adding mips64el support on linux-libre-rt

4 files changed, 121 insertions, 14 deletions

diff --git a/kernels/linux-libre-rt/Kbuild b/kernels/linux-libre-rt/Kbuild
new file mode 100644
index 000000000..8a9d7dceb
--- /dev/null
+++ b/kernels/linux-libre-rt/Kbuild
@@ -0,0 +1,19 @@
+# Fail on warnings - also for files referenced in subdirs
+# -Werror can be disabled for specific files using:
+# CFLAGS_<file.o> := -Wno-error
+subdir-ccflags-y := -Wno-error
+
+# platform specific definitions
+include arch/mips/Kbuild.platforms
+obj-y := $(platform-y)
+
+# make clean traverses $(obj-) without having included .config, so
+# everything ends up here
+obj- := $(platform-)
+
+# mips object files
+# The object files are linked as core-y files would be linked
+
+obj-y += kernel/
+obj-y += mm/
+obj-y += math-emu/
diff --git a/kernels/linux-libre-rt/Kbuild.platforms b/kernels/linux-libre-rt/Kbuild.platforms
new file mode 100644
index 000000000..90a226888
--- /dev/null
+++ b/kernels/linux-libre-rt/Kbuild.platforms
@@ -0,0 +1,6 @@
+# All platforms listed in alphabetic order
+
+platforms += loongson
+
+# include the platform specific files
+include $(patsubst %, $(srctree)/arch/mips/%/Platform, $(platforms))
diff --git a/kernels/linux-libre-rt/PKGBUILD b/kernels/linux-libre-rt/PKGBUILD
index ebffcd37e..40746f814 100644
--- a/kernels/linux-libre-rt/PKGBUILD
+++ b/kernels/linux-libre-rt/PKGBUILD
@@ -17,8 +17,9 @@ _releasever=4
 _rtpatchver=rt13
 _pkgver=${_basekernel}.${_releasever}
 pkgver=${_basekernel}.${_releasever}_${_rtpatchver}
+_lxopkgver=${_basekernel}.4 # nearly always the same as pkgver
 pkgrel=1.1
-arch=('i686' 'x86_64')
+arch=('i686' 'x86_64' 'mips64el')
 url="http://linux-libre.fsfla.org/"
 license=('GPL2')
 makedepends=('xmlto' 'docbook-xsl')
@@ -30,20 +31,31 @@ source=("http://linux-libre.fsfla.org/pub/linux-libre/releases/${_basekernel}-gn
         'config.i686' 'config.x86_64'
         # standard config files for mkinitcpio ramdisk
         "${pkgname}.preset"
+        'Kbuild'
+        'Kbuild.platforms'
         'boot-logo.patch'
         'change-default-console-loglevel.patch'
         'i915-fix-ghost-tv-output.patch'
-        '3.4.4-fix-backlight-regression.patch')
+        '3.4.4-fix-backlight-regression.patch'
+        "http://www.linux-libre.fsfla.org/pub/linux-libre/lemote/gnewsense/pool/linux-patches-${_lxopkgver}-gnu_0loongsonlibre_mipsel.tar.bz2")
 md5sums=('a5e128ca059cceb8b69148b41ff4ac6f'
          'e9bb311ab329555a61696b1a18df2d34'
          '6d4beaa5ec54f86f91f66c77a5bcc8f4'
          'd176ceb303ecfb2303d9659ea2dd91c7'
          'bcb219ab37ed19912126189cfca30538'
          '82496e68851d1960543a07ba51cdb44a'
+         '2967cecc3af9f954ccc822fd63dca6ff'
+         '8267264d9a8966e57fdacd1fa1fc65c4'
          '04b21c79df0a952c22d681dd4f4562df'
          '9d3c56a4b999c8bfbd4018089a62f662'
          '263725f20c0b9eb9c353040792d644e5'
-         '80a46681386bb87813989faeb92bdd9a')
+         '80a46681386bb87813989faeb92bdd9a'
+         '86910efeadb5d1e5d5416ff1a9dacb33')
+if [ "$CARCH" != "mips64el" ]; then
+    # Don't use the Loongson-specific patches on non-mips64el arches.
+    unset source[${#source[@]}-1]
+    unset md5sums[${#md5sums[@]}-1]
+fi
 
 build() {
   cd "${srcdir}/linux-${_basekernel}"
@@ -76,7 +88,27 @@ build() {
   # (relevant patch sent upstream: https://lkml.org/lkml/2011/7/26/227)
   patch -Np1 -i "${srcdir}/change-default-console-loglevel.patch"
 
