disk/part_iso.c

   1 /*
   2  * (C) Copyright 2001
   3  * Denis Peter, MPL AG Switzerland, d.peter@mpl.ch.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <command.h>
  26 #include "part_iso.h"
  27
  28 #ifdef HAVE_BLOCK_DEVICE
  29
  30 /* #define      ISO_PART_DEBUG */
  31
  32 #ifdef  ISO_PART_DEBUG
  33 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  34 #else
  35 #define PRINTF(fmt,args...)
  36 #endif
  37
  38 /* enable this if CDs are written with the PowerPC Platform ID */
  39 #undef CHECK_FOR_POWERPC_PLATTFORM
  40 #define CD_SECTSIZE 2048
  41
  42 static unsigned char tmpbuf[CD_SECTSIZE];
  43
  44 /* Convert char[4] in little endian format to the host format integer
  45  */
  46 static inline unsigned long le32_to_int(unsigned char *le32)
  47 {
  48     return ((le32[3] << 24) +
  49             (le32[2] << 16) +
  50             (le32[1] << 8) +
  51              le32[0]
  52            );
  53 }
  54 /* Convert char[2] in little endian format to the host format integer
  55  */
  56 static inline unsigned short le16_to_int(unsigned char *le16)
  57 {
  58     return ((le16[1] << 8) +
  59            le16[0]
  60            );
  61 }
  62
  63
  64 /* only boot records will be listed as valid partitions */
  65 int get_partition_info_iso_verb(block_dev_desc_t * dev_desc, int part_num, disk_partition_t * info, int verb)
  66 {
  67         int i,offset,entry_num;
  68         unsigned short *chksumbuf;
  69         unsigned short chksum;
  70         unsigned long newblkaddr,blkaddr,lastsect,bootaddr;
  71         iso_boot_rec_t *pbr = (iso_boot_rec_t   *)tmpbuf; /* boot record */
  72         iso_pri_rec_t *ppr = (iso_pri_rec_t     *)tmpbuf;       /* primary desc */
  73         iso_val_entry_t *pve = (iso_val_entry_t *)tmpbuf;
  74         iso_init_def_entry_t *pide;
  75
  76         if (dev_desc->blksz != CD_SECTSIZE)
  77                 return -1;
  78
  79         /* the first sector (sector 0x10) must be a primary volume desc */
  80         blkaddr=PVD_OFFSET;
  81         if (dev_desc->block_read (dev_desc->dev, PVD_OFFSET, 1, (ulong *) tmpbuf) != 1)
  82         return (-1);
  83         if(ppr->desctype!=0x01) {
  84                 if(verb)
  85                         printf ("** First descriptor is NOT a primary desc on %d:%d **\n",
  86                                 dev_desc->dev, part_num);
  87                 return (-1);
  88         }
  89         if(strncmp((char *)ppr->stand_ident,"CD001",5)!=0) {
  90                 if(verb)
  91                         printf ("** Wrong ISO Ident: %s on %d:%d **\n",
  92                                 ppr->stand_ident,dev_desc->dev, part_num);
  93                 return (-1);
  94         }
  95         lastsect= ((ppr->firstsek_LEpathtab1_LE & 0x000000ff)<<24) +
  96                   ((ppr->firstsek_LEpathtab1_LE & 0x0000ff00)<< 8) +
  97                   ((ppr->firstsek_LEpathtab1_LE & 0x00ff0000)>> 8) +
  98                   ((ppr->firstsek_LEpathtab1_LE & 0xff000000)>>24) ;
  99         info->blksz=ppr->secsize_BE; /* assuming same block size for all entries */
 100         PRINTF(" Lastsect:%08lx\n",lastsect);
 101         for(i=blkaddr;i<lastsect;i++) {
 102                 PRINTF("Reading block %d\n", i);
 103                 if (dev_desc->block_read (dev_desc->dev, i, 1, (ulong *) tmpbuf) != 1)
 104                 return (-1);
 105                 if(ppr->desctype==0x00)
 106                         break; /* boot entry found */
 107                 if(ppr->desctype==0xff) {
 108                         if(verb)
 109                                 printf ("** No valid boot catalog found on %d:%d **\n",
 110                                         dev_desc->dev, part_num);
 111                         return (-1);
 112                 }
 113         }
 114         /* boot entry found */
 115         if(strncmp(pbr->ident_str,"EL TORITO SPECIFICATION",23)!=0) {
 116                 if(verb)
 117                         printf ("** Wrong El Torito ident: %s on %d:%d **\n",
 118                                 pbr->ident_str,dev_desc->dev, part_num);
 119                 return (-1);
 120         }
 121         bootaddr=le32_to_int(pbr->pointer);
 122         PRINTF(" Boot Entry at: %08lX\n",bootaddr);
 123         if (dev_desc->block_read (dev_desc->dev, bootaddr, 1, (ulong *) tmpbuf) != 1) {
 124                 if(verb)
 125                         printf ("** Can't read Boot Entry at %lX on %d:%d **\n",
 126                                 bootaddr,dev_desc->dev, part_num);
 127                 return (-1);
 128         }
 129         chksum=0;
 130         chksumbuf = (unsigned short *)tmpbuf;
 131         for(i=0;i<0x10;i++)
 132                 chksum+=((chksumbuf[i] &0xff)<<8)+((chksumbuf[i] &0xff00)>>8);
 133         if(chksum!=0) {
 134                 if(verb)
 135                         printf ("** Checksum Error in booting catalog validation entry on %d:%d **\n",
 136                                 dev_desc->dev, part_num);
 137                 return (-1);
 138         }
 139         if((pve->key[0]!=0x55)||(pve->key[1]!=0xAA)) {
 140                 if(verb)
 141                         printf ("** Key 0x55 0xAA error on %d:%d **\n",
 142                                 dev_desc->dev, part_num);
 143                 return(-1);
 144         }
 145 #ifdef CHECK_FOR_POWERPC_PLATTFORM
 146         if(pve->platform!=0x01) {
 147                 if(verb)
