PKGBUILD

# forked from https://github.com/archlinuxarm/PKGBUILDs/tree/master/core/linux-armv7

pkgbase=linux-xe303c12
pkgname=$pkgbase
_kernelname=${pkgbase#linux}
_desc="ARMv7 XE303C12-platform"
pkgver=5.15.79
_srcname=linux-${pkgver}
pkgrel=1
rcnver=5.15.0
rcnrel=rc7-armv7-x7
arch=('armv7h')
url="http://www.kernel.org/"
license=('GPL2')
makedepends=('xmlto' 'docbook-xsl' 'kmod' 'inetutils' 'bc' 'git' 'uboot-tools' 'vboot-utils' 'dtc' 'flex' 'make' 'gcc' 'fakeroot' 'bison')
options=('!strip')
MAKEFLAGS="-j$(grep 'model name' /proc/cpuinfo --count)"
source=("http://www.kernel.org/pub/linux/kernel/v5.x/${_srcname}.tar.xz"
#        "http://rcn-ee.com/deb/stretch-armhf/v${rcnver}-${rcnrel}/patch-${rcnver%.0}-${rcnrel}.diff.xz"
        "http://rcn-ee.com/deb/sid-armhf/v${rcnver}-${rcnrel}/patch-${rcnver%.0}-${rcnrel}.diff.gz"
        'https://raw.githubusercontent.com/archlinuxarm/PKGBUILDs/master/core/linux-armv7/0004-fix-mvsdio-eMMC-timing.patch'
        'config'
        'kernel.its'
        'https://github.com/archlinuxarm/PKGBUILDs/raw/master/core/linux-armv7/kernel.keyblock'
        'https://github.com/archlinuxarm/PKGBUILDs/raw/master/core/linux-armv7/kernel_data_key.vbprivk'
)
md5sums=('SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' ) #'SKIP')

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

  # add upstream patch
  #git apply --whitespace=nowarn ../patch-${pkgver}

  # RCN patch
  git apply ../patch-${rcnver%.0}-${rcnrel}.diff

  # ALARM patches
  git apply ../0004-fix-mvsdio-eMMC-timing.patch

  cat "${srcdir}/config" > ./.config

  # add pkgrel to extraversion
  sed -ri "s|^(EXTRAVERSION =)(.*)|\1 \2-${pkgrel}|" Makefile

  # don't run depmod on 'make install'. We'll do this ourselves in packaging
  sed -i '2iexit 0' scripts/depmod.sh
}

build() {

  cd "${srcdir}/${_srcname}"
  make ${MAKEFLAGS} prepare
  make ${MAKEFLAGS} menuconfig

  #ff=" -O2 -pipe -march=armv7-a+mp+neon-vfpv4 --param l1-cache-size=64 --param l2-cache-size=1024 -mfpu=neon-vfpv4 -fno-plt -faggressive-loop-optimizations -fguess-branch-probability -floop-nest-optimize -fomit-frame-pointer -fsel-sched-pipelining -fsel-sched-pipelining-outer-loops -fpredictive-commoning -fprefetch-loop-arrays -ftree-loop-optimize -floop-interchange -floop-unroll-and-jam -fpeel-loops -funswitch-loops -fvect-cost-model=dynamic -fsimd-cost-model=dynamic -fsplit-ivs-in-unroller -ftree-loop-ivcanon -ftree-loop-im "
  ff=" -O2 -pipe -march=armv7-a+mp+neon-vfpv4 --param l1-cache-size=64 --param l2-cache-size=1024 -mfpu=neon-vfpv4 -ftracer -funroll-loops -fprefetch-loop-arrays -fpredictive-commoning -fsel-sched-reschedule-pipelined"

  export CFLAGS+="$ff" 
  export CXXFLAGS+="$ff"
  
