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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <libsec.h>
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#include "iso9660.h"
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7 |
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/* FreeBSD 4.5 installation CD for reference
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9 |
g% cdsector 17 | xd -b
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10 |
1+0 records in
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11 |
1+0 records out
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12 |
0000000 00 - volume descriptor type (0)
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43 44 30 30 31 - "CD001"
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01 - volume descriptor version (1)
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45 4c 20 54 4f 52 49 54 4f
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0000010 20 53 50 45 43 49 46 49 43 41 54 49 4f 4e 00 00
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0000020 00 00 00 00 00 00 00 - 7-39 boot system identifier
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18 |
"EL TORITO SPECIFICATION"
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19 |
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20 |
00 00 00 00 00 00 00 00 00
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21 |
0000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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22 |
0000040 00 00 00 00 00 00 00 - 39-71 boot identifier
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23 |
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24 |
boot system use:
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25 |
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absolute pointer to the boot catalog??
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27 |
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28 |
4d 0c 00 00 00 00 00 00 00
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29 |
0000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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30 |
0000580 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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31 |
0000590 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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32 |
00005a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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33 |
g% cdsector 3149 | xd -b # 0x0c4d
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34 |
1+0 records in
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35 |
1+0 records out
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0000000 01 - header (1)
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00 - platform id (0 = 0x86)
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00 00 - reserved 0
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00 00 00 00 00 00 00 00 00 00 00 00
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0000010 00 00 00 00 00 00 00 00 00 00 00 00 - id string
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aa 55 - checksum
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55 aa - magic
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43 |
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0000020 88 - 88 = bootable
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03 - 3 = 2.88MB diskette
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00 00 - load segment 0 means default 0x7C0
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00 - system type (byte 5 of boot image)
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00 - unused (0)
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01 00 - 512-byte sector count for initial load
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4e 0c 00 00 - ptr to virtual disk
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00 00 00 00
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0000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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55 |
0000060 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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56 |
g% cdsector `{h2d 0c4e} | xd -b
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1+0 records in
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1+0 records out
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0000000 eb 3c 00 00 00 00 00 00 00 00 00 00 02 00 00 00
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0000010 00 00 00 00 00 00 00 00 12 00 02 00 00 00 00 00
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0000020 00 00 00 00 00 16 1f 66 6a 00 51 50 06 53
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31 c0
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63 |
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FREEBSD
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0000000 eb 3c 00 00 00 00 00 00 00 00 00 00 02 00 00 00
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0000010 00 00 00 00 00 00 00 00 12 00 02 00 00 00 00 00
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0000020 00 00 00 00 00 16 1f 66 6a 00 51 50 06 53
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31 c0
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69 |
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DOS 5
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0000000 eb 3c 90 4d 53 44 4f 53 35 2e 30 00 02 01 01 00
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0000010 02 e0 00 40 0b f0 09 00 12 00 02 00 00 00 00 00
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0000020 00 00 00 00 00 00 29 6a 2c e0 16 4e 4f 20 4e 41
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0000030 4d 45 20 20 20 20 46 41 54 31 32 20 20 20 fa 33
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0000040 c0 8e d0 bc 00 7c 16 07 bb 78 00 36 c5 37 1e 56
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0000050 16 53 bf 3e 7c b9 0b 00 fc f3 a4 06 1f c6 45 fe
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0000060 0f 8b 0e 18 7c 88 4d f9 89 47 02 c7 07 3e 7c fb
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0000070 cd 13 72 79 33 c0 39 06 13 7c 74 08 8b 0e 13 7c
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0000080 89 0e 20 7c a0 10 7c f7 26 16 7c 03 06 1c 7c 13
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0000090 16 1e 7c 03 06 0e 7c 83 d2 00 a3 50 7c 89 16 52
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00000a0 7c a3 49 7c 89 16 4b 7c b8 20 00 f7 26 11 7c 8b
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NDISK
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0000000 eb 3c 90 50 6c 61 6e 39 2e 30 30 00 02 01 01 00
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0000010 02 e0 00 40 0b f0 09 00 12 00 02 00 00 00 00 00
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0000020 40 0b 00 00 00 00 29 13 00 00 00 43 59 4c 49 4e
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0000030 44 52 49 43 41 4c 46 41 54 31 32 20 20 20 fa 31
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0000040 c0 8e d0 8e d8 8e c0 bc ec 7b 89 e5 88 56 12 fb
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0000050 be ea 7d bf 90 7d ff d7 bf 82 7d ff d7 8b 06 27
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0000060 7c 8b 16 29 7c bb 00 7e bf 2c 7d ff d7 bb 10 00
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PBSDISK
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0000000 eb 3c 90 50 6c 61 6e 39 2e 30 30 00 02 01 01 00
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0000010 02 e0 00 40 0b f0 09 00 12 00 02 00 00 00 00 00
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0000020 40 0b 00 00 00 00 29 13 00 00 00 43 59 4c 49 4e
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0000030 44 52 49 43 41 4c 46 41 54 31 32 20 20 20 fa 31
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0000040 c0 8e d0 8e d8 8e c0 bc f8 7b 89 e5 88 56 00 fb
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0000050 be f8 7d bf 00 7d ff d7 bf df 7c ff d7 8b 06 27
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0000060 7c 8b 16 29 7c bb 00 7e bf 89 7c ff d7 bf fb 7c
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*/
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void
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Cputbootvol(Cdimg *cd)
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{
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Cputc(cd, 0x00);
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Cputs(cd, "CD001", 5);
