#!/bin/ksh93

#

# build_rovema_kernel.ksh

#

# worse-is-better/simpler rewrite for rovema-149 kernel

#

# Written by Roland Mainz <roland.mainz@nrubsig.org>

#

#

# * install new kernel

#

# $ mount -o remount,rw /

# $ cd /mnt_nfs/work/debian_rt_kernel_src/linux_6_6_32_rt32/dist_files/

# $ dpkg -i *.deb

#

# remove old linux 4.9 kernel:

# $ dpkg -r --force-depends linux-image-4.9.303-rt192

#

#

# * igb_avb.ko installation:

# # igb_avb kernel module must be manually installed on the target system, and the igb.ko kernel module removed

# $ cp dist_files/igb_avb.ko /lib/modules/6.6.32-rt32-rovema149/kernel/drivers/net/ethernet/intel/igb/.

# $ mv /lib/modules/6.6.32-rt32-rovema149/kernel/drivers/net/ethernet/intel/igb/igb.ko /root/igb.ko_disabled

# $ depmod

# $ update-initramfs -k all -u

#

#

#

#

#

# * simatic installation:

# $ cp dist_files/simatic-ipc*.ko /lib/modules/6.6.32-rt32-rovema149/kernel/drivers/mfd/.

# $ depmod

# $ update-initramfs -k all -u

#

# * install closed-source firmware data:

# $ cd /

# $ tar -xf /mnt_nfs/work/debian_rt_kernel_src/linux_6_6_32_rt32/dist_files/linux_firmware_git_lib_firmware_i915_20231211.tar.bz2

# $ update-initramfs -k all -u

#

#

# Installation:

#

#

# Login into target machine:

#

#

# Install updated Debian Jessie packages:

# $ cd /mnt_nfs/work/jessie_target_packages/

# dpkg -i --force-conflicts console-*.deb # conflicts with "plymouth"

# dpkg -i *.deb

#

#

# Update Linux kernel boot args in grub:

# $ vi /etc/default/grub

# GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_idle.max_cstate=0 processor.max_cstate=1 intel_pstate=disable nosoftlockup nmi_watchdog=0 idle=poll nohz=on i915.disable_power_well=0 i915.enable_rc6=0 i915.enable_dc=0 i915.enable_guc=2"

# $ update-grub

#

#

# fix binfmt (Debian 'Jessie' bug):

# $ printf 'ksh\nmagic\n0\n\\x0B\\x13\\x08\n\n/bin/ksh\n\n\n\n\n' >'/var/lib/binfmts/ksh'

#

#

# build Linux kernel v6.6.32-rt32

#

function build_kernel

{

	set -o errexit

	set -o nounset

	# subshell so CWD remains unchanged on return

	(

		mkdir builddir_kernel

		cd builddir_kernel/

		git -c 'checkout.workers=16' clone -b 'v6.6.32-rt32' --single-branch git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git

		cd linux-stable-rt/

		cp '../../myconfig_linux_v6_6_32_rt32.config' '.config'

		#

		# fixme: add patches here

		# - rt RCU patch

		# - default boot args patch

		# - i915 patches

		# - rt udev dir

		#

		time nice -n 19 chrt --idle 0 ksh -c 'CC="gcc -m32" make -j2 bindeb-pkg 2>&1 | tee buildlog.log'

		cd ..

		cp linux-headers-*_i386.deb	"${c.dist_files_dir}/"

		cp linux-image-*_i386.deb	"${c.dist_files_dir}/"

		cp linux-libc-*_i386.deb	"${c.dist_files_dir}/"

	)

	print '# build_kernel OK'

	return 0

}

#

# build custom igb_avb module

#

function build_igbavb

{

	set -o errexit

	set -o nounset

	# subshell so CWD remains unchanged on return

	(

		mkdir builddir_igbavb

		cd builddir_igbavb/

		git clone https://github.com/Avnu/igb_avb.git

		git clone https://github.com/wheybags/glibc_version_header.git

		cd igb_avb/

		# switch to commit 52ad70906fcb50d167475fe606aeb9631ca2b1fb,

		# which is known to work with Linux 6.6.32-rt32

		git checkout '52ad70906fcb50d167475fe606aeb9631ca2b1fb'

		#

		# apply patches

		#

		# fixme:

		# - pciid patch is missing

		# - igb patches may need backport (bfp ?)

		#

		git am <'../../0001-libigb-Use-PTHREAD_PRIO_INHERIT-for-mutex-to-avoid-r.patch'

		git am <'../../0002-Disable-pci_-_pcie_error_reporting-for-Linux-kernels.patch'

		#

		# build kernel module

		#

		cd kmod/

		CC="gcc -m32" make -j2 -C "$PWD/../../../builddir_kernel/linux-stable-rt/" KSRC="$PWD/../../../builddir_kernel/linux-stable-rt/" M=$PWD

		cp igb_avb.ko	"${c.dist_files_dir}/"

		cd ..

		#cp simatic-ipc*.ko /lib/modules/6.6.32-rt32-rovema149/kernel/drivers/mfd/.

		# build libigb.a

		#

		cd lib

		CC="gcc -m32 -pthread -include $PWD/../../glibc_version_header/version_headers/x86/force_link_glibc_2.18.h" make all

		#

		# build shared library vesion of libigb.a

		#

		gcc -m32 -pthread -shared -fPIC -o libigb_avb.so -Wl,--whole-archive libigb.a -Wl,--no-whole-archive -lpthread -lrt

		# make sure we do not pick up libc symbols beyond glibc 2.19

		glibcversymmatch="$(strings 'libigb_avb.so' | grep -E 'GLIBC_2\.[2-9][0-9]')" || true

		if [[ "${glibcversymmatch}" != '' ]] ; then

			print -u2 -f '# build_igbavb: glibc ELF ref for glibc > 2.19 found: %q\n' "$glibcversymmatch"

			return 1

		fi

		cp libigb_avb.so	"${c.dist_files_dir}/."

	)

	print '# build_igbavb OK'

	return 0

}

function build_simatic

{

	set -o errexit

	set -o nounset

	# subshell so CWD remains unchanged on return

	(

		mkdir builddir_simatic

		cd builddir_simatic/

		svn checkout http://svn.rovema.de/repos/bootimage/branches/dev027_kernel5_15/rovema_simatickernelmodules/simatic-ipc-modules-lsp-v1.2.0RC1/

		cd simatic-ipc-modules-lsp-v1.2.0RC1/

		make -C "$PWD/../../builddir_kernel/linux-stable-rt/" KSRC="$PWD/../../builddir_kernel/linux-stable-rt/" M=$PWD

		cp ./simatic-ipc.ko		"${c.dist_files_dir}/"

		cp ./simatic-ipc-leds.ko	"${c.dist_files_dir}/"

		cp ./simatic-ipc-wdt.ko		"${c.dist_files_dir}/"

		cp ./simatic-ipc-batt.ko	"${c.dist_files_dir}/"

		cp ./simatic-ipc-sensors.ko	"${c.dist_files_dir}/"

		cp ./simatic-ipc-ps.ko		"${c.dist_files_dir}/"

		cp ./simatic-ipc-nvram.ko	"${c.dist_files_dir}/"

	)

	print '# build_simatic OK'

	return 0

}

function build_firmware_tarball

{

	set -o errexit

	set -o nounset

	typeset -r linux_firmware_git_tag='20231211'

	typeset -r tarball_filename="linux_firmware_git_lib_firmware_i915_${linux_firmware_git_tag}.tar.bz2"

	# subshell so CWD remains unchanged on return

	(

		mkdir builddir_firmware_tarball

		cd builddir_firmware_tarball/

		git clone -b "${linux_firmware_git_tag}" git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git

		mkdir -p 'lib/firmware/i915'

		ln linux-firmware/i915/* 'lib/firmware/i915/.'

		tar -cvf - 'lib' | pbzip2 >"${tarball_filename}"

		cp "${tarball_filename}" "${c.dist_files_dir}/"

	)

}

#

# main

#

# use ksh93 builtins

export PATH="/opt/ast/bin/:/usr/ast/bin:$PATH"

builtin mkdir

# keep all global script data in a compound variable

# so we can use $ print -u2 -v c # for debugging

compound c

typeset c.dist_files_dir="$PWD/dist_files"

mkdir -p "${c.dist_files_dir}"

#

# build packages

#

build_kernel

build_igbavb

build_simatic

build_firmware_tarball

#

# list resulting packages

#

ls -l "${c.dist_files_dir}"

# EOF.