diff options
Diffstat (limited to 'src/cmd/9660/boot.c')
| -rw-r--r-- | src/cmd/9660/boot.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/src/cmd/9660/boot.c b/src/cmd/9660/boot.c new file mode 100644 index 00000000..9cae9582 --- /dev/null +++ b/src/cmd/9660/boot.c @@ -0,0 +1,189 @@ +#include <u.h> +#include <libc.h> +#include <bio.h> +#include <libsec.h> + +#include "iso9660.h" + +/* FreeBSD 4.5 installation CD for reference +g% cdsector 17 | xd -b +1+0 records in +1+0 records out +0000000 00 - volume descriptor type (0) + 43 44 30 30 31 - "CD001" + 01 - volume descriptor version (1) + 45 4c 20 54 4f 52 49 54 4f +0000010 20 53 50 45 43 49 46 49 43 41 54 49 4f 4e 00 00 +0000020 00 00 00 00 00 00 00 - 7-39 boot system identifier +"EL TORITO SPECIFICATION" + + 00 00 00 00 00 00 00 00 00 +0000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +0000040 00 00 00 00 00 00 00 - 39-71 boot identifier + +boot system use: + +absolute pointer to the boot catalog?? + + 4d 0c 00 00 00 00 00 00 00 +0000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +0000580 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +0000590 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +00005a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +g% cdsector 3149 | xd -b # 0x0c4d +1+0 records in +1+0 records out +0000000 01 - header (1) + 00 - platform id (0 = 0x86) + 00 00 - reserved 0 + 00 00 00 00 00 00 00 00 00 00 00 00 +0000010 00 00 00 00 00 00 00 00 00 00 00 00 - id string + aa 55 - checksum + 55 aa - magic + +0000020 88 - 88 = bootable + 03 - 3 = 2.88MB diskette + 00 00 - load segment 0 means default 0x7C0 + 00 - system type (byte 5 of boot image) + 00 - unused (0) + 01 00 - 512-byte sector count for initial load + 4e 0c 00 00 - ptr to virtual disk + 00 00 00 00 +0000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +0000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +0000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +0000060 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +g% cdsector `{h2d 0c4e} | xd -b +1+0 records in +1+0 records out +0000000 eb 3c 00 00 00 00 00 00 00 00 00 00 02 00 00 00 +0000010 00 00 00 00 00 00 00 00 12 00 02 00 00 00 00 00 +0000020 00 00 00 00 00 16 1f 66 6a 00 51 50 06 53 + 31 c0 + +FREEBSD +0000000 eb 3c 00 00 00 00 00 00 00 00 00 00 02 00 00 00 +0000010 00 00 00 00 00 00 00 00 12 00 02 00 00 00 00 00 +0000020 00 00 00 00 00 16 1f 66 6a 00 51 50 06 53 + 31 c0 + +DOS 5 +0000000 eb 3c 90 4d 53 44 4f 53 35 2e 30 00 02 01 01 00 +0000010 02 e0 00 40 0b f0 09 00 12 00 02 00 00 00 00 00 +0000020 00 00 00 00 00 00 29 6a 2c e0 16 4e 4f 20 4e 41 +0000030 4d 45 20 20 20 20 46 41 54 31 32 20 20 20 fa 33 +0000040 c0 8e d0 bc 00 7c 16 07 bb 78 00 36 c5 37 1e 56 +0000050 16 53 bf 3e 7c b9 0b 00 fc f3 a4 06 1f c6 