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[u-boot] / disk / part_dos.c
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 #define DOS_PART_DEFAULT_SECTOR 512
25
26 /* Convert char[4] in little endian format to the host format integer
27  */
28 static inline int le32_to_int(unsigned char *le32)
29 {
30     return ((le32[3] << 24) +
31             (le32[2] << 16) +
32             (le32[1] << 8) +
33              le32[0]
34            );
35 }
36
37 static inline int is_extended(int part_type)
38 {
39     return (part_type == 0x5 ||
40             part_type == 0xf ||
41             part_type == 0x85);
42 }
43
44 static inline int is_bootable(dos_partition_t *p)
45 {
46         return p->boot_ind == 0x80;
47 }
48
49 static void print_one_part(dos_partition_t *p, int ext_part_sector,
50                            int part_num, unsigned int disksig)
51 {
52         int lba_start = ext_part_sector + le32_to_int (p->start4);
53         int lba_size  = le32_to_int (p->size4);
54
55         printf("%3d\t%-10d\t%-10d\t%08x-%02x\t%02x%s%s\n",
56                 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
57                 (is_extended(p->sys_ind) ? " Extd" : ""),
58                 (is_bootable(p) ? " Boot" : ""));
59 }
60
61 static int test_block_type(unsigned char *buffer)
62 {
63         int slot;
64         struct dos_partition *p;
65
66         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
67             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
68                 return (-1);
69         } /* no DOS Signature at all */
70         p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
71         for (slot = 0; slot < 3; slot++) {
72                 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
73                         if (!slot &&
74                             (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
75                                      "FAT", 3) == 0 ||
76                              strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
77                                      "FAT32", 5) == 0)) {
78                                 return DOS_PBR; /* is PBR */
79                         } else {
80                                 return -1;
81                         }
82                 }
83         }
84         return DOS_MBR;     /* Is MBR */
85 }
86
87
88 int test_part_dos (block_dev_desc_t *dev_desc)
89 {
90         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
91
92         if (dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1)
93                 return -1;
94
95         if (test_block_type(buffer) != DOS_MBR)
96                 return -1;
97
98         return 0;
99 }
100
101 /*  Print a partition that is relative to its Extended partition table
102  */
103 static void print_partition_extended(block_dev_desc_t *dev_desc,
104                                      int ext_part_sector, int relative,
105                                      int part_num, unsigned int disksig)
106 {
107         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
108         dos_partition_t *pt;
109         int i;
110
111         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
112                 printf ("** Can't read partition table on %d:%d **\n",
113                         dev_desc->dev, ext_part_sector);
114                 return;
115         }
116         i=test_block_type(buffer);
117         if (i != DOS_MBR) {
118                 printf ("bad MBR sector signature 0x%02x%02x\n",
119                         buffer[DOS_PART_MAGIC_OFFSET],
120                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
121                 return;
122         }
123
124         if (!ext_part_sector)
125                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
126
127         /* Print all primary/logical partitions */
128         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
129         for (i = 0; i < 4; i++, pt++) {
130                 /*
131                  * fdisk does not show the extended partitions that
132                  * are not in the MBR
133                  */
134
135                 if ((pt->sys_ind != 0) &&
136                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
137                         print_one_part(pt, ext_part_sector, part_num, disksig);
138                 }
139
140                 /* Reverse engr the fdisk part# assignment rule! */
141                 if ((ext_part_sector == 0) ||
142                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
143                         part_num++;
144                 }
145         }
146
147         /* Follows the extended partitions */
148         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
149         for (i = 0; i < 4; i++, pt++) {
150                 if (is_extended (pt->sys_ind)) {
151                         int lba_start = le32_to_int (pt->start4) + relative;
152
153                         print_partition_extended(dev_desc, lba_start,
154                                 ext_part_sector == 0  ? lba_start : relative,
155                                 part_num, disksig);
156                 }
157         }
158
159         return;
160 }
161
162
163 /*  Print a partition that is relative to its Extended partition table
164  */
165 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
166                                  int relative, int part_num,
167                                  int which_part, disk_partition_t *info,