  echo force custom gcc flags
  for tmpcycle in $(find -name Makefile); do
    #sed -i "s/armv7-a/armv7-a+mp+neon-vfpv4 --param l1-cache-size=64 --param l2-cache-size=1024 -mfpu=neon-vfpv4 -fno-plt -faggressive-loop-optimizations -fguess-branch-probability -floop-nest-optimize -fomit-frame-pointer -fsel-sched-pipelining -fsel-sched-pipelining-outer-loops -fpredictive-commoning -fprefetch-loop-arrays -ftree-loop-optimize -floop-interchange -floop-unroll-and-jam -fpeel-loops -funswitch-loops -fvect-cost-model=dynamic -fsimd-cost-model=dynamic -fsplit-ivs-in-unroller -ftree-loop-ivcanon -ftree-loop-im /g" $tmpcycle
    sed -i "s/armv7-a/armv7-a+mp+neon-vfpv4  --param l1-cache-size=64 --param l2-cache-size=1024 -O2 -ftracer /g" $tmpcycle
    sed -i "s/vfpv /vfpv4 /g" $tmpcycle
    sed -i "s/vfpv,/vfpv4,/g" $tmpcycle
    sed -i "s/-Os/-O2/g" $tmpcycle
    sed -i "s/-O2/-O2 --param l1-cache-size=64 --param l2-cache-size=1024 -ftracer -funroll-loops -fprefetch-loop-arrays -fpredictive-commoning -fsel-sched-reschedule-pipelined /g" $tmpcycle
    #sed -i "s/-O2/-O2 -march=armv7-a+mp+neon-vfpv4 --param l1-cache-size=64 --param l2-cache-size=1024 -mfpu=neon-vfpv4 -fno-plt -faggressive-loop-optimizations -fguess-branch-probability -floop-nest-optimize -fomit-frame-pointer -fsel-sched-pipelining -fsel-sched-pipelining-outer-loops -fpredictive-commoning -fprefetch-loop-arrays -ftree-loop-optimize -floop-interchange -floop-unroll-and-jam -fpeel-loops -funswitch-loops -fvect-cost-model=dynamic -fsimd-cost-model=dynamic -fsplit-ivs-in-unroller -ftree-loop-ivcanon -ftree-loop-im /g" $tmpcycle

  done
 
  make ${MAKEFLAGS} zImage modules exynos5250-snow.dtb exynos5250-snow-rev5.dtb
}

package() {
  pkgdesc="The Linux Kernel, flash image, modules and headers for samsung/google snow XE303C12 chromebook - ${_desc}"
  depends=('coreutils' 'kmod' 'uboot-tools' 'vboot-utils')
  optdepends=('linux-xe303c12-firmware: contains the necessary firmwares for the xe303c12 chromebook, takes up 5M or something' 
    'linux-firmware: contains all available firmwares, takes up 500M or something'
    'crda: to set the correct wireless channels of your country' 
    'mkinitcpio>=0.7: not needed for this kernel actually')
  backup=("etc/mkinitcpio.d/${pkgbase}.preset")
  provides=("linux=${pkgver}" "WIREGUARD-MODULE" "linux-headers=${pkgver}" )
  conflicts=('linux' 'linux-headers' )
  replaces=('linux-armv7' 'linux-armv7-chromebook' 'linux-armv7-rc-chromebook' 'linux-armv7-rc' 'linux-armv7-rc-chromebook' 'linux-armv7-headers' 'linux-armv7-chromebook-headers' 'linux-armv7-rc-chromebook-headers' 'linux-armv7-rc-headers' 'linux-armv7-rc-chromebook-headers')

  cd "${srcdir}/${_srcname}"

  KARCH=arm

  # get kernel version
  _kernver="$(make kernelrelease)"
  _basekernel=${_kernver%%-*}
  _basekernel=${_basekernel%.*}

  mkdir -p "${pkgdir}"/{boot,usr/lib/modules}
  make ${MAKEFLAGS} INSTALL_MOD_PATH="${pkgdir}/usr" modules_install
  
  # make INSTALL_DTBS_PATH="${pkgdir}/boot/dtbs" dtbs_install
  # custom builded dtb will be installed manually
  install -D arch/$KARCH/boot/dts/exynos5250-snow.dtb -m755 "${pkgdir}/boot/dtbs/exynos5250-snow.dtb"
  install -D arch/$KARCH/boot/dts/exynos5250-snow-rev5.dtb -m755 "${pkgdir}/boot/dtbs/exynos5250-snow-rev5.dtb"
  
  cp arch/$KARCH/boot/zImage "${pkgdir}/boot/zImage"
  
  mkdir -p "${pkgdir}"/boot/reflash
  cp ${srcdir}/kernel.keyblock ${pkgdir}/boot/reflash/kernel.keyblock
  cp ${srcdir}/kernel_data_key.vbprivk ${pkgdir}/boot/reflash/kernel_data_key.vbprivk
  echo '#!/bin/bash
if [ "$(whoami)" == "root" ]; then

