wok-current view linux/stuff/bootloader.sh @ rev 13410
Add: check+
| author | Eric Joseph-Alexandre <erjo@slitaz.org> |
|---|---|
| date | Mon Oct 01 01:39:13 2012 +0200 (2012-10-01) |
| parents | 3ebbba73bb3f |
| children | 2188bfc43e67 |
line source
1 #!/bin/sh
2 #
3 # This script creates a floppy image set from a linux bzImage and can merge
4 # a cmdline and/or one or more initramfs.
5 # The total size can not exceed 15M because INT 15H function 87H limitations.
6 #
7 # (C) 2009 Pascal Bellard - GNU General Public License v3.
9 usage()
10 {
11 cat <<EOT
12 Usage: $0 bzImage [--prefix image_prefix] [--info file ]
13 [--format 1200|1440|1680|1920|2880|... ] [--mem mb]
14 [--rdev device] [--video mode] [--flags rootflags] [--tracks cnt]
15 [--cmdline 'args'] [--dont-edit-cmdline] [--no-syssize-fix]
16 [--address-initrd address] [--initrd initrdfile]...
18 Default values: --format 1440 --tracks 80 --rdev /dev/fd0 --prefix floppy. --mem 16
20 Example:
21 $0 /boot/bzImage --rdev /dev/ram0 --video -3 --cmdline 'rw lang=fr_FR kmap=fr-latin1 laptop autologin' --initrd /boot/rootfs.gz --initrd ./myconfig.gz
22 EOT
23 exit 1
24 }
26 KERNEL=""
27 INITRD=""
28 ADRSRD=""
29 CMDLINE=""
30 PREFIX="floppy."
31 FORMAT="1440"
32 RDEV=""
33 VIDEO=""
34 FLAGS=""
35 TRACKS="80"
36 MEM="16"
37 NOEDIT=""
38 NOSYSSIZEFIX=""
39 INFOFILE=""
40 DEBUG=""
41 while [ -n "$1" ]; do
42 case "${1/--/-}" in
43 -c*) CMDLINE="$2"; shift;;
44 -inf*) INFOFILE="$2"; shift;;
45 -i*) INITRD="$INITRD $2"; shift;;
46 -a*) ADRSRD="$2"; shift;;
47 -h*) HEAP="$2"; shift;;
48 -l*) LOADERTYPE="$2"; shift;;
49 -p*) PREFIX="$2"; shift;;
50 -fl*)FLAGS="$2"; shift;; # 1 read-only, 0 read-write
51 -f*) FORMAT="$2"; shift;;
52 -m*) MEM="$(echo $2 | sed 's/[^0-9]//g')"; shift;;
53 -r*) RDEV="$2"; shift;;
54 -v*) VIDEO="$2"; shift;; # -3 .. n
55 -t*) TRACKS="$2"; shift;; # likely 81 .. 84
56 -n*) NOSYSSIZEFIX="1";;
57 -debug) DEBUG="1";;
58 -d*) NOEDIT="1";;
59 *) KERNEL="$1";;
60 esac
61 shift
62 done
63 [ -n "$KERNEL" -a -f "$KERNEL" ] || usage
64 while [ -L "$KERNEL" ]; do KERNEL="$(readlink "$KERNEL")"; done
65 if [ $(( $FORMAT % $TRACKS )) -ne 0 ]; then
66 echo "Invalid track count for format $FORMAT."
