disk/part_iso.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001
   4  * Denis Peter, MPL AG Switzerland, d.peter@mpl.ch.
   5  */
   6
   7 #include <common.h>
   8 #include <blk.h>
   9 #include <command.h>
  10 #include <part.h>
  11 #include <asm/cache.h>
  12 #include <asm/unaligned.h>
  13 #include "part_iso.h"
  14
  15 #ifdef CONFIG_HAVE_BLOCK_DEVICE
  16
  17 /* #define      ISO_PART_DEBUG */
  18
  19 #ifdef  ISO_PART_DEBUG
  20 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  21 #else
  22 #define PRINTF(fmt,args...)
  23 #endif
  24
  25 /* enable this if CDs are written with the PowerPC Platform ID */
  26 #undef CHECK_FOR_POWERPC_PLATTFORM
  27 #define CD_SECTSIZE 2048
  28
  29 static unsigned char tmpbuf[CD_SECTSIZE] __aligned(ARCH_DMA_MINALIGN);
  30
  31 unsigned long iso_dread(struct blk_desc *block_dev, lbaint_t start,
  32                         lbaint_t blkcnt, void *buffer)
  33 {
  34         unsigned long ret;
  35
  36         if (block_dev->blksz == 512) {
  37                 /* Convert from 2048 to 512 sector size */
  38                 start *= 4;
  39                 blkcnt *= 4;
  40         }
  41
  42         ret = blk_dread(block_dev, start, blkcnt, buffer);
  43
  44         if (block_dev->blksz == 512)
  45                 ret /= 4;
  46
  47         return ret;
  48 }
  49
  50 /* only boot records will be listed as valid partitions */
  51 int part_get_info_iso_verb(struct blk_desc *dev_desc, int part_num,
  52                            struct disk_partition *info, int verb)
  53 {
  54         int i,offset,entry_num;
  55         unsigned short *chksumbuf;
  56         unsigned short chksum;
  57         unsigned long newblkaddr,blkaddr,lastsect,bootaddr;
  58         iso_boot_rec_t *pbr = (iso_boot_rec_t   *)tmpbuf; /* boot record */
  59         iso_pri_rec_t *ppr = (iso_pri_rec_t     *)tmpbuf;       /* primary desc */
  60         iso_val_entry_t *pve = (iso_val_entry_t *)tmpbuf;
  61         iso_init_def_entry_t *pide;
  62
  63         if ((dev_desc->blksz != CD_SECTSIZE) && (dev_desc->blksz != 512))
  64                 return -1;
  65
  66         /* the first sector (sector 0x10) must be a primary volume desc */
  67         blkaddr=PVD_OFFSET;
  68         if (iso_dread(dev_desc, PVD_OFFSET, 1, (ulong *)tmpbuf) != 1)
  69                 return -1;
  70         if(ppr->desctype!=0x01) {
  71                 if(verb)
  72                         printf ("** First descriptor is NOT a primary desc on %d:%d **\n",
  73                                 dev_desc->devnum, part_num);
  74                 return (-1);
  75         }
  76         if(strncmp((char *)ppr->stand_ident,"CD001",5)!=0) {
  77                 if(verb)
  78                         printf ("** Wrong ISO Ident: %s on %d:%d **\n",
  79                                 ppr->stand_ident, dev_desc->devnum, part_num);
  80                 return (-1);
  81         }
  82         lastsect = le32_to_cpu(ppr->firstsek_LEpathtab1_LE);
  83         /* assuming same block size for all entries */
  84         info->blksz = be16_to_cpu(ppr->secsize_BE);
  85         PRINTF(" Lastsect:%08lx\n",lastsect);
  86         for(i=blkaddr;i<lastsect;i++) {
  87                 PRINTF("Reading block %d\n", i);
  88                 if (iso_dread(dev_desc, i, 1, (ulong *)tmpbuf) != 1)
  89                         return -1;
  90                 if(ppr->desctype==0x00)
  91                         break; /* boot entry found */
  92                 if(ppr->desctype==0xff) {
  93                         if(verb)
  94                                 printf ("** No valid boot catalog found on %d:%d **\n",
  95                                         dev_desc->devnum, part_num);
  96                         return (-1);
  97                 }
  98         }
  99         /* boot entry found */
 100         if(strncmp(pbr->ident_str,"EL TORITO SPECIFICATION",23)!=0) {
 101                 if(verb)
 102                         printf ("** Wrong El Torito ident: %s on %d:%d **\n",
 103                                 pbr->ident_str, dev_desc->devnum, part_num);
 104                 return (-1);
 105         }
 106         bootaddr = get_unaligned_le32(pbr->pointer);
 107         PRINTF(" Boot Entry at: %08lX\n",bootaddr);
 108         if (iso_dread(dev_desc, bootaddr, 1, (ulong *)tmpbuf) != 1) {
 109                 if(verb)
 110                         printf ("** Can't read Boot Entry at %lX on %d:%d **\n",
 111                                 bootaddr, dev_desc->devnum, part_num);
 112                 return (-1);
 113         }
 114         chksum=0;
 115         chksumbuf = (unsigned short *)tmpbuf;
 116         for(i=0;i<0x10;i++)
 117                 chksum += le16_to_cpu(chksumbuf[i]);
 118         if(chksum!=0) {
 119                 if(verb)
 120                         printf("** Checksum Error in booting catalog validation entry on %d:%d **\n",
 121                                dev_desc->devnum, part_num);
 122                 return (-1);
 123         }
 124         if((pve->key[0]!=0x55)||(pve->key[1]!=0xAA)) {
 125                 if(verb)
 126                         printf ("** Key 0x55 0xAA error on %d:%d **\n",
