032b32c8019180f233a54e778becc45751741ae4d87db8f56ef520ca1e83'
        '8ea9d2b7809728c3de05768fea5d8838fe20de8aaaed9106f26c0e8fc051921668d0c31345f200d06005403dec565690f828dbbcd38504079fe6fccbf742be61'
        'd361b313a3dcd761833b8e2e40201df5e5b93c472e8a06f4684feb24d6e174405e6e4328dc0c449b9b0263e87224b3e1f4a52c873b666a93055979c9d2e2bf59'
        'a0eb84f3be3ce81c8faebfcef5cf41aa21fb3c49a20c5d6a50396b7aa50a6a88f5509a13541d2db3be3fc422e59dc102d18ad9934471629c627fd96bfa79a091'
        '2853fa5257b96b11bcbf60ed68df09938ebb15f81c1bb6aa763c721c4e55f440fd27f9a6b49e8f9a1788948928299810f9e8ea43f0759b06cae3dd140902f93e'
        '46a30c86206717fe6804d8e88693b90382b07fdad91d8fd7220e398e41f87a4b5cb5be70285241a3fc81c62ced6021f1710ce0426f3161285c254db9e5484d86'
        'eec26b472efda62e27d26c2033158e970a5eadb30d38fc4de59c36fafe53efc1e220b7d57189abcd5a2697d242df8475cf2eebfd1ad6373804b5456dbcc14098')

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

prepare() {
  cd linux-${pkgver}

  echo "Setting version..."
  scripts/setlocalversion --save-scmversion
  echo "-$pkgrel" > localversion.10-pkgrel
  echo "${pkgbase#linux}" > localversion.20-pkgname

  local src
  for src in "${source[@]}"; do
    src="${src%%::*}"
    src="${src##*/}"
    [[ $src = 0*.patch ]] || continue
    echo "Applying patch $src..."
    patch -Np1 < "../$src"
  done

  echo "Setting config..."
  cp ../config .config

  # disable CONFIG_DEBUG_INFO=y at build time otherwise memory usage blows up
  # and can easily overwhelm a system with 32 GB of memory using a tmpfs build
  # partition ... this was introduced by FS#66260, see:
  # https://git.archlinux.org/svntogit/packages.git/commit/trunk?h=packages/linux&id=663b08666b269eeeeaafbafaee07fd03389ac8d7
  sed -i -e 's/CONFIG_CGROUP_BPF=y/# CONFIG_CGROUP_BPF is not set/' \
      -i -e 's/CONFIG_BPF_LSM=y/# CONFIG_BPF_LSM is not set/' \
      -i -e 's/CONFIG_USERMODE_DRIVER=y/# CONFIG_BPF_PRELOAD is not set/' \
      -i -e '/CONFIG_BPF_PRELOAD=y/d' \
      -i -e '/CONFIG_BPF_PRELOAD_UMD=m/d' \
      -i -e '/CONFIG_BPF_STREAM_PARSER=y/g' \
      -i -e 's/CONFIG_BPF_LIRC_MODE2=y/# CONFIG_BPF_LIRC_MODE2 is not set/' \
      -i -e 's/CONFIG_DEBUG_INFO=y/# CONFIG_DEBUG_INFO is not set/' \
      -i -e '/# CONFIG_DEBUG_INFO_REDUCED is not set/d' \
      -i -e '/# CONFIG_DEBUG_INFO_COMPRESSED is not set/d' \
      -i -e '/# CONFIG_DEBUG_INFO_SPLIT is not set/d' \
      -i -e '/CONFIG_DEBUG_INFO_DWARF4=y/d' \
      -i -e '/CONFIG_DEBUG_INFO_BTF=y/d' \
      -i -e '/# CONFIG_GDB_SCRIPTS is not set/d' \
      -i -e 's/CONFIG_BPF_KPROBE_OVERRIDE=y/# CONFIG_BPF_KPROBE_OVERRIDE is not set/' ./.config

  # https://bbs.archlinux.org/viewtopic.php?pid=1824594#p1824594
  sed -i -e 's/# CONFIG_PSI_DEFAULT_DISABLED is not set/CONFIG_PSI_DEFAULT_DISABLED=y/' ./.config