# resign kernel

echo "
You may re-sign kernel and customize kernel boot string. 
Regular user do not need it, so it is safe to press n.
Do you want to do this? (y/N)
"
read -r tmpvar1 
if $(echo $tmpvar1 | grep -q [Yy]); then
    bootcmd='"'console=tty0 init=/sbin/init root=PARTUUID=%U/PARTNROFF=1 rootwait rw noinitrd zswap.compressor=zstd zswap.max_pool_percent=40 audit=0'"'
    echo "default bootcmd is

$bootcmd

Be very careful, without init=/sbin/init root=PARTUUID=%U/PARTNROFF=1 
or something like that your could get a bootfail.
Now you may specify a new one or just press Enter
"
    tmpvar2=""
    read -r tmpvar2
    if [ ! -z "$tmpvar2" ]; then
        bootcmd="$tmpvar2"
    else
        echo "  Will be used default boot string
	"
    fi

    # make kernel.its
    echo '"'"'
/dts-v1/;
/ {
    description = "Chrome OS kernel image with one or more FDT blobs";
    #address-cells = <1>;
    images {
        kernel@1 {
            description = "kernel";
            data = /incbin/("/boot/zImage");
            type = "kernel_noload";
            arch = "arm";
            os = "linux";
            compression = "none";
            load = <0>;
            entry = <0>;
        };
        fdt@1 {
            description = "exynos5250-snow.dtb";
            data = /incbin/("/boot/dtbs/exynos5250-snow.dtb");
            type = "flat_dt";
            arch = "arm";
            compression = "none";
            hash@1 {
                algo = "sha1";
            };
        };
        fdt@2 {
            description = "exynos5250-snow-rev5.dtb";
            data = /incbin/("/boot/dtbs/exynos5250-snow-rev5.dtb");
            type = "flat_dt";
            arch = "arm";
            compression = "none";
            hash@1 {
                algo = "sha1";
            };
        };
    };
    configurations {
        default = "conf@1";
        conf@1 {
            kernel = "kernel@1";
            fdt = "fdt@1";
        };
        conf@2 {
            kernel = "kernel@1";
            fdt = "fdt@2";
        };
    };
};
        '"'"'> /tmp/kernel.its
        
        #
        mkimage -D "-I dts -O dtb -p 2048" -f /tmp/kernel.its /tmp/vmlinux.uimg
                
        # make empty bootloader
        dd if=/dev/zero of=/tmp/bootloader.bin bs=512 count=1
        
        echo $bootcmd > /tmp/cmdline
        
        # backup default kernel_image
        mv -f /boot/kernel_image /boot/backup_kernel_image
        
        # final step
        vbutil_kernel \
        --pack /boot/kernel_image \
        --version 1 \
        --vmlinuz /tmp/vmlinux.uimg \
        --arch arm \
        --keyblock /boot/reflash/kernel.keyblock \
        --signprivate /boot/reflash/kernel_data_key.vbprivk \
        --config /tmp/cmdline \
        --bootloader /tmp/bootloader.bin
        
        # clear used files
        rm -f /tmp/vmlinux.uimg /tmp/cmdline /tmp/bootloader.bin
fi

# flash kernel

  krnprts=""
  krnprtc=0
  for i in $(ls /dev | grep -x --regexp="mmcblk[0-9]" --regexp="sd[a-z]" --regexp="vd[a-z]"); do
    if $(cgpt show /dev/$i | grep Label | grep -q [Kk]ernel); then
      if $(echo $i | grep -q mmcblk); then
        krnprts+="$i""p$(cgpt show /dev/$i | grep Label | grep [Kk]ernel -m 1 | sed '"'"'s/  / /g'"'"' | sed '"'"'s/  / /g'"'"' | sed '"'"'s/ La.*//g'"'"' | sed '"'"'s/.* //g'"'"') "
      else
        krnprts+="$i$(cgpt show /dev/$i | grep Label | grep [Kk]ernel -m 1 | sed '"'"'s/  / /g'"'"' | sed '"'"'s/  / /g'"'"' | sed '"'"'s/ La.*//g'"'"' | sed '"'"'s/.* //g'"'"') "
      fi
      krnprtc=$(($krnprtc+1))
    fi
  done
  
