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1 /*
2  * (C) Copyright 2001
3  * Raymond Lo, lo@routefree.com
4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5  *
6  * SPDX-License-Identifier:     GPL-2.0+
7  */
8
9 /*
10  * Support for harddisk partitions.
11  *
12  * To be compatible with LinuxPPC and Apple we use the standard Apple
13  * SCSI disk partitioning scheme. For more information see:
14  * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
15  */
16
17 #include <common.h>
18 #include <command.h>
19 #include <ide.h>
20 #include "part_dos.h"
21
22 #ifdef HAVE_BLOCK_DEVICE
23
24 /* Convert char[4] in little endian format to the host format integer
25  */
26 static inline int le32_to_int(unsigned char *le32)
27 {
28     return ((le32[3] << 24) +
29             (le32[2] << 16) +
30             (le32[1] << 8) +
31              le32[0]
32            );
33 }
34
35 static inline int is_extended(int part_type)
36 {
37     return (part_type == 0x5 ||
38             part_type == 0xf ||
39             part_type == 0x85);
40 }
41
42 static inline int is_bootable(dos_partition_t *p)
43 {
44         return p->boot_ind == 0x80;
45 }
46
47 static void print_one_part(dos_partition_t *p, int ext_part_sector,
48                            int part_num, unsigned int disksig)
49 {
50         int lba_start = ext_part_sector + le32_to_int (p->start4);
51         int lba_size  = le32_to_int (p->size4);
52
53         printf("%3d\t%-10d\t%-10d\t%08x-%02x\t%02x%s%s\n",
54                 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
55                 (is_extended(p->sys_ind) ? " Extd" : ""),
56                 (is_bootable(p) ? " Boot" : ""));
57 }
58
59 static int test_block_type(unsigned char *buffer)
60 {
61         int slot;
62         struct dos_partition *p;
63
64         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
65             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
66                 return (-1);
67         } /* no DOS Signature at all */
68         p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
69         for (slot = 0; slot < 3; slot++) {
70                 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
71                         if (!slot &&
72                             (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
73                                      "FAT", 3) == 0 ||
74                              strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
75                                      "FAT32", 5) == 0)) {
76                                 return DOS_PBR; /* is PBR */
77                         } else {
78                                 return -1;
79                         }
80                 }
81         }
82         return DOS_MBR;     /* Is MBR */
83 }
84
85
86 int test_part_dos (block_dev_desc_t *dev_desc)
87 {
88         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
89
90         if (dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1)
91                 return -1;
92
93         if (test_block_type(buffer) != DOS_MBR)
94                 return -1;
95
96         return 0;
97 }
98
99 /*  Print a partition that is relative to its Extended partition table
100  */
101 static void print_partition_extended(block_dev_desc_t *dev_desc,
102                                      int ext_part_sector, int relative,
103                                      int part_num, unsigned int disksig)
104 {
105         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
106         dos_partition_t *pt;
107         int i;
108
109         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
110                 printf ("** Can't read partition table on %d:%d **\n",
111                         dev_desc->dev, ext_part_sector);
112                 return;
113         }
114         i=test_block_type(buffer);
115         if (i != DOS_MBR) {
116                 printf ("bad MBR sector signature 0x%02x%02x\n",
117                         buffer[DOS_PART_MAGIC_OFFSET],
118                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
119                 return;
120         }
121
122         if (!ext_part_sector)
123                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
124
125         /* Print all primary/logical partitions */
126         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
127         for (i = 0; i < 4; i++, pt++) {
128                 /*
129                  * fdisk does not show the extended partitions that
130                  * are not in the MBR
131                  */
132
133                 if ((pt->sys_ind != 0) &&
134                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
135                         print_one_part(pt, ext_part_sector, part_num, disksig);
136                 }
137
138                 /* Reverse engr the fdisk part# assignment rule! */
139                 if ((ext_part_sector == 0) ||
140                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
141                         part_num++;
142                 }
143         }
144
145         /* Follows the extended partitions */
146         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
147         for (i = 0; i < 4; i++, pt++) {
148                 if (is_extended (pt->sys_ind)) {
149                         int lba_start = le32_to_int (pt->start4) + relative;
150
151                         print_partition_extended(dev_desc, lba_start,