-  cat "${srcdir}/config.${CARCH}" > ./.config # simpler
+  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 -Np1 -i ${srcdir}/${_basekernel}*-*-loongson-community.patch
+    patch -Np0 -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_MIPS32_N32=.*|CONFIG_MIPS32_N32=y|g" \
+        -e "s|CONFIG_UEVENT_HELPER_PATH=.*|CONFIG_UEVENT_HELPER_PATH=\"\"|g" \
+        -e "s|CONFIG_LOCALVERSION=.*|CONFIG_LOCALVERSION=\"${_kernelname}\"|g" \
+        -e "s;(CONFIG_USB(_COMMON|_EHCI_HCD|_OHCI_HCD|_STORAGE.*|_UAS)?)=.*;\1=y;g" \
+        ./.config
+  else
+    cat "${srcdir}/config.${CARCH}" > ./.config # simpler
+  fi
 
   if [ "${_kernelname}" != "" ]; then
     sed -i "s|CONFIG_LOCALVERSION=.*|CONFIG_LOCALVERSION=\"${_kernelname}\"|g" ./.config
@@ -109,29 +141,51 @@ build() {
   yes "" | make config
 
   # build!
-  make ${MAKEFLAGS} bzImage modules
+  if [ "$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} vmlinux vmlinuz modules
+  else
+    make ${MAKEFLAGS} bzImage modules
+  fi
 }
 
 package_linux-libre-rt() {
   pkgdesc="The Linux-libre Kernel and modules (with realtime preemption)"
-  depends=('coreutils' 'module-init-tools>=3.16' 'mkinitcpio>=0.7')
+  depends=('coreutils' 'kmod')
   optdepends=('crda: to set the correct wireless channels of your country')
   provides=('kernel26-rt' "linux-rt=$_pkgver")
   conflicts=('kernel26-rt' 'kernel26-libre-rt' 'linux-rt')
   replaces=('kernel26-rt' 'kernel26-libre-rt' 'linux-rt')
   backup=("etc/mkinitcpio.d/${pkgname}.preset")
   install=${pkgname}.install
+  if [ "$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 kernelrelease)"
 
   mkdir -p "${pkgdir}"/{lib/modules,lib/firmware,boot}
   make INSTALL_MOD_PATH="${pkgdir}" modules_install
-  cp arch/$KARCH/boot/bzImage "${pkgdir}/boot/vmlinuz-${pkgname}"
+
+  if [ "$CARCH" == "mips64el" ]; then
+    cp vmlinuz "${pkgdir}/boot/vmlinuz-${pkgname}"
+    cp vmlinux "${pkgdir}/boot/vmlinux-${pkgname}"
+  else
+    cp "arch/${KARCH}/boot/bzImage" "${pkgdir}/boot/vmlinuz-${pkgname}"
+  fi
 
   # add vmlinux
   install -D -m644 vmlinux "${pkgdir}/usr/src/linux-${_kernver}/vmlinux"
@@ -146,6 +200,12 @@ package_linux-libre-rt() {
     -e "s|fallback_image=.*|fallback_image=\"/boot/initramfs-${pkgname}-fallback.img\"|g" \
     -i "${pkgdir}/etc/mkinitcpio.d/${pkgname}.preset"
 
+# mkinitcpio 0.7 relies on bzImage to find the kernel version
+  if [ "$CARCH" == "mips64el" ]; then
+    sed -e "s|ALL_kver=.*|ALL_kver=\"${_kernver}\"|g" \
+        -i "${pkgdir}/etc/mkinitcpio.d/${pkgname}.preset"
+  fi
+
   # remove build and source links
   rm -f "${pkgdir}"/lib/modules/${_kernver}/{source,build}
   # remove the firmware
@@ -153,10 +213,10 @@ package_linux-libre-rt() {
   # 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}${_kernelname:--LIBRE}" "${pkgdir}/lib/modules/${_kernver}/extramodules"
+  ln -s "../extramodules-${_basekernel}${_kernelname:--LIBRE-RT}" "${pkgdir}/lib/modules/${_kernver}/extramodules"
   # add real version for building modules and running depmod from post_install/upgrade
-  mkdir -p "${pkgdir}/lib/modules/extramodules-${_basekernel}${_kernelname:--LIBRE}"
-  echo "${_kernver}" > "${pkgdir}/lib/modules/extramodules-${_basekernel}${_kernelname:--LIBRE}/version"
+  mkdir -p "${pkgdir}/lib/modules/extramodules-${_basekernel}${_kernelname:--LIBRE-RT}"
+  echo "${_kernver}" > "${pkgdir}/lib/modules/extramodules-${_basekernel}${_kernelname:--LIBRE-RT}/version"
 
   # move module tree /lib -> /usr/lib
   mv "$pkgdir/lib" "$pkgdir/usr"
@@ -171,6 +231,15 @@ package_linux-libre-rt-headers() {
   conflicts=('kernel26-rt-headers' 'kernel26-libre-rt-headers' 'linux-rt-headers')
   replaces=('kernel26-rt-headers' 'kernel26-libre-rt-headers' 'linux-rt-headers')
 
+  KARCH=x86
+  [ $CARCH = "mips64el" ] && KARCH=mips
+
+# In case of repackaging this is empty
+  if [ -z "${_kernver}" ]; then
+    cd "${srcdir}/linux-${_basekernel}"
+    _kernver="$(make kernelrelease)"
+  fi
+
   install -dm755 "${pkgdir}/usr/lib/modules/${_kernver}"
 
   cd "${pkgdir}/usr/lib/modules/${_kernver}"
@@ -192,13 +261,19 @@ package_linux-libre-rt-headers() {
   done
 
   # copy arch includes for external modules
-  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/arch/x86"
-  cp -a arch/x86/include "${pkgdir}/usr/src/linux-${_kernver}/arch/x86/"
+  mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/arch/${KARCH}"
+  cp -a "arch/${KARCH}/include" "${pkgdir}/usr/src/linux-${_kernver}/arch/${KARCH}/"
 
   # copy files necessary for later builds
   cp Module.symvers "${pkgdir}/usr/src/linux-${_kernver}"
   cp -a scripts "${pkgdir}/usr/src/linux-${_kernver}"
 
+  if [ "$CARCH" = "mips64el" ]; then
+    cp "arch/${KARCH}/Kbuild" "${pkgdir}/usr/src/linux-${_kernver}/arch/${KARCH}/"
+    cp -a "arch/${KARCH}/loongson" "${pkgdir}/usr/src/linux-${_kernver}/arch/${KARCH}/"
+    cp "${srcdir}/Kbuild.platforms" "${pkgdir}/usr/src/linux-${_kernver}/arch/$KARCH/"
+  fi
+
   # fix permissions on scripts dir
   chmod og-w -R "${pkgdir}/usr/src/linux-${_kernver}/scripts"
   mkdir -p "${pkgdir}/usr/src/linux-${_kernver}/.tmp_versions"
@@ -293,6 +368,10 @@ package_linux-libre-rt-headers() {
   done
 
   # remove unneeded architectures
-  rm -rf "${pkgdir}"/usr/src/linux-${_kernver}/arch/{alpha,arm,arm26,avr32,blackfin,c6x,cris,frv,h8300,hexagon,ia64,m32r,m68k,m68knommu,mips,microblaze,mn10300,openrisc,parisc,powerpc,ppc,s390,score,sh,sh64,sparc,sparc64,tile,unicore32,um,v850,xtensa}
+  rm -rf "${pkgdir}"/usr/src/linux-${_kernver}/arch/{alpha,arm,arm26,avr32,blackfin,c6x,cris,frv,h8300,hexagon,ia64,m32r,m68k,m68knommu,microblaze,mn10300,openrisc,parisc,powerpc,ppc,s390,score,sh,sh64,sparc,sparc64,tile,unicore32,um,v850,xtensa}
+  if [ "$CARCH" = "mips64el" ]; then
+    rm -rf ${pkgdir}/usr/src/linux-${_kernver}/arch/x86
+  else
+    rm -rf ${pkgdir}/usr/src/linux-${_kernver}/arch/mips
+  fi
 }
-
diff --git a/kernels/linux-libre-rt/linux-libre-rt.install b/kernels/linux-libre-rt/linux-libre-rt.install
index e316a354c..7d448d7c6 100644
--- a/kernels/linux-libre-rt/linux-libre-rt.install
+++ b/kernels/linux-libre-rt/linux-libre-rt.install
@@ -4,6 +4,9 @@
 KERNEL_NAME=-rt
 KERNEL_VERSION=3.4.4-1.1-rt13-LIBRE-RT
 
+# set a sane PATH to ensure that critical utils like depmod will be found
+export PATH='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'
+
 post_install () {
   # updating module dependencies
   echo ">>> Updating module dependencies. Please wait ..."