# Maintainer: Leonidas Spyropoulos <artafinde AT gmail DOT com>
# Credit to graysky for shamelessly copying PKGBUILD from linux-ck

### BUILD OPTIONS
# Set the next two variables to ANYTHING that is not null to enable them

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

# Only compile active modules to VASTLY reduce 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 a try: https://aur.archlinux.org/packages/modprobed-db
# This PKGBUILD reads the database kept if it exists
#
# More at this wiki page ---> https://wiki.archlinux.org/index.php/Modprobed-db
_localmodcfg=

# Optionally select a sub architecture by number or leave blank which will
# require user interaction during the build. Note that the generic (default)
# option is 36.
#
#  1. AMD Opteron/Athlon64/Hammer/K8 (MK8)
#  2. AMD Opteron/Athlon64/Hammer/K8 with SSE3 (MK8SSE3) (NEW)
#  3. AMD 61xx/7x50/PhenomX3/X4/II/K10 (MK10) (NEW)
#  4. AMD Barcelona (MBARCELONA) (NEW)
#  5. AMD Bobcat (MBOBCAT) (NEW)
#  6. AMD Jaguar (MJAGUAR) (NEW)
#  7. AMD Bulldozer (MBULLDOZER) (NEW)
#  8. AMD Piledriver (MPILEDRIVER) (NEW)
#  9. AMD Steamroller (MSTEAMROLLER) (NEW)
#  10. AMD Excavator (MEXCAVATOR) (NEW)
#  11. AMD Zen (MZEN) (NEW)
#  12. AMD Zen 2 (MZEN2) (NEW)
#  13. AMD Zen 3 (MZEN3) (NEW)
#  14. Intel P4 / older Netburst based Xeon (MPSC)
#  15. Intel Core 2 (MCORE2)
#  16. Intel Atom (MATOM)
#  17. Intel Nehalem (MNEHALEM) (NEW)
#  18. Intel Westmere (MWESTMERE) (NEW)
#  19. Intel Silvermont (MSILVERMONT) (NEW)
#  20. Intel Goldmont (MGOLDMONT) (NEW)
#  21. Intel Goldmont Plus (MGOLDMONTPLUS) (NEW)
#  22. Intel Sandy Bridge (MSANDYBRIDGE) (NEW)
#  23. Intel Ivy Bridge (MIVYBRIDGE) (NEW)
#  24. Intel Haswell (MHASWELL) (NEW)
#  25. Intel Broadwell (MBROADWELL) (NEW)
#  26. Intel Skylake (MSKYLAKE) (NEW)
#  27. Intel Skylake X (MSKYLAKEX) (NEW)
#  28. Intel Cannon Lake (MCANNONLAKE) (NEW)
#  29. Intel Ice Lake (MICELAKE) (NEW)
#  30. Intel Cascade Lake (MCASCADELAKE) (NEW)
#  31. Intel Cooper Lake (MCOOPERLAKE) (NEW)
#  32. Intel Tiger Lake (MTIGERLAKE) (NEW)
#  33. Intel Sapphire Rapids (MSAPPHIRERAPIDS) (NEW)
#  34. Intel Rocket Lake (MROCKETLAKE) (NEW)
#  35. Intel Alder Lake (MALDERLAKE) (NEW)
#  36. Generic-x86-64 (GENERIC_CPU)
#  37. Generic-x86-64-v2 (GENERIC_CPU2) (NEW)
#  38. Generic-x86-64-v3 (GENERIC_CPU3) (NEW)
#  39. Generic-x86-64-v4 (GENERIC_CPU4) (NEW)
#  40. Intel-Native optimizations autodetected by GCC (MNATIVE_INTEL) (NEW)
#  41. AMD-Native optimizations autodetected by GCC (MNATIVE_AMD) (NEW)
_subarch=

