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build-disk-img.sh
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build-disk-img.sh
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# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Small Linux bootloader
INPUT="./bootloader/bootloader.asm"
OUTPUT="disk"
KERN="./vmlinuz"
RD="./initrd"
#size of kern + ramdisk
K_SZ=`stat -c %s $KERN`
R_SZ=`stat -c %s $RD`
#padding to make it up to a sector
K_PAD=$((512 - $K_SZ % 512))
# -D option is used to pass initRdSizeDef to
# bootloader.asm befor compiling
nasm -o $OUTPUT -D initRdSizeDef=$R_SZ $INPUT
cat $KERN >> $OUTPUT
# We fill of zeros until it is up to a sector
if [[ $K_PAD -lt 512 ]]; then
dd if=/dev/zero bs=1 count=$K_PAD >> $OUTPUT
fi
cat $RD >> $OUTPUT