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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 <memalign.h>
21 #include "part_dos.h"
22
23 #ifdef CONFIG_HAVE_BLOCK_DEVICE
24
25 #define DOS_PART_DEFAULT_SECTOR 512
26
27 /* Convert char[4] in little endian format to the host format integer
28  */
29 static inline unsigned int le32_to_int(unsigned char *le32)
30 {
31     return ((le32[3] << 24) +
32             (le32[2] << 16) +
33             (le32[1] << 8) +
34              le32[0]
35            );
36 }
37
38 static inline int is_extended(int part_type)
39 {
40     return (part_type == 0x5 ||
41             part_type == 0xf ||
42             part_type == 0x85);
43 }
44
45 static inline int is_bootable(dos_partition_t *p)
46 {
47         return (p->sys_ind == 0xef) || (p->boot_ind == 0x80);
48 }
49
50 static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
51                            int part_num, unsigned int disksig)
52 {
53         lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4);
54         lbaint_t lba_size  = le32_to_int (p->size4);
55
56         printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
57                 "u\t%08x-%02x\t%02x%s%s\n",
58                 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
59                 (is_extended(p->sys_ind) ? " Extd" : ""),
60                 (is_bootable(p) ? " Boot" : ""));
61 }
62
63 static int test_block_type(unsigned char *buffer)
64 {
65         int slot;
66         struct dos_partition *p;
67
68         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
69             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
70                 return (-1);
71         } /* no DOS Signature at all */
72         p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
73         for (slot = 0; slot < 3; slot++) {
74                 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
75                         if (!slot &&
76                             (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
77                                      "FAT", 3) == 0 ||
78                              strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
79                                      "FAT32", 5) == 0)) {
80                                 return DOS_PBR; /* is PBR */
81                         } else {
82                                 return -1;
83                         }
84                 }
85         }
86         return DOS_MBR;     /* Is MBR */
87 }
88
89
90 static int part_test_dos(struct blk_desc *dev_desc)
91 {
92 #ifndef CONFIG_SPL_BUILD
93         ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, 1);
94
95         if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
96                 return -1;
97
98         if (test_block_type((unsigned char *)mbr) != DOS_MBR)
99                 return -1;
100
101         if (dev_desc->sig_type == SIG_TYPE_NONE &&
102             mbr->unique_mbr_signature != 0) {
103                 dev_desc->sig_type = SIG_TYPE_MBR;
104                 dev_desc->mbr_sig = mbr->unique_mbr_signature;
105         }
106 #else
107         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
108
109         if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
110                 return -1;
111
112         if (test_block_type(buffer) != DOS_MBR)
113                 return -1;
114 #endif
115
116         return 0;
117 }
118
119 /*  Print a partition that is relative to its Extended partition table
120  */
121 static void print_partition_extended(struct blk_desc *dev_desc,
122                                      lbaint_t ext_part_sector,
123                                      lbaint_t relative,
124                                      int part_num, unsigned int disksig)
125 {
126         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
127         dos_partition_t *pt;
128         int i;
129
130         if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
131                 printf ("** Can't read partition table on %d:" LBAFU " **\n",
132                         dev_desc->devnum, ext_part_sector);
133                 return;
134         }
135         i=test_block_type(buffer);
136         if (i != DOS_MBR) {
137                 printf ("bad MBR sector signature 0x%02x%02x\n",
138                         buffer[DOS_PART_MAGIC_OFFSET],
139                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
140                 return;
141         }
142
143         if (!ext_part_sector)
144                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
145
146         /* Print all primary/logical partitions */
147         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
148         for (i = 0; i < 4; i++, pt++) {
149                 /*
150                  * fdisk does not show the extended partitions that
151                  * are not in the MBR
152                  */
153
154                 if ((pt->sys_ind != 0) &&
155                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
156                         print_one_part(pt, ext_part_sector, part_num, disksig);
157                 }
158
159                 /* Reverse engr the fdisk part# assignment rule! */
160                 if ((ext_part_sector == 0) ||
161                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
162                         part_num++;
163                 }
164         }
165
166         /* Follows the extended partitions */
167         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
