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# Maintainer: 苏业钦 <hougelangley1987@gmail.com>

# https://gitlab.manjaro.org/packages/core/linux511
#
# Maintainer: Philip Müller
# Maintainer: Bernhard Landauer
# Maintainer: Helmut Stult

# http://aur.archlinux.org/packages/linux-xanmod
#
# Maintainer: Joan Figueras
# Contributor: Torge Matthies
# Contributor: Jan Alexander Steffens (heftig)
# Contributor: Yoshi2889
# Contributor: Tobias Powalowski
# Contributor: Thomas Baechler
# Contributor: ANDRoid7890 <andrey.android7890@gmail.com>

##
## The following variables can be customized at build time. Use env or export to change at your wish
##
##   Example: env _microarchitecture=25 use_numa=n use_tracers=n use_pds=n makepkg -sc
##
## Look inside 'choose-gcc-optimization.sh' to choose your microarchitecture
## Valid numbers between: 0 to 42
## Default is: 0 => generic
## Good option if your package is for one machine: 42 => native
## 从我个人的使用情况上来看,选择 native 其实比针对性的选择处理器代号带来的性能提升更加明显,在这里而我推荐大家选择42
## 默认我给大家已经选择好了
if [ -z ${_microarchitecture+x} ]; then
  _microarchitecture=99
fi

## Disable NUMA since most users do not have multiple processors. Breaks CUDA/NvEnc.
## Archlinux and Xanmod enable it by default.
## Set variable "use_numa" to: n to disable (possibly increase performance)
##                             y to enable  (stock default)
if [ -z ${use_numa+x} ]; then
  use_numa=y
fi

## For performance you can disable FUNCTION_TRACER/GRAPH_TRACER. Limits debugging and analyzing of the kernel.
## Stock Archlinux and Xanmod have this enabled. 
## Set variable "use_tracers" to: n to disable (possibly increase performance)
##                                y to enable  (stock default)
if [ -z ${use_tracers+x} ]; then
  use_tracers=n
fi

## Enable Cachy CPU scheduler by default https://github.com/xanmod/linux/blob/5.8/Documentation/scheduler/sched-Cachy.rst
## Set variable "use_cachy" to: n to disable (stock Xanmod)
##                              y to enable
## Cachy 已经退出历史舞台,后来作者也将这个算法转移到 CaCule,个人也比较推荐这个,响应速度更快
if [ -z ${use_cachy+x} ]; then
  use_cachy=n
fi

## Enable CONFIG_USER_NS_UNPRIVILEGED flag https://aur.archlinux.org/cgit/aur.git/tree/0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch?h=linux-ck
## Set variable "use_ns" to: n to disable (stock Xanmod)
##                           y to enable (stock Archlinux)
## 这里我不知道为什么作者默认选择 disable,因为这个功能不选择不少私有软件的无法启动的,比方说 Skype 和统信的微信,推荐大家默认启用
#if [ -z ${use_ns+x} ]; then
#  use_ns=y
#fi
## 这个补丁已经没有用了

# 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
if [ -z ${_localmodcfg} ]; then
  _localmodcfg=n
fi

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

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


pkgbase=linux-manjaro-xanmod-uksm
pkgname=("${pkgbase}" "${pkgbase}-headers")
pkgver=5.11.10
_major=5.11
_branch=5.x
xanmod=1
pkgrel=1
pkgdesc='Linux Xanmod'
url="http://www.xanmod.org/"
arch=(x86_64)

__commit="1ef0d1c1ebb0feff97bdfe3cb82b40fa05147a3f" # 5.11.10-1

license=(GPL2)
makedepends=(
  xmlto kmod inetutils bc libelf cpio make patch autoconf automake
  binutils bison fakeroot flex gcc gettext grep groff gzip libtool m4
  pkgconf sed which texinfo
  python-sphinx python-sphinx_rtd_theme graphviz imagemagick git
)
options=('!strip')
_srcname="linux-${pkgver}-xanmod${xanmod}"
source=("https://cdn.kernel.org/pub/linux/kernel/v${_branch}/linux-${_major}.tar."{xz,sign}
        "https://github.com/xanmod/linux/releases/download/${pkgver}-xanmod${xanmod}/patch-${pkgver}-xanmod${xanmod}.xz"
        choose-gcc-optimization.sh
        "https://gitlab.manjaro.org/packages/core/linux511/-/archive/${__commit}/linux511-${__commit}.tar.gz"
        '0002-UKSM.patch')

