# Maintainer (Arch):  Joakim Hernberg <jbh@alchemy.lu>
# Contributor (Arch): Ray Rashif <schiv@archlinux.org>
# Contributor (Arch): timbosa <tinny_tim@dodo.com.au>
# Contributor (Arch): Tobias Powalowski <tpowa@archlinux.org>
# Contributor (Arch): Thomas Baechler <thomas@archlinux.org>
# Maintainer: André Silva <emulatorman@parabola.nu>
# Contributor: Nicolás Reynolds <fauno@kiwwwi.com.ar>
# Contributor: Sorin-Mihai Vârgolici <smv@yobicore.org>
# Contributor: Michał Masłowski <mtjm@mtjm.eu>
# Contributor: Márcio Silva <coadde@parabola.nu>
# Contributor: Luke Shumaker <lukeshu@sbcglobal.net>

pkgbase=linux-libre-rt      # Build stock -libre-rt kernel
#pkgbase=linux-libre-custom # Build kernel with a different name
_basekernel=3.14
_releasever=12
_rtpatchver=rt9
_pkgver=${_basekernel}.${_releasever}
pkgver=${_basekernel}.${_releasever}_${_rtpatchver}
pkgrel=1
_lxopkgver=${_basekernel}.10 # nearly always the same as pkgver
arch=('i686' 'x86_64' 'mips64el')
url="https://rt.wiki.kernel.org/"
license=('GPL2')
makedepends=('xmlto' 'docbook-xsl' 'kmod' 'inetutils' 'bc')
options=('!strip')
source=("http://linux-libre.fsfla.org/pub/linux-libre/releases/${_basekernel}-gnu/linux-libre-${_basekernel}-gnu.tar.xz"
        "http://linux-libre.fsfla.org/pub/linux-libre/releases/${_pkgver}-gnu/patch-${_basekernel}-gnu-${_pkgver}-gnu.xz"
        "http://www.kernel.org/pub/linux/kernel/projects/rt/${_basekernel}/patch-${_pkgver}-${_rtpatchver}.patch.xz"
        # the main kernel config files
        'config.i686' 'config.x86_64'
        # standard config files for mkinitcpio ramdisk
        "${pkgbase}.preset"
        'Kbuild'
        'Kbuild.platforms'
        'logo_linux_'{clut224.ppm,vga16.ppm,mono.pbm}
        'change-default-console-loglevel.patch'
        '0001-Bluetooth-allocate-static-minor-for-vhci.patch'
        '0002-module-allow-multiple-calls-to-MODULE_DEVICE_TABLE-p.patch'
        '0003-module-remove-MODULE_GENERIC_TABLE.patch'
        '0006-genksyms-fix-typeof-handling.patch'
        'revert_timers-dont_raise_softirq_unconditionally_and_fixes.patch'
        "http://www.linux-libre.fsfla.org/pub/linux-libre/lemote/gnewsense/pool/debuginfo/linux-patches-${_lxopkgver}-gnu_0loongsonlibre_mipsel.tar.xz")
sha256sums=('477555c709b9407fe37dbd70d3331ff9dde1f9d874aba2741f138d07ae6f281b'
            'bdb59c597c883cc0f78cebccca5652e79b63f30e1d497e0560737ba66a48ae27'
            'aedc16bf897b0a1b0789158afad9ffed92be30eaedf8fe2f27cad659673dc93e'
            '84a7e8d8ffb308f74e3e0bdfec81ac918ae90a6cad579ed5452481b5f5ceb003'
            '23e14dbfc4f4f2991ed532ce07a856fa168ff74404d0c4e7f736147c8ebf41a3'
            'afb12acaae2b2fc03d0d1367066657aacd60eb242162d90eef7b3f5fbe40f554'
            'c5451d5e1eafc4f8d28b1a2958ec3102c124433a414a86450fc32058e004156b'
            '55bf07738a3286168a7929ae16dbca29defd14e77b9d24c487ae4c3d12bb9eb9'
            '074b67818582874146c389c029bc43648d145891a27e47aa2c5c42d3571f0264'
            '2e87a8ec1cc0c91938cac24992d8a3d4362b3e9d939767e4c9d2ec8e6d969d53'
            'f67f60a30bcf2e9a2ba88ad97cace308da7a7f94919bb95c3dc030f5885a8015'
            'faced4eb4c47c4eb1a9ee8a5bf8a7c4b49d6b4d78efbe426e410730e6267d182'
            '6d72e14552df59e6310f16c176806c408355951724cd5b48a47bf01591b8be02'
            '52dec83a8805a8642d74d764494acda863e0aa23e3d249e80d4b457e20a3fd29'
            '65d58f63215ee3c5f9c4fc6bce36fc5311a6c7dbdbe1ad29de40647b47ff9c0d'
            'cf2e7a2d00787f754028e7459688c2755a406e632ce48b60952fa4ff7ed6f4b7'
            'b0107c64c582f7c6fa2e0c7c32a5f944c644f53b5df04667d487731b3c3b4060'
            '727c9328414e0b18478144b700ddb9507269aff1af0130e04f091189efd4ccb8')
if [ "$CARCH" != "mips64el" ]; then
    # don't use the Loongson-specific patches on non-mips64el arches.
    unset source[${#source[@]}-1]
    unset sha256sums[${#sha256sums[@]}-1]
fi

