disk/part_mac.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 /*
   8  * Support for harddisk partitions.
   9  *
  10  * To be compatible with LinuxPPC and Apple we use the standard Apple
  11  * SCSI disk partitioning scheme. For more information see:
  12  * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
  13  */
  14
  15 #include <common.h>
  16 #include <command.h>
  17 #include <log.h>
  18 #include <memalign.h>
  19 #include <ide.h>
  20 #include "part_mac.h"
  21 #include <part.h>
  22
  23 /* stdlib.h causes some compatibility problems; should fixe these! -- wd */
  24 #ifndef __ldiv_t_defined
  25 typedef struct {
  26         long int quot;          /* Quotient     */
  27         long int rem;           /* Remainder    */
  28 } ldiv_t;
  29 extern ldiv_t ldiv (long int __numer, long int __denom);
  30 # define __ldiv_t_defined       1
  31 #endif
  32
  33
  34 static int part_mac_read_ddb(struct blk_desc *desc, mac_driver_desc_t *ddb_p);
  35 static int part_mac_read_pdb(struct blk_desc *desc, int part,
  36                              mac_partition_t *pdb_p);
  37
  38 /*
  39  * Test for a valid MAC partition
  40  */
  41 static int part_test_mac(struct blk_desc *desc)
  42 {
  43         ALLOC_CACHE_ALIGN_BUFFER(mac_driver_desc_t, ddesc, 1);
  44         ALLOC_CACHE_ALIGN_BUFFER(mac_partition_t, mpart, 1);
  45         ulong i, n;
  46
  47         if (part_mac_read_ddb(desc, ddesc)) {
  48                 /*
  49                  * error reading Driver Descriptor Block,
  50                  * or no valid Signature
  51                  */
  52                 return (-1);
  53         }
  54
  55         n = 1;  /* assuming at least one partition */
  56         for (i=1; i<=n; ++i) {
  57                 if ((blk_dread(desc, i, 1, (ulong *)mpart) != 1) ||
  58                     mpart->signature != MAC_PARTITION_MAGIC) {
  59                         return (-1);
  60                 }
  61                 /* update partition count */
  62                 n = mpart->map_count;
  63         }
  64         return (0);
  65 }
  66
  67 static void part_print_mac(struct blk_desc *desc)
  68 {
  69         ulong i, n;
  70         ALLOC_CACHE_ALIGN_BUFFER(mac_driver_desc_t, ddesc, 1);
  71         ALLOC_CACHE_ALIGN_BUFFER(mac_partition_t, mpart, 1);
  72         ldiv_t mb, gb;
  73
  74         if (part_mac_read_ddb(desc, ddesc)) {
  75                 /*
  76                  * error reading Driver Descriptor Block,
  77                  * or no valid Signature
  78                  */
  79                 return;
  80         }
  81
  82         n  = ddesc->blk_count;
  83
  84         mb = ldiv(n, ((1024 * 1024) / ddesc->blk_size)); /* MB */
  85         /* round to 1 digit */
  86         mb.rem *= 10 * ddesc->blk_size;
  87         mb.rem += 512 * 1024;
  88         mb.rem /= 1024 * 1024;
  89
  90         gb = ldiv(10 * mb.quot + mb.rem, 10240);
  91         gb.rem += 512;
  92         gb.rem /= 1024;
  93
  94
  95         printf ("Block Size=%d, Number of Blocks=%d, "
  96                 "Total Capacity: %ld.%ld MB = %ld.%ld GB\n"
  97                 "DeviceType=0x%x, DeviceId=0x%x\n\n"
  98                 "   #:                 type name"
  99                 "                   length   base       (size)\n",
 100                 ddesc->blk_size,
 101                 ddesc->blk_count,
 102                 mb.quot, mb.rem, gb.quot, gb.rem,
 103                 ddesc->dev_type, ddesc->dev_id
 104                 );
 105
 106         n = 1;  /* assuming at least one partition */
 107         for (i=1; i<=n; ++i) {
 108                 ulong bytes;
 109                 char c;
 110
 111                 printf ("%4ld: ", i);
 112                 if (blk_dread(desc, i, 1, (ulong *)mpart) != 1) {
 113                         printf ("** Can't read Partition Map on %d:%ld **\n",
 114                                 desc->devnum, i);
 115                         return;
 116                 }
 117
 118                 if (mpart->signature != MAC_PARTITION_MAGIC) {
 119                         printf("** Bad Signature on %d:%ld - expected 0x%04x, got 0x%04x\n",
 120                                desc->devnum, i, MAC_PARTITION_MAGIC,
 121                                mpart->signature);