sha256sums=('04f07b54f0d40adfab02ee6cbd2a942c96728d87c1ef9e120d0cb9ba3fe067b4'
            'b8bc4f6312bdc086c0fecd1cce1ab1ee12b7b4eff63f88239a65461d9ec5e91b'
            'SKIP'
            'e840e41f0f91108f63fd6e085c93b02daa78729268bc31be7be7fb355203e38a'
            'SKIP'
            'f00a84fd382d63cd0d47d6fd8ef6c8608b1c83ff9d6dbdd32cb985898afbbf58') 
validpgpkeys=(
    'ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linux Torvalds
    '647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman
)

# Archlinux patches
_commits=""
for _patch in $_commits; do
    source+=("${_patch}.patch::https://git.archlinux.org/linux.git/patch/?id=${_patch}")
done

# If use_cachy=y then download cachy patch
if [ "$use_cachy" = "y" ]; then
   echo "Cachy branch is not ready yet..." && exit 1
   source+=("https://github.com/xanmod/linux/releases/download/${pkgver}-xanmod${xanmod}-cachy/patch-${pkgver}-xanmod${xanmod}-cachy.xz")
   sha256sums+=('c35685c5d706a683fc0b02cf11fd40db52becae9205bf0d71f6a4a901d836d69')
fi

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

prepare() {
  cd linux-${_major}  
  
  # Apply Xanmod patch
  if [ "$use_cachy" = "y" ]; then
    patch -Np1 -i ../patch-${pkgver}-xanmod${xanmod}-cachy
  else
    patch -Np1 -i ../patch-${pkgver}-xanmod${xanmod}
  fi

  msg2 "Setting version..."
  scripts/setlocalversion --save-scmversion
  #echo "-$pkgrel" > localversion.10-pkgrel
  echo "-MANJARO" > localversion.20-pkgname

  # Archlinux patches
  local src
  for src in "${source[@]}"; do
    src="${src%%::*}"
    src="${src##*/}"
    [[ $src = *.patch ]] || continue
    msg2 "Applying patch $src..."
    patch -Np1 < "../$src"
  done
  
  # Manjaro patches
  rm ../linux511-$__commit/0103-futex.patch  # remove conflicting one 这个补丁已经有了
  rm ../linux511-$__commit/0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-CLONE_NEWUSER.patch  # remove Reversed (or previously applied) patch detected!  Skipping patch. 这个补丁已经没有用了。
  local _patch
  for _patch in ../linux511-$__commit/*; do
      [[ $_patch = *.patch ]] || continue
      msg2 "Applying patch: $_patch..."
      patch -Np1 < "../linux511-$__commit/$_patch"
  done 
  git apply -p1 < "../linux511-$__commit/0513-bootsplash.gitpatch"
  scripts/config --enable CONFIG_BOOTSPLASH
  
  # CONFIG_STACK_VALIDATION gives better stack traces. Also is enabled in all official kernel packages by Archlinux team
  scripts/config --enable CONFIG_STACK_VALIDATION

  # Enable IKCONFIG following Arch's philosophy
  scripts/config --enable CONFIG_IKCONFIG \
                 --enable CONFIG_IKCONFIG_PROC

  # User set. See at the top of this file
  if [ "$use_tracers" = "n" ]; then
    msg2 "Disabling FUNCTION_TRACER/GRAPH_TRACER..."
    scripts/config --disable CONFIG_FUNCTION_TRACER \
                   --disable CONFIG_STACK_TRACER
  fi

  if [ "$use_numa" = "n" ]; then
    msg2 "Disabling NUMA..."
    scripts/config --disable CONFIG_NUMA
  fi

  if [ "$use_cachy" = "y" ]; then
    msg2 "Enabling Cachy CPU scheduler by default..."
    scripts/config --enable CONFIG_CACHY_SCHED
  fi