67 usage
68 fi
69 [ 0$MEM -lt 4 ] && MEM=4
70 [ $MEM -gt 16 ] && MEM=16
72 ddq() { dd $@ 2> /dev/null; }
74 patch()
75 {
76 echo -en $(echo ":$2" | sed 's/:/\\x/g') | \
77 ddq bs=1 conv=notrunc of=$3 seek=$((0x$1))
78 [ -n "$DEBUG" ] && echo "patch $1 $2 $4" 1>&2
79 }
81 # usage: store bits offset data file
82 store()
83 {
84 n=$3; for i in $(seq 8 8 $1); do
85 printf '\\\\x%02X' $(($n & 255))
86 n=$(($n >> 8))
87 done | xargs echo -en | ddq bs=1 conv=notrunc of=$4 seek=$(($2))
88 [ -n "$DEBUG" ] && printf "store%d(%03X) = %0$(($1/4))X %s\n" $1 $2 $3 "$5" 1>&2
89 }
91 # usage: getlong offset file
92 getlong()
93 {
94 ddq if=$2 bs=1 skip=$(($1)) count=4 | hexdump -e '"" 1/4 "%d" "\n"'
95 }
97 error()
98 {
99 echo $@ 1>&2
100 rm -f $bs
101 exit 1
102 }
104 floppyset()
105 {
106 # bzImage offsets
107 SetupSzOfs=497
108 FlagsOfs=498
109 VideoModeOfs=506
110 RootDevOfs=508
111 Magic=0x202
112 RamfsAdrOfs=0x218
113 RamfsLenOfs=0x21C
115 # boot+setup address
116 SetupBase=0x90000
118 bs=/tmp/bs$$
120 # Get and patch boot sector
121 # See http://hg.slitaz.org/wok/raw-file/66e38bd6a132/linux/stuff/linux-header.u
122 [ -n "$DEBUG" ] && echo "Read bootsector..." 1>&2
123 ddq if=$KERNEL bs=512 count=1 of=$bs
125 [ $(( $(getlong 0x1FE $bs) & 0xFFFF )) -eq 43605 ] ||
126 error "Not bootable"
128 uudecode <<EOT | ddq of=$bs conv=notrunc
129 begin-base64 644 -
130 /L+4nWgAkBeJ/BYHMcC5HgDzq1sfD6Gg8X1AxXd4BlexBvOlFh9kZo9HeMZF
131 +D/6l1hB6DwBvgACgUwQIIDGRCWbA3QO6GoBWwseKAJ0LFNH6AYBXuhaAbAg
132 zRCwCM0QTuhZATwIdAOIBK05NigCdPDoMgE8CnXgiHz+W4nm/0gQxkAVk4Dz
133 CHX0u/QBoRUCsQVmix9mS2bT60NoAAgHv4AAiXwTiUQbAfjR7yn7nHMCAd9Q
134 V1ZTMdvongBbXlmGzbSHFgfNFVidd9ChGQK7HAKxCTlEG3K6l80T6gAAIJCw
135 RijIvtgB6MoAXesjgPkTcgQ4wXdrgP4CcgQ45ndsYIH9AAZ0KgZSUVOWtAJQ
136 sQa1BMHFBLAPIegEkCcUQCfohAD+zXXssCDNEOK06I4AmM0TYVJQKMh3ArAB
137 mDn4cgKJ+FC0As0TlV5YWnKglUGO6YDHAk90S0519IzplTjBdT+IyP7GsQE4
138 5nU1iPT+xYD9ULYAdSq1AGC+2wH+RAxT6C8AW+g2AHUWUpjNE7gBAs0TWtDU
139 OmT+depGCOR15WHrkbAxLAO0DrsHAM0QPA1088OwDejv/6wIwHX4w79sBLFb
140 ZAINuA0BZDoNdArNFnT0mM0WjudHw1g6AEluc2VydCBkaXNrIDEHDQA=
141 ====
142 EOT
143 # Get setup
144 setupsz=$(( $(getlong $SetupSzOfs $bs) & 0xFF ))
145 if [ $setupsz -eq 0 ]; then
146 setupsz=4
147 store 8 $SetupSzOfs $setupsz $bs "setup size $setupsz"
148 fi
149 [ -n "$DEBUG" ] && echo "Read setup ($setupsz sectors) ..." 1>&2
150 ddq if=$KERNEL bs=512 skip=1 count=$setupsz >> $bs
152 Version=$(( $(getlong 0x206 $bs) & 0xFFFF ))
153 [ $(getlong $Magic $bs) -ne 1400005704 ] && Version=0
154 feature=""
155 while read prot kern info ; do
156 [ $Version -lt $((0x$prot)) ] && continue
