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 <asm/unaligned.h>
  11 #include "part_iso.h"
  12
  13 #ifdef HAVE_BLOCK_DEVICE
  14
  15 /* #define      ISO_PART_DEBUG */
  16
  17 #ifdef  ISO_PART_DEBUG
  18 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  19 #else
  20 #define PRINTF(fmt,args...)
  21 #endif
  22
  23 /* enable this if CDs are written with the PowerPC Platform ID */
  24 #undef CHECK_FOR_POWERPC_PLATTFORM
  25 #define CD_SECTSIZE 2048
  26
  27 static unsigned char tmpbuf[CD_SECTSIZE];
  28
  29 /* only boot records will be listed as valid partitions */
  30 int part_get_info_iso_verb(struct blk_desc *dev_desc, int part_num,
  31                            disk_partition_t *info, int verb)
  32 {
  33         int i,offset,entry_num;
  34         unsigned short *chksumbuf;
  35         unsigned short chksum;
  36         unsigned long newblkaddr,blkaddr,lastsect,bootaddr;
  37         iso_boot_rec_t *pbr = (iso_boot_rec_t   *)tmpbuf; /* boot record */
  38         iso_pri_rec_t *ppr = (iso_pri_rec_t     *)tmpbuf;       /* primary desc */
  39         iso_val_entry_t *pve = (iso_val_entry_t *)tmpbuf;
  40         iso_init_def_entry_t *pide;
  41
  42         if (dev_desc->blksz != CD_SECTSIZE)
  43                 return -1;
  44
  45         /* the first sector (sector 0x10) must be a primary volume desc */
  46         blkaddr=PVD_OFFSET;
  47         if (blk_dread(dev_desc, PVD_OFFSET, 1, (ulong *)tmpbuf) != 1)
  48                 return -1;
  49         if(ppr->desctype!=0x01) {
  50                 if(verb)
  51                         printf ("** First descriptor is NOT a primary desc on %d:%d **\n",
  52                                 dev_desc->devnum, part_num);
  53                 return (-1);
  54         }
  55         if(strncmp((char *)ppr->stand_ident,"CD001",5)!=0) {
  56                 if(verb)
  57                         printf ("** Wrong ISO Ident: %s on %d:%d **\n",
  58                                 ppr->stand_ident, dev_desc->devnum, part_num);
  59                 return (-1);
  60         }
  61         lastsect= ((ppr->firstsek_LEpathtab1_LE & 0x000000ff)<<24) +
  62                   ((ppr->firstsek_LEpathtab1_LE & 0x0000ff00)<< 8) +
  63                   ((ppr->firstsek_LEpathtab1_LE & 0x00ff0000)>> 8) +
  64                   ((ppr->firstsek_LEpathtab1_LE & 0xff000000)>>24) ;
  65         info->blksz=ppr->secsize_BE; /* assuming same block size for all entries */
  66         PRINTF(" Lastsect:%08lx\n",lastsect);
  67         for(i=blkaddr;i<lastsect;i++) {
  68                 PRINTF("Reading block %d\n", i);
  69                 if (blk_dread(dev_desc, i, 1, (ulong *)tmpbuf) != 1)
  70                         return -1;
  71                 if(ppr->desctype==0x00)
  72                         break; /* boot entry found */
  73                 if(ppr->desctype==0xff) {
  74                         if(verb)
  75                                 printf ("** No valid boot catalog found on %d:%d **\n",
  76                                         dev_desc->devnum, part_num);
  77                         return (-1);
  78                 }
  79         }
  80         /* boot entry found */
  81         if(strncmp(pbr->ident_str,"EL TORITO SPECIFICATION",23)!=0) {
  82                 if(verb)
  83                         printf ("** Wrong El Torito ident: %s on %d:%d **\n",
  84                                 pbr->ident_str, dev_desc->devnum, part_num);
  85                 return (-1);
  86         }
  87         bootaddr = get_unaligned_le32(pbr->pointer);
  88         PRINTF(" Boot Entry at: %08lX\n",bootaddr);
  89         if (blk_dread(dev_desc, bootaddr, 1, (ulong *)tmpbuf) != 1) {
  90                 if(verb)
  91                         printf ("** Can't read Boot Entry at %lX on %d:%d **\n",
  92                                 bootaddr, dev_desc->devnum, part_num);
  93                 return (-1);
  94         }
  95         chksum=0;
  96         chksumbuf = (unsigned short *)tmpbuf;
  97         for(i=0;i<0x10;i++)
  98                 chksum+=((chksumbuf[i] &0xff)<<8)+((chksumbuf[i] &0xff00)>>8);
  99         if(chksum!=0) {
 100                 if(verb)
 101                         printf("** Checksum Error in booting catalog validation entry on %d:%d **\n",
 102                                dev_desc->devnum, part_num);
 103                 return (-1);
 104         }
 105         if((pve->key[0]!=0x55)||(pve->key[1]!=0xAA)) {
 106                 if(verb)
 107                         printf ("** Key 0x55 0xAA error on %d:%d **\n",
 108                                 dev_desc->devnum, part_num);
 109                 return(-1);
 110         }
 111 #ifdef CHECK_FOR_POWERPC_PLATTFORM
 112         if(pve->platform!=0x01) {
 113                 if(verb)
 114                         printf ("** No PowerPC platform CD on %d:%d **\n",
 115                                 dev_desc->devnum, part_num);
 116                 return(-1);
 117         }
 118 #endif
 119         /* the validation entry seems to be ok, now search the "partition" */
 120         entry_num=0;
 121         offset=0x20;
 122         strcpy((char *)info->type, "U-Boot");
 123         switch(dev_desc->if_type) {
 124                 case IF_TYPE_IDE:
 125                 case IF_TYPE_SATA:
 126                 case IF_TYPE_ATAPI:
 127                         sprintf ((char *)info->name, "hd%c%d",
 128                                 'a' + dev_desc->devnum, part_num);
 129                         break;
 130                 case IF_TYPE_SCSI:
 131                         sprintf ((char *)info->name, "sd%c%d",
 132                                 'a' + dev_desc->devnum, part_num);
 133                         break;
 134                 case IF_TYPE_USB:
 135                         sprintf ((char *)info->name, "usbd%c%d",
 136                                 'a' + dev_desc->devnum, part_num);
 137                         break;
 138                 case IF_TYPE_DOC:
 139                         sprintf ((char *)info->name, "docd%c%d",
 140                                 'a' + dev_desc->devnum, part_num);
 141                         break;
 142                 default:
 143                         sprintf ((char *)info->name, "xx%c%d",
 144                                 'a' + dev_desc->devnum, part_num);
 145                         break;
 146         }
 147         /* the bootcatalog (including validation Entry) is limited to 2048Bytes
 148          * (63 boot entries + validation entry) */
 149          while(offset<2048) {
 150                 pide=(iso_init_def_entry_t *)&tmpbuf[offset];
 151                 if ((pide->boot_ind==0x88) ||
 152                     (pide->boot_ind==0x00)) { /* Header Id for default Sections Entries */
 153                         if(entry_num==part_num) { /* part found */
 154                                 goto found;
 155                         }
 156                         entry_num++; /* count partitions Entries (boot and non bootables */
 157                         offset+=0x20;
 158                         continue;
 159                 }
 160                 if ((pide->boot_ind==0x90) ||   /* Section Header Entry */
 161                     (pide->boot_ind==0x91) ||   /* Section Header Entry (last) */
 162                     (pide->boot_ind==0x44)) {   /* Extension Indicator */
 163                         offset+=0x20; /* skip unused entries */
 164                 }
 165                 else {
 166                         if(verb)
 167                                 printf ("** Partition %d not found on device %d **\n",
 168                                         part_num, dev_desc->devnum);
 169                         return(-1);
 170                 }
 171         }
 172         /* if we reach this point entire sector has been
 173          * searched w/o succsess */
 174         if(verb)
 175                 printf ("** Partition %d not found on device %d **\n",
 176                         part_num, dev_desc->devnum);
 177         return(-1);
 178 found:
 179         if(pide->boot_ind!=0x88) {
 180                 if(verb)
 181                         printf("** Partition %d is not bootable on device %d **\n",
 182                                part_num, dev_desc->devnum);
 183                 return (-1);
 184         }
 185         switch(pide->boot_media) {
 186                 case 0x00: /* no emulation */
 187                         info->size = get_unaligned_le16(pide->sec_cnt)>>2;
 188                         break;
 189                 case 0x01:      info->size=2400>>2; break; /* 1.2MByte Floppy */
 190                 case 0x02:      info->size=2880>>2; break; /* 1.44MByte Floppy */
 191                 case 0x03:      info->size=5760>>2; break; /* 2.88MByte Floppy */
 192                 case 0x04:      info->size=2880>>2; break; /* dummy (HD Emulation) */
 193                 default:        info->size=0; break;
 194         }
 195         newblkaddr = get_unaligned_le32(pide->rel_block_addr);
 196         info->start=newblkaddr;
 197         PRINTF(" part %d found @ %lx size %lx\n",part_num,newblkaddr,info->size);
 198         return 0;
 199 }
 200
 201 static int part_get_info_iso(struct blk_desc *dev_desc, int part_num,
 202                                   disk_partition_t *info)
 203 {
 204         return part_get_info_iso_verb(dev_desc, part_num, info, 1);
 205 }
 206
 207 static void part_print_iso(struct blk_desc *dev_desc)
 208 {
 209         disk_partition_t info;
 210         int i;
 211
 212         if (part_get_info_iso_verb(dev_desc, 0, &info, 0) == -1) {
 213                 printf("** No boot partition found on device %d **\n",
 214                        dev_desc->devnum);
 215                 return;
 216         }
 217         printf("Part   Start     Sect x Size Type\n");
 218         i=0;
 219         do {
 220                 printf(" %2d " LBAFU " " LBAFU " %6ld %.32s\n",
 221                        i, info.start, info.size, info.blksz, info.type);
 222                 i++;
 223         } while (part_get_info_iso_verb(dev_desc, i, &info, 0) != -1);
 224 }
 225
 226 static int part_test_iso(struct blk_desc *dev_desc)
 227 {
 228         disk_partition_t info;
 229
 230         return part_get_info_iso_verb(dev_desc, 0, &info, 0);
 231 }
 232
 233 U_BOOT_PART_TYPE(iso) = {
 234         .name           = "ISO",
 235         .part_type      = PART_TYPE_ISO,
 236         .get_info       = part_get_info_iso,
 237         .print          = part_print_iso,
 238         .test           = part_test_iso,
 239 };
 240 #endif