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