disk/part_iso.c

   1 /*
   2  * (C) Copyright 2001
   3  * Denis Peter, MPL AG Switzerland, d.peter@mpl.ch.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10 #include "part_iso.h"
  11
  12 #ifdef HAVE_BLOCK_DEVICE
  13
  14 /* #define      ISO_PART_DEBUG */
  15
  16 #ifdef  ISO_PART_DEBUG
  17 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  18 #else
  19 #define PRINTF(fmt,args...)
  20 #endif
  21
  22 /* enable this if CDs are written with the PowerPC Platform ID */
  23 #undef CHECK_FOR_POWERPC_PLATTFORM
  24 #define CD_SECTSIZE 2048
  25
  26 static unsigned char tmpbuf[CD_SECTSIZE];
  27
  28 /* Convert char[4] in little endian format to the host format integer
  29  */
  30 static inline unsigned long le32_to_int(unsigned char *le32)
  31 {
  32     return ((le32[3] << 24) +
  33             (le32[2] << 16) +
  34             (le32[1] << 8) +
  35              le32[0]
  36            );
  37 }
  38 /* Convert char[2] in little endian format to the host format integer
  39  */
  40 static inline unsigned short le16_to_int(unsigned char *le16)
  41 {
  42     return ((le16[1] << 8) +
  43            le16[0]
  44            );
  45 }
  46
  47
  48 /* only boot records will be listed as valid partitions */
  49 int get_partition_info_iso_verb(block_dev_desc_t * dev_desc, int part_num, disk_partition_t * info, int verb)
  50 {
  51         int i,offset,entry_num;
  52         unsigned short *chksumbuf;
  53         unsigned short chksum;
  54         unsigned long newblkaddr,blkaddr,lastsect,bootaddr;
  55         iso_boot_rec_t *pbr = (iso_boot_rec_t   *)tmpbuf; /* boot record */
  56         iso_pri_rec_t *ppr = (iso_pri_rec_t     *)tmpbuf;       /* primary desc */
  57         iso_val_entry_t *pve = (iso_val_entry_t *)tmpbuf;
  58         iso_init_def_entry_t *pide;
  59
  60         if (dev_desc->blksz != CD_SECTSIZE)
  61                 return -1;
  62
  63         /* the first sector (sector 0x10) must be a primary volume desc */
  64         blkaddr=PVD_OFFSET;
  65         if (dev_desc->block_read (dev_desc->dev, PVD_OFFSET, 1, (ulong *) tmpbuf) != 1)
  66         return (-1);
  67         if(ppr->desctype!=0x01) {
  68                 if(verb)
  69                         printf ("** First descriptor is NOT a primary desc on %d:%d **\n",
  70                                 dev_desc->dev, part_num);
  71                 return (-1);
  72         }
  73         if(strncmp((char *)ppr->stand_ident,"CD001",5)!=0) {
  74                 if(verb)
  75                         printf ("** Wrong ISO Ident: %s on %d:%d **\n",
  76                                 ppr->stand_ident,dev_desc->dev, part_num);
  77                 return (-1);
  78         }
  79         lastsect= ((ppr->firstsek_LEpathtab1_LE & 0x000000ff)<<24) +
  80                   ((ppr->firstsek_LEpathtab1_LE & 0x0000ff00)<< 8) +
  81                   ((ppr->firstsek_LEpathtab1_LE & 0x00ff0000)>> 8) +
  82                   ((ppr->firstsek_LEpathtab1_LE & 0xff000000)>>24) ;
  83         info->blksz=ppr->secsize_BE; /* assuming same block size for all entries */
  84         PRINTF(" Lastsect:%08lx\n",lastsect);
  85         for(i=blkaddr;i<lastsect;i++) {
  86                 PRINTF("Reading block %d\n", i);
  87                 if (dev_desc->block_read (dev_desc->dev, i, 1, (ulong *) tmpbuf) != 1)
  88                 return (-1);
  89                 if(ppr->desctype==0x00)
  90                         break; /* boot entry found */
  91                 if(ppr->desctype==0xff) {
  92                         if(verb)
  93                                 printf ("** No valid boot catalog found on %d:%d **\n",
  94                                         dev_desc->dev, part_num);
  95                         return (-1);
  96                 }
  97         }
  98         /* boot entry found */
  99         if(strncmp(pbr->ident_str,"EL TORITO SPECIFICATION",23)!=0) {
 100                 if(verb)
 101                         printf ("** Wrong El Torito ident: %s on %d:%d **\n",
 102                                 pbr->ident_str,dev_desc->dev, part_num);
 103                 return (-1);
 104         }
 105         bootaddr=le32_to_int(pbr->pointer);
 106         PRINTF(" Boot Entry at: %08lX\n",bootaddr);
 107         if (dev_desc->block_read (dev_desc->dev, bootaddr, 1, (ulong *) tmpbuf) != 1) {
 108                 if(verb)
 109                         printf ("** Can't read Boot Entry at %lX on %d:%d **\n",
 110                                 bootaddr,dev_desc->dev, part_num);
 111                 return (-1);
 112         }
 113         chksum=0;
 114         chksumbuf = (unsigned short *)tmpbuf;
 115         for(i=0;i<0x10;i++)
 116                 chksum+=((chksumbuf[i] &0xff)<<8)+((chksumbuf[i] &0xff00)>>8);
 117         if(chksum!=0) {
 118                 if(verb)
 119                         printf ("** Checksum Error in booting catalog validation entry on %d:%d **\n",
 120                                 dev_desc->dev, part_num);
 121                 return (-1);
 122         }
 123         if((pve->key[0]!=0x55)||(pve->key[1]!=0xAA)) {
 124                 if(verb)
 125                         printf ("** Key 0x55 0xAA error on %d:%d **\n",
 126                                 dev_desc->dev, part_num);
 127                 return(-1);
 128         }
 129 #ifdef CHECK_FOR_POWERPC_PLATTFORM
 130         if(pve->platform!=0x01) {
 131                 if(verb)