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Cputc(cd, 0x01);
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Cputs(cd, "EL TORITO SPECIFICATION", 2+1+6+1+13);
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Crepeat(cd, 0, 2+16+16+7);
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cd->bootcatptr = Cwoffset(cd);
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Cpadblock(cd);
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}
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void
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Cupdatebootvol(Cdimg *cd)
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{
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uvlong o;
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o = Cwoffset(cd);
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Cwseek(cd, cd->bootcatptr);
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Cputnl(cd, cd->bootcatblock, 4);
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Cwseek(cd, o);
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}
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void
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Cputbootcat(Cdimg *cd)
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{
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cd->bootcatblock = Cwoffset(cd) / Blocksize;
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Cputc(cd, 0x01);
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Cputc(cd, 0x00);
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Cputc(cd, 0x00);
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Cputc(cd, 0x00);
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Crepeat(cd, 0, 12+12);
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/*
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* either the checksum doesn't include the header word
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* or it just doesn't matter.
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*/
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Cputc(cd, 0xAA);
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Cputc(cd, 0x55);
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Cputc(cd, 0x55);
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Cputc(cd, 0xAA);
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cd->bootimageptr = Cwoffset(cd);
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Cpadblock(cd);
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}
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enum {
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Emusectsz = 512, /* bytes per emulated sector */
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};
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void
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Cupdatebootcat(Cdimg *cd)
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{
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uvlong o;
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int n;
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if(cd->bootdirec == nil)
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return;
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o = Cwoffset(cd);
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Cwseek(cd, cd->bootimageptr);
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Cputc(cd, 0x88);
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if(cd->flags & CDbootnoemu)
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Cputc(cd, 0); /* no disk emulation */
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else
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switch(cd->bootdirec->length){
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default:
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fprint(2, "warning: boot image is not 1.44MB or 2.88MB; "
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"pretending 1.44MB\n");
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/* fall through */
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case 1440*1024:
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Cputc(cd, 0x02); /* 1.44MB disk */
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break;
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case 2880*1024:
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Cputc(cd, 0x03); /* 2.88MB disk */
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break;
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}
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Cputnl(cd, 0, 2); /* load segment */
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Cputc(cd, 0); /* system type */
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Cputc(cd, 0); /* unused */
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n = 1;
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if(cd->flags & CDbootnoemu){
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n = (cd->bootdirec->length + Emusectsz - 1) / Emusectsz;
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if(n > 4){
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fprint(2, "warning: boot image too big; "
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"will only load the first 2K\n");
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n = 4;
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}
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}
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Cputnl(cd, n, 2); /* Emusectsz-byte sector count for load */
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Cputnl(cd, cd->bootdirec->block, 4); /* ptr to disk image */
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Cwseek(cd, o);
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}
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void
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Cfillpbs(Cdimg *cd)
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{
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uvlong o;
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int n;
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if(cd->bootdirec == nil || cd->loaderdirec == nil)
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return;
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o = Cwoffset(cd);
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Cwseek(cd, 3 + cd->bootdirec->block * Blocksize); /* jmp over magic */
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208 |
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Cputnl(cd, cd->loaderdirec->block, 4); /* ptr to loader */
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n = (cd->loaderdirec->length + Blocksize - 1) / Blocksize;
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Cputnl(cd, n, 4); /* loader size */
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Cputnl(cd, Blocksize, 4); /* loader size */
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Cwseek(cd, o);
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}
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void
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findbootimage(Cdimg *cd, Direc *root)
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{
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Direc *d;
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d = walkdirec(root, cd->bootimage);
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if(d == nil){
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fprint(2, "warning: did not encounter boot image\n");
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return;
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}
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cd->bootdirec = d;
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}
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void
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findloader(Cdimg *cd, Direc *root)
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{
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Direc *d;
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d = walkdirec(root, cd->loader);
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if(d == nil){
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fprint(2, "warning: did not encounter boot loader\n");
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return;
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}
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cd->loaderdirec = d;
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}
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