45 fe +0000060 0f 8b 0e 18 7c 88 4d f9 89 47 02 c7 07 3e 7c fb +0000070 cd 13 72 79 33 c0 39 06 13 7c 74 08 8b 0e 13 7c +0000080 89 0e 20 7c a0 10 7c f7 26 16 7c 03 06 1c 7c 13 +0000090 16 1e 7c 03 06 0e 7c 83 d2 00 a3 50 7c 89 16 52 +00000a0 7c a3 49 7c 89 16 4b 7c b8 20 00 f7 26 11 7c 8b + +NDISK +0000000 eb 3c 90 50 6c 61 6e 39 2e 30 30 00 02 01 01 00 +0000010 02 e0 00 40 0b f0 09 00 12 00 02 00 00 00 00 00 +0000020 40 0b 00 00 00 00 29 13 00 00 00 43 59 4c 49 4e +0000030 44 52 49 43 41 4c 46 41 54 31 32 20 20 20 fa 31 +0000040 c0 8e d0 8e d8 8e c0 bc ec 7b 89 e5 88 56 12 fb +0000050 be ea 7d bf 90 7d ff d7 bf 82 7d ff d7 8b 06 27 +0000060 7c 8b 16 29 7c bb 00 7e bf 2c 7d ff d7 bb 10 00 + +PBSDISK +0000000 eb 3c 90 50 6c 61 6e 39 2e 30 30 00 02 01 01 00 +0000010 02 e0 00 40 0b f0 09 00 12 00 02 00 00 00 00 00 +0000020 40 0b 00 00 00 00 29 13 00 00 00 43 59 4c 49 4e +0000030 44 52 49 43 41 4c 46 41 54 31 32 20 20 20 fa 31 +0000040 c0 8e d0 8e d8 8e c0 bc f8 7b 89 e5 88 56 00 fb +0000050 be f8 7d bf 00 7d ff d7 bf df 7c ff d7 8b 06 27 +0000060 7c 8b 16 29 7c bb 00 7e bf 89 7c ff d7 bf fb 7c +*/ + +void +Cputbootvol(Cdimg *cd) +{ + Cputc(cd, 0x00); + Cputs(cd, "CD001", 5); + Cputc(cd, 0x01); + Cputs(cd, "EL TORITO SPECIFICATION", 2+1+6+1+13); + Crepeat(cd, 0, 2+16+16+7); + cd->bootcatptr = Cwoffset(cd); + Cpadblock(cd); +} + +void +Cupdatebootvol(Cdimg *cd) +{ + ulong o; + + o = Cwoffset(cd); + Cwseek(cd, cd->bootcatptr); + Cputnl(cd, cd->bootcatblock, 4); + Cwseek(cd, o); +} + +void +Cputbootcat(Cdimg *cd) +{ + cd->bootcatblock = Cwoffset(cd) / Blocksize; + Cputc(cd, 0x01); + Cputc(cd, 0x00); + Cputc(cd, 0x00); + Cputc(cd, 0x00); + Crepeat(cd, 0, 12+12); + + /* + * either the checksum doesn't include the header word + * or it just doesn't matter. + */ + Cputc(cd, 0xAA); + Cputc(cd, 0x55); + Cputc(cd, 0x55); + Cputc(cd, 0xAA); + + cd->bootimageptr = Cwoffset(cd); + Cpadblock(cd); +} + +void +Cupdatebootcat(Cdimg *cd) +{ + ulong o; + + if(cd->bootdirec == nil) + return; + + o = Cwoffset(cd); + Cwseek(cd, cd->bootimageptr); + Cputc(cd, 0x88); + switch(cd->bootdirec->length){ + default: + fprint(2, "warning: boot image is not 1.44MB or 2.88MB; pretending 1.44MB\n"); + case 1440*1024: + Cputc(cd, 0x02); /* 1.44MB disk */ + break; + case 2880*1024: + Cputc(cd, 0x03); /* 2.88MB disk */ + break; + } + Cputnl(cd, 0, 2); /* load segment */ + Cputc(cd, 0); /* system type */ + Cputc(cd, 0); /* unused */ + Cputnl(cd, 1, 2); /* 512-byte sector count for load */ + Cputnl(cd, cd->bootdirec->block, 4); /* ptr to disk image */ + Cwseek(cd, o); +} + +void +findbootimage(Cdimg *cd, Direc *root) +{ + Direc *d; + + d = walkdirec(root, cd->bootimage); + if(d == nil){ + fprint(2, "warning: did not encounter boot image\n"); + return; + } + + cd->bootdirec = d; +} |