minix/tools/mkboot
Ben Gras daca9de450 Fix to make making a bootable cd possible again.
ow that the image has grown beyond the 1.44M that fits on a floppy.
(previously, the floppy emulation mode was used for cd's.)

the boot cd now uses 'no emulation mode,' where an image is provided on
the cd that is loaded and executed directly. this is the boot monitor.

in order to make this work (the entry point is the same as where the
image is loaded, and the boot monitor needs its a.out header too) and
keep compatability with the same code being used for regular booting, i
prepended 16 bytes that jumps over its header so execution can start
there.

to be able to read the CD (mostly in order to read the boot image),
boot has to use the already present 'extended read' call, but address
the CD using 2k sectors.
2010-01-18 14:10:04 +00:00

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#!/bin/sh
#
# mkboot 2.0 - make boot floppy, make root device bootable, etc.
# Author: Kees J. Bot
trap 'e=$?; rm -f /tmp/mkb.$$; exit $e' 0 2
mdec=/usr/mdec # bootstraps
# Check arguments.
case "$#:$1" in
1:bootable | 1:hdboot | [12]:fdboot )
action=$1 dev=$2 size=$3
;;
*) echo "Usage: $0 [bootable | hdboot | fdboot [device]]" >&2
exit 1
esac
# Get the device table.
. /etc/fstab
# The real root device may be the RAM disk.
realroot=`printroot -r`
# If it's an initial fstab, pretend root is real root
if [ $root = "/dev/ROOT" ]
then root=$realroot
fi
case $action in
bootable | hdboot)
# We need the root device.
if [ $realroot = $root ]
then
rootdir=
else
umount $root 2>/dev/null
mount $root /mnt || exit
rootdir=/mnt
fi
esac
case $action in
bootable)
# Install the boot monitor on the root device and make it bootable.
install -cs -m 644 $mdec/boot $rootdir/boot/boot || exit
sync
installboot -device $root $mdec/bootblock /boot/boot || exit
test $realroot != $root && umount $root
;;
hdboot)
# Install a new image on the root device.
if [ ! -d $rootdir/boot/image ]
then
/boot/image is not yet a directory! Fix it.
su root -c \
"exec mv $rootdir/boot/image /M"
install -d $rootdir/boot/image
su root -c \
"exec mv $rootdir/M $rootdir/boot/image/`uname -r`.`uname -v`"
fi
sh tell_config OS_RELEASE . OS_VERSION >/tmp/mkb.$$
version=`sed 's/[" ]//g;/^$/d' </tmp/mkb.$$`
revision=`cat revision 2>/dev/null`
if [ -z "$revision" ]
then rrevision=""
else rrevision=r$revision
fi
oldrev=$revision
target="${version}r${revision}"
if [ -z "$revision" ]
then
revision=0
rrevision=""
elif [ -f $rootdir/boot/image/$target ]
then
if [ $rootdir/boot/image/$target -newer image ]
then
echo "$root:/boot/image/$target is up to date"
test $realroot != $root && umount $root
exit 0
fi
revision=`expr $revision + 1`
rrevision=r$revision
fi
target="${version}${rrevision}"
set -- `ls -t $rootdir/boot/image`
case $# in
0|1|2|3)
# Not much there, do not remove a thing.
;;
*)
# Remove the third-newest image in /boot/image, but
# only if there's an older one (which is kept).
echo "rm $root:/boot/image/$3"
rm -f "$rootdir/boot/image/$3"
esac
# Install the new image.
echo "install image $root:/boot/image/$target"
install -o root -m 600 image $rootdir/boot/image/$target || exit
# Save the revision number.
test "$revision" != "$oldrev" && echo $revision >revision
test $realroot != $root && umount $root
echo "Done."
;;
fdboot)
# fdboot: Make a boot floppy.
if [ -z "$dev" ]
then
echo -n \
"Finish the name of the floppy device to write (by default 'fd0'): /dev/";
read dev
case "$dev" in
'') dev=/dev/fd0
;;
/dev/*)
;;
*) dev=/dev/$dev
esac
fi
# Make a file system.
umount $dev 2>/dev/null
if mkfs -B 1024 -i 512 $dev
then :
else
echo "mkfs of $dev failed."
exit 1;
fi
# Install /dev, /boot/boot and /boot/image.
mount $dev /mnt || exit
mkdir -p /mnt/boot/image || exit
cpdir /dev /mnt/dev || exit
cp -p $mdec/boot /mnt/boot/boot || exit
cp -p image /mnt/boot/image/ || exit
umount $dev || exit
# Make bootable and copy the boot parameters.
installboot -d $dev $mdec/bootblock /boot/boot || exit
pfile=fdbootparams
if [ -f $pfile ]
then echo "Using floppy boot parameters from file $pfile."
edparams $dev "`cat $pfile`" || exit
else echo "Copying floppy boot parameters from $root."
dd if=$root of=$dev skip=1 seek=1 count=1 conv=silent || exit
fi
edparams $dev 'main(){delay 2000;boot}; save' || exit
echo "Test kernel installed on $dev"
;;
esac
sync
exit 0