168         for (i = 0; i < 4; i++, pt++) {
169                 if (is_extended (pt->sys_ind)) {
170                         lbaint_t lba_start
171                                 = le32_to_int (pt->start4) + relative;
172
173                         print_partition_extended(dev_desc, lba_start,
174                                 ext_part_sector == 0  ? lba_start : relative,
175                                 part_num, disksig);
176                 }
177         }
178
179         return;
180 }
181
182
183 /*  Print a partition that is relative to its Extended partition table
184  */
185 static int part_get_info_extended(struct blk_desc *dev_desc,
186                                   lbaint_t ext_part_sector, lbaint_t relative,
187                                   int part_num, int which_part,
188                                   disk_partition_t *info, unsigned int disksig)
189 {
190         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
191         dos_partition_t *pt;
192         int i;
193         int dos_type;
194
195         if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
196                 printf ("** Can't read partition table on %d:" LBAFU " **\n",
197                         dev_desc->devnum, ext_part_sector);
198                 return -1;
199         }
200         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
201                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
202                 printf ("bad MBR sector signature 0x%02x%02x\n",
203                         buffer[DOS_PART_MAGIC_OFFSET],
204                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
205                 return -1;
206         }
207
208 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
209         if (!ext_part_sector)
210                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
211 #endif
212
213         /* Print all primary/logical partitions */
214         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
215         for (i = 0; i < 4; i++, pt++) {
216                 /*
217                  * fdisk does not show the extended partitions that
218                  * are not in the MBR
219                  */
220                 if (((pt->boot_ind & ~0x80) == 0) &&
221                     (pt->sys_ind != 0) &&
222                     (part_num == which_part) &&
223                     (ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) {
224                         info->blksz = DOS_PART_DEFAULT_SECTOR;
225                         info->start = (lbaint_t)(ext_part_sector +
226                                         le32_to_int(pt->start4));
227                         info->size  = (lbaint_t)le32_to_int(pt->size4);
228                         part_set_generic_name(dev_desc, part_num,
229                                               (char *)info->name);
230                         /* sprintf(info->type, "%d, pt->sys_ind); */
231                         strcpy((char *)info->type, "U-Boot");
232                         info->bootable = is_bootable(pt);
233 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
234                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
235 #endif
236                         info->sys_ind = pt->sys_ind;
237                         return 0;
238                 }
239
240                 /* Reverse engr the fdisk part# assignment rule! */
241                 if ((ext_part_sector == 0) ||
242                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
243                         part_num++;
244                 }
245         }
246
247         /* Follows the extended partitions */
248         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
249         for (i = 0; i < 4; i++, pt++) {
250                 if (is_extended (pt->sys_ind)) {
251                         lbaint_t lba_start
252                                 = le32_to_int (pt->start4) + relative;
253
254                         return part_get_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                 strcpy((char *)info->type, "U-Boot");
269 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
270                 info->uuid[0] = 0;
271 #endif
272                 return 0;
273         }
274
275         return -1;
276 }
277
278 void part_print_dos(struct blk_desc *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 part_get_info_dos(struct blk_desc *dev_desc, int part,
285                       disk_partition_t *info)
286 {
287         return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
288 }
289
290 int is_valid_dos_buf(void *buf)
291 {
292         return test_block_type(buf) == DOS_MBR ? 0 : -1;
293 }
294
295 int write_mbr_partition(struct blk_desc *dev_desc, void *buf)
296 {
297         if (is_valid_dos_buf(buf))
298                 return -1;
299
300         /* write MBR */
301         if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
302                 printf("%s: failed writing '%s' (1 blks at 0x0)\n",
303                        __func__, "MBR");
304                 return 1;
305         }
306
307         return 0;
308 }
309
310 U_BOOT_PART_TYPE(dos) = {
311         .name           = "DOS",
312         .part_type      = PART_TYPE_DOS,
313         .max_entries    = DOS_ENTRY_NUMBERS,
314         .get_info       = part_get_info_ptr(part_get_info_dos),
315         .print          = part_print_ptr(part_print_dos),
316         .test           = part_test_dos,
317 };
318
319 #endif