 122                         return;
 123                 }
 124
 125                 /* update partition count */
 126                 n = mpart->map_count;
 127
 128                 c      = 'k';
 129                 bytes  = mpart->block_count;
 130                 bytes /= (1024 / ddesc->blk_size);  /* kB; assumes blk_size == 512 */
 131                 if (bytes >= 1024) {
 132                         bytes >>= 10;
 133                         c = 'M';
 134                 }
 135                 if (bytes >= 1024) {
 136                         bytes >>= 10;
 137                         c = 'G';
 138                 }
 139
 140                 printf ("%20.32s %-18.32s %10u @ %-10u (%3ld%c)\n",
 141                         mpart->type,
 142                         mpart->name,
 143                         mpart->block_count,
 144                         mpart->start_block,
 145                         bytes, c
 146                         );
 147         }
 148
 149         return;
 150 }
 151
 152
 153 /*
 154  * Read Device Descriptor Block
 155  */
 156 static int part_mac_read_ddb(struct blk_desc *desc, mac_driver_desc_t *ddb_p)
 157 {
 158         if (blk_dread(desc, 0, 1, (ulong *)ddb_p) != 1) {
 159                 debug("** Can't read Driver Descriptor Block **\n");
 160                 return (-1);
 161         }
 162
 163         if (ddb_p->signature != MAC_DRIVER_MAGIC) {
 164                 return (-1);
 165         }
 166         return (0);
 167 }
 168
 169 /*
 170  * Read Partition Descriptor Block
 171  */
 172 static int part_mac_read_pdb(struct blk_desc *desc, int part,
 173                              mac_partition_t *pdb_p)
 174 {
 175         int n = 1;
 176
 177         for (;;) {
 178                 /*
 179                  * We must always read the descritpor block for
 180                  * partition 1 first since this is the only way to
 181                  * know how many partitions we have.
 182                  */
 183                 if (blk_dread(desc, n, 1, (ulong *)pdb_p) != 1) {
 184                         printf("** Can't read Partition Map on %d:%d **\n",
 185                                desc->devnum, n);
 186                         return (-1);
 187                 }
 188
 189                 if (pdb_p->signature != MAC_PARTITION_MAGIC) {
 190                         printf("** Bad Signature on %d:%d: expected 0x%04x, got 0x%04x\n",
 191                                desc->devnum, n, MAC_PARTITION_MAGIC,
 192                                pdb_p->signature);
 193                         return (-1);
 194                 }
 195
 196                 if (n == part)
 197                         return (0);
 198
 199                 if ((part < 1) || (part > pdb_p->map_count)) {
 200                         printf("** Invalid partition %d:%d [%d:1...%d:%d only]\n",
 201                                desc->devnum, part, desc->devnum, desc->devnum,
 202                                pdb_p->map_count);
 203                         return (-1);
 204                 }
 205
 206                 /* update partition count */
 207                 n = part;
 208         }
 209
 210         /* NOTREACHED */
 211 }
 212
 213 static int part_get_info_mac(struct blk_desc *desc, int part,
 214                              struct disk_partition *info)
 215 {
 216         ALLOC_CACHE_ALIGN_BUFFER(mac_driver_desc_t, ddesc, 1);
 217         ALLOC_CACHE_ALIGN_BUFFER(mac_partition_t, mpart, 1);
 218
 219         if (part_mac_read_ddb(desc, ddesc))
 220                 return -1;
 221
 222         info->blksz = ddesc->blk_size;
 223
 224         if (part_mac_read_pdb(desc, part, mpart))
 225                 return -1;
 226
 227         info->start = mpart->start_block;
 228         info->size  = mpart->block_count;
 229         memcpy (info->type, mpart->type, sizeof(info->type));
 230         memcpy (info->name, mpart->name, sizeof(info->name));
 231
 232         return (0);
 233 }
 234
 235 U_BOOT_PART_TYPE(mac) = {
 236         .name           = "MAC",
 237         .part_type      = PART_TYPE_MAC,
 238         .max_entries    = MAC_ENTRY_NUMBERS,
 239         .get_info       = part_get_info_mac,
 240         .print          = part_print_mac,
 241         .test           = part_test_mac,
 242 };