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 <command.h>
   9 #include <asm/unaligned.h>
  10 #include "part_iso.h"
  11
  12 #ifdef CONFIG_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] __aligned(ARCH_DMA_MINALIGN);
  27
  28 unsigned long iso_dread(struct blk_desc *block_dev, lbaint_t start,
  29                         lbaint_t blkcnt, void *buffer)
  30 {
  31         unsigned long ret;
  32
  33         if (block_dev->blksz == 512) {
  34                 /* Convert from 2048 to 512 sector size */
  35                 start *= 4;
  36                 blkcnt *= 4;
  37         }
  38
  39         ret = blk_dread(block_dev, start, blkcnt, buffer);
  40
  41         if (block_dev->blksz == 512)
  42                 ret /= 4;
  43
  44         return ret;
  45 }
  46
  47 /* only boot records will be listed as valid partitions */
  48 int part_get_info_iso_verb(struct blk_desc *dev_desc, int part_num,
  49                            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) && (dev_desc->blksz != 512))
  61                 return -1;
  62
  63         /* the first sector (sector 0x10) must be a primary volume desc */
  64         blkaddr=PVD_OFFSET;
  65         if (iso_dread(dev_desc, 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->devnum, 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->devnum, part_num);
  77                 return (-1);
  78         }
  79         lastsect = le32_to_cpu(ppr->firstsek_LEpathtab1_LE);
  80         /* assuming same block size for all entries */
  81         info->blksz = be16_to_cpu(ppr->secsize_BE);
  82         PRINTF(" Lastsect:%08lx\n",lastsect);
  83         for(i=blkaddr;i<lastsect;i++) {
  84                 PRINTF("Reading block %d\n", i);
  85                 if (iso_dread(dev_desc, i, 1, (ulong *)tmpbuf) != 1)
  86                         return -1;
  87                 if(ppr->desctype==0x00)
  88                         break; /* boot entry found */
  89                 if(ppr->desctype==0xff) {
  90                         if(verb)
  91                                 printf ("** No valid boot catalog found on %d:%d **\n",
  92                                         dev_desc->devnum, part_num);
  93                         return (-1);
  94                 }
  95         }
  96         /* boot entry found */
  97         if(strncmp(pbr->ident_str,"EL TORITO SPECIFICATION",23)!=0) {
  98                 if(verb)
  99                         printf ("** Wrong El Torito ident: %s on %d:%d **\n",
 100                                 pbr->ident_str, dev_desc->devnum, part_num);
 101                 return (-1);
 102         }
 103         bootaddr = get_unaligned_le32(pbr->pointer);
 104         PRINTF(" Boot Entry at: %08lX\n",bootaddr);
 105         if (iso_dread(dev_desc, bootaddr, 1, (ulong *)tmpbuf) != 1) {
 106                 if(verb)
 107                         printf ("** Can't read Boot Entry at %lX on %d:%d **\n",
 108                                 bootaddr, dev_desc->devnum, part_num);
 109                 return (-1);
 110         }
 111         chksum=0;
 112         chksumbuf = (unsigned short *)tmpbuf;
 113         for(i=0;i<0x10;i++)
 114                 chksum += le16_to_cpu(chksumbuf[i]);
 115         if(chksum!=0) {
 116                 if(verb)
 117                         printf("** Checksum Error in booting catalog validation entry on %d:%d **\n",
 118                                dev_desc->devnum, part_num);
 119                 return (-1);
 120         }
 121         if((pve->key[0]!=0x55)||(pve->key[1]!=0xAA)) {
 122                 if(verb)
 123                         printf ("** Key 0x55 0xAA error on %d:%d **\n",
 124                                 dev_desc->devnum, part_num);
 125                 return(-1);
 126         }
 127 #ifdef CHECK_FOR_POWERPC_PLATTFORM
 128         if(pve->platform!=0x01) {
 129                 if(verb)
 130                         printf ("** No PowerPC platform CD on %d:%d **\n",
 131                                 dev_desc->devnum, part_num);
 132                 return(-1);
 133         }
 134 #endif
 135         /* the validation entry seems to be ok, now search the "partition" */
 136         entry_num=1;
 137         offset=0x20;
 138         strcpy((char *)info->type, "U-Boot");
 139         part_set_generic_name(dev_desc, part_num, (char *)info->name);
 140         /* the bootcatalog (including validation Entry) is limited to 2048Bytes
 141          * (63 boot entries + validation entry) */
 142          while(offset<2048) {
 143                 pide=(iso_init_def_entry_t *)&tmpbuf[offset];
 144                 if ((pide->boot_ind==0x88) ||
 145                     (pide->boot_ind==0x00)) { /* Header Id for default Sections Entries */
 146                         if(entry_num==part_num) { /* part found */
 147                                 goto found;
 148                         }
 149                         entry_num++; /* count partitions Entries (boot and non bootables */
 150                         offset+=0x20;
 151                         continue;
 152                 }
 153                 if ((pide->boot_ind==0x90) ||   /* Section Header Entry */
 154                     (pide->boot_ind==0x91) ||   /* Section Header Entry (last) */
 155                     (pide->boot_ind==0x44)) {   /* Extension Indicator */
 156                         offset+=0x20; /* skip unused entries */
 157                 }
 158                 else {
 159                         if(verb)
 160                                 printf ("** Partition %d not found on device %d **\n",
 161                                         part_num, dev_desc->devnum);
 162                         return(-1);
 163                 }
 164         }
 165         /* if we reach this point entire sector has been
 166          * searched w/o succsess */
 167         if(verb)
 168                 printf ("** Partition %d not found on device %d **\n",
 169                         part_num, dev_desc->devnum);
 170         return(-1);
 171 found:
 172         if(pide->boot_ind!=0x88) {
 173                 if(verb)
 174                         printf("** Partition %d is not bootable on device %d **\n",
 175                                part_num, dev_desc->devnum);
 176                 return (-1);
 177         }
 178         switch(pide->boot_media) {
 179                 case 0x00: /* no emulation */
 180                         info->size = get_unaligned_le16(pide->sec_cnt)>>2;
 181                         break;
 182                 case 0x01:      info->size=2400>>2; break; /* 1.2MByte Floppy */
 183                 case 0x02:      info->size=2880>>2; break; /* 1.44MByte Floppy */
 184                 case 0x03:      info->size=5760>>2; break; /* 2.88MByte Floppy */
 185                 case 0x04:      info->size=2880>>2; break; /* dummy (HD Emulation) */
 186                 default:        info->size=0; break;
 187         }
 188         newblkaddr = get_unaligned_le32(pide->rel_block_addr);
 189         info->start=newblkaddr;
 190
 191         if (dev_desc->blksz == 512) {
 192                 info->size *= 4;
 193                 info->start *= 4;
 194                 info->blksz = 512;
 195         }
 196
 197         PRINTF(" part %d found @ %lx size %lx\n",part_num,info->start,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, 0);
 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, 1, &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=1;
 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, 1, &info, 0);
 231 }
 232
 233 U_BOOT_PART_TYPE(iso) = {
 234         .name           = "ISO",
 235         .part_type      = PART_TYPE_ISO,
 236         .max_entries    = ISO_ENTRY_NUMBERS,
 237         .get_info       = part_get_info_iso,
 238         .print          = part_print_iso,
 239         .test           = part_test_iso,
 240 };
 241 #endif