  #if [ "$use_ns" = "n" ]; then
  #  msg2 "Disabling CONFIG_USER_NS_UNPRIVILEGED"
  #  scripts/config --disable CONFIG_USER_NS_UNPRIVILEGED
  #fi
    
  msg2 "add anbox support"
  scripts/config --enable CONFIG_ASHMEM
  # CONFIG_ION is not set
  scripts/config --enable CONFIG_ANDROID
  scripts/config --enable CONFIG_ANDROID_BINDER_IPC
  scripts/config --enable CONFIG_ANDROID_BINDERFS
  scripts/config --set-str CONFIG_ANDROID_BINDER_DEVICES "binder,hwbinder,vndbinder"
  # CONFIG_ANDROID_BINDER_IPC_SELFTEST is not set
  
  scripts/config --set-str CONFIG_DEFAULT_HOSTNAME "manjaro"

  # Let's user choose microarchitecture optimization in GCC
  sh ${srcdir}/choose-gcc-optimization.sh $_microarchitecture

  # This is intended for the people that want to build this package with their own config
  # Put the file "myconfig" at the package folder to use this feature
  # If it's a full config, will be replaced
  # If not, you should use scripts/config commands, one by line
  if [ -f "${startdir}/myconfig" ]; then
    if ! grep -q 'scripts/config' "${startdir}/myconfig"; then
      # myconfig is a full config file. Replacing default .config
      msg2 "Using user CUSTOM config..."
      cp -f "${startdir}"/myconfig .config
    else
      # myconfig is a partial file. Applying every line
      msg2 "Applying configs..."
      cat "${startdir}"/myconfig | while read -r _linec ; do
        if echo "$_linec" | grep "scripts/config" ; then
          set -- $_linec
          "$@"
        else
          warning "Line format incorrect, ignoring..."
        fi
      done
    fi
    echo
  fi

  make olddefconfig

  ### Optionally load needed modules for the make localmodconfig
  # See https://aur.archlinux.org/packages/modprobed-db
  if [ "$_localmodcfg" = "y" ]; then
    if [ -f $HOME/.config/modprobed.db ]; then
      msg2 "Running Steven Rostedt's make localmodconfig now"
      make LSMOD=$HOME/.config/modprobed.db localmodconfig
    else
      msg2 "No modprobed.db data found"
      exit
    fi
  fi

  make -s kernelrelease > version
  msg2 "Prepared %s version %s" "$pkgbase" "$(<version)"

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

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

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

_package() {
  pkgdesc="The Linux kernel and modules with Xanmod and Manjaro patches (Bootsplash support). Ashmem and binder are enabled"
  depends=('coreutils' 'linux-firmware' 'kmod' 'initramfs' 'mkinitcpio>=27')
  optdepends=('crda: to set the correct wireless channels of your country'
              'linux-firmware: firmware images needed for some devices'
              'bootsplash-systemd: for bootsplash functionality')
  provides=(VIRTUALBOX-GUEST-MODULES WIREGUARD-MODULE)
  replaces=()
  conflicts=()

  cd linux-${_major}
  local kernver="$(<version)"
  local modulesdir="$pkgdir/usr/lib/modules/$kernver"

  msg2 "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 "manjaro-xanmod" | install -Dm644 /dev/stdin "$modulesdir/pkgbase"
  # echo "${_major}-${CARCH}" | install -Dm644 /dev/stdin "$modulesdir/kernelbase"
 
  # add kernel version
  echo "${pkgver}-${pkgrel}-Manjaro-Xanmod x64" | install -Dm644 /dev/stdin "${pkgdir}/boot/${pkgbase}.kver"

  msg2 "Installing modules..."
  make INSTALL_MOD_PATH="$pkgdir/usr" modules_install

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

_package-headers() {
  pkgdesc="Header files and scripts for building modules for linux-manjaro-xanmod kernel"
  provides=()
  replaces=()
  conflicts=()

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

  msg2 "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

  msg2 "Installing KConfig files..."
  find . -name 'Kconfig*' -exec install -Dm644 {} "$builddir/{}" \;

  msg2 "Removing unneeded architectures..."
  local arch
  for arch in "$builddir"/arch/*/; do
    [[ $arch = */x86/ ]] && continue
    echo "Removing $(basename "$arch")"
    rm -r "$arch"
  done

  msg2 "Removing documentation..."
  rm -r "$builddir/Documentation"

  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"
}

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