 148                         printf ("** No PowerPC platform CD on %d:%d **\n",
 149                                 dev_desc->dev, part_num);
 150                 return(-1);
 151         }
 152 #endif
 153         /* the validation entry seems to be ok, now search the "partition" */
 154         entry_num=0;
 155         offset=0x20;
 156         sprintf ((char *)info->type, "U-Boot");
 157         switch(dev_desc->if_type) {
 158                 case IF_TYPE_IDE:
 159                 case IF_TYPE_SATA:
 160                 case IF_TYPE_ATAPI:
 161                         sprintf ((char *)info->name, "hd%c%d",
 162                                 'a' + dev_desc->dev, part_num);
 163                         break;
 164                 case IF_TYPE_SCSI:
 165                         sprintf ((char *)info->name, "sd%c%d",
 166                                 'a' + dev_desc->dev, part_num);
 167                         break;
 168                 case IF_TYPE_USB:
 169                         sprintf ((char *)info->name, "usbd%c%d",
 170                                 'a' + dev_desc->dev, part_num);
 171                         break;
 172                 case IF_TYPE_DOC:
 173                         sprintf ((char *)info->name, "docd%c%d",
 174                                 'a' + dev_desc->dev, part_num);
 175                         break;
 176                 default:
 177                         sprintf ((char *)info->name, "xx%c%d",
 178                                 'a' + dev_desc->dev, part_num);
 179                         break;
 180         }
 181         /* the bootcatalog (including validation Entry) is limited to 2048Bytes
 182          * (63 boot entries + validation entry) */
 183          while(offset<2048) {
 184                 pide=(iso_init_def_entry_t *)&tmpbuf[offset];
 185                 if ((pide->boot_ind==0x88) ||
 186                     (pide->boot_ind==0x00)) { /* Header Id for default Sections Entries */
 187                         if(entry_num==part_num) { /* part found */
 188                                 goto found;
 189                         }
 190                         entry_num++; /* count partitions Entries (boot and non bootables */
 191                         offset+=0x20;
 192                         continue;
 193                 }
 194                 if ((pide->boot_ind==0x90) ||   /* Section Header Entry */
 195                     (pide->boot_ind==0x91) ||   /* Section Header Entry (last) */
 196                     (pide->boot_ind==0x44)) {   /* Extension Indicator */
 197                         offset+=0x20; /* skip unused entries */
 198                 }
 199                 else {
 200                         if(verb)
 201                                 printf ("** Partition %d not found on device %d **\n",
 202                                         part_num,dev_desc->dev);
 203                         return(-1);
 204                 }
 205         }
 206         /* if we reach this point entire sector has been
 207          * searched w/o succsess */
 208         if(verb)
 209                 printf ("** Partition %d not found on device %d **\n",
 210                         part_num,dev_desc->dev);
 211         return(-1);
 212 found:
 213         if(pide->boot_ind!=0x88) {
 214                 if(verb)
 215                         printf ("** Partition %d is not bootable on device %d **\n",
 216                                 part_num,dev_desc->dev);
 217                 return (-1);
 218         }
 219         switch(pide->boot_media) {
 220                 case 0x00: /* no emulation */
 221                         info->size=le16_to_int(pide->sec_cnt)>>2;
 222                         break;
 223                 case 0x01:      info->size=2400>>2; break; /* 1.2MByte Floppy */
 224                 case 0x02:      info->size=2880>>2; break; /* 1.44MByte Floppy */
 225                 case 0x03:      info->size=5760>>2; break; /* 2.88MByte Floppy */
 226                 case 0x04:      info->size=2880>>2; break; /* dummy (HD Emulation) */
 227                 default:        info->size=0; break;
 228         }
 229         newblkaddr=le32_to_int(pide->rel_block_addr);
 230         info->start=newblkaddr;
 231         PRINTF(" part %d found @ %lx size %lx\n",part_num,newblkaddr,info->size);
 232         return 0;
 233 }
 234
 235 int get_partition_info_iso(block_dev_desc_t * dev_desc, int part_num, disk_partition_t * info)
 236 {
 237         return(get_partition_info_iso_verb(dev_desc, part_num, info, 1));
 238 }
 239
 240
 241 void print_part_iso(block_dev_desc_t * dev_desc)
 242 {
 243         disk_partition_t info;
 244         int i;
 245         if(get_partition_info_iso_verb(dev_desc,0,&info,0)==-1) {
 246                 printf("** No boot partition found on device %d **\n",dev_desc->dev);
 247                 return;
 248         }
 249         printf("Part   Start     Sect x Size Type\n");
 250         i=0;
 251         do {
 252                 printf (" %2d %8ld %8ld %6ld %.32s\n",
 253                         i, info.start, info.size, info.blksz, info.type);
 254                 i++;
 255         } while (get_partition_info_iso_verb(dev_desc,i,&info,0)!=-1);
 256 }
 257
 258 int test_part_iso (block_dev_desc_t *dev_desc)
 259 {
 260         disk_partition_t info;
 261
 262         return(get_partition_info_iso_verb(dev_desc,0,&info,0));
 263 }
 264
 265 #endif