152                                 ext_part_sector == 0  ? lba_start : relative,
153                                 part_num, disksig);
154                 }
155         }
156
157         return;
158 }
159
160
161 /*  Print a partition that is relative to its Extended partition table
162  */
163 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
164                                  int relative, int part_num,
165                                  int which_part, disk_partition_t *info,
166                                  unsigned int disksig)
167 {
168         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
169         dos_partition_t *pt;
170         int i;
171
172         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
173                 printf ("** Can't read partition table on %d:%d **\n",
174                         dev_desc->dev, ext_part_sector);
175                 return -1;
176         }
177         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
178                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
179                 printf ("bad MBR sector signature 0x%02x%02x\n",
180                         buffer[DOS_PART_MAGIC_OFFSET],
181                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
182                 return -1;
183         }
184
185 #ifdef CONFIG_PARTITION_UUIDS
186         if (!ext_part_sector)
187                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
188 #endif
189
190         /* Print all primary/logical partitions */
191         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
192         for (i = 0; i < 4; i++, pt++) {
193                 /*
194                  * fdisk does not show the extended partitions that
195                  * are not in the MBR
196                  */
197                 if (((pt->boot_ind & ~0x80) == 0) &&
198                     (pt->sys_ind != 0) &&
199                     (part_num == which_part) &&
200                     (is_extended(pt->sys_ind) == 0)) {
201                         info->blksz = 512;
202                         info->start = ext_part_sector + le32_to_int (pt->start4);
203                         info->size  = le32_to_int (pt->size4);
204                         switch(dev_desc->if_type) {
205                                 case IF_TYPE_IDE:
206                                 case IF_TYPE_SATA:
207                                 case IF_TYPE_ATAPI:
208                                         sprintf ((char *)info->name, "hd%c%d",
209                                                 'a' + dev_desc->dev, part_num);
210                                         break;
211                                 case IF_TYPE_SCSI:
212                                         sprintf ((char *)info->name, "sd%c%d",
213                                                 'a' + dev_desc->dev, part_num);
214                                         break;
215                                 case IF_TYPE_USB:
216                                         sprintf ((char *)info->name, "usbd%c%d",
217                                                 'a' + dev_desc->dev, part_num);
218                                         break;
219                                 case IF_TYPE_DOC:
220                                         sprintf ((char *)info->name, "docd%c%d",
221                                                 'a' + dev_desc->dev, part_num);
222                                         break;
223                                 default:
224                                         sprintf ((char *)info->name, "xx%c%d",
225                                                 'a' + dev_desc->dev, part_num);
226                                         break;
227                         }
228                         /* sprintf(info->type, "%d, pt->sys_ind); */
229                         sprintf ((char *)info->type, "U-Boot");
230                         info->bootable = is_bootable(pt);
231 #ifdef CONFIG_PARTITION_UUIDS
232                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
233 #endif
234                         return 0;
235                 }
236
237                 /* Reverse engr the fdisk part# assignment rule! */
238                 if ((ext_part_sector == 0) ||
239                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
240                         part_num++;
241                 }
242         }
243
244         /* Follows the extended partitions */
245         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
246         for (i = 0; i < 4; i++, pt++) {
247                 if (is_extended (pt->sys_ind)) {
248                         int lba_start = le32_to_int (pt->start4) + relative;
249
250                         return get_partition_info_extended (dev_desc, lba_start,
251                                  ext_part_sector == 0 ? lba_start : relative,
252                                  part_num, which_part, info, disksig);
253                 }
254         }
255         return -1;
256 }
257
258 void print_part_dos (block_dev_desc_t *dev_desc)
259 {
260         printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
261         print_partition_extended(dev_desc, 0, 0, 1, 0);
262 }
263
264 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
265 {
266         return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
267 }
268
269
270 #endif