1 #include <u.h> 2 #include <libc.h> 3 #include <bio.h> 4 #include <libsec.h> 5 6 #include "iso9660.h" 7 8 /* FreeBSD 4.5 installation CD for reference 9 g% cdsector 17 | xd -b 10 1+0 records in 11 1+0 records out 12 0000000 00 - volume descriptor type (0) 13 43 44 30 30 31 - "CD001" 14 01 - volume descriptor version (1) 15 45 4c 20 54 4f 52 49 54 4f 16 0000010 20 53 50 45 43 49 46 49 43 41 54 49 4f 4e 00 00 17 0000020 00 00 00 00 00 00 00 - 7-39 boot system identifier 18 "EL TORITO SPECIFICATION" 19 20 00 00 00 00 00 00 00 00 00 21 0000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 22 0000040 00 00 00 00 00 00 00 - 39-71 boot identifier 23 24 boot system use: 25 26 absolute pointer to the boot catalog?? 27 28 4d 0c 00 00 00 00 00 00 00 29 0000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 30 0000580 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 31 0000590 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 32 00005a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 33 g% cdsector 3149 | xd -b # 0x0c4d 34 1+0 records in 35 1+0 records out 36 0000000 01 - header (1) 37 00 - platform id (0 = 0x86) 38 00 00 - reserved 0 39 00 00 00 00 00 00 00 00 00 00 00 00 40 0000010 00 00 00 00 00 00 00 00 00 00 00 00 - id string 41 aa 55 - checksum 42 55 aa - magic 43 44 0000020 88 - 88 = bootable 45 03 - 3 = 2.88MB diskette 46 00 00 - load segment 0 means default 0x7C0 47 00 - system type (byte 5 of boot image) 48 00 - unused (0) 49 01 00 - 512-byte sector count for initial load 50 4e 0c 00 00 - ptr to virtual disk 51 00 00 00 00 52 0000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 53 0000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 54 0000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 0000060 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 56 g% cdsector `{h2d 0c4e} | xd -b 57 1+0 records in 58 1+0 records out 59 0000000 eb 3c 00 00 00 00 00 00 00 00 00 00 02 00 00 00 60 0000010 00 00 00 00 00 00 00 00 12 00 02 00 00 00 00 00 61 0000020 00 00 00 00 00 16 1f 66 6a 00 51 50 06 53 62 31 c0 63 64 FREEBSD 65 0000000 eb 3c 00 00 00 00 00 00 00 00 00 00 02 00 00 00 66 0000010 00 00 00 00 00 00 00 00 12 00 02 00 00 00 00 00 67 0000020 00 00 00 00 00 16 1f 66 6a 00 51 50 06 53 68 31 c0 69 70 DOS 5 71 0000000 eb 3c 90 4d 53 44 4f 53 35 2e 30 00 02 01 01 00 72 0000010 02 e0 00 40 0b f0 09 00 12 00 02 00 00 00 00 00 73 0000020 00 00 00 00 00 00 29 6a 2c e0 16 4e 4f 20 4e 41 74 0000030 4d 45 20 20 20 20 46 41 54 31 32 20 20 20 fa 33 75 0000040 c0 8e d0 bc 00 7c 16 07 bb 78 00 36 c5 37 1e 56 76 0000050 16 53 bf 3e 7c b9 0b 00 fc f3 a4 06 1f c6 45 fe 77 0000060 0f 8b 0e 18 7c 88 4d f9 89 47 02 c7 07 3e 7c fb 78 0000070 cd 13 72 79 33 c0 39 06 13 7c 74 08 8b 0e 13 7c 79 0000080 89 0e 20 7c a0 10 7c f7 26 16 7c 03 06 1c 7c 13 80 0000090 16 1e 7c 03 06 