157 feature="features $prot starting from kernel $kern "
158 done <<EOT
159 200 1.3.73 kernel_version, bzImage, initrd, loadflags/type_of_loader
160 201 1.3.76 heap_end_ptr
161 202 2.4.0 new cmdline
162 204 2.6.14 long syssize
163 EOT
164 [ -n "$DEBUG" ] && printf "Protocol %X $feature\n" $Version 1>&2
166 # Old kernels need bootsector patches to disable rescent features
167 while read minversion maxversion offset bytes rem; do
168 [ $Version -gt $(( 0x$maxversion )) ] && continue
169 [ $Version -lt $(( 0x$minversion )) ] && continue
170 patch $offset $bytes $bs "$rem"
171 done <<EOT
172 000 1FF 08D B8:00:01 force zImage (movw \$0x100, %ax)
173 000 1FF 0CB EB:0B skip initrd code
174 000 201 01E EB:1E:00:00:00:00 room for the cmdline magic
175 000 201 036 BE:00:00:E8:76:01:EB:0A:06:57:B1:06:F3:A5:EB:DE code in cmdline magic moved
176 000 1FF 039 90:90:90 no kernel version
177 000 201 04B 22:00 old cmdline ptr 1
178 000 201 06D 22:00 old cmdline ptr 2
179 000 203 1F6 00:00 syssize32
180 200 FFF 210 FF type_of_loader=FF
181 201 FFF 224 00:9B heap_end_ptr
182 EOT
183 if [ $Version -lt 514 ]; then
184 version_string=$((0x200 + ($(getlong 0x20E $bs) & 65535) ))
185 store 16 0x0037 $version_string $bs version_string
186 fi
187 if [ $Version -ge 512 -a $(getlong 0x214 $bs) -ge $((0x100000)) ]; then
188 patch 211 81 $bs loadflags=can_use_heap+loadhigh
189 patch 09D 10 $bs LOADSEG=0x1000
190 patch 0A0 00:01 $bs LOADSZ=0x10000
191 fi
192 [ -n "$CMDLINE" ] || patch 04D EB $bs "No cmdline"
193 [ -n "$NOEDIT" ] && patch 059 0D:46:EB:14 $bs 'mov CR,%al ; inc %si; jmp putal'
194 [ 1$TRACKS -ne 180 ] && store 8 0x171 $TRACKS $bs TRACKS
196 [ -n "$FLAGS" ] && store 16 $FlagsOfs $FLAGS $bs FLAGS
197 [ -n "$VIDEO" ] && store 16 $VideoModeOfs $VIDEO $bs VIDEO
198 [ -n "$RDEV" ] || case "$FORMAT" in
199 1200) RDEV=0x0208 ;;
200 1440) RDEV=0x021C ;;
201 2880) RDEV=0x0220 ;;
202 *) RDEV=0x0200 ;;
203 esac
204 while [ -L "$RDEV" ]; do RDEV="$(readlink "$RDEV")"; done
205 [ -b "$RDEV" ] && RDEV=$(stat -c '0x%02t%02T' $RDEV 2> /dev/null)
206 store 16 $RootDevOfs $RDEV $bs RDEV
208 [ $FORMAT -lt 1440 ] && store 8 0xEF 16 $bs 1.2M
209 [ $FORMAT -lt 1200 ] && store 8 0xEF 10 $bs 720K
210 [ $FORMAT -lt 720 ] && store 8 0x171 40 $bs 360K
211 [ $FORMAT -lt 360 ] && store 8 0xEF 9 $bs 320K
212 [ $FORMAT -lt 320 ] && store 8 0xF8 2 $bs 160K
214 # Info text after setup
215 if [ -s "$INFOFILE" ]; then
216 patch 048 9a:00:00:00:90 $bs lcall displayinfo
217 uudecode >$bs.infotext <<EOT
218 begin-base64 644 -
219 MdsGYI7D6AAAXoHGSgCJ8MHoCUii8QGwDbQOuwcAzRCsPAx1I79sBLFbJgIN
220 uBsBJjoNdAnNFnT0mM0Wjsc8IHPjPBt0BuvPCMB1zWEHCx4oAss=