 132                         printf ("** No PowerPC platform CD on %d:%d **\n",
 133                                 dev_desc->dev, part_num);
 134                 return(-1);
 135         }
 136 #endif
 137         /* the validation entry seems to be ok, now search the "partition" */
 138         entry_num=0;
 139         offset=0x20;
 140         sprintf ((char *)info->type, "U-Boot");
 141         switch(dev_desc->if_type) {
 142                 case IF_TYPE_IDE:
 143                 case IF_TYPE_SATA:
 144                 case IF_TYPE_ATAPI:
 145                         sprintf ((char *)info->name, "hd%c%d",
 146                                 'a' + dev_desc->dev, part_num);
 147                         break;
 148                 case IF_TYPE_SCSI:
 149                         sprintf ((char *)info->name, "sd%c%d",
 150                                 'a' + dev_desc->dev, part_num);
 151                         break;
 152                 case IF_TYPE_USB:
 153                         sprintf ((char *)info->name, "usbd%c%d",
 154                                 'a' + dev_desc->dev, part_num);
 155                         break;
 156                 case IF_TYPE_DOC:
 157                         sprintf ((char *)info->name, "docd%c%d",
 158                                 'a' + dev_desc->dev, part_num);
 159                         break;
 160                 default:
 161                         sprintf ((char *)info->name, "xx%c%d",
 162                                 'a' + dev_desc->dev, part_num);
 163                         break;
 164         }
 165         /* the bootcatalog (including validation Entry) is limited to 2048Bytes
 166          * (63 boot entries + validation entry) */
 167          while(offset<2048) {
 168                 pide=(iso_init_def_entry_t *)&tmpbuf[offset];
 169                 if ((pide->boot_ind==0x88) ||
 170                     (pide->boot_ind==0x00)) { /* Header Id for default Sections Entries */
 171                         if(entry_num==part_num) { /* part found */
 172                                 goto found;
 173                         }
 174                         entry_num++; /* count partitions Entries (boot and non bootables */
 175                         offset+=0x20;
 176                         continue;
 177                 }
 178                 if ((pide->boot_ind==0x90) ||   /* Section Header Entry */
 179                     (pide->boot_ind==0x91) ||   /* Section Header Entry (last) */
 180                     (pide->boot_ind==0x44)) {   /* Extension Indicator */
 181                         offset+=0x20; /* skip unused entries */
 182                 }
 183                 else {
 184                         if(verb)
 185                                 printf ("** Partition %d not found on device %d **\n",
 186                                         part_num,dev_desc->dev);
 187                         return(-1);
 188                 }
 189         }
 190         /* if we reach this point entire sector has been
 191          * searched w/o succsess */
 192         if(verb)
 193                 printf ("** Partition %d not found on device %d **\n",
 194                         part_num,dev_desc->dev);
 195         return(-1);
 196 found:
 197         if(pide->boot_ind!=0x88) {
 198                 if(verb)
 199                         printf ("** Partition %d is not bootable on device %d **\n",
 200                                 part_num,dev_desc->dev);
 201                 return (-1);
 202         }
 203         switch(pide->boot_media) {
 204                 case 0x00: /* no emulation */
 205                         info->size=le16_to_int(pide->sec_cnt)>>2;
 206                         break;
 207                 case 0x01:      info->size=2400>>2; break; /* 1.2MByte Floppy */
 208                 case 0x02:      info->size=2880>>2; break; /* 1.44MByte Floppy */
 209                 case 0x03:      info->size=5760>>2; break; /* 2.88MByte Floppy */
 210                 case 0x04:      info->size=2880>>2; break; /* dummy (HD Emulation) */
 211                 default:        info->size=0; break;
 212         }
 213         newblkaddr=le32_to_int(pide->rel_block_addr);
 214         info->start=newblkaddr;
 215         PRINTF(" part %d found @ %lx size %lx\n",part_num,newblkaddr,info->size);
 216         return 0;
 217 }
 218
 219 int get_partition_info_iso(block_dev_desc_t * dev_desc, int part_num, disk_partition_t * info)
 220 {
 221         return(get_partition_info_iso_verb(dev_desc, part_num, info, 1));
 222 }
 223
 224
 225 void print_part_iso(block_dev_desc_t * dev_desc)
 226 {
 227         disk_partition_t info;
 228         int i;
 229         if(get_partition_info_iso_verb(dev_desc,0,&info,0)==-1) {
 230                 printf("** No boot partition found on device %d **\n",dev_desc->dev);
 231                 return;
 232         }
 233         printf("Part   Start     Sect x Size Type\n");
 234         i=0;
 235         do {
 236                 printf(" %2d " LBAFU " " LBAFU " %6ld %.32s\n",
 237                        i, info.start, info.size, info.blksz, info.type);
 238                 i++;
 239         } while (get_partition_info_iso_verb(dev_desc,i,&info,0)!=-1);
 240 }
 241
 242 int test_part_iso (block_dev_desc_t *dev_desc)
 243 {
 244         disk_partition_t info;
 245
 246         return(get_partition_info_iso_verb(dev_desc,0,&info,0));
 247 }
 248
 249 #endif