_kernelname=${pkgbase#linux-libre}
_localversionname=-libre-rt

prepare() {
  cd "${srcdir}/linux-${_basekernel}"

  if [ "${_basekernel}" != "${_pkgver}" ]; then
    patch -p1 -i "${srcdir}/patch-${_basekernel}-gnu-${_pkgver}-gnu"
  fi

  # add realtime patch
  patch -p1 -i "${srcdir}/patch-${_pkgver}-${_rtpatchver}.patch"

  # revert a few troublesome patches
  patch -p1 -i "${srcdir}/revert_timers-dont_raise_softirq_unconditionally_and_fixes.patch"

  # add freedo as boot logo
  install -m644 -t drivers/video/logo \
    "${srcdir}/logo_linux_"{clut224.ppm,vga16.ppm,mono.pbm}

  # 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"

  # Fix vhci warning in kmod (to restore every kernel maintainer's sanity)
  patch -p1 -i "${srcdir}/0001-Bluetooth-allocate-static-minor-for-vhci.patch"

  # Fix atkbd aliases
  patch -p1 -i "${srcdir}/0002-module-allow-multiple-calls-to-MODULE_DEVICE_TABLE-p.patch"
  patch -p1 -i "${srcdir}/0003-module-remove-MODULE_GENERIC_TABLE.patch"

  # Fix generation of symbol CRCs
  # http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=dc53324060f324e8af6867f57bf4891c13c6ef18
  patch -p1 -i "${srcdir}/0006-genksyms-fix-typeof-handling.patch"

  if [ "$CARCH" == "mips64el" ]; then
    sed -i "s|^EXTRAVERSION.*|EXTRAVERSION =-libre-rt|" Makefile
    sed -r "s|^( SUBLEVEL = ).*|\1$_sublevel|" \
        < "${srcdir}/lxo-config.patch" > lxo-config.patch
    msg2 "Adding loongson-community patches"
    patch -p1 -i ${srcdir}/${_basekernel}*-*-loongson-community.patch
    patch -p0 -i lxo-config.patch

  # ensure N32, add localversion, remove uevent helper as per
  # https://git.kernel.org/?p=linux/hotplug/udev.git;a=blob_plain;f=README
  # and make USB storage support builtin (e.g. for booting from USB
  # disks without slowly loading an initramfs)
    sed -ri \
        -e "s|CONFIG_MIPS32_N32=.*|CONFIG_MIPS32_N32=y|g" \
        -e "s|CONFIG_UEVENT_HELPER_PATH=.*|CONFIG_UEVENT_HELPER_PATH=\"\"|g" \
        -e "s|CONFIG_LOCALVERSION=.*|CONFIG_LOCALVERSION=\"${_localversionname}\"|g" \
        -e "s;(CONFIG_USB(_COMMON|_EHCI_HCD|_OHCI_HCD|_STORAGE.*|_UAS)?)=.*;\1=y;g" \
        ./.config
  else
    cat "${srcdir}/config.${CARCH}" > ./.config # simpler
  fi

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

  # 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

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

build() {
  cd "${srcdir}/linux-${_basekernel}"

  if [ "$CARCH" == "mips64el" ]; then
    # The build system passes it directly to linker, disable to avoid
    # having unknown -Wl,... options.
    export LDFLAGS=""
    # bzImage is arch-specific and not supported on mips; vmlinux is
    # useful for oprofile.
    make ${MAKEFLAGS} LOCALVERSION= vmlinux vmlinuz modules
  else
    make ${MAKEFLAGS} LOCALVERSION= bzImage modules
  fi
}

_package() {
  pkgdesc="The ${pkgbase^} kernel and modules with realtime preemption"
  [ "${pkgbase}" = "linux-libre" ] && groups=('base')
  depends=('coreutils' 'linux-libre-firmware' 'kmod')
  optdepends=('crda: to set the correct wireless channels of your country')
  provides=("kernel26${_kernelname}=${pkgver}" "linux${_kernelname}=${pkgver}")
  conflicts=("kernel26${_kernelname}" "kernel26-libre${_kernelname}" "linux${_kernelname}")
  replaces=("kernel26${_kernelname}" "kernel26-libre${_kernelname}" "linux${_kernelname}")
  backup=("etc/mkinitcpio.d/${pkgbase}.preset")
  install=${pkgbase}.install
  if [ "$CARCH" = "mips64el" ]; then
      optdepends+=('mkinitcpio: to make the initramfs (needs reinstall of this package)')
      conflicts+=('mkinitcpio<0.7')
  else
      depends+=('mkinitcpio>=0.7')
  fi

  cd "${srcdir}/linux-${_basekernel}"

  KARCH=x86
  [ $CARCH = "mips64el" ] && KARCH=mips

  # 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

  if [ "$CARCH" == "mips64el" ]; then
    cp vmlinuz "${pkgdir}/boot/vmlinuz-${pkgbase}"
    cp vmlinux "${pkgdir}/boot/vmlinux-${pkgbase}"
  else
    cp arch/${KARCH}/boot/bzImage "${pkgdir}/boot/vmlinuz-${pkgbase}"
  fi

  # set correct depmod command for install
  cp -f "${startdir}/${install}" "${startdir}/${install}.pkg"
  true && install=${install}.pkg
  sed \
    -e  "s/KERNEL_NAME=.*/KERNEL_NAME=${_kernelname}/" \
    -e  "s/KERNEL_VERSION=.*/KERNEL_VERSION=${_kernver}/" \
    -i "${startdir}/${install}"

  # install mkinitcpio preset file for kernel
  install -D -m644 "${srcdir}/${pkgbase}.preset" "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"
  sed \
    -e "1s|'linux*.*'|'${pkgbase}'|" \
    -e "s|ALL_kver=.*|ALL_kver=\"/boot/vmlinuz-${pkgbase}\"|" \
    -e "s|default_image=.*|default_image=\"/boot/initramfs-${pkgbase}.img\"|" \
    -e "s|fallback_image=.*|fallback_image=\"/boot/initramfs-${pkgbase}-fallback.img\"|" \
    -i "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"

  # mkinitcpio 0.7 relies on bzImage to find the kernel version
  if [ "$CARCH" == "mips64el" ]; then
    sed -e "s|ALL_kver=.*|ALL_kver=\"${_kernver}\"|" \
        -i "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"
  fi

  # remove build and source links
  rm -f "${pkgdir}"/lib/modules/${_kernver}/{source,build}
  # remove the firmware
  rm -rf "${pkgdir}/lib/firmware"
  # gzip -9 all modules to save 100MB of space
  find "${pkgdir}" -name '*.ko' -exec gzip -9 {} \;
  # make room for external modules
  ln -s "../extramodules-${_basekernel}${_localversionname:--libre-rt}" "${pkgdir}/lib/modules/${_kernver}/extramodules"
  # add real version for building modules and running depmod from post_install/upgrade
  mkdir -p "${pkgdir}/lib/modules/extramodules-${_basekernel}${_localversionname:--libre-rt}"
  echo "${_kernver}" > "${pkgdir}/lib/modules/extramodules-${_basekernel}${_localversionname:--libre-rt}/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-headers() {
  pkgdesc="Header files and scripts for building modules for ${pkgbase^} kernel"
  provides=("kernel26${_kernelname}-headers=${pkgver}" "linux${_kernelname}-headers=${pkgver}")
  conflicts=("kernel26${_kernelname}-headers" "kernel26-libre${_kernelname}-headers" "linux${_kernelname}-headers")
  replaces=("kernel26${_kernelname}-headers" "kernel26-libre${_kernelname}-headers" "linux${_kernelname}-headers")

  KARCH=x86
  [ $CARCH = "mips64el" ] && KARCH=mips

  # in case of repackaging this is empty
  if [ -z "${_kernver}" ]; then
    cd "${srcdir}/linux-${_basekernel}"
    _kernver="$(make LOCALVERSION= kernelrelease)"
  fi

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

  cd "${srcdir}/linux-${_basekernel}"
  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 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/${KARCH}"
  cp -a arch/${KARCH}/include "${pkgdir}/usr/lib/modules/${_kernver}/build/arch/${KARCH}/"

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

  if [ "$CARCH" = "mips64el" ]; then
    cp arch/${KARCH}/Kbuild "${pkgdir}/usr/lib/modules/${_kernver}/build/arch/${KARCH}/"
    cp -a arch/${KARCH}/loongson "${pkgdir}/usr/lib/modules/${_kernver}/build/arch/${KARCH}/"
    cp ${srcdir}/Kbuild.platforms "${pkgdir}/usr/lib/modules/${_kernver}/build/arch/${KARCH}/"
  fi

  # 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"
  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

  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,microblaze,mn10300,openrisc,parisc,powerpc,ppc,s390,score,sh,sh64,sparc,sparc64,tile,unicore32,um,v850,xtensa}
  if [ "$CARCH" = "mips64el" ]; then
    rm -rf ${pkgdir}/usr/lib/modules/${_kernver}/build/arch/x86
  else
    rm -rf ${pkgdir}/usr/lib/modules/${_kernver}/build/arch/mips
  fi
}

_package-docs() {
  pkgdesc="Kernel hackers manual - HTML documentation that comes with the ${pkgbase^} kernel"
  provides=("kernel26${_kernelname}-docs=${pkgver}" "linux${_kernelname}-docs=${pkgver}")
  conflicts=("kernel26${_kernelname}-docs" "kernel26-libre${_kernelname}-docs" "linux${_kernelname}-docs")
  replaces=("kernel26${_kernelname}-docs" "kernel26-libre${_kernelname}-docs" "linux${_kernelname}-docs")

  cd "${srcdir}/linux-${_basekernel}"

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

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