221 ====
222 EOT
223 cat "$INFOFILE" >>$bs.infotext
224 if [ $Version -lt 514 ]; then
225 store 16 0x050 0x0022 $bs.infotext
226 fi
227 ddq if=/dev/zero bs=512 count=1 >>$bs.infotext
228 n=$(($(stat -c %s $bs.infotext)/512))
229 ddq if=$bs.infotext count=$n bs=512 >> $bs
230 rm -f $bs.infotext
231 store 8 0x1F1 $(($setupsz+$n)) $bs update setup size
232 store 8 0x04A $((2+2*$setupsz)) $bs update displayinfo call
233 fi
235 # Store cmdline after setup for kernels >= 0.99
236 if [ -n "$CMDLINE" ]; then
237 echo -n "$CMDLINE" | ddq bs=512 count=1 conv=sync >> $bs
238 CmdlineOfs=0x9E00 # Should be in 0x8000 .. 0xA000
239 ArgPtrOfs=0x228
240 ArgPtrVal=$(( $SetupBase + $CmdlineOfs ))
241 if [ $Version -lt 514 ]; then
242 ArgPtrOfs=0x0020
243 ArgPtrVal=$(( 0xA33F + ($CmdlineOfs << 16) ))
244 fi
245 store 32 $ArgPtrOfs $ArgPtrVal $bs "Cmdline '$CMDLINE'"
246 fi
248 # Compute initramfs size (protocol >= 2.00)
249 [ $Version -lt 512 ] && INITRD=""
250 initrdlen=0
251 INITRDPAD=4
252 INITRDALIGN=0x1000
253 for i in $( echo $INITRD | sed 's/,/ /' ); do
254 [ -s "$i" ] || continue
255 while [ -L "$i" ]; do i="$(readlink $i)"; done
256 size=$(( ($(stat -c %s "$i") + $INITRDPAD - 1) & -$INITRDPAD ))
257 [ -n "$DEBUG" ] && echo "initrd $i $size " 1>&2
258 initrdlen=$(( $initrdlen + $size ))
259 [ -n "$ADRSRD" ] || ADRSRD=$(( (($MEM * 0x100000) - $initrdlen) & -$INITRDALIGN ))
260 store 32 $RamfsAdrOfs $(( $ADRSRD )) $bs initrd adrs
261 store 32 $RamfsLenOfs $initrdlen $bs initrdlen
262 done
264 [ -n "$NOSYSSIZEFIX" ] || store 32 0x1F4 \
265 $(( ($(stat -c %s $KERNEL)+15)/16 - ($setupsz+1)*32)) $bs fix system size
267 # Output boot sector + setup + cmdline
268 ddq if=$bs
270 # Output kernel code
271 syssz=$(( ($(getlong 0x1F4 $bs)+31)/32 ))
272 cat $KERNEL /dev/zero | ddq bs=512 skip=$(( $setupsz+1 )) count=$syssz conv=sync
274 # Output initramfs
275 for i in $( echo $INITRD | sed 's/,/ /' ); do
276 [ -s "$i" ] || continue
277 ddq if=$i
278 padding=$(( $INITRDPAD - ($(stat -c %s $i) % $INITRDPAD) ))
279 [ $padding -eq $INITRDPAD ] || ddq if=/dev/zero bs=1 count=$padding
280 done
282 # Cleanup
283 rm -f $bs
284 }
286 if [ "$FORMAT" == "0" ]; then # unsplitted
287 floppyset > $PREFIX
288 PAD=$(( 512 - ($(stat -c %s $PREFIX) % 512) ))
289 [ $PAD -ne 512 ] && ddq if=/dev/zero bs=1 count=$PAD >> $PREFIX
290 exit
291 fi
292 floppyset | split -b ${FORMAT}k /dev/stdin floppy$$
293 i=1
294 ls floppy$$* 2> /dev/null | while read file ; do
295 output=$PREFIX$(printf "%03d" $i)
296 cat $file /dev/zero | ddq bs=1k count=$FORMAT conv=sync of=$output
297 echo $output
298 rm -f $file
299 i=$(( $i + 1 ))
300 done