0e 7c 83 d2 00 a3 50 7c 89 16 52 81 00000a0 7c a3 49 7c 89 16 4b 7c b8 20 00 f7 26 11 7c 8b 82 83 NDISK 84 0000000 eb 3c 90 50 6c 61 6e 39 2e 30 30 00 02 01 01 00 85 0000010 02 e0 00 40 0b f0 09 00 12 00 02 00 00 00 00 00 86 0000020 40 0b 00 00 00 00 29 13 00 00 00 43 59 4c 49 4e 87 0000030 44 52 49 43 41 4c 46 41 54 31 32 20 20 20 fa 31 88 0000040 c0 8e d0 8e d8 8e c0 bc ec 7b 89 e5 88 56 12 fb 89 0000050 be ea 7d bf 90 7d ff d7 bf 82 7d ff d7 8b 06 27 90 0000060 7c 8b 16 29 7c bb 00 7e bf 2c 7d ff d7 bb 10 00 91 92 PBSDISK 93 0000000 eb 3c 90 50 6c 61 6e 39 2e 30 30 00 02 01 01 00 94 0000010 02 e0 00 40 0b f0 09 00 12 00 02 00 00 00 00 00 95 0000020 40 0b 00 00 00 00 29 13 00 00 00 43 59 4c 49 4e 96 0000030 44 52 49 43 41 4c 46 41 54 31 32 20 20 20 fa 31 97 0000040 c0 8e d0 8e d8 8e c0 bc f8 7b 89 e5 88 56 00 fb 98 0000050 be f8 7d bf 00 7d ff d7 bf df 7c ff d7 8b 06 27 99 0000060 7c 8b 16 29 7c bb 00 7e bf 89 7c ff d7 bf fb 7c 100 */ 101 102 void 103 Cputbootvol(Cdimg *cd) 104 { 105 Cputc(cd, 0x00); 106 Cputs(cd, "CD001", 5); 107 Cputc(cd, 0x01); 108 Cputs(cd, "EL TORITO SPECIFICATION", 2+1+6+1+13); 109 Crepeat(cd, 0, 2+16+16+7); 110 cd->bootcatptr = Cwoffset(cd); 111 Cpadblock(cd); 112 } 113 114 void 115 Cupdatebootvol(Cdimg *cd) 116 { 117 ulong o; 118 119 o = Cwoffset(cd); 120 Cwseek(cd, cd->bootcatptr); 121 Cputnl(cd, cd->bootcatblock, 4); 122 Cwseek(cd, o); 123 } 124 125 void 126 Cputbootcat(Cdimg *cd) 127 { 128 cd->bootcatblock = Cwoffset(cd) / Blocksize; 129 Cputc(cd, 0x01); 130 Cputc(cd, 0x00); 131 Cputc(cd, 0x00); 132 Cputc(cd, 0x00); 133 Crepeat(cd, 0, 12+12); 134 135 /* 136 * either the checksum doesn't include the header word 137 * or it just doesn't matter. 138 */ 139 Cputc(cd, 0xAA); 140 Cputc(cd, 0x55); 141 Cputc(cd, 0x55); 142 Cputc(cd, 0xAA); 143 144 cd->bootimageptr = Cwoffset(cd); 145 Cpadblock(cd); 146 } 147 148 void 149 Cupdatebootcat(Cdimg *cd) 150 { 151 ulong o; 152 153 if(cd->bootdirec == nil) 154 return; 155 156 o = Cwoffset(cd); 157 Cwseek(cd, cd->bootimageptr); 158 Cputc(cd, 0x88); 159 switch(cd->bootdirec->length){ 160 default: 161 fprint(2, "warning: boot image is not 1.44MB or 2.88MB; pretending 1.44MB\n"); 162 case 1440*1024: 163 Cputc(cd, 0x02); /* 1.44MB disk */ 164 break; 165 case 2880*1024: 166 Cputc(cd, 0x03); /* 2.88MB disk */ 167 break; 168 } 169 Cputnl(cd, 0, 2); /* load segment */ 170 Cputc(cd, 0); /* system type */ 171 Cputc(cd, 0); /* unused */ 172 Cputnl(cd, 1, 2); /* 512-byte sector count for load */ 173 Cputnl(cd, cd->bootdirec->block, 4); /* ptr to disk image */ 174 Cwseek(cd, o); 175 } 176 177 void 178 findbootimage(Cdimg *cd, Direc *root) 179 { 180 Direc *d; 181 182 d = walkdirec(root, cd->bootimage); 183 if(d == nil){ 184 fprint(2, "warning: did not encounter boot image\n"); 185 return; 186 } 187 188 cd->bootdirec = d; 189 } 190