168                                  unsigned int disksig)
169 {
170         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
171         dos_partition_t *pt;
172         int i;
173         int dos_type;
174
175         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
176                 printf ("** Can't read partition table on %d:%d **\n",
177                         dev_desc->dev, ext_part_sector);
178                 return -1;
179         }
180         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
181                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
182                 printf ("bad MBR sector signature 0x%02x%02x\n",
183                         buffer[DOS_PART_MAGIC_OFFSET],
184                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
185                 return -1;
186         }
187
188 #ifdef CONFIG_PARTITION_UUIDS
189         if (!ext_part_sector)
190                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
191 #endif
192
193         /* Print all primary/logical partitions */
194         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
195         for (i = 0; i < 4; i++, pt++) {
196                 /*
197                  * fdisk does not show the extended partitions that
198                  * are not in the MBR
199                  */
200                 if (((pt->boot_ind & ~0x80) == 0) &&
201                     (pt->sys_ind != 0) &&
202                     (part_num == which_part) &&
203                     (is_extended(pt->sys_ind) == 0)) {
204                         info->blksz = DOS_PART_DEFAULT_SECTOR;
205                         info->start = (lbaint_t)(ext_part_sector +
206                                         le32_to_int(pt->start4));
207                         info->size  = (lbaint_t)le32_to_int(pt->size4);
208                         switch(dev_desc->if_type) {
209                                 case IF_TYPE_IDE:
210                                 case IF_TYPE_SATA:
211                                 case IF_TYPE_ATAPI:
212                                         sprintf ((char *)info->name, "hd%c%d",
213                                                 'a' + dev_desc->dev, part_num);
214                                         break;
215                                 case IF_TYPE_SCSI:
216                                         sprintf ((char *)info->name, "sd%c%d",
217                                                 'a' + dev_desc->dev, part_num);
218                                         break;
219                                 case IF_TYPE_USB:
220                                         sprintf ((char *)info->name, "usbd%c%d",
221                                                 'a' + dev_desc->dev, part_num);
222                                         break;
223                                 case IF_TYPE_DOC:
224                                         sprintf ((char *)info->name, "docd%c%d",
225                                                 'a' + dev_desc->dev, part_num);
226                                         break;
227                                 default:
228                                         sprintf ((char *)info->name, "xx%c%d",
229                                                 'a' + dev_desc->dev, part_num);
230                                         break;
231                         }
232                         /* sprintf(info->type, "%d, pt->sys_ind); */
233                         sprintf ((char *)info->type, "U-Boot");
234                         info->bootable = is_bootable(pt);
235 #ifdef CONFIG_PARTITION_UUIDS
236                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
237 #endif
238                         return 0;
239                 }
240
241                 /* Reverse engr the fdisk part# assignment rule! */
242                 if ((ext_part_sector == 0) ||
243                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
244                         part_num++;
245                 }
246         }
247
248         /* Follows the extended partitions */
249         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
250         for (i = 0; i < 4; i++, pt++) {
251                 if (is_extended (pt->sys_ind)) {
252                         int lba_start = le32_to_int (pt->start4) + relative;
253
254                         return get_partition_info_extended (dev_desc, lba_start,
255                                  ext_part_sector == 0 ? lba_start : relative,
256                                  part_num, which_part, info, disksig);
257                 }
258         }
259
260         /* Check for DOS PBR if no partition is found */
261         dos_type = test_block_type(buffer);
262
263         if (dos_type == DOS_PBR) {
264                 info->start = 0;
265                 info->size = dev_desc->lba;
266                 info->blksz = DOS_PART_DEFAULT_SECTOR;
267                 info->bootable = 0;
268                 sprintf ((char *)info->type, "U-Boot");
269 #ifdef CONFIG_PARTITION_UUIDS
270                 info->uuid[0] = 0;
271 #endif
272                 return 0;
273         }
274
275         return -1;
276 }
277
278 void print_part_dos (block_dev_desc_t *dev_desc)
279 {
280         printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
281         print_partition_extended(dev_desc, 0, 0, 1, 0);
282 }
283
284 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
285 {
286         return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
287 }
288
289
290 #endif