121 lines
4.1 KiB
Bash
Executable File
121 lines
4.1 KiB
Bash
Executable File
#!/bin/sh
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echo "*** BUILD KERNEL BEGIN ***"
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SRC_DIR=$(pwd)
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# Read the 'JOB_FACTOR' property from '.config'
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JOB_FACTOR="$(grep -i ^JOB_FACTOR .config | cut -f2 -d'=')"
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# Read the 'CFLAGS' property from '.config'
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CFLAGS="$(grep -i ^CFLAGS .config | cut -f2 -d'=')"
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# Find the number of available CPU cores.
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NUM_CORES=$(grep ^processor /proc/cpuinfo | wc -l)
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# Calculate the number of 'make' jobs to be used later.
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NUM_JOBS=$((NUM_CORES * JOB_FACTOR))
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cd work/kernel
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# Prepare the kernel install area.
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rm -rf kernel_installed
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mkdir kernel_installed
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# Change to the kernel source directory which ls finds, e.g. 'linux-4.4.6'.
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cd $(ls -d linux-*)
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# Cleans up the kernel sources, including configuration files.
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echo "Preparing kernel work area..."
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make mrproper -j $NUM_JOBS
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# Read the 'USE_PREDEFINED_KERNEL_CONFIG' property from '.config'
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USE_PREDEFINED_KERNEL_CONFIG="$(grep -i ^USE_PREDEFINED_KERNEL_CONFIG $SRC_DIR/.config | cut -f2 -d'=')"
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if [ "$USE_PREDEFINED_KERNEL_CONFIG" = "true" -a ! -f $SRC_DIR/minimal_config/kernel.config ] ; then
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echo "Config file $SRC_DIR/minimal_config/kernel.config does not exist."
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USE_PREDEFINED_KERNEL_CONFIG="false"
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fi
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if [ "$USE_PREDEFINED_KERNEL_CONFIG" = "true" ] ; then
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# Use predefined configuration file for the kernel.
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echo "Using config file $SRC_DIR/minimal_config/kernel.config"
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cp -f $SRC_DIR/minimal_config/kernel.config .config
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else
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# Create default configuration file for the kernel.
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make defconfig -j $NUM_JOBS
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echo "Generated default kernel configuration."
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# Changes the name of the system to 'minimal'.
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sed -i "s/.*CONFIG_DEFAULT_HOSTNAME.*/CONFIG_DEFAULT_HOSTNAME=\"minimal\"/" .config
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# Enable overlay support, e.g. merge ro and rw directories.
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sed -i "s/.*CONFIG_OVERLAY_FS.*/CONFIG_OVERLAY_FS=y/" .config
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# Enable overlayfs redirection
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echo "CONFIG_OVERLAY_FS_REDIRECT_DIR=y" >> .config
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# Step 1 - disable all active kernel compression options (should be only one).
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sed -i "s/.*\\(CONFIG_KERNEL_.*\\)=y/\\#\\ \\1 is not set/" .config
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# Step 2 - enable the 'xz' compression option.
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sed -i "s/.*CONFIG_KERNEL_XZ.*/CONFIG_KERNEL_XZ=y/" .config
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# Enable the VESA framebuffer for graphics support.
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sed -i "s/.*CONFIG_FB_VESA.*/CONFIG_FB_VESA=y/" .config
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# Read the 'USE_BOOT_LOGO' property from '.config'
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USE_BOOT_LOGO="$(grep -i ^USE_BOOT_LOGO $SRC_DIR/.config | cut -f2 -d'=')"
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if [ "$USE_BOOT_LOGO" = "true" ] ; then
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sed -i "s/.*CONFIG_LOGO_LINUX_CLUT224.*/CONFIG_LOGO_LINUX_CLUT224=y/" .config
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echo "Boot logo is enabled."
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else
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sed -i "s/.*CONFIG_LOGO_LINUX_CLUT224.*/\\# CONFIG_LOGO_LINUX_CLUT224 is not set/" .config
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echo "Boot logo is disabled."
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fi
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# Disable debug symbols in kernel => smaller kernel binary.
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sed -i "s/^CONFIG_DEBUG_KERNEL.*/\\# CONFIG_DEBUG_KERNEL is not set/" .config
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# Enable the EFI stub
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sed -i "s/.*CONFIG_EFI_STUB.*/CONFIG_EFI_STUB=y/" .config
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# Disable Apple Properties (Useful for Macs but useless in general)
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echo "CONFIG_APPLE_PROPERTIES=n" >> .config
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# Check if we are building 32-bit kernel. The exit code is '1' when we are
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# building 64-bit kernel, otherwise the exit code is '0'.
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grep -q "CONFIG_X86_32=y" .config
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# The '$?' variable holds the exit code of the last issued command.
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if [ $? = 1 ] ; then
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# Enable the mixed EFI mode when building 64-bit kernel.
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echo "CONFIG_EFI_MIXED=y" >> .config
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fi
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fi
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# Compile the kernel with optimization for 'parallel jobs' = 'number of processors'.
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# Good explanation of the different kernels:
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# http://unix.stackexchange.com/questions/5518/what-is-the-difference-between-the-following-kernel-makefile-terms-vmlinux-vmlinux
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echo "Building kernel..."
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make \
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CFLAGS="$CFLAGS" \
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bzImage -j $NUM_JOBS
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# Install the kernel file.
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cp arch/x86/boot/bzImage \
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$SRC_DIR/work/kernel/kernel_installed/kernel
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# Install kernel headers which are used later when we build and configure the
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# GNU C library (glibc).
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echo "Generating kernel headers..."
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make \
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INSTALL_HDR_PATH=$SRC_DIR/work/kernel/kernel_installed \
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headers_install -j $NUM_JOBS
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cd $SRC_DIR
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echo "*** BUILD KERNEL END ***"
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