#!/bin/bash -e #--------------------------------------------------------------------- # Filename: build-kernel.sh # Purpose: Builds a Linux kernel # License: BSD-style (for this file only) # Revision: 241221 #--------------------------------------------------------------------- # Warning: This script will delete the directory "/usr/src/linux", if # it exists, and will subsequently put a symlink at that location re- # gardless. #--------------------------------------------------------------------- MODFLAG=no if [ "x$1" == "x--mod" ]; then MODFLAG=yes; fi if [ "x$1" == "x-mod" ]; then MODFLAG=yes; fi if [ "x$1" == "xmod" ]; then MODFLAG=yes; fi RUNFLAG=no if [ "x$1" == "x--run" ]; then RUNFLAG=yes; fi if [ "x$1" == "x-run" ]; then RUNFLAG=yes; fi if [ "x$1" == "xrun" ]; then RUNFLAG=yes; fi if [ "x$MODFLAG" = "xyes" ]; then RUNFLAG=yes fi # CFGLOCAL should end with -32 for 32-bit or -64 for 64-bit. Addition- # ally, CFGLOCAL should match CONFIG_LOCALVERSION in the kernel ".con- # fig" file. CFGLOCAL="-241221-64" KERNFILE=kernel$CFGLOCAL KERNXDIR=/kernelsbuilt/$KERNFILE XWD=`pwd` #--------------------------------------------------------------------- BITS=`echo $CFGLOCAL | sed -e 's/.*-//'` if [ "@$LACSMPJOBS" \!= "@" ]; then cat << END LACSMPJOBS (requested number of parallel build processes) has been set externally to: $LACSMPJOBS END fi MAKECMD="" if [ "@$BITS" == "@32" ]; then NP=`getconf _NPROCESSORS_ONLN` # MAKECMD="make -j$NP ARCH=i386 CFLAGS=-m32" MAKECMD="smpmake -m32" fi if [ "@$BITS" == "@64" ]; then MAKECMD="smpmake" fi if [ "@$MAKECMD" == "@" ]; then cat << END Error: CFGLOCAL should end with -32 for 32-bit or -64 for 64-bit. Additional- ly, CFGLOCAL should match CONFIG_LOCALVERSION in the kernel ".config" file. END exit 1 fi #--------------------------------------------------------------------- if [ "x$RUNFLAG" = "xno" ]; then cat << END 1. This script builds a 4.14.X (or above) to 6.X Intel-based Linux kernel. It can build a 64-bit kernel on a 64-bit box or a 32-bit kernel on a 32-bit or 64-bit box. #--------------------------------------------------------------------- 2 To start, unpack a previously-prepared Laclin kernel source tarball source tarball in some directory. The directory must *not* be located under "/usr". As a related note, if the directory "/usr/src/linux" exists, this script will delete it. The tarball used should be a tarball prepared by "prepare-kernel- sources.sh" as opposed to a standard Linux kernel source tarball. It's recommended that the following additional conditions be met. However, they're optional except for the fact that a lot of free disk is needed in the filesystem used. * The directory used should be named "/ram" * "/ram" should be mounted as tmpfs; i.e., as virtual memory * "/ram" should have at least 4 GB free The "unpack" should create a directory with a name similar to "kernel- 210126-64". #--------------------------------------------------------------------- 3 This script should be executed in the "kernel-..." directory men- tioned previously. The directory in question should contain a kernel source tree, includ- ing, at the top level, the usual "arch" and "block" directories. #--------------------------------------------------------------------- 4. An appropriate kernel ".config" file should be present in the top- level directory. The "prepare-..." script should have placed one there previously. #--------------------------------------------------------------------- 5. In the ".config" file, CONFIG_LOCALVERSION should be set to double- quote, dash, a 6-digit date, dash, 32 or 64 to indicate 32 or 64 bits, double-quote. For example: CONFIG_LOCALVERSION="$CFGLOCAL" CONFIG_LOCALVERSION_AUTO shouldn't be set: # CONFIG_LOCALVERSION_AUTO is not set #--------------------------------------------------------------------- 6. To build a kernel, go to the directory containing ".config", this script, and the kernel's "arch" and "block" directories and execute the following command: bash ./build-kernel.sh --run >& build.log #--------------------------------------------------------------------- 7. If a "build" is successful, the following file should be created: arch/x86/boot/bzImage The path shown here is relative to the directory that contains ".config". #--------------------------------------------------------------------- 8. If a "build" is successful, this script also installs kernel mod- ules in the appropriate "/lib/modules" subdirectory. #--------------------------------------------------------------------- 9. Typical past build times: Dell Inspiron 6400 2.0 GHz Intel Duo 7200 2 GB RAM: 1.0 hours HP EliteBook 8560w (2011) i7 4x2 32 GB RAM: 1.0 hours Same subsequent to cool-down safety measures: 1.75 hours #--------------------------------------------------------------------- Post-build steps are as follows: 10. Select a kernel-file name of the following form: KERNFILE=kernel$CFGLOCAL The part after "kernel" here should be the same as the value of CON- FIG_LOCALVERSION. It should end with "-64" for a 64-bit kernel and "-32" for a 32-bit kernel. #--------------------------------------------------------------------- 11. Copy the following file to the appropriate directory on your GRUB (or other) boot partition: arch/x86/boot/bzImage Give the copy the name selected in the preceding step. If the local distro needs a copy somewhere else (for example, for "re- master" purposes), create that copy as well. For example (destinations will be different on your system): cp arch/x86/boot/bzImage /boot/$KERNFILE cp arch/x86/boot/bzImage /mnt/sda1/boot/$KERNFILE #--------------------------------------------------------------------- 12. Edit your GRUB (or other) boot configuration file(s) to reflect the presence of the file. #--------------------------------------------------------------------- 13. This script tries to do the following for you: 13.1. Build the kernel file and associated modules. Install the mod- ules. 13.2. Move the kernel "build" tree to: /kernelsbuilt/$KERNFILE 13.3. Fix some symlinks: mkdir -p /usr/src rm -fr /usr/src/linux ln -nsf $KERNXDIR /usr/src/linux cd /lib/modules/*$CFGLOCAL/ ln -nsf $KERNXDIR build ln -nsf build source The part after "*" here should be the same as the value of CONFIG_ LOCALVERSION. 13.4. Make a backup copy of the new kernel's "/lib/modules/*$CFGLOCAL" directory. #--------------------------------------------------------------------- 14. Reboot using the new kernel. #--------------------------------------------------------------------- 15. Rebuild the system's "glibc*" package. Generate userland-type kernel header files and move them into place in the current "glibc*" package. The "glibc*" rebuild procedure may take care of the latter step for you. #--------------------------------------------------------------------- 16. Rebuild packages that depend in a strict manner on the kernel. These include, for example: fuse298 fuse300 qemu vboxose5 END exit 1 fi #--------------------------------------------------------------------- # main procedure #--------------------------------------------------------------------- ISUSR=`pwd | grep /usr/ | wc -l` if [ "x$ISUSR" == "x1" ]; then echo Error: Do not run this script anywhere under /usr/ echo See instructions in the script exit 1 fi #--------------------------------------------------------------------- # export LACSLOWDOWN=0.76 export LACSMPTRIES=8 export FORCECFLAGS64=yes gcc --version gcc -dumpmachine #--------------------------------------------------------------------- if [ "x$MODFLAG" = "xno" ]; then echo ============================== `date` initial setup rm -fr arch/*/boot/bzImage echo ============================== `date` $MAKECMD bzImage $MAKECMD bzImage || exit 1 echo ============================== `date` $MAKECMD modules $MAKECMD modules || exit 1 fi echo ============================== `date` $MAKECMD modules_install $MAKECMD modules_install || exit 1 # Note: The "make firmware_install" step is no longer required. #--------------------------------------------------------------------- # move "build" directory out of RAM #--------------------------------------------------------------------- if [ \! -f ./vmlinux ]; then echo Internal error: Something is wrong exit 1 fi XDIR=`pwd` ISRAM=`pwd | grep /ram/ | wc -l` if [ "x$MODFLAG" = "xno" ]; then if [ "x$ISRAM" == "x1" ]; then echo ISRAM yes cd / || exit 1 echo " 001" rm -fr $KERNXDIR || exit 1 echo " 002" mv $XDIR $KERNXDIR || exit 1 echo " 003" cd $KERNXDIR || exit 1 echo Moved build directory to $KERNXDIR else echo ISRAM no XDIR=$XDIR ISRAM=$ISRAM fi fi #--------------------------------------------------------------------- # set up some symlinks #--------------------------------------------------------------------- # If we're cross-building a 32-bit kernel on a 64-bit box, some inte- # gration with the build box is skipped. OKAY=true if [ "x$MODFLAG" = "xno" ]; then if [ "@$BITS" == "@32" ]; then UM=`uname -m` if [ "@$UM" == "@x86_64" ]; then OKAY=false fi fi fi #--------------------------------------------------------------------- if [ "@$OKAY" == "@true" ]; then XDIR=`pwd` mkdir -p /usr/src || exit 1 rm -fr /usr/src/linux || exit 1 ln -nsf $XDIR /usr/src/linux || exit 1 cd /lib/modules/*$CFGLOCAL || exit 1 MDIR=`pwd` ln -nsf $XDIR build || exit 1 ln -nsf build source || exit 1 cd .. rm -fr $MDIR.original || exit 1 cp -a $MDIR $MDIR.original || exit 1 cd $XDIR || exit 1 fi #--------------------------------------------------------------------- if [ "x$MODFLAG" = "xyes" ]; then mkdir -p /boot || exit 1 cp -p arch/x86/boot/bzImage \ /boot/$KERNFILE || exit 1 fi #--------------------------------------------------------------------- # wrap it up #--------------------------------------------------------------------- echo ============================== `date` Results: ls -l arch/x86/boot/bzImage || exit 1 cat << END Done. For post-install steps, see the instructions in the script file usage text section. END exit 0 # "Success" exit