  echo ""
  if [ "$krnprtc" -eq 0 ]; then
    echo "Chrome OS kernel partition did not detected." 
    echo "  You may need to flash kernel_image manually."
  elif [ "$krnprtc" -eq 1 ]; then
    if $(echo $krnprts | grep -q mmcblk0); then
	pr_part_type="# usually internal MMC"
    elif $(echo $krnprts | grep -q mmcblk1); then
	pr_part_type="# usually SD-card"
    elif $(echo $krnprts | grep -q sd); then
	pr_part_type="# usually USB-disk"
    else
	pr_part_type="# unknown disk type"
    fi
    echo "Finded ChromeOs kernel partition - $krnprts $pr_part_type"
    echo "  Do you want to flash a new kernel to it? (y/N)"
    read -r shouldwe
    if [[ $shouldwe =~ ^([yY][eE][sS]|[yY])$ ]]; then
      echo make kernel partition backup to /boot/krn_pt_bk.gz
      dd if=/dev/$krnprts | gzip --best > /boot/krn_pt_bk.gz
      echo flash kernel
      dd if=/boot/kernel_image of=/dev/$krnprts
      sync
    else
      echo "You may flash kernel manually like:"
      echo "dd if=/boot/kernel_image of=/dev/$krnprts"
    fi
  else
    echo "Finded more than one Chrome OS kernel partition."
    echo "Current root is /dev/$(mount | grep " / " | sed "s/.*dev\///g" | sed "s/ .*//g")"
    echo "You need to specify next action"
    echo "  0 for do not flash"
    numpart=0
    for i in $krnprts; do
      numpart=$(($numpart+1))
      if $(echo $i | grep -q mmcblk0); then
	pr_part_type="# usually internal MMC"
      elif $(echo $i | grep -q mmcblk1); then
	pr_part_type="# usually SD-card"
      elif $(echo $i | grep -q sd); then
	pr_part_type="# usually USB-disk"
      else
	pr_part_type="# unknown disk type"
      fi
      echo "  $numpart for flash $i partition $pr_part_type"
    done
    #echo ""
    echo "Wrong partition may lead to bootfail. Be aware!
"
    read -r shouldwe
    if [ $shouldwe -gt 0 ]&&[ $shouldwe -le $numpart ]; then
      numpart=0
      for i in $krnprts; do
        numpart=$(($numpart+1))
        if [ $numpart -eq $shouldwe ]; then
          echo make kernel partition backup to /boot/krn_pt_bk.gz
          dd if=/dev/$i | gzip --best > /boot/krn_pt_bk.gz
          echo flash kernel
          dd if=/boot/kernel_image of=/dev/$i
          sync
        fi
      done
    else
      echo "  Ok, you may flash kernel manually"
    fi
  fi
else
  echo superuser rights required
fi' > ${pkgdir}/boot/reflash/kerninst
  chmod +x ${pkgdir}/boot/reflash/kerninst

  # make room for external modules
  local _extramodules="extramodules-${_basekernel}${_kernelname}"
  ln -s "../${_extramodules}" "${pkgdir}/usr/lib/modules/${_kernver}/extramodules"

  # add real version for building modules and running depmod from hook
  echo "${_kernver}" |
    install -Dm644 /dev/stdin "${pkgdir}/usr/lib/modules/${_extramodules}/version"

  # remove build and source links
  rm "${pkgdir}"/usr/lib/modules/${_kernver}/{source,build}

  # now we call depmod...
  depmod -b "${pkgdir}/usr" -F System.map "${_kernver}"

## gen kernel flash script
echo '
post_install () {
  /boot/reflash/kerninst
  echo "
  you may repeat this operations by runing /boot/reflash/kerninst
  "
}
post_upgrade() {
  /boot/reflash/kerninst
  echo "
  you may repeat this operations by runing /boot/reflash/kerninst
  "
}

post_remove() {
  rm -f boot/initramfs-linux.img
  rm -f boot/backup_kernel_image
}
' >../../${pkgbase}.pkg
  
true && install=${pkgbase}.pkg   

## install mkinitcpio preset file...
echo "# mkinitcpio preset file for the '${pkgbase}' package

#ALL_config='/etc/mkinitcpio.conf'
#ALL_kver='${_kernver}'

#PRESETS=('default')

#default_config='/etc/mkinitcpio.conf'
#default_image='/boot/initramfs-linux.img'
#default_options=''
" | install -Dm644 /dev/stdin "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"
    
## install pacman hooks
echo "[Trigger]
Type = File
Operation = Install
Operation = Upgrade
Operation = Remove
Target = usr/lib/modules/${_kernver}/*
Target = usr/lib/modules/${_extramodules}/*

[Action]
Description = Updating ${pkgbase} module dependencies...
When = PostTransaction
Exec = /usr/bin/depmod ${_kernver}
" | install -Dm644 /dev/stdin "${pkgdir}/usr/share/libalpm/hooks/60-${pkgbase}.hook"

## not needed because kernel do not use initrd
# echo "[Trigger]
# Type = File
# Operation = Install
# Operation = Upgrade
# Target = boot/zImage
# Target = usr/lib/initcpio/*
# 
# [Action]
# Description = Updating ${pkgbase} initcpios...
# When = PostTransaction
# Exec = /usr/bin/mkinitcpio -p ${pkgbase}
# " | install -Dm644 /dev/stdin "${pkgdir}/usr/share/libalpm/hooks/90-${pkgbase}.hook"

## include headers

  #for i in $(ls include/); do
  #  cp -a include/${i} "${pkgdir}/usr/lib/modules/${_kernver}/build/include/"
  #done


  cd "${srcdir}/${_srcname}"
  local _builddir="${pkgdir}/usr/lib/modules/${_kernver}/build"

  install -Dt "${_builddir}" -m644 Makefile .config Module.symvers
  install -Dt "${_builddir}/kernel" -m644 kernel/Makefile

  mkdir "${_builddir}/.tmp_versions"

  cp -t "${_builddir}" -a include scripts

  install -Dt "${_builddir}/arch/${KARCH}" -m644 arch/${KARCH}/Makefile
 # install -Dt "${_builddir}/arch/${KARCH}/kernel" -m644 arch/${KARCH}/kernel/asm-offsets.s arch/$KARCH/kernel/module.lds

  cp -t "${_builddir}/arch/${KARCH}" -a arch/${KARCH}/include
  for i in dove exynos omap2; do
    mkdir -p "${_builddir}/arch/${KARCH}/mach-${i}"
    #cp -t "${_builddir}/arch/${KARCH}/mach-${i}" -a arch/$KARCH/mach-${i}/include
  done
  for i in omap orion versatile; do
    mkdir -p "${_builddir}/arch/${KARCH}/plat-${i}"
    cp -t "${_builddir}/arch/${KARCH}/plat-${i}" -a arch/$KARCH/plat-${i}/include
  done

  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

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

  # copy in Kconfig files
  find . -name Kconfig\* -exec install -Dm644 {} "${_builddir}/{}" \;

  # remove unneeded architectures
  local _arch
  for _arch in "${_builddir}"/arch/*/; do
    [[ ${_arch} == */${KARCH}/ ]] && continue
    rm -r "${_arch}"
  done

  # remove files already in linux-docs package
  rm -r "${_builddir}/Documentation"

  # remove now broken symlinks
  find -L "${_builddir}" -type l -printf 'Removing %P\n' -delete

  # Fix permissions
  chmod -R u=rwX,go=rX "${_builddir}"

  # strip scripts directory
  local _binary _strip
  while read -rd '' _binary; do
    case "$(file -bi "${_binary}")" in
      *application/x-sharedlib*)  _strip="${STRIP_SHARED}"   ;; # Libraries (.so)
      *application/x-archive*)    _strip="${STRIP_STATIC}"   ;; # Libraries (.a)
      *application/x-executable*) _strip="${STRIP_BINARIES}" ;; # Binaries
      *) continue ;;
    esac
    /usr/bin/strip ${_strip} "${_binary}"
  done < <(find "${_builddir}/scripts" -type f -perm -u+w -print0 2>/dev/null)

## include kernel flash image
  cd "${srcdir}/${_srcname}"
  cp ../kernel.its .
  mkimage -D "-I dts -O dtb -p 2048" -f kernel.its vmlinux.uimg
  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 zswap.compressor=zstd zswap.max_pool_percent=40 audit=0 quiet loglevel=1 ' > cmdline
  vbutil_kernel \
    --pack kernel_image \
    --version 1 \
    --vmlinuz vmlinux.uimg \
    --arch arm \
    --keyblock ../kernel.keyblock \
    --signprivate ../kernel_data_key.vbprivk \
    --config cmdline \
    --bootloader bootloader.bin
  #mkdir -p "${pkgdir}/boot"
  cp kernel_image "${pkgdir}/boot"       
}