  # https://bbs.archlinux.org/viewtopic.php?pid=1863567#p1863567
  sed -i -e '/CONFIG_LATENCYTOP=/ s,y,n,' \
      -i -e '/CONFIG_SCHED_DEBUG=/ s,y,n,' ./.config

  # FS#66613
  # https://bugzilla.kernel.org/show_bug.cgi?id=207173#c6
  sed -i -e 's/CONFIG_KVM_WERROR=y/# CONFIG_KVM_WERROR is not set/' ./.config

  # fix naming schema in EXTRAVERSION of ck patch set
  sed -i -re "s/^(.EXTRAVERSION).*$/\1 = /" "../${_ckpatch}"

  # ck patchset itself
  echo "Patching with ck patchset..."
  patch -Np1 -i ../"${_ckpatch}"

  # non-interactively apply ck1 default options
  # this isn't redundant if we want a clean selection of subarch below
  make olddefconfig

  # https://github.com/graysky2/kernel_gcc_patch
  # make sure to apply after olddefconfig to allow the next section
  echo "Patching to enable GCC optimization for other uarchs..."
  patch -Np1 -i "$srcdir/kernel_gcc_patch-$_gcc_more_v/enable_additional_cpu_optimizations_for_gcc_v10.1+_kernel_v5.8+.patch"

  if [ -n "$_subarch" ]; then
    # user wants a subarch so apply choice defined above interactively via 'yes'
    yes "$_subarch" | make oldconfig
  else
    # no subarch defined so allow user to pick one
    make oldconfig
  fi

  ### Optionally load needed modules for the make localmodconfig
  # See https://aur.archlinux.org/packages/modprobed-db
    if [ -n "$_localmodcfg" ]; then
      if [ -f $HOME/.config/modprobed.db ]; then
        echo "Running Steven Rostedt's make localmodconfig now"
        make LSMOD=$HOME/.config/modprobed.db localmodconfig
      else
        echo "No modprobed.db data found"
        exit
      fi
    fi

  make -s kernelrelease > version
  echo "Prepared $pkgbase version $(<version)"

  [[ -z "$_makenconfig" ]] || make nconfig

  # save configuration for later reuse
  cat .config > "${startdir}/config.last"

  # uncomment if you want to build with distcc
  ### sed -i '/HAVE_GCC_PLUGINS/d' arch/x86/Kconfig
}

build() {
  cd linux-${pkgver}
  make all
}

_package() {
  pkgdesc="The ${pkgbase/linux/Linux} kernel and modules with the ck1 patchset featuring MuQSS CPU scheduler"
  depends=(coreutils kmod initramfs)
  optdepends=('crda: to set the correct wireless channels of your country'
              'linux-firmware: firmware images needed for some devices')
  provides=(VIRTUALBOX-GUEST-MODULES WIREGUARD-MODULE)
  #groups=('ck-generic')

  cd linux-${pkgver}

  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
  #install -Dm644 "$(make -s image_name)" "$modulesdir/vmlinuz"
  #
  # hard-coded path in case user defined CC=xxx for build which causes errors
  # see this FS https://bugs.archlinux.org/task/64315
  install -Dm644 arch/x86/boot/bzImage "$modulesdir/vmlinuz"

  # 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 modules_install
  # not needed since not building with CONFIG_DEBUG_INFO=y

  make INSTALL_MOD_PATH="$pkgdir/usr" modules_install

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

_package-headers() {
  pkgdesc="Headers and scripts for building modules for ${pkgbase/linux/Linux} kernel"
  depends=('linux-ck') # added to keep kernel and headers packages matched
  #groups=('ck-generic')

  cd linux-${pkgver}
  local builddir="$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 "$builddir/arch/x86" -m644 arch/x86/Makefile
  cp -t "$builddir" -a scripts

  # add objtool for external module building and enabled VALIDATION_STACK option
  install -Dt "$builddir/tools/objtool" tools/objtool/objtool

  # 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/x86" -a arch/x86/include
  install -Dt "$builddir/arch/x86/kernel" -m644 arch/x86/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

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

  echo "Removing unneeded architectures..."
  local arch
  for arch in "$builddir"/arch/*/; do
    [[ $arch = */x86/ ]] && 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"
  # not needed since not building with CONFIG_DEBUG_INFO=y

  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() {
    $(declare -f "_package${_p#$pkgbase}")
    _package${_p#$pkgbase}
  }"
done

# vim:set ts=8 sts=2 sw=2 et: