SliTaz Repositories

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/linux-libre/stuff/bootloader.sh	Mon May 16 15:34:53 2011 +0200
     1.3 @@ -0,0 +1,220 @@
     1.4 +#!/bin/sh
     1.5 +#
     1.6 +# This script creates a floppy image set from a linux bzImage and can merge
     1.7 +# a cmdline and/or one or more initramfs.
     1.8 +# The total size can not exceed 15M because INT 15H function 87H limitations.
     1.9 +#
    1.10 +# (C) 2009 Pascal Bellard - GNU General Public License v3.
    1.11 +
    1.12 +usage()
    1.13 +{
    1.14 +cat <<EOT
    1.15 +Usage: $0 bzImage [--prefix image_prefix] [--cmdline 'args']
    1.16 +       [--rdev device] [--video mode] [--flags rootflags] [--tracks cnt]
    1.17 +       [--format 1440|1680|1920|2880 ] [--initrd initrdfile]...
    1.18 +
    1.19 +Default values: --format 1440 --tracks 80 --prefix floppy.
    1.20 +
    1.21 +Example:
    1.22 +$0 /boot/vmlinuz-2.6.30.6 --rdev /dev/ram0 --video -3 --cmdline 'rw lang=fr_FR kmap=fr-latin1 laptop autologin' --initrd /boot/rootfs.gz --initrd ./myconfig.gz
    1.23 +EOT
    1.24 +exit 1
    1.25 +}
    1.26 +
    1.27 +KERNEL=""
    1.28 +INITRD=""
    1.29 +CMDLINE=""
    1.30 +PREFIX="floppy."
    1.31 +FORMAT="1440"
    1.32 +RDEV=""
    1.33 +VIDEO=""
    1.34 +FLAGS=""
    1.35 +TRACKS=""
    1.36 +DEBUG=""
    1.37 +while [ -n "$1" ]; do
    1.38 +	case "$1" in
    1.39 +	--c*|-c*)  CMDLINE="$2"; shift;;
    1.40 +	--i*|-i*)  INITRD="$INITRD $2"; shift;;
    1.41 +	--p*|-p*)  PREFIX="$2"; shift;;
    1.42 +	--fo*|-f*) FORMAT="$2"; shift;;
    1.43 +	--fl*)     FLAGS="$2"; shift;;	# 1 read-only, 0 read-write
    1.44 +	--r*|-r*)  RDEV="$2"; shift;;	# /dev/???
    1.45 +	--v*|-v*)  VIDEO="$2"; shift;;	# -3 .. n
    1.46 +	--t*|-t*)  TRACKS="$2"; shift;; # likely 81 .. 84
    1.47 +	--debug)   DEBUG="1";;
    1.48 +	*) KERNEL="$1";;
    1.49 +	esac
    1.50 +	shift
    1.51 +done
    1.52 +[ -n "$KERNEL" -a -f "$KERNEL" ] || usage
    1.53 +if [ -n "$TRACKS" ]; then
    1.54 +	if [ $(( $FORMAT % $TRACKS )) -ne 0 ]; then
    1.55 +		echo "Invalid track count for format $FORMAT."
    1.56 +		usage
    1.57 +	fi
    1.58 +fi
    1.59 +
    1.60 +# write a 16 bits data
    1.61 +# usage: store16 offset data16 file
    1.62 +store16()
    1.63 +{
    1.64 +	n=$2; i=2; while [ $i -ne 0 ]; do
    1.65 +		printf '\\\\x%02X' $(($n & 255))
    1.66 +		i=$(($i-1)); n=$(($n >> 8))
    1.67 +	done | xargs echo -en | \
    1.68 +		dd bs=2 conv=notrunc of=$3 seek=$(( $1 / 2 )) 2> /dev/null
    1.69 +	[ -n "$DEBUG" ] && printf "store16(%04X) = %04X\n" $1 $2 1>&2
    1.70 +}
    1.71 +
    1.72 +# write a 32 bits data
    1.73 +# usage: storelong offset data32 file
    1.74 +storelong()
    1.75 +{
    1.76 +	n=$2; i=4; while [ $i -ne 0 ]; do
    1.77 +		printf '\\\\x%02X' $(($n & 255))
    1.78 +		i=$(($i-1)); n=$(($n >> 8))
    1.79 +	done | xargs echo -en | \
    1.80 +		dd bs=4 conv=notrunc of=$3 seek=$(( $1 / 4 )) 2> /dev/null
    1.81 +	[ -n "$DEBUG" ] && printf "storelong(%04X) = %08X\n" $1 $2 1>&2
    1.82 +}
    1.83 +
    1.84 +# read a 32 bits data
    1.85 +# usage: getlong offset file
    1.86 +getlong()
    1.87 +{
    1.88 +	dd if=$2 bs=1 skip=$(( $1 )) count=4 2> /dev/null | \
    1.89 +		hexdump -e '"" 1/4 "%d" "\n"'
    1.90 +}
    1.91 +
    1.92 +floppyset()
    1.93 +{
    1.94 +	# bzImage offsets
    1.95 +	CylinderCount=496
    1.96 +	SetupSzOfs=497
    1.97 +	FlagsOfs=498
    1.98 +	SyssizeOfs=500
    1.99 +	VideoModeOfs=506
   1.100 +	RootDevOfs=508
   1.101 +	CodeAdrOfs=0x214
   1.102 +	RamfsAdrOfs=0x218
   1.103 +	RamfsLenOfs=0x21C
   1.104 +	ArgPtrOfs=0x228
   1.105 +
   1.106 +	# boot+setup address
   1.107 +	SetupBase=0x90000
   1.108 +
   1.109 +	stacktop=0x9E00
   1.110 +
   1.111 +	bs=/tmp/bs$$
   1.112 +
   1.113 +	# Get and patch boot sector
   1.114 +	# See  http://hg.slitaz.org/wok/raw-file/711d076b277c/linux/stuff/linux-header-2.6.34.u
   1.115 +	dd if=$KERNEL bs=512 count=1 of=$bs 2> /dev/null
   1.116 +	uudecode <<EOT | dd of=$bs conv=notrunc 2> /dev/null
   1.117 +begin-base64 644 -
   1.118 +/L+6nWgAkAcGF4n8McC5HQDzq1sfD6mg8X1ABlfFd3ixBvOlZWaPR3gGH8ZF
   1.119 ++D/6l1hB6DQBvgACA3QO6HYBWwseKAJ0LFNH6AoBXuhmAbAgzRCwCM0QTuhl
   1.120 +ATwIdAOIBK05NigCdPDoPgE8CnXgiHz+ieb/TBD/TBi/9AGBTRz/gMdFMACc
   1.121 +sBCxBUi0k4lEHLABiUQUmGaY0+BIZgMFZtPoaAAQB7+AACn4nHMCAccx21BW
   1.122 +6J4AXrkAgLSH/kQczRVYnXfcoRoCvxwCsQk4RBxyuJPNE+oAACCQsEYoyL7b
   1.123 +AejSAF3rI4D5E3IEOMF3a4D+AnIEOOZ3bGCB/QAGdCoGUlFTlrQCULEGtQTB
   1.124 +xQSwDyHoBJAnFEAn6IwA/s117LAgzRDitOiWAJjNE2FSUCjIdwKwAZg5+HIC
   1.125 +ifhQtALNE5VeWFpyoJVBjuGAxwJPdFFOdfSM4ZU4wXVFiMj+xrEBOOZ1O4j0
   1.126 +/sW2AID9UHIwOi7wAXIqtQBgvt4B/kQMU+gxAFvoOAB1FlKYzRO4AQLNE1rQ
   1.127 +1Dpk/nXqRgjkdeVh64sWB7AxLAO0DrsHAM0QPA1088OwDejv/6wIwHX4w79s
   1.128 +BLFbZQINuA0BZToNdArNFnT0mM0Wju9Hw1g6AEluc2VydCBkaXNrIDEuBw0A
   1.129 +AA==
   1.130 +====
   1.131 +EOT
   1.132 +
   1.133 +	# Get setup
   1.134 +	setupsz=$(getlong $SetupSzOfs $bs)
   1.135 +	setupszb=$(( $setupsz & 255 ))
   1.136 +	dd if=$KERNEL bs=512 skip=1 count=$setupszb 2> /dev/null >> $bs
   1.137 +
   1.138 +	if [ -n "$TRACKS" ]; then
   1.139 +		[ -n "$DEBUG" ] && echo -n "--tracks " 1>&2
   1.140 +		n=$(getlong $CylinderCount $bs)
   1.141 +		store16 $CylinderCount $(( ($n & -256) + $TRACKS )) $bs
   1.142 +	fi
   1.143 +	if [ -n "$FLAGS" ]; then
   1.144 +		[ -n "$DEBUG" ] && echo -n "--flags " 1>&2
   1.145 +		store16 $FlagsOfs $FLAGS $bs
   1.146 +	fi
   1.147 +	if [ -n "$VIDEO" ]; then
   1.148 +		[ -n "$DEBUG" ] && echo -n "--video " 1>&2
   1.149 +		store16 $VideoModeOfs $VIDEO $bs
   1.150 +	fi
   1.151 +	if [ -n "$RDEV" ]; then
   1.152 +		[ -n "$DEBUG" ] && echo -n "--rdev " 1>&2
   1.153 +		n=$(stat -c '0x%02t%02T' $RDEV 2> /dev/null)
   1.154 +		[ -n "$n" ] || n=$RDEV
   1.155 +		store16 $RootDevOfs $n $bs
   1.156 +	fi
   1.157 +
   1.158 +	# Store cmdline after setup
   1.159 +	if [ -n "$CMDLINE" ]; then
   1.160 +		[ -n "$DEBUG" ] && echo -n "--cmdline '$CMDLINE' " 1>&2
   1.161 +		echo -n "$CMDLINE" | dd bs=512 count=1 conv=sync 2> /dev/null >> $bs
   1.162 +		storelong $ArgPtrOfs $(( $SetupBase + $stacktop )) $bs
   1.163 +	fi
   1.164 +
   1.165 +	# Compute initramfs size
   1.166 +	initrdlen=0
   1.167 +	padding=0
   1.168 +	for i in $( echo $INITRD | sed 's/,/ /' ); do
   1.169 +		[ -s "$i" ] || continue
   1.170 +		[ -n "$DEBUG" ] && echo "--initrd $i " 1>&2
   1.171 +		initrdlen=$(( $initrdlen + $padding ))
   1.172 +		padding=$(stat -c %s $i)
   1.173 +		initrdlen=$(( $initrdlen + $padding ))
   1.174 +		padding=$(( 4096 - ($padding & 4095) ))
   1.175 +		[ $padding -eq 4096 ] && padding=0
   1.176 +	done
   1.177 +	Ksize=$(( $(getlong $SyssizeOfs $bs)*16 ))
   1.178 +	Kpad=$(( (($Ksize+4095)/4096)*4096 - Ksize ))
   1.179 +	if [ $initrdlen -ne 0 ]; then
   1.180 +		[ -n "$DEBUG" ] && echo "initrdlen = $initrdlen " 1>&2
   1.181 +		Kbase=$(getlong $CodeAdrOfs $bs)
   1.182 +		storelong $RamfsAdrOfs \
   1.183 +			$(( (0x1000000 - $initrdlen) & 0xFFFF0000 )) $bs
   1.184 +		storelong $RamfsLenOfs $(( ($initrdlen + 3) & -4 )) $bs
   1.185 +	fi
   1.186 +
   1.187 +	# Output boot sector + setup + cmdline
   1.188 +	dd if=$bs 2> /dev/null
   1.189 +
   1.190 +	# Output kernel code
   1.191 +	dd if=$KERNEL bs=512 skip=$(( $setupszb + 1 )) 2> /dev/null
   1.192 +
   1.193 +	# Pad to next sector
   1.194 +	Kpad=$(( 512 - ($(stat -c %s $KERNEL) & 511) ))
   1.195 +	[ $Kpad -eq 512 ] || dd if=/dev/zero bs=1 count=$Kpad 2> /dev/null
   1.196 +
   1.197 +	# Output initramfs
   1.198 +	padding=0
   1.199 +	for i in $( echo $INITRD | sed 's/,/ /' ); do
   1.200 +		[ -s "$i" ] || continue
   1.201 +		[ $padding -ne 0 ] && dd if=/dev/zero bs=1 count=$padding 2> /dev/null
   1.202 +		dd if=$i 2> /dev/null
   1.203 +		padding=$(( 4 - ($(stat -c %s $i) & 3) ))
   1.204 +		[ $padding -eq 4 ] && padding=0
   1.205 +	done
   1.206 +
   1.207 +	# Cleanup
   1.208 +	rm -f $bs
   1.209 +}
   1.210 +
   1.211 +if [ "$FORMAT" == "0" ]; then # unsplitted
   1.212 +	floppyset > $PREFIX
   1.213 +	exit
   1.214 +fi
   1.215 +floppyset | split -b ${FORMAT}k /dev/stdin floppy$$
   1.216 +i=1
   1.217 +ls floppy$$* | while read file ; do
   1.218 +	output=$PREFIX$(printf "%03d" $i)
   1.219 +	cat $file /dev/zero | dd bs=1k count=$FORMAT conv=sync of=$output 2> /dev/null
   1.220 +	echo $output
   1.221 +	rm -f $file
   1.222 +	i=$(( $i + 1 ))
   1.223 +done