 127                                 dev_desc->devnum, part_num);
 128                 return(-1);
 129         }
 130 #ifdef CHECK_FOR_POWERPC_PLATTFORM
 131         if(pve->platform!=0x01) {
 132                 if(verb)
 133                         printf ("** No PowerPC platform CD on %d:%d **\n",
 134                                 dev_desc->devnum, part_num);
 135                 return(-1);
 136         }
 137 #endif
 138         /* the validation entry seems to be ok, now search the "partition" */
 139         entry_num=1;
 140         offset=0x20;
 141         strcpy((char *)info->type, "U-Boot");
 142         part_set_generic_name(dev_desc, part_num, (char *)info->name);
 143         /* the bootcatalog (including validation Entry) is limited to 2048Bytes
 144          * (63 boot entries + validation entry) */
 145          while(offset<2048) {
 146                 pide=(iso_init_def_entry_t *)&tmpbuf[offset];
 147                 if ((pide->boot_ind==0x88) ||
 148                     (pide->boot_ind==0x00)) { /* Header Id for default Sections Entries */
 149                         if(entry_num==part_num) { /* part found */
 150                                 goto found;
 151                         }
 152                         entry_num++; /* count partitions Entries (boot and non bootables */
 153                         offset+=0x20;
 154                         continue;
 155                 }
 156                 if ((pide->boot_ind==0x90) ||   /* Section Header Entry */
 157                     (pide->boot_ind==0x91) ||   /* Section Header Entry (last) */
 158                     (pide->boot_ind==0x44)) {   /* Extension Indicator */
 159                         offset+=0x20; /* skip unused entries */
 160                 }
 161                 else {
 162                         if(verb)
 163                                 printf ("** Partition %d not found on device %d **\n",
 164                                         part_num, dev_desc->devnum);
 165                         return(-1);
 166                 }
 167         }
 168         /* if we reach this point entire sector has been
 169          * searched w/o succsess */
 170         if(verb)
 171                 printf ("** Partition %d not found on device %d **\n",
 172                         part_num, dev_desc->devnum);
 173         return(-1);
 174 found:
 175         if(pide->boot_ind!=0x88) {
 176                 if(verb)
 177                         printf("** Partition %d is not bootable on device %d **\n",
 178                                part_num, dev_desc->devnum);
 179                 return (-1);
 180         }
 181         switch(pide->boot_media) {
 182                 case 0x00: /* no emulation */
 183                         info->size = get_unaligned_le16(pide->sec_cnt)>>2;
 184                         break;
 185                 case 0x01:      info->size=2400>>2; break; /* 1.2MByte Floppy */
 186                 case 0x02:      info->size=2880>>2; break; /* 1.44MByte Floppy */
 187                 case 0x03:      info->size=5760>>2; break; /* 2.88MByte Floppy */
 188                 case 0x04:      info->size=2880>>2; break; /* dummy (HD Emulation) */
 189                 default:        info->size=0; break;
 190         }
 191         newblkaddr = get_unaligned_le32(pide->rel_block_addr);
 192         info->start=newblkaddr;
 193
 194         if (dev_desc->blksz == 512) {
 195                 info->size *= 4;
 196                 info->start *= 4;
 197                 info->blksz = 512;
 198         }
 199
 200         PRINTF(" part %d found @ %lx size %lx\n",part_num,info->start,info->size);
 201         return 0;
 202 }
 203
 204 static int part_get_info_iso(struct blk_desc *dev_desc, int part_num,
 205                              struct disk_partition *info)
 206 {
 207         return part_get_info_iso_verb(dev_desc, part_num, info, 0);
 208 }
 209
 210 static void part_print_iso(struct blk_desc *dev_desc)
 211 {
 212         struct disk_partition info;
 213         int i;
 214
 215         if (part_get_info_iso_verb(dev_desc, 1, &info, 0) == -1) {
 216                 printf("** No boot partition found on device %d **\n",
 217                        dev_desc->devnum);
 218                 return;
 219         }
 220         printf("Part   Start     Sect x Size Type\n");
 221         i=1;
 222         do {
 223                 printf(" %2d " LBAFU " " LBAFU " %6ld %.32s\n",
 224                        i, info.start, info.size, info.blksz, info.type);
 225                 i++;
 226         } while (part_get_info_iso_verb(dev_desc, i, &info, 0) != -1);
 227 }
 228
 229 static int part_test_iso(struct blk_desc *dev_desc)
 230 {
 231         struct disk_partition info;
 232
 233         return part_get_info_iso_verb(dev_desc, 1, &info, 0);
 234 }
 235
 236 U_BOOT_PART_TYPE(iso) = {
 237         .name           = "ISO",
 238         .part_type      = PART_TYPE_ISO,
 239         .max_entries    = ISO_ENTRY_NUMBERS,
 240         .get_info       = part_get_info_iso,
 241         .print          = part_print_iso,
 242         .test           = part_test_iso,
 243 };
 244 #endif