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

pkgbase=linux-gc
pkgver=5.12.15
pkgrel=1
pkgdesc='Linux'
url="https://cchalpha.blogspot.co.uk/"
arch=(x86_64)
license=(GPL2)
makedepends=(bc kmod libelf pahole cpio xmlto python-sphinx python-sphinx_rtd_theme graphviz imagemagick git)
options=('!strip')
_srcname=linux-${pkgver}
_arch_config_commit=aa159a607fdfdc3cbf90ccd05ecc43d4bff96729
_bmqversion=5.12-r1
_bmq_patch="prjc_v${_bmqversion}.patch"
_gcc_more_v=20210616
source=(
  "https://www.kernel.org/pub/linux/kernel/v5.x/linux-$pkgver.tar".{xz,sign}
  "config::https://raw.githubusercontent.com/archlinux/svntogit-packages/${_arch_config_commit}/trunk/config"
  "${_bmq_patch}::https://gitlab.com/alfredchen/projectc/raw/master/${_bmqversion%-*}/${_bmq_patch}"
  "more-uarches-$_gcc_more_v.tar.gz::https://github.com/graysky2/kernel_compiler_patch/archive/$_gcc_more_v.tar.gz"
  "0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch::https://github.com/archlinux/linux/commit/cea01833528ae4d26c26ba6d0474c90612b644af.patch"
  "0002-x86-setup-Consolidate-early-memory-reservations.patch::https://github.com/archlinux/linux/commit/8bd9e7d22ae0676f6dd2af4ea385111c052e745e.patch"
  "0003-x86-setup-Merge-several-reservations-of-start-of-mem.patch::https://github.com/archlinux/linux/commit/c1f1e2a2781a0c0ead90df1e873ba7f6aaad35ed.patch"
  "0004-x86-setup-Move-trim_snb_memory-later-in-setup_arch-t.patch::https://github.com/archlinux/linux/commit/743e1a2b9b6e79fb237ac84e20dc4411217deb24.patch"
  "0005-x86-setup-always-reserve-the-first-1M-of-RAM.patch::https://github.com/archlinux/linux/commit/f2c34dfc0b3903b5ebed62a7a8ec7c27c7c203d0.patch"
  "0006-x86-setup-remove-CONFIG_X86_RESERVE_LOW-and-reservel.patch::https://github.com/archlinux/linux/commit/24e66ca483c2908d24c82fd760f6ca9243fd9020.patch"
  "0007-x86-crash-remove-crash_reserve_low_1M.patch::https://github.com/archlinux/linux/commit/c0f0017776e7daff716b135824fb4ddb4cf14507.patch"
  "prjc-fix-compilation-error.patch::https://gitlab.com/alfredchen/linux-prjc/uploads/b1121adfd2d2a2c610a1a8d611947d8c/0001-prjc-fix-compilation-error.patch"
)
validpgpkeys=(
  'ABAF11C65A2970B130ABE3C479BE3E4300411886'  # Linus Torvalds
  '647F28654894E3BD457199BE38DBBDC86092693E'  # Greg Kroah-Hartman
)
b2sums=('2d94859080bba686786b690733d6df4a17f6183c690854545b87d784d16fbc5050fc07be08b2360cc1d0a6fe11bd8f18add68c893d92bb52e10bb0f61ff4eb76'
        'SKIP'
        'e7b85b8015414c2405c35f811cc3d201e10fb717e94f4c54c921d4a51dafcd61a2ac61695cf4ad5f51a2dcf5fda0558d99a896ec6478f47e7577c7207a4f7a94'
        '77a1646ffbc67ed88af564b73cf63f0374772bdc1075e771a93ee4fe257b94cb3766a4842898b48f4343458d0b507229182220c7daeb5532df610b964c6640e7'
        '8eed6c5ac182266a254ad111389f2236e6664341c56d8e4854e722d7323e526d2caa5e5119060fd3cbc119a0682a7ef47fb8a0000cf83acbdfe3a0d4a5446e5d'
        '767ee2dc194b8dcf6fbfd90524f60a2847646549de864a89772d6cc49d9717bebb580082ea3c9f5bcd36e1b367b9434c97da6bf05872362cc2ceeb630bab6438'
        'd5ca4a6c4c2e286b75907786c1b4e55f5781218ba4997aa118e99cbfe96e0d9cd9683d804811f85f9af0a83844f68e19909aed0643924406a62e573e4214c322'
        'ada58e3c4ea1e251e479faba82389fec609de63f58d756b3848d158a033fcbfc8e33f5055cb47e6c57549976ed8acff11a813a68c1d8a3bacc42b215590f92ef'
        'cfc0875c74b592c149f5f7f8fe8c349256c70b4c0d512b450e4dfdb84e1a59c1489ea207fe7a09b51134a73f959a85cce49d6a71f1acaa2137c8fd80399c33e7'
        '744a45124002cc3e820affbc294509525e4fee617bc514d58d066da6daf93d943a4acaecdfdd3640ddda03fee0fe6cf03d5c1edcbc4380171a173ba28646162b'
        '1b22ea47250d0d6961cf5b264a82ade77e4eddd39c9b3cd15c657341df60aed99c6c4cdf5cf0215698bfc3cc89df202da9917cf1102e7535b8a831785741736e'
        '9c9349f515312047f3aa26385d074b0585439a008c19d75fc17a9344e550cb5a07a136bfedcac39b09f048c070f9bec3486468d0766923cf391bb58c9ab20df4'
        '8bfdf114f40a4d4851c511003d0454b450ad1cffc59f360bef53b7cff9272a743e59da42e8ca067e2f48c1abd89dd4e03dcb681f9fb7a3180eff260cfed713ee')

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

prepare() {
  cd $_srcname

  echo "Setting version..."
  scripts/setlocalversion --save-scmversion
  echo "-$pkgrel" > localversion.10-pkgrel
  echo "$_kernelname" > 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
  scripts/config --disable CONFIG_DEBUG_INFO
  scripts/config --disable CONFIG_CGROUP_BPF
  scripts/config --disable CONFIG_BPF_LSM
  scripts/config --disable CONFIG_BPF_PRELOAD
  scripts/config --disable CONFIG_BPF_LIRC_MODE2
  scripts/config --disable CONFIG_BPF_KPROBE_OVERRIDE

  # https://bbs.archlinux.org/viewtopic.php?pid=1824594#p1824594
  scripts/config --enable CONFIG_PSI_DEFAULT_DISABLED

  # https://bbs.archlinux.org/viewtopic.php?pid=1863567#p1863567
  scripts/config --disable CONFIG_LATENCYTOP
  scripts/config --disable CONFIG_SCHED_DEBUG

  # FS#66613
  # https://bugzilla.kernel.org/show_bug.cgi?id=207173#c6
  scripts/config --disable CONFIG_KVM_WERROR

  echo "Applying patch ${_bmq_patch}..."
  patch -Np1 -i "$srcdir/${_bmq_patch}"
  patch -Np1 -i "$srcdir/prjc-fix-compilation-error.patch"

  # non-interactively apply gc 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 "$srcdir/kernel_compiler_patch-$_gcc_more_v/more-uarches-for-kernel-5.8+.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 $_srcname
  make all
}

_package() {
  pkgdesc="The ${pkgbase/linux/Linux} kernel and modules with the Project C scheduler"
  depends=(coreutils kmod initramfs)
  optdepends=('crda: to set the correct wireless channels of your country'
              'linux-firmware: firmware images needed for some devices')

  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
  install -Dm644 "$(make -s image_name)" "$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 the ${pkgbase/linux/Linux} kernel"
  depends=('linux-gc')

  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 "$builddir/arch/x86" -m644 arch/x86/Makefile
  cp -t "$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: