# Maintainer: Figue <ffigue@gmail.com>
# Contributor: graysky <graysky AT archlinux DOT us>
# Contributor: Tobias Powalowski <tpowa@archlinux.org>

pkgbase=linux-bld       # Build kernel with a different name
pkgname=(linux-bld linux-bld-headers)
_kernelname=-bld
pkgver=4.8.15
_srcname=linux-4.8
_pkgver2=${_srcname#*-}.0
pkgrel=1
arch=('i686' 'x86_64')
url="https://github.com/rmullick/linux"
license=('GPL2')
makedepends=('xmlto' 'docbook-xsl' 'kmod' 'inetutils' 'bc' 'libelf')
options=('!strip')
_gcc_patch="enable_additional_cpu_optimizations_for_gcc_v4.9+_kernel_v3.15+.patch"
_bfqversion=v8r4
_bfqversion_old=v7r11
_bfqpath="http://algo.ing.unimo.it/people/paolo/disk_sched/patches/${_pkgver2}-${_bfqversion}"
_BLDpatch="BLD-${_srcname#*-}.patch"
source=("http://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.xz"
	"https://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.sign"
	"http://www.kernel.org/pub/linux/kernel/v4.x/patch-${pkgver}.xz"
	"https://www.kernel.org/pub/linux/kernel/v4.x/patch-${pkgver}.sign"
        "http://repo-ck.com/source/gcc_patch/${_gcc_patch}.gz"
        # the main kernel config files
        'config' 'config.x86_64'
        # pacman hook for initramfs regeneration
        '99-linux.hook'
        # standard config files for mkinitcpio ramdisk
        'linux-bld.preset'
        'change-default-console-loglevel.patch'
        'net_handle_no_dst_on_skb_in_icmp6_send.patch'
        '0001-x86-fpu-Fix-invalid-FPU-ptrace-state-after-execve.patch'
        "${_bfqpath}/0001-block-cgroups-kconfig-build-bits-for-BFQ-${_bfqversion_old}-${_pkgver2}.patch"
        "${_bfqpath}/0002-block-introduce-the-BFQ-${_bfqversion_old}-I-O-sched-to-be-ported.patch"
        "${_bfqpath}/0003-block-bfq-add-Early-Queue-Merge-EQM-to-BFQ-${_bfqversion_old}-to-.patch"
        "${_bfqpath}/0004-Turn-BFQ-${_bfqversion_old}-into-BFQ-${_bfqversion}-for-${_pkgver2}.patch"
        # patches from https://github.com/linusw/linux-bfq/commits/bfq-v8
        '0005-BFQ-Fix.patch'
        '0006-BFQ-Fix.patch'
        "https://raw.githubusercontent.com/rmullick/bld-patches/master/${_BLDpatch}"
        )

sha256sums=('3e9150065f193d3d94bcf46a1fe9f033c7ef7122ab71d75a7fb5a2f0c9a7e11a'
            'SKIP'
            'cdeff3a6e0dc3d6189d1b1d4d6318f0942b9a28409491cf65592879e4c42b1f7'
            'SKIP'
            'e1b8c54c3b81dfd526e24287436b16ec523715e6b3b96156c3e57af035ade127'
            '2ac8818414beb7dbacbd3ad450c516e6ada804827132a7132f63b8189e5f5151'
            '41b9a64542befd2fea170776e8ec22a7d158dd3273633afc9b91662c448cd90a'
            '834bd254b56ab71d73f59b3221f056c72f559553c04718e350ab2a3e2991afe0'
            '5b51a1eacb3e00b304ca54d31f467ec1fb15fdfce93f1c62963d087bf753e812'
            '1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99'
            'b595a1588bafb3d732841cd1b73633970706914f57f2d215c9f1494212d13989'
            '3e955e0f1aae96bb6c1507236adc952640c9bd0a134b9995ab92106a33dc02d9'
            '1dabd969b18b7e09e2ffeffe4c2430dbc26e5df9868563d54ca95f45c690262f'
            'c8d17a7893d5780fd0c90311470160dcc842b81621b30671150e2e3224be86d2'
            'e47ea5b1c2f20cfade4e6a85bff1320dac84ac638e48ef4eec7285fe9e1e1def'
            'c3c96e304aef378f0cc6e1fb18eeabe176e6ba918d13060c105f3d8cabc85f59'
            'bc3177e6026a7363d6190e8b7446005aec38801292602344131ad4e3e67813cb'
            'e2eae358c5417b3ab33abdaf965fb997c615cdbd2cbe7a750526c040374da006'
            '16a5d04bbd76d2dc79473b83af434aa54a72f41f0677823c0381762f75ccb33c')

validpgpkeys=(
              'ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linus Torvalds
	      '647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman
             )

# Running with a 1000 HZ tick rate (vs the ARCH 300) is reported to solve the
# issues with the bfs/linux 3.1x and suspend. For more see:
# http://ck-hack.blogspot.com/2013/09/bfs-0441-311-ck1.html?showComment=1378756529345#c5266548105449573343
_1k_HZ_ticks=y

# Alternative I/O scheduler by Paolo.
# Set this if you want it enabled globally i.e. for all devices in your system
# If you want it enabled on a device-by-device basis, leave this unset and see:
# https://wiki.archlinux.org/index.php/Linux-ck#How_to_Enable_the_BFQ_I.2FO_Scheduler
_BFQ_enable_=y

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

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

  if [ "${_srcname#*-}" != "$pkgver" ]; then
    msg2 "Appliyng upstream patch only if a sub-version is detected"
    patch -p1 -i "${srcdir}/patch-${pkgver}"
  else
    msg2 "Upstream patch not needed"
  fi

  msg2 "BLD patches"
  patch -Np1 -i "${srcdir}/${_BLDpatch}"

  msg2 "Patch source to enable more gcc CPU optimizatons via the make nconfig"
  patch -Np1 -i "${srcdir}/${_gcc_patch}"

  msg "Patching source with BFQ patches"
  for p in $(ls ${srcdir}/000*BFQ*.patch); do
      patch -Np1 -i "$p"
  done

  msg2 "Patches from Archlinux standard package"
  # https://bugzilla.kernel.org/show_bug.cgi?id=189851
  patch -p1 -i "${srcdir}/net_handle_no_dst_on_skb_in_icmp6_send.patch"

  # Revert a commit that causes memory corruption in i686 chroots on our
  # build server ("valgrind bash" immediately crashes)
  # https://bugzilla.kernel.org/show_bug.cgi?id=190061
  patch -Rp1 -i "${srcdir}/0001-x86-fpu-Fix-invalid-FPU-ptrace-state-after-execve.patch"

  # add latest fixes from stable queue, if needed
  # http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git

  # set DEFAULT_CONSOLE_LOGLEVEL to 4 (same value as the 'quiet' kernel param)
  # remove this when a Kconfig knob is made available by upstream
  # (relevant patch sent upstream: https://lkml.org/lkml/2011/7/26/227)
  patch -p1 -i "${srcdir}/change-default-console-loglevel.patch"

  if [ "${CARCH}" = "x86_64" ]; then
    cat "${srcdir}/config.x86_64" > ./.config
  else
    cat "${srcdir}/config" > ./.config
  fi

  if [ "${_kernelname}" != "" ]; then
    sed -i "s|CONFIG_LOCALVERSION=.*|CONFIG_LOCALVERSION=\"${_kernelname}\"|g" ./.config
    sed -i "s|CONFIG_LOCALVERSION_AUTO=.*|CONFIG_LOCALVERSION_AUTO=n|" ./.config
  fi

  msg2 "The Barbershop Load Distribution algorithm is not suitable for NUMA."
  if [ "${CARCH}" = "x86_64" ]; then
    msg "Disabling NUMA from kernel config..."
    sed -i -e 's/CONFIG_NUMA=y/# CONFIG_NUMA is not set/' \
      -i -e '/CONFIG_AMD_NUMA=y/d' \
      -i -e '/CONFIG_X86_64_ACPI_NUMA=y/d' \
      -i -e '/CONFIG_NODES_SPAN_OTHER_NODES=y/d' \
      -i -e '/# CONFIG_NUMA_EMU is not set/d' \
      -i -e '/CONFIG_NODES_SHIFT=6/d' \
      -i -e '/CONFIG_NEED_MULTIPLE_NODES=y/d' \
      -i -e '/# CONFIG_MOVABLE_NODE is not set/d' \
      -i -e '/CONFIG_USE_PERCPU_NUMA_NODE_ID=y/d' \
      -i -e '/CONFIG_ACPI_NUMA=y/d' ./.config
  fi

  ### Optionally enable BFQ as the default I/O scheduler
  if [ -n "$_BFQ_enable_" ]; then
    msg "Setting BFQ as default I/O scheduler..."
    sed -i -e '/CONFIG_DEFAULT_IOSCHED/ s,cfq,bfq,' \
        -i -e s'/CONFIG_DEFAULT_CFQ=y/# CONFIG_DEFAULT_CFQ is not set\nCONFIG_DEFAULT_BFQ=y/' ./.config
  fi

  msg2 "Optionally set tickrate to 1000 to avoid suspend issues"
  # as reported here: http://ck-hack.blogspot.com/2013/09/bfs-0441-311-ck1.html?showComment=1379234249615#c4156123736313039413
  if [ -n "$_1k_HZ_ticks" ]; then
    msg "Setting tick rate to 1k..."
    sed -i -e 's/^CONFIG_HZ_300=y/# CONFIG_HZ_300 is not set/' \
        -i -e 's/^# CONFIG_HZ_1000 is not set/CONFIG_HZ_1000=y/' \
        -i -e 's/^CONFIG_HZ=300/CONFIG_HZ=1000/' .config
  fi

  ### Add CONFIG_BLD=y directly in .config
  echo "CONFIG_BLD=y" >> .config

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

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

  # get kernel version
  make prepare

  # load configuration
  # Configure the kernel. Replace the line below with one of your choice.
  #make menuconfig # CLI menu for configuration
  #make nconfig # new CLI menu for configuration
  #make xconfig # X-based configuration
  #make oldconfig # using old config from previous kernel version
  # ... or manually edit .config
  if [ -n "$_makenconfig" ]; then
    msg "Running make nconfig"
    make nconfig
  fi

  # rewrite configuration
  yes "" | make config >/dev/null
}

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

  make ${MAKEFLAGS} LOCALVERSION= bzImage modules
}

package_linux-bld() {
  pkgdesc="The ${pkgbase/linux/Linux} kernel and modules with BLD patches"
  [ "${pkgbase}" = "linux" ] && groups=('base')
  depends=('coreutils' 'linux-firmware' 'kmod' 'mkinitcpio>=0.7')
  optdepends=('crda: to set the correct wireless channels of your country')
  backup=("etc/mkinitcpio.d/${pkgbase}.preset")
  install=linux-bld.install

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

  KARCH=x86

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

  mkdir -p "${pkgdir}"/{lib/modules,lib/firmware,boot}
  make LOCALVERSION= INSTALL_MOD_PATH="${pkgdir}" modules_install
  cp arch/$KARCH/boot/bzImage "${pkgdir}/boot/vmlinuz-${pkgbase}"

  # set correct depmod command for install
  sed -e "s|%PKGBASE%|${pkgbase}|g;s|%KERNVER%|${_kernver}|g" \
    "${startdir}/${install}" > "${startdir}/${install}.pkg"
  true && install=${install}.pkg

  # install mkinitcpio preset file for kernel
  sed "s|%PKGBASE%|${pkgbase}|g" "${srcdir}/linux-bld.preset" |
    install -D -m644 /dev/stdin "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"

  # install pacman hook for initramfs regeneration
  sed "s|%PKGBASE%|${pkgbase}|g" "${srcdir}/99-linux.hook" |
    install -D -m644 /dev/stdin "${pkgdir}/usr/share/libalpm/hooks/99-${pkgbase}.hook"

  # remove build and source links
  rm -f "${pkgdir}"/lib/modules/${_kernver}/{source,build}
  # remove the firmware
  rm -rf "${pkgdir}/lib/firmware"
  # make room for external modules
  ln -s "../extramodules-${_basekernel}${_kernelname:--ARCH}" "${pkgdir}/lib/modules/${_kernver}/extramodules"
  # add real version for building modules and running depmod from post_install/upgrade
  mkdir -p "${pkgdir}/lib/modules/extramodules-${_basekernel}${_kernelname:--ARCH}"
  echo "${_kernver}" > "${pkgdir}/lib/modules/extramodules-${_basekernel}${_kernelname:--ARCH}/version"

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

  # move module tree /lib -> /usr/lib
  mkdir -p "${pkgdir}/usr"
  mv "${pkgdir}/lib" "${pkgdir}/usr/"

  # add vmlinux
  install -D -m644 vmlinux "${pkgdir}/usr/lib/modules/${_kernver}/build/vmlinux"
}

package_linux-bld-headers() {
  pkgdesc="Header files and scripts for building modules for ${pkgbase/linux/Linux} kernel"

  install -dm755 "${pkgdir}/usr/lib/modules/${_kernver}"

  cd "${srcdir}/${_srcname}"
  install -D -m644 Makefile \
    "${pkgdir}/usr/lib/modules/${_kernver}/build/Makefile"
  install -D -m644 kernel/Makefile \
    "${pkgdir}/usr/lib/modules/${_kernver}/build/kernel/Makefile"
  install -D -m644 .config \
    "${pkgdir}/usr/lib/modules/${_kernver}/build/.config"

  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/include"

  for i in acpi asm-generic config crypto drm generated keys linux math-emu \
    media net pcmcia scsi soc sound trace uapi video xen; do
    cp -a include/${i} "${pkgdir}/usr/lib/modules/${_kernver}/build/include/"
  done

  # copy arch includes for external modules
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/arch/x86"
  cp -a arch/x86/include "${pkgdir}/usr/lib/modules/${_kernver}/build/arch/x86/"

  # copy files necessary for later builds, like nvidia and vmware
  cp Module.symvers "${pkgdir}/usr/lib/modules/${_kernver}/build"
  cp -a scripts "${pkgdir}/usr/lib/modules/${_kernver}/build"

  # fix permissions on scripts dir
  chmod og-w -R "${pkgdir}/usr/lib/modules/${_kernver}/build/scripts"
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/.tmp_versions"

  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/arch/${KARCH}/kernel"

  cp arch/${KARCH}/Makefile "${pkgdir}/usr/lib/modules/${_kernver}/build/arch/${KARCH}/"

  if [ "${CARCH}" = "i686" ]; then
    cp arch/${KARCH}/Makefile_32.cpu "${pkgdir}/usr/lib/modules/${_kernver}/build/arch/${KARCH}/"
  fi

  cp arch/${KARCH}/kernel/asm-offsets.s "${pkgdir}/usr/lib/modules/${_kernver}/build/arch/${KARCH}/kernel/"

  # add docbook makefile
  install -D -m644 Documentation/DocBook/Makefile \
    "${pkgdir}/usr/lib/modules/${_kernver}/build/Documentation/DocBook/Makefile"

  # add dm headers
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/md"
  cp drivers/md/*.h "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/md"

  # add inotify.h
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/include/linux"
  cp include/linux/inotify.h "${pkgdir}/usr/lib/modules/${_kernver}/build/include/linux/"

  # add wireless headers
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/net/mac80211/"
  cp net/mac80211/*.h "${pkgdir}/usr/lib/modules/${_kernver}/build/net/mac80211/"

  # add dvb headers for external modules
  # in reference to:
  # http://bugs.archlinux.org/task/9912
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/media/dvb-core"
  cp drivers/media/dvb-core/*.h "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/media/dvb-core/"
  # and...
  # http://bugs.archlinux.org/task/11194
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/include/config/dvb/"
  cp include/config/dvb/*.h "${pkgdir}/usr/lib/modules/${_kernver}/build/include/config/dvb/"

  # add dvb headers for http://mcentral.de/hg/~mrec/em28xx-new
  # in reference to:
  # http://bugs.archlinux.org/task/13146
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/media/dvb-frontends/"
  cp drivers/media/dvb-frontends/lgdt330x.h "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/media/dvb-frontends/"
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/media/i2c/"
  cp drivers/media/i2c/msp3400-driver.h "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/media/i2c/"

  # add dvb headers
  # in reference to:
  # http://bugs.archlinux.org/task/20402
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/media/usb/dvb-usb"
  cp drivers/media/usb/dvb-usb/*.h "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/media/usb/dvb-usb/"
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/media/dvb-frontends"
  cp drivers/media/dvb-frontends/*.h "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/media/dvb-frontends/"
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/media/tuners"
  cp drivers/media/tuners/*.h "${pkgdir}/usr/lib/modules/${_kernver}/build/drivers/media/tuners/"

  # add xfs and shmem for aufs building
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/fs/xfs"
  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/mm"
  # removed in 3.17 series
  # cp fs/xfs/xfs_sb.h "${pkgdir}/usr/lib/modules/${_kernver}/build/fs/xfs/xfs_sb.h"

  # copy in Kconfig files
  for i in $(find . -name "Kconfig*"); do
    mkdir -p "${pkgdir}"/usr/lib/modules/${_kernver}/build/`echo ${i} | sed 's|/Kconfig.*||'`
    cp ${i} "${pkgdir}/usr/lib/modules/${_kernver}/build/${i}"
  done

  # add objtool for external module building and enabled VALIDATION_STACK option
  if [ -f tools/objtool/objtool ];  then
      mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build/tools/objtool"
      cp -a tools/objtool/objtool ${pkgdir}/usr/lib/modules/${_kernver}/build/tools/objtool/
  fi

  chown -R root.root "${pkgdir}/usr/lib/modules/${_kernver}/build"
  find "${pkgdir}/usr/lib/modules/${_kernver}/build" -type d -exec chmod 755 {} \;

  # strip scripts directory
  find "${pkgdir}/usr/lib/modules/${_kernver}/build/scripts" -type f -perm -u+w 2>/dev/null | while read binary ; do
    case "$(file -bi "${binary}")" in
      *application/x-sharedlib*) # Libraries (.so)
        /usr/bin/strip ${STRIP_SHARED} "${binary}";;
      *application/x-archive*) # Libraries (.a)
        /usr/bin/strip ${STRIP_STATIC} "${binary}";;
      *application/x-executable*) # Binaries
        /usr/bin/strip ${STRIP_BINARIES} "${binary}";;
    esac
  done

  # remove unneeded architectures
  rm -rf "${pkgdir}"/usr/lib/modules/${_kernver}/build/arch/{alpha,arc,arm,arm26,arm64,avr32,blackfin,c6x,cris,frv,h8300,hexagon,ia64,m32r,m68k,m68knommu,metag,mips,microblaze,mn10300,openrisc,parisc,powerpc,ppc,s390,score,sh,sh64,sparc,sparc64,tile,unicore32,um,v850,xtensa}

  # remove a files already in linux-docs package
  rm -f "${pkgdir}/usr/lib/modules/${_kernver}/build/Documentation/kbuild/Kconfig.recursion-issue-01"
  rm -f "${pkgdir}/usr/lib/modules/${_kernver}/build/Documentation/kbuild/Kconfig.recursion-issue-02"
  rm -f "${pkgdir}/usr/lib/modules/${_kernver}/build/Documentation/kbuild/Kconfig.select-break"
}

#_package_linux-bld-docs() {
#  pkgdesc="Kernel hackers manual - HTML documentation that comes with the ${pkgbase/linux/Linux} kernel"
#
#  cd "${srcdir}/${_srcname}"
#
#  mkdir -p "${pkgdir}/usr/lib/modules/${_kernver}/build"
#  cp -al Documentation "${pkgdir}/usr/lib/modules/${_kernver}/build"
#  find "${pkgdir}" -type f -exec chmod 444 {} \;
#  find "${pkgdir}" -type d -exec chmod 755 {} \;
#
#  # remove a file already in linux package
#  rm -f "${pkgdir}/usr/lib/modules/${_kernver}/build/Documentation/DocBook/Makefile"
#}

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

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